Config • man page

Config (3)

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NAME

Config - access Perl configuration information

SYNOPSIS

    use Config;
    if ($Config{usethreads}) {
        print "has thread support\n"
    } 

    use Config qw(myconfig config_sh config_vars config_re);

    print myconfig();

    print config_sh();

    print config_re();

    config_vars(qw(osname archname));

DESCRIPTION

The Config module contains all the information that was available to the "Configure" program at Perl build time (over 900 values).

Shell variables from the config.sh file (written by Configure) are stored in the readonly-variable %Config, indexed by their names.

Values stored in config.sh as 'undef' are returned as undefined values. The perl "exists" function can be used to check if a named variable exists.

For a description of the variables, please have a look at the Glossary file, as written in the Porting folder, or use the url: perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary

myconfig()

Returns a textual summary of the major perl configuration values. See also "-V" in ``Command Switches'' in perlrun.

config_sh()

Returns the entire perl configuration information in the form of the original config.sh shell variable assignment script.

config_re($regex)

Like config_sh() but returns, as a list, only the config entries who's names match the $regex.

config_vars(@names)

Prints to

STDOUT

the values of the named configuration variable. Each is printed on a separate line in the form:

  name='value';

Names which are unknown are output as "name='UNKNOWN';". See also "-V:name" in ``Command Switches'' in perlrun.

bincompat_options()

Returns a list of C pre-processor options used when compiling this perl binary, which affect its binary compatibility with extensions. "bincompat_options()" and "non_bincompat_options()" are shown together in the output of "perl -V" as Compile-time options.

non_bincompat_options()

Returns a list of C pre-processor options used when compiling this perl binary, which do not affect binary compatibility with extensions.

compile_date()

Returns the compile date (as a string), equivalent to what is shown by "perl -V"

local_patches()

Returns a list of the names of locally applied patches, equivalent to what is shown by "perl -V".

header_files()

Returns a list of the header files that should be used as dependencies for

code, for this version of Perl on this platform.

EXAMPLE

Here's a more sophisticated example of using %Config:

    use Config;
    use strict;

    my %sig_num;
    my @sig_name;
    unless($Config{sig_name} && $Config{sig_num}) {
        die "No sigs?";
    } else {
        my @names = split ' ', $Config{sig_name};
        @sig_num{@names} = split ' ', $Config{sig_num};
        foreach (@names) {
            $sig_name[$sig_num{$_}] ||= $_;
        }   
    }

    print "signal #17 = $sig_name[17]\n";
    if ($sig_num{ALRM}) { 
        print "SIGALRM is $sig_num{ALRM}\n";
    }

WARNING

Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it.

The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) and it checks the perl version number when loaded.

The values stored in config.sh may be either single-quoted or double-quoted. Double-quoted strings are handy for those cases where you need to include escape sequences in the strings. To avoid runtime variable interpolation, any "$" and "@" characters are replaced by "\$" and "\@", respectively. This isn't foolproof, of course, so don't embed "\$" or "\@" in double-quoted strings unless you're willing to deal with the consequences. (The slashes will end up escaped and the "$" or "@" will trigger variable interpolation)

GLOSSARY

Most "Config" variables are determined by the "Configure" script on platforms supported by it (which is most

UNIX

platforms). Some platforms have custom-made "Config" variables, and may thus not have some of the variables described below, or may have extraneous variables specific to that particular port. See the port specific documentation in such cases.

_

_a: From Unix.U:
This variable defines the extension used for ordinary library files. For unix, it is .a. The . is included. Other possible values include .lib.
_exe: From Unix.U:
This variable defines the extension used for executable files. "DJGPP", Cygwin and
OS/2
use .exe. Stratus "VOS" uses .pm. On operating systems which do not require a specific extension for executable files, this variable is empty.
_o: From Unix.U:
This variable defines the extension used for object files. For unix, it is .o. The . is included. Other possible values include .obj.

a

afs

From afs.U:

This variable is set to "true" if "AFS" (Andrew File System) is used on the system, "false" otherwise. It is possible to override this with a hint value or command line option, but you'd better know what you are doing.

afsroot

From afs.U:

This variable is by default set to /afs. In the unlikely case this is not the correct root, it is possible to override this with a hint value or command line option. This will be used in subsequent tests for AFSness in the configure and test process.

alignbytes

From alignbytes.U:

This variable holds the number of bytes required to align a double--- or a long double when applicable. Usual values are 2, 4 and 8. The default is eight, for safety.

ansi2knr

From ansi2knr.U:

This variable is set if the user needs to run ansi2knr. Currently, this is not supported, so we just abort.

aphostname

From d_gethname.U:

This variable contains the command which can be used to compute the host name. The command is fully qualified by its absolute path, to make it safe when used by a process with super-user privileges.

api_revision

From patchlevel.U:

The three variables, api_revision, api_version, and api_subversion, specify the version of the oldest perl binary compatible with the present perl. In a full version string such as 5.6.1, api_revision is the 5. Prior to 5.5.640, the format was a floating point number, like 5.00563.

perl.c:incpush() and lib/lib.pm will automatically search in $sitelib/.. for older directories back to the limit specified by these api_ variables. This is only useful if you have a perl library directory tree structured like the default one. See "INSTALL" for how this works. The versioned site_perl directory was introduced in 5.005, so that is the lowest possible value. The version list appropriate for the current system is determined in inc_version_list.U.

"XXX" To do: Since compatibility can depend on compile time options (such as bincompat, longlong, etc.) it should (perhaps) be set by Configure, but currently it isn't. Currently, we read a hard-wired value from patchlevel.h. Perhaps what we ought to do is take the hard-wired value from patchlevel.h but then modify it if the current Configure options warrant. patchlevel.h then would use an #ifdef guard.

api_subversion

From patchlevel.U:

api_version

From patchlevel.U:

The three variables, api_revision, api_version, and api_subversion, specify the version of the oldest perl binary compatible with the present perl. In a full version string such as 5.6.1, api_version is the 6. See api_revision for full details. As a special case, 5.5.0 is rendered in the old-style as 5.005. (In the 5.005_0x maintenance series, this was the only versioned directory in $sitelib.)

api_versionstring

From patchlevel.U:

This variable combines api_revision, api_version, and api_subversion in a format such as 5.6.1 (or 5_6_1) suitable for use as a directory name. This is filesystem dependent.

ar

From Loc.U:

This variable is used internally by Configure to determine the full pathname (if any) of the ar program. After Configure runs, the value is reset to a plain "ar" and is not useful.

archlib

From archlib.U:

This variable holds the name of the directory in which the user wants to put architecture-dependent public library files for $package. It is most often a local directory such as /usr/local/lib. Programs using this variable must be prepared to deal with filename expansion.

archlibexp

From archlib.U:

This variable is the same as the archlib variable, but is filename expanded at configuration time, for convenient use.

archname

From archname.U:

This variable is a short name to characterize the current architecture. It is used mainly to construct the default archlib.

archname64

From use64bits.U:

This variable is used for the 64-bitness part of $archname.

archobjs

From Unix.U:

This variable defines any additional objects that must be linked in with the program on this architecture. On unix, it is usually empty. It is typically used to include emulations of unix calls or other facilities. For perl on

OS/2

, for example, this would include os2/os2.obj.

asctime_r_proto

From d_asctime_r.U:

This variable encodes the prototype of asctime_r. It is zero if d_asctime_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_asctime_r is defined.

awk

From Loc.U:

This variable is used internally by Configure to determine the full pathname (if any) of the awk program. After Configure runs, the value is reset to a plain "awk" and is not useful.

b

baserev: From baserev.U:
The base revision level of this package, from the .package file.
bash: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
bin: From bin.U:
This variable holds the name of the directory in which the user wants to put publicly executable images for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution.
bin_ELF: From dlsrc.U:
This variable saves the result from configure if generated binaries are in "ELF" format. Only set to defined when the test has actually been performed, and the result was positive.
binexp: From bin.U:
This is the same as the bin variable, but is filename expanded at configuration time, for use in your makefiles.
bison: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the bison program. After Configure runs, the value is reset to a plain "bison" and is not useful.
byacc: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the byacc program. After Configure runs, the value is reset to a plain "byacc" and is not useful.
byteorder: From byteorder.U:
This variable holds the byte order in a "UV". In the following, larger digits indicate more significance. The variable byteorder is either 4321 on a big-endian machine, or 1234 on a little-endian, or 87654321 on a Cray ... or 3412 with weird order !

c

c: From n.U:
This variable contains the \c string if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is $echo $n ``prompt for a question: $c''.
castflags: From d_castneg.U:
This variable contains a flag that precise difficulties the compiler has casting odd floating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >= 0x80000000 4 = couldn't cast in argument expression list
cat: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the cat program. After Configure runs, the value is reset to a plain "cat" and is not useful.
cc: From cc.U:
This variable holds the name of a command to execute a C compiler which can resolve multiple global references that happen to have the same name. Usual values are "cc" and "gcc". Fervent "ANSI" compilers may be called "c89". "AIX" has xlc.
cccdlflags: From dlsrc.U:
This variable contains any special flags that might need to be passed with "cc -c" to compile modules to be used to create a shared library that will be used for dynamic loading. For hpux, this should be +z. It is up to the makefile to use it.
ccdlflags: From dlsrc.U:
This variable contains any special flags that might need to be passed to cc to link with a shared library for dynamic loading. It is up to the makefile to use it. For sunos 4.1, it should be empty.
ccflags: From ccflags.U:
This variable contains any additional C compiler flags desired by the user. It is up to the Makefile to use this.
ccflags_uselargefiles: From uselfs.U:
This variable contains the compiler flags needed by large file builds and added to ccflags by hints files.
ccname: From Checkcc.U:
This can set either by hints files or by Configure. If using gcc, this is gcc, and if not, usually equal to cc, unimpressive, no? Some platforms, however, make good use of this by storing the flavor of the C compiler being used here. For example if using the Sun WorkShop suite, ccname will be "workshop".
ccsymbols: From Cppsym.U:
The variable contains the symbols defined by the C compiler alone. The symbols defined by cpp or by cc when it calls cpp are not in this list, see cppsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens.
ccversion: From Checkcc.U:
This can set either by hints files or by Configure. If using a (non-gcc) vendor cc, this variable may contain a version for the compiler.
cf_by: From cf_who.U:
Login name of the person who ran the Configure script and answered the questions. This is used to tag both config.sh and config_h.SH.
cf_email: From cf_email.U:
Electronic mail address of the person who ran Configure. This can be used by units that require the user's e-mail, like MailList.U.
cf_time: From cf_who.U:
Holds the output of the "date" command when the configuration file was produced. This is used to tag both config.sh and config_h.SH.
charbits: From charsize.U:
This variable contains the value of the "CHARBITS" symbol, which indicates to the C program how many bits there are in a character.
charsize: From charsize.U:
This variable contains the value of the "CHARSIZE" symbol, which indicates to the C program how many bytes there are in a character.
chgrp: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
chmod: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the chmod program. After Configure runs, the value is reset to a plain "chmod" and is not useful.
chown: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
clocktype: From d_times.U:
This variable holds the type returned by times(). It can be long, or clock_t on "BSD" sites (in which case <sys/types.h> should be included).
comm: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the comm program. After Configure runs, the value is reset to a plain "comm" and is not useful.
compress: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
config_arg0: From Options.U:
This variable contains the string used to invoke the Configure command, as reported by the shell in the $0 variable.
config_argc: From Options.U:
This variable contains the number of command-line arguments passed to Configure, as reported by the shell in the $# variable. The individual arguments are stored as variables config_arg1, config_arg2, etc.
config_args: From Options.U:
This variable contains a single string giving the command-line arguments passed to Configure. Spaces within arguments,
quotes, and escaped characters are not correctly preserved. To reconstruct the command line, you must assemble the individual command line pieces, given in config_arg[0-9]*.
contains: From contains.U:
This variable holds the command to do a grep with a proper return status. On most sane systems it is simply "grep". On insane systems it is a grep followed by a cat followed by a test. This variable is primarily for the use of other Configure units.
cp: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the cp program. After Configure runs, the value is reset to a plain "cp" and is not useful.
cpio: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
cpp: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the cpp program. After Configure runs, the value is reset to a plain "cpp" and is not useful.
cpp_stuff: From cpp_stuff.U:
This variable contains an identification of the concatenation mechanism used by the C preprocessor.
cppccsymbols: From Cppsym.U:
The variable contains the symbols defined by the C compiler when it calls cpp. The symbols defined by the cc alone or cpp alone are not in this list, see ccsymbols and cppsymbols. The list is a space-separated list of symbol=value tokens.
cppflags: From ccflags.U:
This variable holds the flags that will be passed to the C pre- processor. It is up to the Makefile to use it.
cpplast: From cppstdin.U:
This variable has the same functionality as cppminus, only it applies to cpprun and not cppstdin.
cppminus: From cppstdin.U:
This variable contains the second part of the string which will invoke the C preprocessor on the standard input and produce to standard output. This variable will have the value "-" if cppstdin needs a minus to specify standard input, otherwise the value is "".
cpprun: From cppstdin.U:
This variable contains the command which will invoke a C preprocessor on standard input and put the output to stdout. It is guaranteed not to be a wrapper and may be a null string if no preprocessor can be made directly available. This preprocessor might be different from the one used by the C compiler. Don't forget to append cpplast after the preprocessor options.
cppstdin: From cppstdin.U:
This variable contains the command which will invoke the C preprocessor on standard input and put the output to stdout. It is primarily used by other Configure units that ask about preprocessor symbols.
cppsymbols: From Cppsym.U:
The variable contains the symbols defined by the C preprocessor alone. The symbols defined by cc or by cc when it calls cpp are not in this list, see ccsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens.
crypt_r_proto: From d_crypt_r.U:
This variable encodes the prototype of crypt_r. It is zero if d_crypt_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_crypt_r is defined.
cryptlib: From d_crypt.U:
This variable holds -lcrypt or the path to a libcrypt.a archive if the crypt() function is not defined in the standard C library. It is up to the Makefile to use this.
csh: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the csh program. After Configure runs, the value is reset to a plain "csh" and is not useful.
ctermid_r_proto: From d_ctermid_r.U:
This variable encodes the prototype of ctermid_r. It is zero if d_ctermid_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ctermid_r is defined.
ctime_r_proto: From d_ctime_r.U:
This variable encodes the prototype of ctime_r. It is zero if d_ctime_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ctime_r is defined.

d

d__fwalk

From d__fwalk.U:

This variable conditionally defines "HAS__FWALK" if _fwalk() is available to apply a function to all the file handles.

d_access

From d_access.U:

This variable conditionally defines "HAS_ACCESS" if the access() system call is available to check for access permissions using real IDs.

d_accessx

From d_accessx.U:

This variable conditionally defines the "HAS_ACCESSX" symbol, which indicates to the C program that the accessx() routine is available.

d_acosh

From d_acosh.U:

This variable conditionally defines the "HAS_ACOSH" symbol, which indicates to the C program that the acosh() routine is available.

d_aintl

From d_aintl.U:

This variable conditionally defines the "HAS_AINTL" symbol, which indicates to the C program that the aintl() routine is available. If copysignl is also present we can emulate modfl.

d_alarm

From d_alarm.U:

This variable conditionally defines the "HAS_ALARM" symbol, which indicates to the C program that the alarm() routine is available.

d_archlib

From archlib.U:

This variable conditionally defines "ARCHLIB" to hold the pathname of architecture-dependent library files for $package. If $archlib is the same as $privlib, then this is set to undef.

d_asctime64

From d_timefuncs64.U:

This variable conditionally defines the

HAS_ASCTIME64

symbol, which indicates to the C program that the asctime64 () routine is available.

d_asctime_r

From d_asctime_r.U:

This variable conditionally defines the "HAS_ASCTIME_R" symbol, which indicates to the C program that the asctime_r() routine is available.

d_asinh

From d_asinh.U:

This variable conditionally defines the "HAS_ASINH" symbol, which indicates to the C program that the asinh() routine is available.

d_atanh

From d_atanh.U:

This variable conditionally defines the "HAS_ATANH" symbol, which indicates to the C program that the atanh() routine is available.

d_atolf

From atolf.U:

This variable conditionally defines the "HAS_ATOLF" symbol, which indicates to the C program that the atolf() routine is available.

d_atoll

From atoll.U:

This variable conditionally defines the "HAS_ATOLL" symbol, which indicates to the C program that the atoll() routine is available.

d_attribute_deprecated

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_DEPRECATED", which indicates that "GCC" can handle the attribute for marking deprecated APIs

d_attribute_format

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_FORMAT", which indicates the C compiler can check for printf-like formats.

d_attribute_malloc

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_MALLOC", which indicates the C compiler can understand functions as having malloc-like semantics.

d_attribute_nonnull

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_NONNULL", which indicates that the C compiler can know that certain arguments must not be "NULL", and will check accordingly at compile time.

d_attribute_noreturn

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_NORETURN", which indicates that the C compiler can know that certain functions are guaranteed never to return.

d_attribute_pure

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_PURE", which indicates that the C compiler can know that certain functions are "pure" functions, meaning that they have no side effects, and only rely on function input and/or global data for their results.

d_attribute_unused

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_UNUSED", which indicates that the C compiler can know that certain variables and arguments may not always be used, and to not throw warnings if they don't get used.

d_attribute_warn_unused_result

From d_attribut.U:

This variable conditionally defines "HASATTRIBUTE_WARN_UNUSED_RESULT", which indicates that the C compiler can know that certain functions have a return values that must not be ignored, such as malloc() or open().

d_backtrace

From d_backtrace.U:

This variable conditionally defines the "HAS_BACKTRACE" symbol, which indicates to the C program that the backtrace() routine is available to get a stack trace.

d_bcmp

From d_bcmp.U:

This variable conditionally defines the "HAS_BCMP" symbol if the bcmp() routine is available to compare strings.

d_bcopy

From d_bcopy.U:

This variable conditionally defines the "HAS_BCOPY" symbol if the bcopy() routine is available to copy strings.

d_bsd

From Guess.U:

This symbol conditionally defines the symbol "BSD" when running on a "BSD" system.

d_bsdgetpgrp

From d_getpgrp.U:

This variable conditionally defines "USE_BSD_GETPGRP" if getpgrp needs one arguments whereas "USG" one needs none.

d_bsdsetpgrp

From d_setpgrp.U:

This variable conditionally defines "USE_BSD_SETPGRP" if setpgrp needs two arguments whereas "USG" one needs none. See also d_setpgid for a "POSIX" interface.

d_builtin_choose_expr

From d_builtin.U:

This conditionally defines "HAS_BUILTIN_CHOOSE_EXPR", which indicates that the compiler supports __builtin_choose_expr(x,y,z). This built-in function is analogous to the "x?y:z" operator in C, except that the expression returned has its type unaltered by promotion rules. Also, the built-in function does not evaluate the expression that was not chosen.

d_builtin_expect

From d_builtin.U:

This conditionally defines "HAS_BUILTIN_EXPECT", which indicates that the compiler supports __builtin_expect(exp,c). You may use __builtin_expect to provide the compiler with branch prediction information.

d_bzero

From d_bzero.U:

This variable conditionally defines the "HAS_BZERO" symbol if the bzero() routine is available to set memory to 0.

d_c99_variadic_macros

From d_c99_variadic.U:

This variable conditionally defines the

HAS_C99_VARIADIC_MACROS

symbol, which indicates to the C program that C99 variadic macros are available.

d_casti32

From d_casti32.U:

This variable conditionally defines

CASTI32,

which indicates whether the C compiler can cast large floats to 32-bit ints.

d_castneg

From d_castneg.U:

This variable conditionally defines "CASTNEG", which indicates whether the C compiler can cast negative float to unsigned.

d_cbrt

From d_cbrt.U:

This variable conditionally defines the "HAS_CBRT" symbol, which indicates to the C program that the cbrt() (cube root) function is available.

d_charvspr

From d_vprintf.U:

This variable conditionally defines "CHARVSPRINTF" if this system has vsprintf returning type (char*). The trend seems to be to declare it as ``int vsprintf()''.

d_chown

From d_chown.U:

This variable conditionally defines the "HAS_CHOWN" symbol, which indicates to the C program that the chown() routine is available.

d_chroot

From d_chroot.U:

This variable conditionally defines the "HAS_CHROOT" symbol, which indicates to the C program that the chroot() routine is available.

d_chsize

From d_chsize.U:

This variable conditionally defines the "CHSIZE" symbol, which indicates to the C program that the chsize() routine is available to truncate files. You might need a -lx to get this routine.

d_class

From d_class.U:

This variable conditionally defines the "HAS_CLASS" symbol, which indicates to the C program that the class() routine is available.

d_clearenv

From d_clearenv.U:

This variable conditionally defines the "HAS_CLEARENV" symbol, which indicates to the C program that the clearenv () routine is available.

d_closedir

From d_closedir.U:

This variable conditionally defines "HAS_CLOSEDIR" if closedir() is available.

d_cmsghdr_s

From d_cmsghdr_s.U:

This variable conditionally defines the "HAS_STRUCT_CMSGHDR" symbol, which indicates that the struct cmsghdr is supported.

d_const

From d_const.U:

This variable conditionally defines the "HASCONST" symbol, which indicates to the C program that this C compiler knows about the const type.

d_copysign

From d_copysign.U:

This variable conditionally defines the "HAS_COPYSIGN" symbol, which indicates to the C program that the copysign() routine is available.

d_copysignl

From d_copysignl.U:

This variable conditionally defines the "HAS_COPYSIGNL" symbol, which indicates to the C program that the copysignl() routine is available. If aintl is also present we can emulate modfl.

d_cplusplus

From d_cplusplus.U:

This variable conditionally defines the "USE_CPLUSPLUS" symbol, which indicates that a C

compiler was used to compiled Perl and will be used to compile extensions.

d_crypt

From d_crypt.U:

This variable conditionally defines the "CRYPT" symbol, which indicates to the C program that the crypt() routine is available to encrypt passwords and the like.

d_crypt_r

From d_crypt_r.U:

This variable conditionally defines the "HAS_CRYPT_R" symbol, which indicates to the C program that the crypt_r() routine is available.

d_csh

From d_csh.U:

This variable conditionally defines the "CSH" symbol, which indicates to the C program that the C-shell exists.

d_ctermid

From d_ctermid.U:

This variable conditionally defines "CTERMID" if ctermid() is available to generate filename for terminal.

d_ctermid_r

From d_ctermid_r.U:

This variable conditionally defines the "HAS_CTERMID_R" symbol, which indicates to the C program that the ctermid_r() routine is available.

d_ctime64

From d_timefuncs64.U:

This variable conditionally defines the

HAS_CTIME64

symbol, which indicates to the C program that the ctime64 () routine is available.

d_ctime_r

From d_ctime_r.U:

This variable conditionally defines the "HAS_CTIME_R" symbol, which indicates to the C program that the ctime_r() routine is available.

d_cuserid

From d_cuserid.U:

This variable conditionally defines the "HAS_CUSERID" symbol, which indicates to the C program that the cuserid() routine is available to get character login names.

d_dbl_dig

From d_dbl_dig.U:

This variable conditionally defines d_dbl_dig if this system's header files provide "DBL_DIG", which is the number of significant digits in a double precision number.

d_dbminitproto

From d_dbminitproto.U:

This variable conditionally defines the "HAS_DBMINIT_PROTO" symbol, which indicates to the C program that the system provides a prototype for the dbminit() function. Otherwise, it is up to the program to supply one.

d_difftime

From d_difftime.U:

This variable conditionally defines the "HAS_DIFFTIME" symbol, which indicates to the C program that the difftime() routine is available.

d_difftime64

From d_timefuncs64.U:

This variable conditionally defines the

HAS_DIFFTIME64

symbol, which indicates to the C program that the difftime64 () routine is available.

d_dir_dd_fd

From d_dir_dd_fd.U:

This variable conditionally defines the "HAS_DIR_DD_FD" symbol, which indicates that the "DIR" directory stream type contains a member variable called dd_fd.

d_dirfd

From d_dirfd.U:

This variable conditionally defines the "HAS_DIRFD" constant, which indicates to the C program that dirfd() is available to return the file descriptor of a directory stream.

d_dirnamlen

From i_dirent.U:

This variable conditionally defines "DIRNAMLEN", which indicates to the C program that the length of directory entry names is provided by a d_namelen field.

d_dladdr

From d_dladdr.U:

This variable conditionally defines the "HAS_DLADDR" symbol, which indicates to the C program that the dladdr() routine is available to get a stack trace.

d_dlerror

From d_dlerror.U:

This variable conditionally defines the "HAS_DLERROR" symbol, which indicates to the C program that the dlerror() routine is available.

d_dlopen

From d_dlopen.U:

This variable conditionally defines the "HAS_DLOPEN" symbol, which indicates to the C program that the dlopen() routine is available.

d_dlsymun

From d_dlsymun.U:

This variable conditionally defines "DLSYM_NEEDS_UNDERSCORE", which indicates that we need to prepend an underscore to the symbol name before calling dlsym().

d_dosuid

From d_dosuid.U:

This variable conditionally defines the symbol "DOSUID", which tells the C program that it should insert setuid emulation code on hosts which have setuid #! scripts disabled.

d_drand48_r

From d_drand48_r.U:

This variable conditionally defines the

HAS_DRAND48_R

symbol, which indicates to the C program that the drand48_r() routine is available.

d_drand48proto

From d_drand48proto.U:

This variable conditionally defines the

HAS_DRAND48_PROTO

symbol, which indicates to the C program that the system provides a prototype for the drand48() function. Otherwise, it is up to the program to supply one.

d_dup2

From d_dup2.U:

This variable conditionally defines

HAS_DUP2

if dup2() is available to duplicate file descriptors.

d_eaccess

From d_eaccess.U:

This variable conditionally defines the "HAS_EACCESS" symbol, which indicates to the C program that the eaccess() routine is available.

d_endgrent

From d_endgrent.U:

This variable conditionally defines the "HAS_ENDGRENT" symbol, which indicates to the C program that the endgrent() routine is available for sequential access of the group database.

d_endgrent_r

From d_endgrent_r.U:

This variable conditionally defines the "HAS_ENDGRENT_R" symbol, which indicates to the C program that the endgrent_r() routine is available.

d_endhent

From d_endhent.U:

This variable conditionally defines "HAS_ENDHOSTENT" if endhostent() is available to close whatever was being used for host queries.

d_endhostent_r

From d_endhostent_r.U:

This variable conditionally defines the "HAS_ENDHOSTENT_R" symbol, which indicates to the C program that the endhostent_r() routine is available.

d_endnent

From d_endnent.U:

This variable conditionally defines "HAS_ENDNETENT" if endnetent() is available to close whatever was being used for network queries.

d_endnetent_r

From d_endnetent_r.U:

This variable conditionally defines the "HAS_ENDNETENT_R" symbol, which indicates to the C program that the endnetent_r() routine is available.

d_endpent

From d_endpent.U:

This variable conditionally defines "HAS_ENDPROTOENT" if endprotoent() is available to close whatever was being used for protocol queries.

d_endprotoent_r

From d_endprotoent_r.U:

This variable conditionally defines the "HAS_ENDPROTOENT_R" symbol, which indicates to the C program that the endprotoent_r() routine is available.

d_endpwent

From d_endpwent.U:

This variable conditionally defines the "HAS_ENDPWENT" symbol, which indicates to the C program that the endpwent() routine is available for sequential access of the passwd database.

d_endpwent_r

From d_endpwent_r.U:

This variable conditionally defines the "HAS_ENDPWENT_R" symbol, which indicates to the C program that the endpwent_r() routine is available.

d_endsent

From d_endsent.U:

This variable conditionally defines "HAS_ENDSERVENT" if endservent() is available to close whatever was being used for service queries.

d_endservent_r

From d_endservent_r.U:

This variable conditionally defines the "HAS_ENDSERVENT_R" symbol, which indicates to the C program that the endservent_r() routine is available.

d_eofnblk

From nblock_io.U:

This variable conditionally defines "EOF_NONBLOCK" if "EOF" can be seen when reading from a non-blocking I/O source.

d_erf

From d_erf.U:

This variable conditionally defines the "HAS_ERF" symbol, which indicates to the C program that the erf() routine is available.

d_erfc

From d_erfc.U:

This variable conditionally defines the "HAS_ERFC" symbol, which indicates to the C program that the erfc() routine is available.

d_eunice

From Guess.U:

This variable conditionally defines the symbols "EUNICE" and "VAX", which alerts the C program that it must deal with idiosyncrasies of "VMS".

d_exp2

From d_exp2.U:

This variable conditionally defines the

HAS_EXP2

symbol, which indicates to the C program that the exp2() routine is available.

d_expm1

From d_expm1.U:

This variable conditionally defines the

HAS_EXPM1

symbol, which indicates to the C program that the expm1() routine is available.

d_faststdio

From d_faststdio.U:

This variable conditionally defines the "HAS_FAST_STDIO" symbol, which indicates to the C program that the ``fast stdio'' is available to manipulate the stdio buffers directly.

d_fchdir

From d_fchdir.U:

This variable conditionally defines the "HAS_FCHDIR" symbol, which indicates to the C program that the fchdir() routine is available.

d_fchmod

From d_fchmod.U:

This variable conditionally defines the "HAS_FCHMOD" symbol, which indicates to the C program that the fchmod() routine is available to change mode of opened files.

d_fchown

From d_fchown.U:

This variable conditionally defines the "HAS_FCHOWN" symbol, which indicates to the C program that the fchown() routine is available to change ownership of opened files.

d_fcntl

From d_fcntl.U:

This variable conditionally defines the "HAS_FCNTL" symbol, and indicates whether the fcntl() function exists

d_fcntl_can_lock

From d_fcntl_can_lock.U:

This variable conditionally defines the "FCNTL_CAN_LOCK" symbol and indicates whether file locking with fcntl() works.

d_fd_macros

From d_fd_set.U:

This variable contains the eventual value of the "HAS_FD_MACROS" symbol, which indicates if your C compiler knows about the macros which manipulate an fd_set.

d_fd_set

From d_fd_set.U:

This variable contains the eventual value of the "HAS_FD_SET" symbol, which indicates if your C compiler knows about the fd_set typedef.

d_fdim

From d_fdim.U:

This variable conditionally defines the "HAS_FDIM" symbol, which indicates to the C program that the fdim() routine is available.

d_fds_bits

From d_fd_set.U:

This variable contains the eventual value of the "HAS_FDS_BITS" symbol, which indicates if your fd_set typedef contains the fds_bits member. If you have an fd_set typedef, but the dweebs who installed it did a half-fast job and neglected to provide the macros to manipulate an fd_set, "HAS_FDS_BITS" will let us know how to fix the gaffe.

d_fegetround

From d_fegetround.U:

This variable conditionally defines "HAS_FEGETROUND" if fegetround() is available to get the floating point rounding mode.

d_fgetpos

From d_fgetpos.U:

This variable conditionally defines "HAS_FGETPOS" if fgetpos() is available to get the file position indicator.

d_finite

From d_finite.U:

This variable conditionally defines the "HAS_FINITE" symbol, which indicates to the C program that the finite() routine is available.

d_finitel

From d_finitel.U:

This variable conditionally defines the "HAS_FINITEL" symbol, which indicates to the C program that the finitel() routine is available.

d_flexfnam

From d_flexfnam.U:

This variable conditionally defines the "FLEXFILENAMES" symbol, which indicates that the system supports filenames longer than 14 characters.

d_flock

From d_flock.U:

This variable conditionally defines "HAS_FLOCK" if flock() is available to do file locking.

d_flockproto

From d_flockproto.U:

This variable conditionally defines the "HAS_FLOCK_PROTO" symbol, which indicates to the C program that the system provides a prototype for the flock() function. Otherwise, it is up to the program to supply one.

d_fma

From d_fma.U:

This variable conditionally defines the "HAS_FMA" symbol, which indicates to the C program that the fma() routine is available.

d_fmax

From d_fmax.U:

This variable conditionally defines the "HAS_FMAX" symbol, which indicates to the C program that the fmax() routine is available.

d_fmin

From d_fmin.U:

This variable conditionally defines the "HAS_FMIN" symbol, which indicates to the C program that the fmin() routine is available.

d_fork

From d_fork.U:

This variable conditionally defines the "HAS_FORK" symbol, which indicates to the C program that the fork() routine is available.

d_fp_class

From d_fp_class.U:

This variable conditionally defines the "HAS_FP_CLASS" symbol, which indicates to the C program that the fp_class() routine is available.

d_fp_classify

From d_fpclassify.U:

This variable conditionally defines the "HAS_FP_CLASSIFY" symbol, which indicates to the C program that the fp_classify() routine is available.

d_fp_classl

From d_fp_classl.U:

This variable conditionally defines the "HAS_FP_CLASSL" symbol, which indicates to the C program that the fp_classl() routine is available.

d_fpathconf

From d_pathconf.U:

This variable conditionally defines the "HAS_FPATHCONF" symbol, which indicates to the C program that the pathconf() routine is available to determine file-system related limits and options associated with a given open file descriptor.

d_fpclass

From d_fpclass.U:

This variable conditionally defines the "HAS_FPCLASS" symbol, which indicates to the C program that the fpclass() routine is available.

d_fpclassify

From d_fpclassify.U:

This variable conditionally defines the "HAS_FPCLASSIFY" symbol, which indicates to the C program that the fpclassify() routine is available.

d_fpclassl

From d_fpclassl.U:

This variable conditionally defines the "HAS_FPCLASSL" symbol, which indicates to the C program that the fpclassl() routine is available.

d_fpgetround

From d_fpgetround.U:

This variable conditionally defines "HAS_FPGETROUND" if fpgetround() is available to get the floating point rounding mode.

d_fpos64_t

From d_fpos64_t.U:

This symbol will be defined if the C compiler supports fpos64_t.

d_frexpl

From d_frexpl.U:

This variable conditionally defines the "HAS_FREXPL" symbol, which indicates to the C program that the frexpl() routine is available.

d_fs_data_s

From d_fs_data_s.U:

This variable conditionally defines the "HAS_STRUCT_FS_DATA" symbol, which indicates that the struct fs_data is supported.

d_fseeko

From d_fseeko.U:

This variable conditionally defines the "HAS_FSEEKO" symbol, which indicates to the C program that the fseeko() routine is available.

d_fsetpos

From d_fsetpos.U:

This variable conditionally defines "HAS_FSETPOS" if fsetpos() is available to set the file position indicator.

d_fstatfs

From d_fstatfs.U:

This variable conditionally defines the "HAS_FSTATFS" symbol, which indicates to the C program that the fstatfs() routine is available.

d_fstatvfs

From d_statvfs.U:

This variable conditionally defines the "HAS_FSTATVFS" symbol, which indicates to the C program that the fstatvfs() routine is available.

d_fsync

From d_fsync.U:

This variable conditionally defines the "HAS_FSYNC" symbol, which indicates to the C program that the fsync() routine is available.

d_ftello

From d_ftello.U:

This variable conditionally defines the "HAS_FTELLO" symbol, which indicates to the C program that the ftello() routine is available.

d_ftime

From d_ftime.U:

This variable conditionally defines the "HAS_FTIME" symbol, which indicates that the ftime() routine exists. The ftime() routine is basically a sub-second accuracy clock.

d_futimes

From d_futimes.U:

This variable conditionally defines the "HAS_FUTIMES" symbol, which indicates to the C program that the futimes() routine is available.

d_Gconvert

From d_gconvert.U:

This variable holds what Gconvert is defined as to convert floating point numbers into strings. By default, Configure sets "this" macro to use the first of gconvert, gcvt, or sprintf that pass sprintf-%g-like behavior tests. If perl is using long doubles, the macro uses the first of the following functions that pass Configure's tests: qgcvt, sprintf (if Configure knows how to make sprintf format long doubles---see sPRIgldbl), gconvert, gcvt, and sprintf (casting to double). The gconvert_preference and gconvert_ld_preference variables can be used to alter Configure's preferences, for doubles and long doubles, respectively. If present, they contain a space-separated list of one or more of the above function names in the order they should be tried.

d_Gconvert may be set to override Configure with a platform- specific function. If this function expects a double, a different value may need to be set by the uselongdouble.cbu call-back unit so that long doubles can be formatted without loss of precision.

d_gdbm_ndbm_h_uses_prototypes

From i_ndbm.U:

This variable conditionally defines the "NDBM_H_USES_PROTOTYPES" symbol, which indicates that the gdbm-ndbm.h include file uses real "ANSI" C prototypes instead of K&R style function declarations. K&R style declarations are unsupported in C

, so the include file requires special handling when using a C

compiler and this variable is undefined. Consult the different d_*ndbm_h_uses_prototypes variables to get the same information for alternative ndbm.h include files.

d_gdbmndbm_h_uses_prototypes

From i_ndbm.U:

This variable conditionally defines the "NDBM_H_USES_PROTOTYPES" symbol, which indicates that the gdbm/ndbm.h include file uses real "ANSI" C prototypes instead of K&R style function declarations. K&R style declarations are unsupported in C

, so the include file requires special handling when using a C

compiler and this variable is undefined. Consult the different d_*ndbm_h_uses_prototypes variables to get the same information for alternative ndbm.h include files.

d_getaddrinfo

From d_getaddrinfo.U:

This variable conditionally defines the "HAS_GETADDRINFO" symbol, which indicates to the C program that the getaddrinfo() function is available.

d_getcwd

From d_getcwd.U:

This variable conditionally defines the "HAS_GETCWD" symbol, which indicates to the C program that the getcwd() routine is available to get the current working directory.

d_getespwnam

From d_getespwnam.U:

This variable conditionally defines "HAS_GETESPWNAM" if getespwnam() is available to retrieve enhanced (shadow) password entries by name.

d_getfsstat

From d_getfsstat.U:

This variable conditionally defines the "HAS_GETFSSTAT" symbol, which indicates to the C program that the getfsstat() routine is available.

d_getgrent

From d_getgrent.U:

This variable conditionally defines the "HAS_GETGRENT" symbol, which indicates to the C program that the getgrent() routine is available for sequential access of the group database.

d_getgrent_r

From d_getgrent_r.U:

This variable conditionally defines the "HAS_GETGRENT_R" symbol, which indicates to the C program that the getgrent_r() routine is available.

d_getgrgid_r

From d_getgrgid_r.U:

This variable conditionally defines the "HAS_GETGRGID_R" symbol, which indicates to the C program that the getgrgid_r() routine is available.

d_getgrnam_r

From d_getgrnam_r.U:

This variable conditionally defines the "HAS_GETGRNAM_R" symbol, which indicates to the C program that the getgrnam_r() routine is available.

d_getgrps

From d_getgrps.U:

This variable conditionally defines the "HAS_GETGROUPS" symbol, which indicates to the C program that the getgroups() routine is available to get the list of process groups.

d_gethbyaddr

From d_gethbyad.U:

This variable conditionally defines the "HAS_GETHOSTBYADDR" symbol, which indicates to the C program that the gethostbyaddr() routine is available to look up hosts by their "IP" addresses.

d_gethbyname

From d_gethbynm.U:

This variable conditionally defines the "HAS_GETHOSTBYNAME" symbol, which indicates to the C program that the gethostbyname() routine is available to look up host names in some data base or other.

d_gethent

From d_gethent.U:

This variable conditionally defines "HAS_GETHOSTENT" if gethostent() is available to look up host names in some data base or another.

d_gethname

From d_gethname.U:

This variable conditionally defines the "HAS_GETHOSTNAME" symbol, which indicates to the C program that the gethostname() routine may be used to derive the host name.

d_gethostbyaddr_r

From d_gethostbyaddr_r.U:

This variable conditionally defines the "HAS_GETHOSTBYADDR_R" symbol, which indicates to the C program that the gethostbyaddr_r() routine is available.

d_gethostbyname_r

From d_gethostbyname_r.U:

This variable conditionally defines the "HAS_GETHOSTBYNAME_R" symbol, which indicates to the C program that the gethostbyname_r() routine is available.

d_gethostent_r

From d_gethostent_r.U:

This variable conditionally defines the "HAS_GETHOSTENT_R" symbol, which indicates to the C program that the gethostent_r() routine is available.

d_gethostprotos

From d_gethostprotos.U:

This variable conditionally defines the "HAS_GETHOST_PROTOS" symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various gethost*() functions. See also netdbtype.U for probing for various netdb types.

d_getitimer

From d_getitimer.U:

This variable conditionally defines the "HAS_GETITIMER" symbol, which indicates to the C program that the getitimer() routine is available.

d_getlogin

From d_getlogin.U:

This variable conditionally defines the "HAS_GETLOGIN" symbol, which indicates to the C program that the getlogin() routine is available to get the login name.

d_getlogin_r

From d_getlogin_r.U:

This variable conditionally defines the "HAS_GETLOGIN_R" symbol, which indicates to the C program that the getlogin_r() routine is available.

d_getmnt

From d_getmnt.U:

This variable conditionally defines the "HAS_GETMNT" symbol, which indicates to the C program that the getmnt() routine is available to retrieve one or more mount info blocks by filename.

d_getmntent

From d_getmntent.U:

This variable conditionally defines the "HAS_GETMNTENT" symbol, which indicates to the C program that the getmntent() routine is available to iterate through mounted files to get their mount info.

d_getnameinfo

From d_getnameinfo.U:

This variable conditionally defines the "HAS_GETNAMEINFO" symbol, which indicates to the C program that the getnameinfo() function is available.

d_getnbyaddr

From d_getnbyad.U:

This variable conditionally defines the "HAS_GETNETBYADDR" symbol, which indicates to the C program that the getnetbyaddr() routine is available to look up networks by their "IP" addresses.

d_getnbyname

From d_getnbynm.U:

This variable conditionally defines the "HAS_GETNETBYNAME" symbol, which indicates to the C program that the getnetbyname() routine is available to look up networks by their names.

d_getnent

From d_getnent.U:

This variable conditionally defines "HAS_GETNETENT" if getnetent() is available to look up network names in some data base or another.

d_getnetbyaddr_r

From d_getnetbyaddr_r.U:

This variable conditionally defines the "HAS_GETNETBYADDR_R" symbol, which indicates to the C program that the getnetbyaddr_r() routine is available.

d_getnetbyname_r

From d_getnetbyname_r.U:

This variable conditionally defines the "HAS_GETNETBYNAME_R" symbol, which indicates to the C program that the getnetbyname_r() routine is available.

d_getnetent_r

From d_getnetent_r.U:

This variable conditionally defines the "HAS_GETNETENT_R" symbol, which indicates to the C program that the getnetent_r() routine is available.

d_getnetprotos

From d_getnetprotos.U:

This variable conditionally defines the "HAS_GETNET_PROTOS" symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various getnet*() functions. See also netdbtype.U for probing for various netdb types.

d_getpagsz

From d_getpagsz.U:

This variable conditionally defines "HAS_GETPAGESIZE" if getpagesize() is available to get the system page size.

d_getpbyname

From d_getprotby.U:

This variable conditionally defines the "HAS_GETPROTOBYNAME" symbol, which indicates to the C program that the getprotobyname() routine is available to look up protocols by their name.

d_getpbynumber

From d_getprotby.U:

This variable conditionally defines the "HAS_GETPROTOBYNUMBER" symbol, which indicates to the C program that the getprotobynumber() routine is available to look up protocols by their number.

d_getpent

From d_getpent.U:

This variable conditionally defines "HAS_GETPROTOENT" if getprotoent() is available to look up protocols in some data base or another.

d_getpgid

From d_getpgid.U:

This variable conditionally defines the "HAS_GETPGID" symbol, which indicates to the C program that the getpgid(pid) function is available to get the process group id.

d_getpgrp

From d_getpgrp.U:

This variable conditionally defines "HAS_GETPGRP" if getpgrp() is available to get the current process group.

d_getpgrp2

From d_getpgrp2.U:

This variable conditionally defines the

HAS_GETPGRP2

symbol, which indicates to the C program that the getpgrp2() (as in

DG/

"UX") routine is available to get the current process group.

d_getppid

From d_getppid.U:

This variable conditionally defines the "HAS_GETPPID" symbol, which indicates to the C program that the getppid() routine is available to get the parent process "ID".

d_getprior

From d_getprior.U:

This variable conditionally defines "HAS_GETPRIORITY" if getpriority() is available to get a process's priority.

d_getprotobyname_r

From d_getprotobyname_r.U:

This variable conditionally defines the "HAS_GETPROTOBYNAME_R" symbol, which indicates to the C program that the getprotobyname_r() routine is available.

d_getprotobynumber_r

From d_getprotobynumber_r.U:

This variable conditionally defines the "HAS_GETPROTOBYNUMBER_R" symbol, which indicates to the C program that the getprotobynumber_r() routine is available.

d_getprotoent_r

From d_getprotoent_r.U:

This variable conditionally defines the "HAS_GETPROTOENT_R" symbol, which indicates to the C program that the getprotoent_r() routine is available.

d_getprotoprotos

From d_getprotoprotos.U:

This variable conditionally defines the "HAS_GETPROTO_PROTOS" symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various getproto*() functions. See also netdbtype.U for probing for various netdb types.

d_getprpwnam

From d_getprpwnam.U:

This variable conditionally defines "HAS_GETPRPWNAM" if getprpwnam() is available to retrieve protected (shadow) password entries by name.

d_getpwent

From d_getpwent.U:

This variable conditionally defines the "HAS_GETPWENT" symbol, which indicates to the C program that the getpwent() routine is available for sequential access of the passwd database.

d_getpwent_r

From d_getpwent_r.U:

This variable conditionally defines the "HAS_GETPWENT_R" symbol, which indicates to the C program that the getpwent_r() routine is available.

d_getpwnam_r

From d_getpwnam_r.U:

This variable conditionally defines the "HAS_GETPWNAM_R" symbol, which indicates to the C program that the getpwnam_r() routine is available.

d_getpwuid_r

From d_getpwuid_r.U:

This variable conditionally defines the "HAS_GETPWUID_R" symbol, which indicates to the C program that the getpwuid_r() routine is available.

d_getsbyname

From d_getsrvby.U:

This variable conditionally defines the "HAS_GETSERVBYNAME" symbol, which indicates to the C program that the getservbyname() routine is available to look up services by their name.

d_getsbyport

From d_getsrvby.U:

This variable conditionally defines the "HAS_GETSERVBYPORT" symbol, which indicates to the C program that the getservbyport() routine is available to look up services by their port.

d_getsent

From d_getsent.U:

This variable conditionally defines "HAS_GETSERVENT" if getservent() is available to look up network services in some data base or another.

d_getservbyname_r

From d_getservbyname_r.U:

This variable conditionally defines the "HAS_GETSERVBYNAME_R" symbol, which indicates to the C program that the getservbyname_r() routine is available.

d_getservbyport_r

From d_getservbyport_r.U:

This variable conditionally defines the "HAS_GETSERVBYPORT_R" symbol, which indicates to the C program that the getservbyport_r() routine is available.

d_getservent_r

From d_getservent_r.U:

This variable conditionally defines the "HAS_GETSERVENT_R" symbol, which indicates to the C program that the getservent_r() routine is available.

d_getservprotos

From d_getservprotos.U:

This variable conditionally defines the "HAS_GETSERV_PROTOS" symbol, which indicates to the C program that <netdb.h> supplies prototypes for the various getserv*() functions. See also netdbtype.U for probing for various netdb types.

d_getspnam

From d_getspnam.U:

This variable conditionally defines "HAS_GETSPNAM" if getspnam() is available to retrieve SysV shadow password entries by name.

d_getspnam_r

From d_getspnam_r.U:

This variable conditionally defines the "HAS_GETSPNAM_R" symbol, which indicates to the C program that the getspnam_r() routine is available.

d_gettimeod

From d_ftime.U:

This variable conditionally defines the "HAS_GETTIMEOFDAY" symbol, which indicates that the gettimeofday() system call exists (to obtain a sub-second accuracy clock). You should probably include <sys/resource.h>.

d_gmtime64

From d_timefuncs64.U:

This variable conditionally defines the

HAS_GMTIME64

symbol, which indicates to the C program that the gmtime64 () routine is available.

d_gmtime_r

From d_gmtime_r.U:

This variable conditionally defines the "HAS_GMTIME_R" symbol, which indicates to the C program that the gmtime_r() routine is available.

d_gnulibc

From d_gnulibc.U:

Defined if we're dealing with the "GNU" C Library.

d_grpasswd

From i_grp.U:

This variable conditionally defines "GRPASSWD", which indicates that struct group in <grp.h> contains gr_passwd.

d_hasmntopt

From d_hasmntopt.U:

This variable conditionally defines the "HAS_HASMNTOPT" symbol, which indicates to the C program that the hasmntopt() routine is available to query the mount options of file systems.

d_htonl

From d_htonl.U:

This variable conditionally defines "HAS_HTONL" if htonl() and its friends are available to do network order byte swapping.

d_hypot

From d_hypot.U:

This variable conditionally defines "HAS_HYPOT" if hypot is available for numerically stable hypotenuse function.

d_ilogb

From d_ilogb.U:

This variable conditionally defines the "HAS_ILOGB" symbol, which indicates to the C program that the ilogb() routine is available for extracting the exponent of double x as a signed integer.

d_ilogbl

From d_ilogbl.U:

This variable conditionally defines the "HAS_ILOGBL" symbol, which indicates to the C program that the ilogbl() routine is available for extracting the exponent of long double x as a signed integer. If scalbnl is also present we can emulate frexpl.

d_inc_version_list

From inc_version_list.U:

This variable conditionally defines "PERL_INC_VERSION_LIST". It is set to undef when "PERL_INC_VERSION_LIST" is empty.

d_index

From d_strchr.U:

This variable conditionally defines "HAS_INDEX" if index() and rindex() are available for string searching.

d_inetaton

From d_inetaton.U:

This variable conditionally defines the "HAS_INET_ATON" symbol, which indicates to the C program that the inet_aton() function is available to parse "IP" address "dotted-quad" strings.

d_inetntop

From d_inetntop.U:

This variable conditionally defines the "HAS_INETNTOP" symbol, which indicates to the C program that the inet_ntop() function is available.

d_inetpton

From d_inetpton.U:

This variable conditionally defines the "HAS_INETPTON" symbol, which indicates to the C program that the inet_pton() function is available.

d_int64_t

From d_int64_t.U:

This symbol will be defined if the C compiler supports int64_t.

d_ip_mreq

From d_socket.U:

This variable conditionally defines the "HAS_IP_MREQ" symbol, which indicates the availability of a struct ip_mreq.

d_ip_mreq_source

From d_socket.U:

This variable conditionally defines the "HAS_IP_MREQ_SOURCE" symbol, which indicates the availability of a struct ip_mreq_source.

d_ipv6_mreq

From d_socket.U:

This variable conditionally defines the

HAS_IPV6_MREQ

symbol, which indicates the availability of a struct ipv6_mreq.

d_ipv6_mreq_source

From d_socket.U:

This variable conditionally defines the

HAS_IPV6_MREQ_SOURCE

symbol, which indicates the availability of a struct ipv6_mreq_source.

d_isascii

From d_isascii.U:

This variable conditionally defines the "HAS_ISASCII" constant, which indicates to the C program that isascii() is available.

d_isblank

From d_isblank.U:

This variable conditionally defines the "HAS_ISBLANK" constant, which indicates to the C program that isblank() is available.

d_isfinite

From d_isfinite.U:

This variable conditionally defines the "HAS_ISFINITE" symbol, which indicates to the C program that the isfinite() routine is available.

d_isfinitel

From d_isfinitel.U:

This variable conditionally defines the "HAS_ISFINITEL" symbol, which indicates to the C program that the isfinitel() routine is available.

d_isinf

From d_isinf.U:

This variable conditionally defines the "HAS_ISINF" symbol, which indicates to the C program that the isinf() routine is available.

d_isinfl

From d_isinfl.U:

This variable conditionally defines the "HAS_ISINFL" symbol, which indicates to the C program that the isinfl() routine is available.

d_isnan

From d_isnan.U:

This variable conditionally defines the "HAS_ISNAN" symbol, which indicates to the C program that the isnan() routine is available.

d_isnanl

From d_isnanl.U:

This variable conditionally defines the "HAS_ISNANL" symbol, which indicates to the C program that the isnanl() routine is available.

d_isnormal

From d_isnormal.U:

This variable conditionally defines the "HAS_ISNORMAL" symbol, which indicates to the C program that the isnormal() routine is available.

d_j0

From d_j0.U:

This variable conditionally defines the

HAS_J0

symbol, which indicates to the C program that the j0() routine is available.

d_j0l

From d_j0.U:

This variable conditionally defines the

HAS_J0L

symbol, which indicates to the C program that the j0l() routine is available.

d_killpg

From d_killpg.U:

This variable conditionally defines the "HAS_KILLPG" symbol, which indicates to the C program that the killpg() routine is available to kill process groups.

d_lc_monetary_2008

From d_lc_monetary_2008.U:

This variable conditionally defines

HAS_LC_MONETARY_2008

if libc has the international currency locale rules from "POSIX" 1003.1-2008.

d_lchown

From d_lchown.U:

This variable conditionally defines the "HAS_LCHOWN" symbol, which indicates to the C program that the lchown() routine is available to operate on a symbolic link (instead of following the link).

d_ldbl_dig

From d_ldbl_dig.U:

This variable conditionally defines d_ldbl_dig if this system's header files provide "LDBL_DIG", which is the number of significant digits in a long double precision number.

d_ldexpl

From d_longdbl.U:

This variable conditionally defines the "HAS_LDEXPL" symbol, which indicates to the C program that the ldexpl() routine is available.

d_lgamma

From d_lgamma.U:

This variable conditionally defines the "HAS_LGAMMA" symbol, which indicates to the C program that the lgamma() routine is available for the log gamma function. See also d_tgamma and d_lgamma_r.

d_lgamma_r

From d_lgamma_r.U:

This variable conditionally defines the "HAS_LGAMMA_R" symbol, which indicates to the C program that the lgamma_r() routine is available for the log gamma function, without using the global signgam variable.

d_libm_lib_version

From d_libm_lib_version.U:

This variable conditionally defines the "LIBM_LIB_VERSION" symbol, which indicates to the C program that math.h defines "_LIB_VERSION" being available in libm

d_libname_unique

From so.U:

This variable is defined if the target system insists on unique basenames for shared library files. This is currently true on Android, false everywhere else we know of. Defaults to "undef".

d_link

From d_link.U:

This variable conditionally defines "HAS_LINK" if link() is available to create hard links.

d_llrint

From d_llrint.U:

This variable conditionally defines the "HAS_LLRINT" symbol, which indicates to the C program that the llrint() routine is available to return the long long value closest to (according to the current rounding mode) to x.

d_llrintl

From d_llrintl.U:

This variable conditionally defines the "HAS_LLRINTL" symbol, which indicates to the C program that the llrintl() routine is available to return the long long value closest to (according to the current rounding mode) to long double x.

d_llround

From d_llround.U:

This variable conditionally defines the "HAS_LLROUND" symbol, which indicates to the C program that the llround() routine is available to return the long long value nearest to x.

d_llroundl

From d_llroundl.U:

This variable conditionally defines the "HAS_LLROUNDL" symbol, which indicates to the C program that the llroundl() routine is available to return the long long value nearest to long double x.

d_localtime64

From d_timefuncs64.U:

This variable conditionally defines the

HAS_LOCALTIME64

symbol, which indicates to the C program that the localtime64 () routine is available.

d_localtime_r

From d_localtime_r.U:

This variable conditionally defines the "HAS_LOCALTIME_R" symbol, which indicates to the C program that the localtime_r() routine is available.

d_localtime_r_needs_tzset

From d_localtime_r.U:

This variable conditionally defines the "LOCALTIME_R_NEEDS_TZSET" symbol, which makes us call tzset before localtime_r()

d_locconv

From d_locconv.U:

This variable conditionally defines "HAS_LOCALECONV" if localeconv() is available for numeric and monetary formatting conventions.

d_lockf

From d_lockf.U:

This variable conditionally defines "HAS_LOCKF" if lockf() is available to do file locking.

d_log1p

From d_log1p.U:

This variable conditionally defines the

HAS_LOG1P

symbol, which indicates to the C program that the logp1() routine is available to compute log(1 + x) for values of x close to zero.

d_log2

From d_log2.U:

This variable conditionally defines the

HAS_LOG2

symbol, which indicates to the C program that the log2() routine is available to compute log base two.

d_logb

From d_logb.U:

This variable conditionally defines the "HAS_LOGB" symbol, which indicates to the C program that the logb() routine is available to extract the exponent of x.

d_longdbl

From d_longdbl.U:

This variable conditionally defines "HAS_LONG_DOUBLE" if the long double type is supported.

d_longlong

From d_longlong.U:

This variable conditionally defines "HAS_LONG_LONG" if the long long type is supported.

d_lrint

From d_lrint.U:

This variable conditionally defines the "HAS_LRINT" symbol, which indicates to the C program that the lrint() routine is available to return the integral value closest to (according to the current rounding mode) to x.

d_lrintl

From d_lrintl.U:

This variable conditionally defines the "HAS_LRINTL" symbol, which indicates to the C program that the lrintl() routine is available to return the integral value closest to (according to the current rounding mode) to long double x.

d_lround

From d_lround.U:

This variable conditionally defines the "HAS_LROUND" symbol, which indicates to the C program that the lround() routine is available to return the integral value nearest to x.

d_lroundl

From d_lroundl.U:

This variable conditionally defines the "HAS_LROUNDL" symbol, which indicates to the C program that the lroundl() routine is available to return the integral value nearest to x of the long double argument.

d_lseekproto

From d_lseekproto.U:

This variable conditionally defines the "HAS_LSEEK_PROTO" symbol, which indicates to the C program that the system provides a prototype for the lseek() function. Otherwise, it is up to the program to supply one.

d_lstat

From d_lstat.U:

This variable conditionally defines "HAS_LSTAT" if lstat() is available to do file stats on symbolic links.

d_madvise

From d_madvise.U:

This variable conditionally defines "HAS_MADVISE" if madvise() is available to map a file into memory.

d_malloc_good_size

From d_malloc_size.U:

This symbol, if defined, indicates that the malloc_good_size routine is available for use.

d_malloc_size

From d_malloc_size.U:

This symbol, if defined, indicates that the malloc_size routine is available for use.

d_mblen

From d_mblen.U:

This variable conditionally defines the "HAS_MBLEN" symbol, which indicates to the C program that the mblen() routine is available to find the number of bytes in a multibye character.

d_mbstowcs

From d_mbstowcs.U:

This variable conditionally defines the "HAS_MBSTOWCS" symbol, which indicates to the C program that the mbstowcs() routine is available to convert a multibyte string into a wide character string.

d_mbtowc

From d_mbtowc.U:

This variable conditionally defines the "HAS_MBTOWC" symbol, which indicates to the C program that the mbtowc() routine is available to convert multibyte to a wide character.

d_memchr

From d_memchr.U:

This variable conditionally defines the "HAS_MEMCHR" symbol, which indicates to the C program that the memchr() routine is available to locate characters within a C string.

d_memcmp

From d_memcmp.U:

This variable conditionally defines the "HAS_MEMCMP" symbol, which indicates to the C program that the memcmp() routine is available to compare blocks of memory.

d_memcpy

From d_memcpy.U:

This variable conditionally defines the "HAS_MEMCPY" symbol, which indicates to the C program that the memcpy() routine is available to copy blocks of memory.

d_memmove

From d_memmove.U:

This variable conditionally defines the "HAS_MEMMOVE" symbol, which indicates to the C program that the memmove() routine is available to copy potentially overlapping blocks of memory.

d_memset

From d_memset.U:

This variable conditionally defines the "HAS_MEMSET" symbol, which indicates to the C program that the memset() routine is available to set blocks of memory.

d_mkdir

From d_mkdir.U:

This variable conditionally defines the "HAS_MKDIR" symbol, which indicates to the C program that the mkdir() routine is available to create directories..

d_mkdtemp

From d_mkdtemp.U:

This variable conditionally defines the "HAS_MKDTEMP" symbol, which indicates to the C program that the mkdtemp() routine is available to exclusively create a uniquely named temporary directory.

d_mkfifo

From d_mkfifo.U:

This variable conditionally defines the "HAS_MKFIFO" symbol, which indicates to the C program that the mkfifo() routine is available.

d_mkstemp

From d_mkstemp.U:

This variable conditionally defines the "HAS_MKSTEMP" symbol, which indicates to the C program that the mkstemp() routine is available to exclusively create and open a uniquely named temporary file.

d_mkstemps

From d_mkstemps.U:

This variable conditionally defines the "HAS_MKSTEMPS" symbol, which indicates to the C program that the mkstemps() routine is available to exclusively create and open a uniquely named (with a suffix) temporary file.

d_mktime

From d_mktime.U:

This variable conditionally defines the "HAS_MKTIME" symbol, which indicates to the C program that the mktime() routine is available.

d_mktime64

From d_timefuncs64.U:

This variable conditionally defines the

HAS_MKTIME64

symbol, which indicates to the C program that the mktime64 () routine is available.

d_mmap

From d_mmap.U:

This variable conditionally defines "HAS_MMAP" if mmap() is available to map a file into memory.

d_modfl

From d_modfl.U:

This variable conditionally defines the "HAS_MODFL" symbol, which indicates to the C program that the modfl() routine is available.

d_modfl_pow32_bug

From d_modfl.U:

This variable conditionally defines the

HAS_MODFL_POW32_BUG

symbol, which indicates that modfl() is broken for long doubles >= pow(2, 32). For example from 4294967303.150000 one would get 4294967302.000000 and 1.150000. The bug has been seen in certain versions of glibc, release 2.2.2 is known to be okay.

d_modflproto

From d_modfl.U:

This symbol, if defined, indicates that the system provides a prototype for the modfl() function. Otherwise, it is up to the program to supply one. C99 says it should be long double modfl(long double, long double *);

d_mprotect

From d_mprotect.U:

This variable conditionally defines "HAS_MPROTECT" if mprotect() is available to modify the access protection of a memory mapped file.

d_msg

From d_msg.U:

This variable conditionally defines the "HAS_MSG" symbol, which indicates that the entire msg*(2) library is present.

d_msg_ctrunc

From d_socket.U:

This variable conditionally defines the "HAS_MSG_CTRUNC" symbol, which indicates that the "MSG_CTRUNC" is available. #ifdef is not enough because it may be an enum, glibc has been known to do this.

d_msg_dontroute

From d_socket.U:

This variable conditionally defines the "HAS_MSG_DONTROUTE" symbol, which indicates that the "MSG_DONTROUTE" is available. #ifdef is not enough because it may be an enum, glibc has been known to do this.

d_msg_oob

From d_socket.U:

This variable conditionally defines the "HAS_MSG_OOB" symbol, which indicates that the "MSG_OOB" is available. #ifdef is not enough because it may be an enum, glibc has been known to do this.

d_msg_peek

From d_socket.U:

This variable conditionally defines the "HAS_MSG_PEEK" symbol, which indicates that the "MSG_PEEK" is available. #ifdef is not enough because it may be an enum, glibc has been known to do this.

d_msg_proxy

From d_socket.U:

This variable conditionally defines the "HAS_MSG_PROXY" symbol, which indicates that the "MSG_PROXY" is available. #ifdef is not enough because it may be an enum, glibc has been known to do this.

d_msgctl

From d_msgctl.U:

This variable conditionally defines the "HAS_MSGCTL" symbol, which indicates to the C program that the msgctl() routine is available.

d_msgget

From d_msgget.U:

This variable conditionally defines the "HAS_MSGGET" symbol, which indicates to the C program that the msgget() routine is available.

d_msghdr_s

From d_msghdr_s.U:

This variable conditionally defines the "HAS_STRUCT_MSGHDR" symbol, which indicates that the struct msghdr is supported.

d_msgrcv

From d_msgrcv.U:

This variable conditionally defines the "HAS_MSGRCV" symbol, which indicates to the C program that the msgrcv() routine is available.

d_msgsnd

From d_msgsnd.U:

This variable conditionally defines the "HAS_MSGSND" symbol, which indicates to the C program that the msgsnd() routine is available.

d_msync

From d_msync.U:

This variable conditionally defines "HAS_MSYNC" if msync() is available to synchronize a mapped file.

d_munmap

From d_munmap.U:

This variable conditionally defines "HAS_MUNMAP" if munmap() is available to unmap a region mapped by mmap().

d_mymalloc

From mallocsrc.U:

This variable conditionally defines "MYMALLOC" in case other parts of the source want to take special action if "MYMALLOC" is used. This may include different sorts of profiling or error detection.

d_nan

From d_nan.U:

This variable conditionally defines "HAS_NAN" if nan() is available to generate NaN.

d_ndbm

From i_ndbm.U:

This variable conditionally defines the "HAS_NDBM" symbol, which indicates that both the ndbm.h include file and an appropriate ndbm library exist. Consult the different i_*ndbm variables to find out the actual include location. Sometimes, a system has the header file but not the library. This variable will only be set if the system has both.

d_ndbm_h_uses_prototypes

From i_ndbm.U:

This variable conditionally defines the "NDBM_H_USES_PROTOTYPES" symbol, which indicates that the ndbm.h include file uses real "ANSI" C prototypes instead of K&R style function declarations. K&R style declarations are unsupported in C

, so the include file requires special handling when using a C

compiler and this variable is undefined. Consult the different d_*ndbm_h_uses_prototypes variables to get the same information for alternative ndbm.h include files.

d_nearbyint

From d_nearbyint.U:

This variable conditionally defines "HAS_NEARBYINT" if nearbyint() is available to return the integral value closest to (according to the current rounding mode) to x.

d_nextafter

From d_nextafter.U:

This variable conditionally defines "HAS_NEXTAFTER" if nextafter() is available to return the next machine representable double from x in direction y.

d_nexttoward

From d_nexttoward.U:

This variable conditionally defines "HAS_NEXTTOWARD" if nexttoward() is available to return the next machine representable long double from x in direction y.

d_nice

From d_nice.U:

This variable conditionally defines the "HAS_NICE" symbol, which indicates to the C program that the nice() routine is available.

d_nl_langinfo

From d_nl_langinfo.U:

This variable conditionally defines the "HAS_NL_LANGINFO" symbol, which indicates to the C program that the nl_langinfo() routine is available.

d_nv_preserves_uv

From perlxv.U:

This variable indicates whether a variable of type nvtype can preserve all the bits a variable of type uvtype.

d_nv_zero_is_allbits_zero

From perlxv.U:

This variable indicates whether a variable of type nvtype stores 0.0 in memory as all bits zero.

d_off64_t

From d_off64_t.U:

This symbol will be defined if the C compiler supports off64_t.

d_old_pthread_create_joinable

From d_pthrattrj.U:

This variable conditionally defines pthread_create_joinable. undef if pthread.h defines "PTHREAD_CREATE_JOINABLE".

d_oldpthreads

From usethreads.U:

This variable conditionally defines the "OLD_PTHREADS_API" symbol, and indicates that Perl should be built to use the old draft "POSIX" threads "API". This is only potentially meaningful if usethreads is set.

d_oldsock

From d_socket.U:

This variable conditionally defines the "OLDSOCKET" symbol, which indicates that the "BSD" socket interface is based on 4.1c and not 4.2.

d_open3

From d_open3.U:

This variable conditionally defines the

HAS_OPEN3

manifest constant, which indicates to the C program that the 3 argument version of the open(2) function is available.

d_pathconf

From d_pathconf.U:

This variable conditionally defines the "HAS_PATHCONF" symbol, which indicates to the C program that the pathconf() routine is available to determine file-system related limits and options associated with a given filename.

d_pause

From d_pause.U:

This variable conditionally defines the "HAS_PAUSE" symbol, which indicates to the C program that the pause() routine is available to suspend a process until a signal is received.

d_perl_otherlibdirs

From otherlibdirs.U:

This variable conditionally defines "PERL_OTHERLIBDIRS", which contains a colon-separated set of paths for the perl binary to include in @"INC". See also otherlibdirs.

d_phostname

From d_gethname.U:

This variable conditionally defines the "HAS_PHOSTNAME" symbol, which contains the shell command which, when fed to popen(), may be used to derive the host name.

d_pipe

From d_pipe.U:

This variable conditionally defines the "HAS_PIPE" symbol, which indicates to the C program that the pipe() routine is available to create an inter-process channel.

d_poll

From d_poll.U:

This variable conditionally defines the "HAS_POLL" symbol, which indicates to the C program that the poll() routine is available to poll active file descriptors.

d_portable

From d_portable.U:

This variable conditionally defines the "PORTABLE" symbol, which indicates to the C program that it should not assume that it is running on the machine it was compiled on.

d_prctl

From d_prctl.U:

This variable conditionally defines the "HAS_PRCTL" symbol, which indicates to the C program that the prctl() routine is available. Note that there are at least two prctl variants: Linux and Irix. While they are somewhat similar, they are incompatible.

d_prctl_set_name

From d_prctl.U:

This variable conditionally defines the "HAS_PRCTL_SET_NAME" symbol, which indicates to the C program that the prctl() routine supports the "PR_SET_NAME" option.

d_PRId64

From quadfio.U:

This variable conditionally defines the PERL_PRId64 symbol, which indicates that stdio has a symbol to print 64-bit decimal numbers.

d_PRIeldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles.

d_PRIEUldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. The "U" in the name is to separate this from d_PRIeldbl so that even case-blind systems can see the difference.

d_PRIfldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles.

d_PRIFUldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. The "U" in the name is to separate this from d_PRIfldbl so that even case-blind systems can see the difference.

d_PRIgldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles.

d_PRIGUldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to print long doubles. The "U" in the name is to separate this from d_PRIgldbl so that even case-blind systems can see the difference.

d_PRIi64

From quadfio.U:

This variable conditionally defines the PERL_PRIi64 symbol, which indicates that stdio has a symbol to print 64-bit decimal numbers.

d_printf_format_null

From d_attribut.U:

This variable conditionally defines "PRINTF_FORMAT_NULL_OK", which indicates the C compiler allows printf-like formats to be null.

d_PRIo64

From quadfio.U:

This variable conditionally defines the PERL_PRIo64 symbol, which indicates that stdio has a symbol to print 64-bit octal numbers.

d_PRIu64

From quadfio.U:

This variable conditionally defines the PERL_PRIu64 symbol, which indicates that stdio has a symbol to print 64-bit unsigned decimal numbers.

d_PRIx64

From quadfio.U:

This variable conditionally defines the PERL_PRIx64 symbol, which indicates that stdio has a symbol to print 64-bit hexadecimal numbers.

d_PRIXU64

From quadfio.U:

This variable conditionally defines the

PERL_PRIXU64

symbol, which indicates that stdio has a symbol to print 64-bit hExADECimAl numbers. The "U" in the name is to separate this from d_PRIx64 so that even case-blind systems can see the difference.

d_procselfexe

From d_procselfexe.U:

Defined if $procselfexe is symlink to the absolute pathname of the executing program.

d_pseudofork

From d_vfork.U:

This variable conditionally defines the "HAS_PSEUDOFORK" symbol, which indicates that an emulation of the fork routine is available.

d_pthread_atfork

From d_pthread_atfork.U:

This variable conditionally defines the "HAS_PTHREAD_ATFORK" symbol, which indicates to the C program that the pthread_atfork() routine is available.

d_pthread_attr_setscope

From d_pthread_attr_ss.U:

This variable conditionally defines "HAS_PTHREAD_ATTR_SETSCOPE" if pthread_attr_setscope() is available to set the contention scope attribute of a thread attribute object.

d_pthread_yield

From d_pthread_y.U:

This variable conditionally defines the "HAS_PTHREAD_YIELD" symbol if the pthread_yield routine is available to yield the execution of the current thread.

d_ptrdiff_t

From d_ptrdiff_t.U:

This symbol will be defined if the C compiler supports ptrdiff_t.

d_pwage

From i_pwd.U:

This variable conditionally defines "PWAGE", which indicates that struct passwd contains pw_age.

d_pwchange

From i_pwd.U:

This variable conditionally defines "PWCHANGE", which indicates that struct passwd contains pw_change.

d_pwclass

From i_pwd.U:

This variable conditionally defines "PWCLASS", which indicates that struct passwd contains pw_class.

d_pwcomment

From i_pwd.U:

This variable conditionally defines "PWCOMMENT", which indicates that struct passwd contains pw_comment.

d_pwexpire

From i_pwd.U:

This variable conditionally defines "PWEXPIRE", which indicates that struct passwd contains pw_expire.

d_pwgecos

From i_pwd.U:

This variable conditionally defines "PWGECOS", which indicates that struct passwd contains pw_gecos.

d_pwpasswd

From i_pwd.U:

This variable conditionally defines "PWPASSWD", which indicates that struct passwd contains pw_passwd.

d_pwquota

From i_pwd.U:

This variable conditionally defines "PWQUOTA", which indicates that struct passwd contains pw_quota.

d_qgcvt

From d_qgcvt.U:

This variable conditionally defines the "HAS_QGCVT" symbol, which indicates to the C program that the qgcvt() routine is available.

d_quad

From quadtype.U:

This variable, if defined, tells that there's a 64-bit integer type, quadtype.

d_random_r

From d_random_r.U:

This variable conditionally defines the "HAS_RANDOM_R" symbol, which indicates to the C program that the random_r() routine is available.

d_re_comp

From d_regcmp.U:

This variable conditionally defines the "HAS_RECOMP" symbol, which indicates to the C program that the re_comp() routine is available for regular patern matching (usally on "BSD"). If so, it is likely that re_exec() exists.

d_readdir

From d_readdir.U:

This variable conditionally defines "HAS_READDIR" if readdir() is available to read directory entries.

d_readdir64_r

From d_readdir64_r.U:

This variable conditionally defines the

HAS_READDIR64_R

symbol, which indicates to the C program that the readdir64_r() routine is available.

d_readdir_r

From d_readdir_r.U:

This variable conditionally defines the "HAS_READDIR_R" symbol, which indicates to the C program that the readdir_r() routine is available.

d_readlink

From d_readlink.U:

This variable conditionally defines the "HAS_READLINK" symbol, which indicates to the C program that the readlink() routine is available to read the value of a symbolic link.

d_readv

From d_readv.U:

This variable conditionally defines the "HAS_READV" symbol, which indicates to the C program that the readv() routine is available.

d_recvmsg

From d_recvmsg.U:

This variable conditionally defines the "HAS_RECVMSG" symbol, which indicates to the C program that the recvmsg() routine is available.

d_regcmp

From d_regcmp.U:

This variable conditionally defines the "HAS_REGCMP" symbol, which indicates to the C program that the regcmp() routine is available for regular patern matching (usally on System V).

d_regcomp

From d_regcmp.U:

This variable conditionally defines the "HAS_REGCOMP" symbol, which indicates to the C program that the regcomp() routine is available for regular patern matching (usally on

POSIX.2

conforming systems).

d_remainder

From d_remainder.U:

This variable conditionally defines the "HAS_REMAINDER" symbol, which indicates to the C program that the remainder() routine is available.

d_remquo

From d_remquo.U:

This variable conditionally defines the "HAS_REMQUO" symbol, which indicates to the C program that the remquo() routine is available.

d_rename

From d_rename.U:

This variable conditionally defines the "HAS_RENAME" symbol, which indicates to the C program that the rename() routine is available to rename files.

d_rewinddir

From d_readdir.U:

This variable conditionally defines "HAS_REWINDDIR" if rewinddir() is available.

d_rint

From d_rint.U:

This variable conditionally defines the "HAS_RINT" symbol, which indicates to the C program that the rint() routine is available.

d_rmdir

From d_rmdir.U:

This variable conditionally defines "HAS_RMDIR" if rmdir() is available to remove directories.

d_round

From d_round.U:

This variable conditionally defines the "HAS_ROUND" symbol, which indicates to the C program that the round() routine is available.

d_safebcpy

From d_safebcpy.U:

This variable conditionally defines the "HAS_SAFE_BCOPY" symbol if the bcopy() routine can do overlapping copies. Normally, you should probably use memmove().

d_safemcpy

From d_safemcpy.U:

This variable conditionally defines the "HAS_SAFE_MEMCPY" symbol if the memcpy() routine can do overlapping copies. For overlapping copies, memmove() should be used, if available.

d_sanemcmp

From d_sanemcmp.U:

This variable conditionally defines the "HAS_SANE_MEMCMP" symbol if the memcpy() routine is available and can be used to compare relative magnitudes of chars with their high bits set.

d_sbrkproto

From d_sbrkproto.U:

This variable conditionally defines the "HAS_SBRK_PROTO" symbol, which indicates to the C program that the system provides a prototype for the sbrk() function. Otherwise, it is up to the program to supply one.

d_scalbn

From d_scalbn.U:

This variable conditionally defines the "HAS_SCALBN" symbol, which indicates to the C program that the scalbn() routine is available.

d_scalbnl

From d_scalbnl.U:

This variable conditionally defines the "HAS_SCALBNL" symbol, which indicates to the C program that the scalbnl() routine is available. If ilogbl is also present we can emulate frexpl.

d_sched_yield

From d_pthread_y.U:

This variable conditionally defines the "HAS_SCHED_YIELD" symbol if the sched_yield routine is available to yield the execution of the current thread.

d_scm_rights

From d_socket.U:

This variable conditionally defines the "HAS_SCM_RIGHTS" symbol, which indicates that the "SCM_RIGHTS" is available. #ifdef is not enough because it may be an enum, glibc has been known to do this.

d_SCNfldbl

From longdblfio.U:

This variable conditionally defines the PERL_PRIfldbl symbol, which indicates that stdio has a symbol to scan long doubles.

d_seekdir

From d_readdir.U:

This variable conditionally defines "HAS_SEEKDIR" if seekdir() is available.

d_select

From d_select.U:

This variable conditionally defines "HAS_SELECT" if select() is available to select active file descriptors. A <sys/time.h> inclusion may be necessary for the timeout field.

d_sem

From d_sem.U:

This variable conditionally defines the "HAS_SEM" symbol, which indicates that the entire sem*(2) library is present.

d_semctl

From d_semctl.U:

This variable conditionally defines the "HAS_SEMCTL" symbol, which indicates to the C program that the semctl() routine is available.

d_semctl_semid_ds

From d_union_semun.U:

This variable conditionally defines "USE_SEMCTL_SEMID_DS", which indicates that struct semid_ds * is to be used for semctl "IPC_STAT".

d_semctl_semun

From d_union_semun.U:

This variable conditionally defines "USE_SEMCTL_SEMUN", which indicates that union semun is to be used for semctl "IPC_STAT".

d_semget

From d_semget.U:

This variable conditionally defines the "HAS_SEMGET" symbol, which indicates to the C program that the semget() routine is available.

d_semop

From d_semop.U:

This variable conditionally defines the "HAS_SEMOP" symbol, which indicates to the C program that the semop() routine is available.

d_sendmsg

From d_sendmsg.U:

This variable conditionally defines the "HAS_SENDMSG" symbol, which indicates to the C program that the sendmsg() routine is available.

d_setegid

From d_setegid.U:

This variable conditionally defines the "HAS_SETEGID" symbol, which indicates to the C program that the setegid() routine is available to change the effective gid of the current program.

d_seteuid

From d_seteuid.U:

This variable conditionally defines the "HAS_SETEUID" symbol, which indicates to the C program that the seteuid() routine is available to change the effective uid of the current program.

d_setgrent

From d_setgrent.U:

This variable conditionally defines the "HAS_SETGRENT" symbol, which indicates to the C program that the setgrent() routine is available for initializing sequential access to the group database.

d_setgrent_r

From d_setgrent_r.U:

This variable conditionally defines the "HAS_SETGRENT_R" symbol, which indicates to the C program that the setgrent_r() routine is available.

d_setgrps

From d_setgrps.U:

This variable conditionally defines the "HAS_SETGROUPS" symbol, which indicates to the C program that the setgroups() routine is available to set the list of process groups.

d_sethent

From d_sethent.U:

This variable conditionally defines "HAS_SETHOSTENT" if sethostent() is available.

d_sethostent_r

From d_sethostent_r.U:

This variable conditionally defines the "HAS_SETHOSTENT_R" symbol, which indicates to the C program that the sethostent_r() routine is available.

d_setitimer

From d_setitimer.U:

This variable conditionally defines the "HAS_SETITIMER" symbol, which indicates to the C program that the setitimer() routine is available.

d_setlinebuf

From d_setlnbuf.U:

This variable conditionally defines the "HAS_SETLINEBUF" symbol, which indicates to the C program that the setlinebuf() routine is available to change stderr or stdout from block-buffered or unbuffered to a line-buffered mode.

d_setlocale

From d_setlocale.U:

This variable conditionally defines "HAS_SETLOCALE" if setlocale() is available to handle locale-specific ctype implementations.

d_setlocale_r

From d_setlocale_r.U:

This variable conditionally defines the "HAS_SETLOCALE_R" symbol, which indicates to the C program that the setlocale_r() routine is available.

d_setnent

From d_setnent.U:

This variable conditionally defines "HAS_SETNETENT" if setnetent() is available.

d_setnetent_r

From d_setnetent_r.U:

This variable conditionally defines the "HAS_SETNETENT_R" symbol, which indicates to the C program that the setnetent_r() routine is available.

d_setpent

From d_setpent.U:

This variable conditionally defines "HAS_SETPROTOENT" if setprotoent() is available.

d_setpgid

From d_setpgid.U:

This variable conditionally defines the "HAS_SETPGID" symbol if the setpgid(pid, gpid) function is available to set process group "ID".

d_setpgrp

From d_setpgrp.U:

This variable conditionally defines "HAS_SETPGRP" if setpgrp() is available to set the current process group.

d_setpgrp2

From d_setpgrp2.U:

This variable conditionally defines the

HAS_SETPGRP2

symbol, which indicates to the C program that the setpgrp2() (as in

DG/

"UX") routine is available to set the current process group.

d_setprior

From d_setprior.U:

This variable conditionally defines "HAS_SETPRIORITY" if setpriority() is available to set a process's priority.

d_setproctitle

From d_setproctitle.U:

This variable conditionally defines the "HAS_SETPROCTITLE" symbol, which indicates to the C program that the setproctitle() routine is available.

d_setprotoent_r

From d_setprotoent_r.U:

This variable conditionally defines the "HAS_SETPROTOENT_R" symbol, which indicates to the C program that the setprotoent_r() routine is available.

d_setpwent

From d_setpwent.U:

This variable conditionally defines the "HAS_SETPWENT" symbol, which indicates to the C program that the setpwent() routine is available for initializing sequential access to the passwd database.

d_setpwent_r

From d_setpwent_r.U:

This variable conditionally defines the "HAS_SETPWENT_R" symbol, which indicates to the C program that the setpwent_r() routine is available.

d_setregid

From d_setregid.U:

This variable conditionally defines "HAS_SETREGID" if setregid() is available to change the real and effective gid of the current process.

d_setresgid

From d_setregid.U:

This variable conditionally defines "HAS_SETRESGID" if setresgid() is available to change the real, effective and saved gid of the current process.

d_setresuid

From d_setreuid.U:

This variable conditionally defines "HAS_SETREUID" if setresuid() is available to change the real, effective and saved uid of the current process.

d_setreuid

From d_setreuid.U:

This variable conditionally defines "HAS_SETREUID" if setreuid() is available to change the real and effective uid of the current process.

d_setrgid

From d_setrgid.U:

This variable conditionally defines the "HAS_SETRGID" symbol, which indicates to the C program that the setrgid() routine is available to change the real gid of the current program.

d_setruid

From d_setruid.U:

This variable conditionally defines the "HAS_SETRUID" symbol, which indicates to the C program that the setruid() routine is available to change the real uid of the current program.

d_setsent

From d_setsent.U:

This variable conditionally defines "HAS_SETSERVENT" if setservent() is available.

d_setservent_r

From d_setservent_r.U:

This variable conditionally defines the "HAS_SETSERVENT_R" symbol, which indicates to the C program that the setservent_r() routine is available.

d_setsid

From d_setsid.U:

This variable conditionally defines "HAS_SETSID" if setsid() is available to set the process group "ID".

d_setvbuf

From d_setvbuf.U:

This variable conditionally defines the "HAS_SETVBUF" symbol, which indicates to the C program that the setvbuf() routine is available to change buffering on an open stdio stream.

d_shm

From d_shm.U:

This variable conditionally defines the "HAS_SHM" symbol, which indicates that the entire shm*(2) library is present.

d_shmat

From d_shmat.U:

This variable conditionally defines the "HAS_SHMAT" symbol, which indicates to the C program that the shmat() routine is available.

d_shmatprototype

From d_shmat.U:

This variable conditionally defines the "HAS_SHMAT_PROTOTYPE" symbol, which indicates that sys/shm.h has a prototype for shmat.

d_shmctl

From d_shmctl.U:

This variable conditionally defines the "HAS_SHMCTL" symbol, which indicates to the C program that the shmctl() routine is available.

d_shmdt

From d_shmdt.U:

This variable conditionally defines the "HAS_SHMDT" symbol, which indicates to the C program that the shmdt() routine is available.

d_shmget

From d_shmget.U:

This variable conditionally defines the "HAS_SHMGET" symbol, which indicates to the C program that the shmget() routine is available.

d_sigaction

From d_sigaction.U:

This variable conditionally defines the "HAS_SIGACTION" symbol, which indicates that the Vr4 sigaction() routine is available.

d_signbit

From d_signbit.U:

This variable conditionally defines the "HAS_SIGNBIT" symbol, which indicates to the C program that the signbit() routine is available and safe to use with perl's intern "NV" type.

d_sigprocmask

From d_sigprocmask.U:

This variable conditionally defines "HAS_SIGPROCMASK" if sigprocmask() is available to examine or change the signal mask of the calling process.

d_sigsetjmp

From d_sigsetjmp.U:

This variable conditionally defines the "HAS_SIGSETJMP" symbol, which indicates that the sigsetjmp() routine is available to call setjmp() and optionally save the process's signal mask.

d_sin6_scope_id

From d_socket.U:

This variable conditionally defines the

HAS_SIN6_SCOPE_ID

symbol, which indicates that a struct sockaddr_in6 structure has the sin6_scope_id member.

d_sitearch

From sitearch.U:

This variable conditionally defines "SITEARCH" to hold the pathname of architecture-dependent library files for $package. If $sitearch is the same as $archlib, then this is set to undef.

d_snprintf

From d_snprintf.U:

This variable conditionally defines the "HAS_SNPRINTF" symbol, which indicates to the C program that the snprintf () library function is available.

d_sockaddr_in6

From d_socket.U:

This variable conditionally defines the

HAS_SOCKADDR_IN6

symbol, which indicates the availability of a struct sockaddr_in6.

d_sockaddr_sa_len

From d_socket.U:

This variable conditionally defines the "HAS_SOCKADDR_SA_LEN" symbol, which indicates that a struct sockaddr structure has the sa_len member.

d_sockatmark

From d_sockatmark.U:

This variable conditionally defines the "HAS_SOCKATMARK" symbol, which indicates to the C program that the sockatmark() routine is available.

d_sockatmarkproto

From d_sockatmarkproto.U:

This variable conditionally defines the "HAS_SOCKATMARK_PROTO" symbol, which indicates to the C program that the system provides a prototype for the sockatmark() function. Otherwise, it is up to the program to supply one.

d_socket

From d_socket.U:

This variable conditionally defines "HAS_SOCKET", which indicates that the "BSD" socket interface is supported.

d_socklen_t

From d_socklen_t.U:

This symbol will be defined if the C compiler supports socklen_t.

d_sockpair

From d_socket.U:

This variable conditionally defines the "HAS_SOCKETPAIR" symbol, which indicates that the "BSD" socketpair() is supported.

d_socks5_init

From d_socks5_init.U:

This variable conditionally defines the

HAS_SOCKS5_INIT

symbol, which indicates to the C program that the socks5_init() routine is available.

d_sprintf_returns_strlen

From d_sprintf_len.U:

This variable defines whether sprintf returns the length of the string (as per the "ANSI" spec). Some C libraries retain compatibility with pre-"ANSI" C and return a pointer to the passed in buffer; for these this variable will be undef.

d_sqrtl

From d_sqrtl.U:

This variable conditionally defines the "HAS_SQRTL" symbol, which indicates to the C program that the sqrtl() routine is available.

d_srand48_r

From d_srand48_r.U:

This variable conditionally defines the

HAS_SRAND48_R

symbol, which indicates to the C program that the srand48_r() routine is available.

d_srandom_r

From d_srandom_r.U:

This variable conditionally defines the "HAS_SRANDOM_R" symbol, which indicates to the C program that the srandom_r() routine is available.

d_sresgproto

From d_sresgproto.U:

This variable conditionally defines the "HAS_SETRESGID_PROTO" symbol, which indicates to the C program that the system provides a prototype for the setresgid() function. Otherwise, it is up to the program to supply one.

d_sresuproto

From d_sresuproto.U:

This variable conditionally defines the "HAS_SETRESUID_PROTO" symbol, which indicates to the C program that the system provides a prototype for the setresuid() function. Otherwise, it is up to the program to supply one.

d_stat

From d_stat.U:

This variable conditionally defines "HAS_STAT" if stat() is available to get file status.

d_statblks

From d_statblks.U:

This variable conditionally defines "USE_STAT_BLOCKS" if this system has a stat structure declaring st_blksize and st_blocks.

d_statfs_f_flags

From d_statfs_f_flags.U:

This variable conditionally defines the "HAS_STRUCT_STATFS_F_FLAGS" symbol, which indicates to struct statfs from has f_flags member. This kind of struct statfs is coming from sys/mount.h ("BSD"), not from sys/statfs.h ("SYSV").

d_statfs_s

From d_statfs_s.U:

This variable conditionally defines the "HAS_STRUCT_STATFS" symbol, which indicates that the struct statfs is supported.

d_static_inline

From d_static_inline.U:

This variable conditionally defines the "HAS_STATIC_INLINE" symbol, which indicates that the C compiler supports C99-style static inline. That is, the function can't be called from another translation unit.

d_statvfs

From d_statvfs.U:

This variable conditionally defines the "HAS_STATVFS" symbol, which indicates to the C program that the statvfs() routine is available.

d_stdio_cnt_lval

From d_stdstdio.U:

This variable conditionally defines "STDIO_CNT_LVALUE" if the "FILE_cnt" macro can be used as an lvalue.

d_stdio_ptr_lval

From d_stdstdio.U:

This variable conditionally defines "STDIO_PTR_LVALUE" if the "FILE_ptr" macro can be used as an lvalue.

d_stdio_ptr_lval_nochange_cnt

From d_stdstdio.U:

This symbol is defined if using the "FILE_ptr" macro as an lvalue to increase the pointer by n leaves File_cnt(fp) unchanged.

d_stdio_ptr_lval_sets_cnt

From d_stdstdio.U:

This symbol is defined if using the "FILE_ptr" macro as an lvalue to increase the pointer by n has the side effect of decreasing the value of File_cnt(fp) by n.

d_stdio_stream_array

From stdio_streams.U:

This variable tells whether there is an array holding the stdio streams.

d_stdiobase

From d_stdstdio.U:

This variable conditionally defines "USE_STDIO_BASE" if this system has a "FILE" structure declaring a usable _base field (or equivalent) in stdio.h.

d_stdstdio

From d_stdstdio.U:

This variable conditionally defines "USE_STDIO_PTR" if this system has a "FILE" structure declaring usable _ptr and _cnt fields (or equivalent) in stdio.h.

d_strchr

From d_strchr.U:

This variable conditionally defines "HAS_STRCHR" if strchr() and strrchr() are available for string searching.

d_strcoll

From d_strcoll.U:

This variable conditionally defines "HAS_STRCOLL" if strcoll() is available to compare strings using collating information.

d_strctcpy

From d_strctcpy.U:

This variable conditionally defines the "USE_STRUCT_COPY" symbol, which indicates to the C program that this C compiler knows how to copy structures.

d_strerrm

From d_strerror.U:

This variable holds what Strerror is defined as to translate an error code condition into an error message string. It could be "strerror" or a more "complex" macro emulating strerror with sys_errlist[], or the "unknown" string when both strerror and sys_errlist are missing.

d_strerror

From d_strerror.U:

This variable conditionally defines "HAS_STRERROR" if strerror() is available to translate error numbers to strings.

d_strerror_r

From d_strerror_r.U:

This variable conditionally defines the "HAS_STRERROR_R" symbol, which indicates to the C program that the strerror_r() routine is available.

d_strftime

From d_strftime.U:

This variable conditionally defines the "HAS_STRFTIME" symbol, which indicates to the C program that the strftime() routine is available.

d_strlcat

From d_strlcat.U:

This variable conditionally defines the "HAS_STRLCAT" symbol, which indicates to the C program that the strlcat () routine is available.

d_strlcpy

From d_strlcpy.U:

This variable conditionally defines the "HAS_STRLCPY" symbol, which indicates to the C program that the strlcpy () routine is available.

d_strtod

From d_strtod.U:

This variable conditionally defines the "HAS_STRTOD" symbol, which indicates to the C program that the strtod() routine is available to provide better numeric string conversion than atof().

d_strtol

From d_strtol.U:

This variable conditionally defines the "HAS_STRTOL" symbol, which indicates to the C program that the strtol() routine is available to provide better numeric string conversion than atoi() and friends.

d_strtold

From d_strtold.U:

This variable conditionally defines the "HAS_STRTOLD" symbol, which indicates to the C program that the strtold() routine is available.

d_strtoll

From d_strtoll.U:

This variable conditionally defines the "HAS_STRTOLL" symbol, which indicates to the C program that the strtoll() routine is available.

d_strtoq

From d_strtoq.U:

This variable conditionally defines the "HAS_STRTOQ" symbol, which indicates to the C program that the strtoq() routine is available.

d_strtoul

From d_strtoul.U:

This variable conditionally defines the "HAS_STRTOUL" symbol, which indicates to the C program that the strtoul() routine is available to provide conversion of strings to unsigned long.

d_strtoull

From d_strtoull.U:

This variable conditionally defines the "HAS_STRTOULL" symbol, which indicates to the C program that the strtoull() routine is available.

d_strtouq

From d_strtouq.U:

This variable conditionally defines the "HAS_STRTOUQ" symbol, which indicates to the C program that the strtouq() routine is available.

d_strxfrm

From d_strxfrm.U:

This variable conditionally defines "HAS_STRXFRM" if strxfrm() is available to transform strings.

d_suidsafe

From d_dosuid.U:

This variable conditionally defines "SETUID_SCRIPTS_ARE_SECURE_NOW" if setuid scripts can be secure. This test looks in /dev/fd/.

d_symlink

From d_symlink.U:

This variable conditionally defines the "HAS_SYMLINK" symbol, which indicates to the C program that the symlink() routine is available to create symbolic links.

d_syscall

From d_syscall.U:

This variable conditionally defines "HAS_SYSCALL" if syscall() is available call arbitrary system calls.

d_syscallproto

From d_syscallproto.U:

This variable conditionally defines the "HAS_SYSCALL_PROTO" symbol, which indicates to the C program that the system provides a prototype for the syscall() function. Otherwise, it is up to the program to supply one.

d_sysconf

From d_sysconf.U:

This variable conditionally defines the "HAS_SYSCONF" symbol, which indicates to the C program that the sysconf() routine is available to determine system related limits and options.

d_sysernlst

From d_strerror.U:

This variable conditionally defines "HAS_SYS_ERRNOLIST" if sys_errnolist[] is available to translate error numbers to the symbolic name.

d_syserrlst

From d_strerror.U:

This variable conditionally defines "HAS_SYS_ERRLIST" if sys_errlist[] is available to translate error numbers to strings.

d_system

From d_system.U:

This variable conditionally defines "HAS_SYSTEM" if system() is available to issue a shell command.

d_tcgetpgrp

From d_tcgtpgrp.U:

This variable conditionally defines the "HAS_TCGETPGRP" symbol, which indicates to the C program that the tcgetpgrp() routine is available. to get foreground process group "ID".

d_tcsetpgrp

From d_tcstpgrp.U:

This variable conditionally defines the "HAS_TCSETPGRP" symbol, which indicates to the C program that the tcsetpgrp() routine is available to set foreground process group "ID".

d_telldir

From d_readdir.U:

This variable conditionally defines "HAS_TELLDIR" if telldir() is available.

d_telldirproto

From d_telldirproto.U:

This variable conditionally defines the "HAS_TELLDIR_PROTO" symbol, which indicates to the C program that the system provides a prototype for the telldir() function. Otherwise, it is up to the program to supply one.

d_tgamma

From d_tgamma.U:

This variable conditionally defines the "HAS_TGAMMA" symbol, which indicates to the C program that the tgamma() routine is available for the gamma function. See also d_lgamma.

d_time

From d_time.U:

This variable conditionally defines the "HAS_TIME" symbol, which indicates that the time() routine exists. The time() routine is normally provided on "UNIX" systems.

d_timegm

From d_timegm.U:

This variable conditionally defines the "HAS_TIMEGM" symbol, which indicates to the C program that the timegm () routine is available.

d_times

From d_times.U:

This variable conditionally defines the "HAS_TIMES" symbol, which indicates that the times() routine exists. The times() routine is normally provided on "UNIX" systems. You may have to include <sys/times.h>.

d_tm_tm_gmtoff

From i_time.U:

This variable conditionally defines "HAS_TM_TM_GMTOFF", which indicates indicates to the C program that the struct tm has the tm_gmtoff field.

d_tm_tm_zone

From i_time.U:

This variable conditionally defines "HAS_TM_TM_ZONE", which indicates indicates to the C program that the struct tm has the tm_zone field.

d_tmpnam_r

From d_tmpnam_r.U:

This variable conditionally defines the "HAS_TMPNAM_R" symbol, which indicates to the C program that the tmpnam_r() routine is available.

d_trunc

From d_trunc.U:

This variable conditionally defines the "HAS_TRUNC" symbol, which indicates to the C program that the trunc() routine is available to round doubles towards zero.

d_truncate

From d_truncate.U:

This variable conditionally defines "HAS_TRUNCATE" if truncate() is available to truncate files.

d_truncl

From d_truncl.U:

This variable conditionally defines the "HAS_TRUNCL" symbol, which indicates to the C program that the truncl() routine is available to round long doubles towards zero. If copysignl is also present, we can emulate modfl.

d_ttyname_r

From d_ttyname_r.U:

This variable conditionally defines the "HAS_TTYNAME_R" symbol, which indicates to the C program that the ttyname_r() routine is available.

d_tzname

From d_tzname.U:

This variable conditionally defines "HAS_TZNAME" if tzname[] is available to access timezone names.

d_u32align

From d_u32align.U:

This variable tells whether you must access character data through U32-aligned pointers.

d_ualarm

From d_ualarm.U:

This variable conditionally defines the "HAS_UALARM" symbol, which indicates to the C program that the ualarm() routine is available.

d_umask

From d_umask.U:

This variable conditionally defines the "HAS_UMASK" symbol, which indicates to the C program that the umask() routine is available. to set and get the value of the file creation mask.

d_uname

From d_gethname.U:

This variable conditionally defines the "HAS_UNAME" symbol, which indicates to the C program that the uname() routine may be used to derive the host name.

d_union_semun

From d_union_semun.U:

This variable conditionally defines "HAS_UNION_SEMUN" if the union semun is defined by including <sys/sem.h>.

d_unordered

From d_unordered.U:

This variable conditionally defines the "HAS_UNORDERED" symbol, which indicates to the C program that the unordered() routine is available.

d_unsetenv

From d_unsetenv.U:

This variable conditionally defines the "HAS_UNSETENV" symbol, which indicates to the C program that the unsetenv () routine is available.

d_usleep

From d_usleep.U:

This variable conditionally defines "HAS_USLEEP" if usleep() is available to do high granularity sleeps.

d_usleepproto

From d_usleepproto.U:

This variable conditionally defines the "HAS_USLEEP_PROTO" symbol, which indicates to the C program that the system provides a prototype for the usleep() function. Otherwise, it is up to the program to supply one.

d_ustat

From d_ustat.U:

This variable conditionally defines "HAS_USTAT" if ustat() is available to query file system statistics by dev_t.

d_vendorarch

From vendorarch.U:

This variable conditionally defined "PERL_VENDORARCH".

d_vendorbin

From vendorbin.U:

This variable conditionally defines "PERL_VENDORBIN".

d_vendorlib

From vendorlib.U:

This variable conditionally defines "PERL_VENDORLIB".

d_vendorscript

From vendorscript.U:

This variable conditionally defines "PERL_VENDORSCRIPT".

d_vfork

From d_vfork.U:

This variable conditionally defines the "HAS_VFORK" symbol, which indicates the vfork() routine is available.

d_void_closedir

From d_closedir.U:

This variable conditionally defines "VOID_CLOSEDIR" if closedir() does not return a value.

d_voidsig

From d_voidsig.U:

This variable conditionally defines "VOIDSIG" if this system declares ``void (*signal(...))()'' in signal.h. The old way was to declare it as ``int (*signal(...))()''.

d_voidtty

From i_sysioctl.U:

This variable conditionally defines "USE_IOCNOTTY" to indicate that the ioctl() call with "TIOCNOTTY" should be used to void tty association. Otherwise (on "USG" probably), it is enough to close the standard file descriptors and do a setpgrp().

d_volatile

From d_volatile.U:

This variable conditionally defines the "HASVOLATILE" symbol, which indicates to the C program that this C compiler knows about the volatile declaration.

d_vprintf

From d_vprintf.U:

This variable conditionally defines the "HAS_VPRINTF" symbol, which indicates to the C program that the vprintf() routine is available to printf with a pointer to an argument list.

d_vsnprintf

From d_snprintf.U:

This variable conditionally defines the "HAS_VSNPRINTF" symbol, which indicates to the C program that the vsnprintf () library function is available.

d_wait4

From d_wait4.U:

This variable conditionally defines the

HAS_WAIT4

symbol, which indicates the wait4() routine is available.

d_waitpid

From d_waitpid.U:

This variable conditionally defines "HAS_WAITPID" if waitpid() is available to wait for child process.

d_wcscmp

From d_wcscmp.U:

This variable conditionally defines the "HAS_WCSCMP" symbol if the wcscmp() routine is available and can be used to compare wide character strings.

d_wcstombs

From d_wcstombs.U:

This variable conditionally defines the "HAS_WCSTOMBS" symbol, which indicates to the C program that the wcstombs() routine is available to convert wide character strings to multibyte strings.

d_wcsxfrm

From d_wcsxfrm.U:

This variable conditionally defines the "HAS_WCSXFRM" symbol if the wcsxfrm() routine is available and can be used to compare wide character strings.

d_wctomb

From d_wctomb.U:

This variable conditionally defines the "HAS_WCTOMB" symbol, which indicates to the C program that the wctomb() routine is available to convert a wide character to a multibyte.

d_writev

From d_writev.U:

This variable conditionally defines the "HAS_WRITEV" symbol, which indicates to the C program that the writev() routine is available.

d_xenix

From Guess.U:

This variable conditionally defines the symbol "XENIX", which alerts the C program that it runs under Xenix.

date

From Loc.U:

This variable is used internally by Configure to determine the full pathname (if any) of the date program. After Configure runs, the value is reset to a plain "date" and is not useful.

db_hashtype

From i_db.U:

This variable contains the type of the hash structure element in the <db.h> header file. In older versions of "DB", it was int, while in newer ones it is u_int32_t.

db_prefixtype

From i_db.U:

This variable contains the type of the prefix structure element in the <db.h> header file. In older versions of "DB", it was int, while in newer ones it is size_t.

db_version_major

From i_db.U:

This variable contains the major version number of Berkeley "DB" found in the <db.h> header file.

db_version_minor

From i_db.U:

This variable contains the minor version number of Berkeley "DB" found in the <db.h> header file. For "DB" version 1 this is always 0.

db_version_patch

From i_db.U:

This variable contains the patch version number of Berkeley "DB" found in the <db.h> header file. For "DB" version 1 this is always 0.

direntrytype

From i_dirent.U:

This symbol is set to "struct direct" or "struct dirent" depending on whether dirent is available or not. You should use this pseudo type to portably declare your directory entries.

dlext

From dlext.U:

This variable contains the extension that is to be used for the dynamically loaded modules that perl generates.

dlsrc

From dlsrc.U:

This variable contains the name of the dynamic loading file that will be used with the package.

doublekind

From longdblfio.U:

This variable, if defined, encodes the type of a double: 1 = "IEEE" 754 32-bit big little endian, 2 = "IEEE" 754 32-bit big big endian, 3 = "IEEE" 754 64-bit big little endian, 4 = "IEEE" 754 64-bit big big endian, 5 = "IEEE" 754 128-bit big little endian, 6 = "IEEE" 754 128-bit big big endian, 7 = "IEEE" 754 64-bit big mixed endian le-be, 8 = "IEEE" 754 64-bit big mixed endian be-le, -1 = unknown format.

doublesize

From doublesize.U:

This variable contains the value of the "DOUBLESIZE" symbol, which indicates to the C program how many bytes there are in a double.

drand01

From randfunc.U:

Indicates the macro to be used to generate normalized random numbers. Uses randfunc, often divided by (double) (((unsigned long) 1 << randbits)) in order to normalize the result. In C programs, the macro "Drand01" is mapped to drand01.

drand48_r_proto

From d_drand48_r.U:

This variable encodes the prototype of drand48_r. It is zero if d_drand48_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_drand48_r is defined.

dtrace

From usedtrace.U:

This variable holds the location of the dtrace executable.

dynamic_ext

From Extensions.U:

This variable holds a list of "XS" extension files we want to link dynamically into the package. It is used by Makefile.

e

eagain: From nblock_io.U:
This variable bears the symbolic errno code set by read() when no data is present on the file and non-blocking I/O was enabled (otherwise, read() blocks naturally).
ebcdic: From ebcdic.U:
This variable conditionally defines "EBCDIC" if this system uses "EBCDIC" encoding.
echo: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the echo program. After Configure runs, the value is reset to a plain "echo" and is not useful.
egrep: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the egrep program. After Configure runs, the value is reset to a plain "egrep" and is not useful.
emacs: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
endgrent_r_proto: From d_endgrent_r.U:
This variable encodes the prototype of endgrent_r. It is zero if d_endgrent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endgrent_r is defined.
endhostent_r_proto: From d_endhostent_r.U:
This variable encodes the prototype of endhostent_r. It is zero if d_endhostent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endhostent_r is defined.
endnetent_r_proto: From d_endnetent_r.U:
This variable encodes the prototype of endnetent_r. It is zero if d_endnetent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endnetent_r is defined.
endprotoent_r_proto: From d_endprotoent_r.U:
This variable encodes the prototype of endprotoent_r. It is zero if d_endprotoent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endprotoent_r is defined.
endpwent_r_proto: From d_endpwent_r.U:
This variable encodes the prototype of endpwent_r. It is zero if d_endpwent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endpwent_r is defined.
endservent_r_proto: From d_endservent_r.U:
This variable encodes the prototype of endservent_r. It is zero if d_endservent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endservent_r is defined.
eunicefix: From Init.U:
When running under Eunice this variable contains a command which will convert a shell script to the proper form of text file for it to be executable by the shell. On other systems it is a no-op.
exe_ext: From Unix.U:
This is an old synonym for _exe.
expr: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the expr program. After Configure runs, the value is reset to a plain "expr" and is not useful.
extensions: From Extensions.U:
This variable holds a list of all extension files (both "XS" and non-xs) installed with the package. It is propagated to Config.pm and is typically used to test whether a particular extension is available.
extern_C: From Csym.U:
"ANSI" C requires "extern" where C
++
requires 'extern "C"'. This variable can be used in Configure to do the right thing.
extras: From Extras.U:
This variable holds a list of extra modules to install.

f

fflushall: From fflushall.U:
This symbol, if defined, tells that to flush all pending stdio output one must loop through all the stdio file handles stored in an array and fflush them. Note that if fflushNULL is defined, fflushall will not even be probed for and will be left undefined.
fflushNULL: From fflushall.U:
This symbol, if defined, tells that fflush("NULL") correctly flushes all pending stdio output without side effects. In particular, on some platforms calling fflush("NULL") *still* corrupts "STDIN" if it is a pipe.
find: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
firstmakefile: From Unix.U:
This variable defines the first file searched by make. On unix, it is makefile (then Makefile). On case-insensitive systems, it might be something else. This is only used to deal with convoluted make depend tricks.
flex: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
fpossize: From fpossize.U:
This variable contains the size of a fpostype in bytes.
fpostype: From fpostype.U:
This variable defines Fpos_t to be something like fpos_t, long, uint, or whatever type is used to declare file positions in libc.
freetype: From mallocsrc.U:
This variable contains the return type of free(). It is usually void, but occasionally int.
from: From Cross.U:
This variable contains the command used by Configure to copy files from the target host. Useful and available only during Perl build. The string ":" if not cross-compiling.
full_ar: From Loc_ar.U:
This variable contains the full pathname to "ar", whether or not the user has specified "portability". This is only used in the Makefile.SH.
full_csh: From d_csh.U:
This variable contains the full pathname to "csh", whether or not the user has specified "portability". This is only used in the compiled C program, and we assume that all systems which can share this executable will have the same full pathname to csh.
full_sed: From Loc_sed.U:
This variable contains the full pathname to "sed", whether or not the user has specified "portability". This is only used in the compiled C program, and we assume that all systems which can share this executable will have the same full pathname to sed.

g

gccansipedantic: From gccvers.U:
If "GNU" cc (gcc) is used, this variable will enable (if set) the -ansi and -pedantic ccflags for building core files (through cflags script). (See Porting/pumpkin.pod for full description).
gccosandvers: From gccvers.U:
If "GNU" cc (gcc) is used, this variable holds the operating system and version used to compile gcc. It is set to '' if not gcc, or if nothing useful can be parsed as the os version.
gccversion: From gccvers.U:
If "GNU" cc (gcc) is used, this variable holds 1 or 2 to indicate whether the compiler is version 1 or 2. This is used in setting some of the default cflags. It is set to '' if not gcc.
getgrent_r_proto: From d_getgrent_r.U:
This variable encodes the prototype of getgrent_r. It is zero if d_getgrent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgrent_r is defined.
getgrgid_r_proto: From d_getgrgid_r.U:
This variable encodes the prototype of getgrgid_r. It is zero if d_getgrgid_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgrgid_r is defined.
getgrnam_r_proto: From d_getgrnam_r.U:
This variable encodes the prototype of getgrnam_r. It is zero if d_getgrnam_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getgrnam_r is defined.
gethostbyaddr_r_proto: From d_gethostbyaddr_r.U:
This variable encodes the prototype of gethostbyaddr_r. It is zero if d_gethostbyaddr_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gethostbyaddr_r is defined.
gethostbyname_r_proto: From d_gethostbyname_r.U:
This variable encodes the prototype of gethostbyname_r. It is zero if d_gethostbyname_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gethostbyname_r is defined.
gethostent_r_proto: From d_gethostent_r.U:
This variable encodes the prototype of gethostent_r. It is zero if d_gethostent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gethostent_r is defined.
getlogin_r_proto: From d_getlogin_r.U:
This variable encodes the prototype of getlogin_r. It is zero if d_getlogin_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getlogin_r is defined.
getnetbyaddr_r_proto: From d_getnetbyaddr_r.U:
This variable encodes the prototype of getnetbyaddr_r. It is zero if d_getnetbyaddr_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getnetbyaddr_r is defined.
getnetbyname_r_proto: From d_getnetbyname_r.U:
This variable encodes the prototype of getnetbyname_r. It is zero if d_getnetbyname_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getnetbyname_r is defined.
getnetent_r_proto: From d_getnetent_r.U:
This variable encodes the prototype of getnetent_r. It is zero if d_getnetent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getnetent_r is defined.
getprotobyname_r_proto: From d_getprotobyname_r.U:
This variable encodes the prototype of getprotobyname_r. It is zero if d_getprotobyname_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getprotobyname_r is defined.
getprotobynumber_r_proto: From d_getprotobynumber_r.U:
This variable encodes the prototype of getprotobynumber_r. It is zero if d_getprotobynumber_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getprotobynumber_r is defined.
getprotoent_r_proto: From d_getprotoent_r.U:
This variable encodes the prototype of getprotoent_r. It is zero if d_getprotoent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getprotoent_r is defined.
getpwent_r_proto: From d_getpwent_r.U:
This variable encodes the prototype of getpwent_r. It is zero if d_getpwent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpwent_r is defined.
getpwnam_r_proto: From d_getpwnam_r.U:
This variable encodes the prototype of getpwnam_r. It is zero if d_getpwnam_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpwnam_r is defined.
getpwuid_r_proto: From d_getpwuid_r.U:
This variable encodes the prototype of getpwuid_r. It is zero if d_getpwuid_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getpwuid_r is defined.
getservbyname_r_proto: From d_getservbyname_r.U:
This variable encodes the prototype of getservbyname_r. It is zero if d_getservbyname_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getservbyname_r is defined.
getservbyport_r_proto: From d_getservbyport_r.U:
This variable encodes the prototype of getservbyport_r. It is zero if d_getservbyport_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getservbyport_r is defined.
getservent_r_proto: From d_getservent_r.U:
This variable encodes the prototype of getservent_r. It is zero if d_getservent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getservent_r is defined.
getspnam_r_proto: From d_getspnam_r.U:
This variable encodes the prototype of getspnam_r. It is zero if d_getspnam_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_getspnam_r is defined.
gidformat: From gidf.U:
This variable contains the format string used for printing a Gid_t.
gidsign: From gidsign.U:
This variable contains the signedness of a gidtype. 1 for unsigned, -1 for signed.
gidsize: From gidsize.U:
This variable contains the size of a gidtype in bytes.
gidtype: From gidtype.U:
This variable defines Gid_t to be something like gid_t, int, ushort, or whatever type is used to declare the return type of getgid(). Typically, it is the type of group ids in the kernel.
glibpth: From libpth.U:
This variable holds the general path (space-separated) used to find libraries. It may contain directories that do not exist on this platform, libpth is the cleaned-up version.
gmake: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the gmake program. After Configure runs, the value is reset to a plain "gmake" and is not useful.
gmtime_r_proto: From d_gmtime_r.U:
This variable encodes the prototype of gmtime_r. It is zero if d_gmtime_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_gmtime_r is defined.
gnulibc_version: From d_gnulibc.U:
This variable contains the version number of the "GNU" C library. It is usually something like 2.2.5. It is a plain '' if this is not the "GNU" C library, or if the version is unknown.
grep: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the grep program. After Configure runs, the value is reset to a plain "grep" and is not useful.
groupcat: From nis.U:
This variable contains a command that produces the text of the /etc/group file. This is normally "cat /etc/group``, but can be ''ypcat group" when "NIS" is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset.
groupstype: From groupstype.U:
This variable defines Groups_t to be something like gid_t, int, ushort, or whatever type is used for the second argument to getgroups() and setgroups(). Usually, this is the same as gidtype (gid_t), but sometimes it isn't.
gzip: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the gzip program. After Configure runs, the value is reset to a plain "gzip" and is not useful.

h

h_fcntl: From h_fcntl.U:
This is variable gets set in various places to tell i_fcntl that <fcntl.h> should be included.
h_sysfile: From h_sysfile.U:
This is variable gets set in various places to tell i_sys_file that <sys/file.h> should be included.
hint: From Oldconfig.U:
Gives the type of hints used for previous answers. May be one of "default", "recommended" or "previous".
hostcat: From nis.U:
This variable contains a command that produces the text of the /etc/hosts file. This is normally "cat /etc/hosts``, but can be ''ypcat hosts" when "NIS" is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset.
hostgenerate: From Cross.U:
This variable contains the path to a generate_uudmap binary that can be run on the host "OS" when cross-compiling. Useful and available only during Perl build. Empty string '' if not cross-compiling.
hostosname: From Cross.U:
This variable contains the original value of $^O for hostperl when cross-compiling. This is useful to pick the proper tools when running build code in the host. Empty string '' if not cross-compiling.
hostperl: From Cross.U:
This variable contains the path to a miniperl binary that can be run on the host "OS" when cross-compiling. Useful and available only during Perl build. Empty string '' if not cross-compiling.
html1dir: From html1dir.U:
This variable contains the name of the directory in which html source pages are to be put. This directory is for pages that describe whole programs, not libraries or modules. It is intended to correspond roughly to section 1 of the Unix manuals.
html1direxp: From html1dir.U:
This variable is the same as the html1dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
html3dir: From html3dir.U:
This variable contains the name of the directory in which html source pages are to be put. This directory is for pages that describe libraries or modules. It is intended to correspond roughly to section 3 of the Unix manuals.
html3direxp: From html3dir.U:
This variable is the same as the html3dir variable, but is filename expanded at configuration time, for convenient use in makefiles.

i

i16size

From perlxv.U:

This variable is the size of an I16 in bytes.

i16type

From perlxv.U:

This variable contains the C type used for Perl's I16.

i32size

From perlxv.U:

This variable is the size of an I32 in bytes.

i32type

From perlxv.U:

This variable contains the C type used for Perl's I32.

i64size

From perlxv.U:

This variable is the size of an I64 in bytes.

i64type

From perlxv.U:

This variable contains the C type used for Perl's I64.

i8size

From perlxv.U:

This variable is the size of an I8 in bytes.

i8type

From perlxv.U:

This variable contains the C type used for Perl's I8.

i_arpainet

From i_arpainet.U:

This variable conditionally defines the "I_ARPA_INET" symbol, and indicates whether a C program should include <arpa/inet.h>.

i_assert

From i_assert.U:

This variable conditionally defines the "I_ASSERT" symbol, which indicates to the C program that <assert.h> exists and could be included.

i_bfd

From i_bfd.U:

This variable conditionally defines the "I_BFD" symbol, and indicates whether a C program can include <bfd.h>.

i_bsdioctl

From i_sysioctl.U:

This variable conditionally defines the "I_SYS_BSDIOCTL" symbol, which indicates to the C program that <sys/bsdioctl.h> exists and should be included.

i_crypt

From i_crypt.U:

This variable conditionally defines the "I_CRYPT" symbol, and indicates whether a C program should include <crypt.h>.

i_db

From i_db.U:

This variable conditionally defines the "I_DB" symbol, and indicates whether a C program may include Berkeley's "DB" include file <db.h>.

i_dbm

From i_dbm.U:

This variable conditionally defines the "I_DBM" symbol, which indicates to the C program that <dbm.h> exists and should be included.

i_dirent

From i_dirent.U:

This variable conditionally defines "I_DIRENT", which indicates to the C program that it should include <dirent.h>.

i_dlfcn

From i_dlfcn.U:

This variable conditionally defines the "I_DLFCN" symbol, which indicates to the C program that <dlfcn.h> exists and should be included.

i_execinfo

From i_execinfo.U:

This variable conditionally defines the "I_EXECINFO" symbol, and indicates whether a C program may include <execinfo.h>, for backtrace() support.

i_fcntl

From i_fcntl.U:

This variable controls the value of "I_FCNTL" (which tells the C program to include <fcntl.h>).

i_fenv

From i_fenv.U:

This variable conditionally defines the "I_FENV" symbol, which indicates to the C program that <fenv.h> exists and should be included.

i_float

From i_float.U:

This variable conditionally defines the "I_FLOAT" symbol, and indicates whether a C program may include <float.h> to get symbols like "DBL_MAX" or "DBL_MIN", i.e. machine dependent floating point values.

i_fp

From i_fp.U:

This variable conditionally defines the "I_FP" symbol, and indicates whether a C program should include <fp.h>.

i_fp_class

From i_fp_class.U:

This variable conditionally defines the "I_FP_CLASS" symbol, and indicates whether a C program should include <fp_class.h>.

i_gdbm

From i_gdbm.U:

This variable conditionally defines the "I_GDBM" symbol, which indicates to the C program that <gdbm.h> exists and should be included.

i_gdbm_ndbm

From i_ndbm.U:

This variable conditionally defines the "I_GDBM_NDBM" symbol, which indicates to the C program that <gdbm-ndbm.h> exists and should be included. This is the location of the ndbm.h compatibility file in Debian 4.0.

i_gdbmndbm

From i_ndbm.U:

This variable conditionally defines the "I_GDBMNDBM" symbol, which indicates to the C program that <gdbm/ndbm.h> exists and should be included. This was the location of the ndbm.h compatibility file in RedHat 7.1.

i_grp

From i_grp.U:

This variable conditionally defines the "I_GRP" symbol, and indicates whether a C program should include <grp.h>.

i_ieeefp

From i_ieeefp.U:

This variable conditionally defines the "I_IEEEFP" symbol, and indicates whether a C program should include <ieeefp.h>.

i_inttypes

From i_inttypes.U:

This variable conditionally defines the "I_INTTYPES" symbol, and indicates whether a C program should include <inttypes.h>.

i_langinfo

From i_langinfo.U:

This variable conditionally defines the "I_LANGINFO" symbol, and indicates whether a C program should include <langinfo.h>.

i_libutil

From i_libutil.U:

This variable conditionally defines the "I_LIBUTIL" symbol, and indicates whether a C program should include <libutil.h>.

i_limits

From i_limits.U:

This variable conditionally defines the "I_LIMITS" symbol, and indicates whether a C program may include <limits.h> to get symbols like "WORD_BIT" and friends.

i_locale

From i_locale.U:

This variable conditionally defines the "I_LOCALE" symbol, and indicates whether a C program should include <locale.h>.

i_machcthr

From i_machcthr.U:

This variable conditionally defines the "I_MACH_CTHREADS" symbol, and indicates whether a C program should include <mach/cthreads.h>.

i_malloc

From i_malloc.U:

This variable conditionally defines the "I_MALLOC" symbol, and indicates whether a C program should include <malloc.h>.

i_mallocmalloc

From i_mallocmalloc.U:

This variable conditionally defines the "I_MALLOCMALLOC" symbol, and indicates whether a C program should include <malloc/malloc.h>.

i_math

From i_math.U:

This variable conditionally defines the "I_MATH" symbol, and indicates whether a C program may include <math.h>.

i_memory

From i_memory.U:

This variable conditionally defines the "I_MEMORY" symbol, and indicates whether a C program should include <memory.h>.

i_mntent

From i_mntent.U:

This variable conditionally defines the "I_MNTENT" symbol, and indicates whether a C program should include <mntent.h>.

i_ndbm

From i_ndbm.U:

This variable conditionally defines the "I_NDBM" symbol, which indicates to the C program that <ndbm.h> exists and should be included.

i_netdb

From i_netdb.U:

This variable conditionally defines the "I_NETDB" symbol, and indicates whether a C program should include <netdb.h>.

i_neterrno

From i_neterrno.U:

This variable conditionally defines the "I_NET_ERRNO" symbol, which indicates to the C program that <net/errno.h> exists and should be included.

i_netinettcp

From i_netinettcp.U:

This variable conditionally defines the "I_NETINET_TCP" symbol, and indicates whether a C program should include <netinet/tcp.h>.

i_niin

From i_niin.U:

This variable conditionally defines "I_NETINET_IN", which indicates to the C program that it should include <netinet/in.h>. Otherwise, you may try <sys/in.h>.

i_poll

From i_poll.U:

This variable conditionally defines the "I_POLL" symbol, and indicates whether a C program should include <poll.h>.

i_prot

From i_prot.U:

This variable conditionally defines the "I_PROT" symbol, and indicates whether a C program should include <prot.h>.

i_pthread

From i_pthread.U:

This variable conditionally defines the "I_PTHREAD" symbol, and indicates whether a C program should include <pthread.h>.

i_pwd

From i_pwd.U:

This variable conditionally defines "I_PWD", which indicates to the C program that it should include <pwd.h>.

i_quadmath

From i_quadmath.U:

This variable conditionally defines "I_QUADMATH", which indicates to the C program that it should include <quadmath.h>.

i_rpcsvcdbm

From i_dbm.U:

This variable conditionally defines the "I_RPCSVC_DBM" symbol, which indicates to the C program that <rpcsvc/dbm.h> exists and should be included. Some System V systems might need this instead of <dbm.h>.

i_sgtty

From i_termio.U:

This variable conditionally defines the "I_SGTTY" symbol, which indicates to the C program that it should include <sgtty.h> rather than <termio.h>.

i_shadow

From i_shadow.U:

This variable conditionally defines the "I_SHADOW" symbol, and indicates whether a C program should include <shadow.h>.

i_socks

From i_socks.U:

This variable conditionally defines the "I_SOCKS" symbol, and indicates whether a C program should include <socks.h>.

i_stdarg

From i_varhdr.U:

This variable conditionally defines the "I_STDARG" symbol, which indicates to the C program that <stdarg.h> exists and should be included.

i_stdbool

From i_stdbool.U:

This variable conditionally defines the "I_STDBOOL" symbol, which indicates to the C program that <stdbool.h> exists and should be included.

i_stddef

From i_stddef.U:

This variable conditionally defines the "I_STDDEF" symbol, which indicates to the C program that <stddef.h> exists and should be included.

i_stdint

From i_stdint.U:

This variable conditionally defines the "I_STDINT" symbol, which indicates to the C program that <stdint.h> exists and should be included.

i_stdlib

From i_stdlib.U:

This variable conditionally defines the "I_STDLIB" symbol, which indicates to the C program that <stdlib.h> exists and should be included.

i_string

From i_string.U:

This variable conditionally defines the "I_STRING" symbol, which indicates that <string.h> should be included rather than <strings.h>.

i_sunmath

From i_sunmath.U:

This variable conditionally defines the "I_SUNMATH" symbol, and indicates whether a C program should include <sunmath.h>.

i_sysaccess

From i_sysaccess.U:

This variable conditionally defines the "I_SYS_ACCESS" symbol, and indicates whether a C program should include <sys/access.h>.

i_sysdir

From i_sysdir.U:

This variable conditionally defines the "I_SYS_DIR" symbol, and indicates whether a C program should include <sys/dir.h>.

i_sysfile

From i_sysfile.U:

This variable conditionally defines the "I_SYS_FILE" symbol, and indicates whether a C program should include <sys/file.h> to get "R_OK" and friends.

i_sysfilio

From i_sysioctl.U:

This variable conditionally defines the "I_SYS_FILIO" symbol, which indicates to the C program that <sys/filio.h> exists and should be included in preference to <sys/ioctl.h>.

i_sysin

From i_niin.U:

This variable conditionally defines "I_SYS_IN", which indicates to the C program that it should include <sys/in.h> instead of <netinet/in.h>.

i_sysioctl

From i_sysioctl.U:

This variable conditionally defines the "I_SYS_IOCTL" symbol, which indicates to the C program that <sys/ioctl.h> exists and should be included.

i_syslog

From i_syslog.U:

This variable conditionally defines the "I_SYSLOG" symbol, and indicates whether a C program should include <syslog.h>.

i_sysmman

From i_sysmman.U:

This variable conditionally defines the "I_SYS_MMAN" symbol, and indicates whether a C program should include <sys/mman.h>.

i_sysmode

From i_sysmode.U:

This variable conditionally defines the "I_SYSMODE" symbol, and indicates whether a C program should include <sys/mode.h>.

i_sysmount

From i_sysmount.U:

This variable conditionally defines the "I_SYSMOUNT" symbol, and indicates whether a C program should include <sys/mount.h>.

i_sysndir

From i_sysndir.U:

This variable conditionally defines the "I_SYS_NDIR" symbol, and indicates whether a C program should include <sys/ndir.h>.

i_sysparam

From i_sysparam.U:

This variable conditionally defines the "I_SYS_PARAM" symbol, and indicates whether a C program should include <sys/param.h>.

i_syspoll

From i_syspoll.U:

This variable conditionally defines the "I_SYS_POLL" symbol, which indicates to the C program that it should include <sys/poll.h>.

i_sysresrc

From i_sysresrc.U:

This variable conditionally defines the "I_SYS_RESOURCE" symbol, and indicates whether a C program should include <sys/resource.h>.

i_syssecrt

From i_syssecrt.U:

This variable conditionally defines the "I_SYS_SECURITY" symbol, and indicates whether a C program should include <sys/security.h>.

i_sysselct

From i_sysselct.U:

This variable conditionally defines "I_SYS_SELECT", which indicates to the C program that it should include <sys/select.h> in order to get the definition of struct timeval.

i_syssockio

From i_sysioctl.U:

This variable conditionally defines "I_SYS_SOCKIO" to indicate to the C program that socket ioctl codes may be found in <sys/sockio.h> instead of <sys/ioctl.h>.

i_sysstat

From i_sysstat.U:

This variable conditionally defines the "I_SYS_STAT" symbol, and indicates whether a C program should include <sys/stat.h>.

i_sysstatfs

From i_sysstatfs.U:

This variable conditionally defines the "I_SYSSTATFS" symbol, and indicates whether a C program should include <sys/statfs.h>.

i_sysstatvfs

From i_sysstatvfs.U:

This variable conditionally defines the "I_SYSSTATVFS" symbol, and indicates whether a C program should include <sys/statvfs.h>.

i_systime

From i_time.U:

This variable conditionally defines "I_SYS_TIME", which indicates to the C program that it should include <sys/time.h>.

i_systimek

From i_time.U:

This variable conditionally defines "I_SYS_TIME_KERNEL", which indicates to the C program that it should include <sys/time.h> with "KERNEL" defined.

i_systimes

From i_systimes.U:

This variable conditionally defines the "I_SYS_TIMES" symbol, and indicates whether a C program should include <sys/times.h>.

i_systypes

From i_systypes.U:

This variable conditionally defines the "I_SYS_TYPES" symbol, and indicates whether a C program should include <sys/types.h>.

i_sysuio

From i_sysuio.U:

This variable conditionally defines the "I_SYSUIO" symbol, and indicates whether a C program should include <sys/uio.h>.

i_sysun

From i_sysun.U:

This variable conditionally defines "I_SYS_UN", which indicates to the C program that it should include <sys/un.h> to get "UNIX" domain socket definitions.

i_sysutsname

From i_sysutsname.U:

This variable conditionally defines the "I_SYSUTSNAME" symbol, and indicates whether a C program should include <sys/utsname.h>.

i_sysvfs

From i_sysvfs.U:

This variable conditionally defines the "I_SYSVFS" symbol, and indicates whether a C program should include <sys/vfs.h>.

i_syswait

From i_syswait.U:

This variable conditionally defines "I_SYS_WAIT", which indicates to the C program that it should include <sys/wait.h>.

i_termio

From i_termio.U:

This variable conditionally defines the "I_TERMIO" symbol, which indicates to the C program that it should include <termio.h> rather than <sgtty.h>.

i_termios

From i_termio.U:

This variable conditionally defines the "I_TERMIOS" symbol, which indicates to the C program that the "POSIX" <termios.h> file is to be included.

i_time

From i_time.U:

This variable conditionally defines "I_TIME", which indicates to the C program that it should include <time.h>.

i_unistd

From i_unistd.U:

This variable conditionally defines the "I_UNISTD" symbol, and indicates whether a C program should include <unistd.h>.

i_ustat

From i_ustat.U:

This variable conditionally defines the "I_USTAT" symbol, and indicates whether a C program should include <ustat.h>.

i_utime

From i_utime.U:

This variable conditionally defines the "I_UTIME" symbol, and indicates whether a C program should include <utime.h>.

i_values

From i_values.U:

This variable conditionally defines the "I_VALUES" symbol, and indicates whether a C program may include <values.h> to get symbols like "MAXLONG" and friends.

i_varargs

From i_varhdr.U:

This variable conditionally defines "I_VARARGS", which indicates to the C program that it should include <varargs.h>.

i_varhdr

From i_varhdr.U:

Contains the name of the header to be included to get va_dcl definition. Typically one of varargs.h or stdarg.h.

i_vfork

From i_vfork.U:

This variable conditionally defines the "I_VFORK" symbol, and indicates whether a C program should include vfork.h.

ignore_versioned_solibs

From libs.U:

This variable should be non-empty if non-versioned shared libraries (libfoo.so.x.y) are to be ignored (because they cannot be linked against).

inc_version_list

From inc_version_list.U:

This variable specifies the list of subdirectories in over which perl.c:incpush() and lib/lib.pm will automatically search when adding directories to @"INC". The elements in the list are separated by spaces. This is only useful if you have a perl library directory tree structured like the default one. See "INSTALL" for how this works. The versioned site_perl directory was introduced in 5.005, so that is the lowest possible value.

This list includes architecture-dependent directories back to version $api_versionstring (e.g. 5.5.640) and architecture-independent directories all the way back to 5.005.

inc_version_list_init

From inc_version_list.U:

This variable holds the same list as inc_version_list, but each item is enclosed in double quotes and separated by commas, suitable for use in the "PERL_INC_VERSION_LIST" initialization.

incpath

From usrinc.U:

This variable must precede the normal include path to get the right one, as in $incpath/usr/include or $incpath/usr/lib. Value can be "" or /bsd43 on mips.

incpth

From libpth.U:

This variable must precede the normal include path to get the right one, as in $incpath/usr/include or $incpath/usr/lib. Value can be "" or /bsd43 on mips.

inews

From Loc.U:

This variable is defined but not used by Configure. The value is the empty string and is not useful.

initialinstalllocation

From bin.U:

When userelocatableinc is true, this variable holds the location that make install should copy the perl binary to, with all the run-time relocatable paths calculated from this at install time. When used, it is initialized to the original value of binexp, and then binexp is set to .../, as the other binaries are found relative to the perl binary.

installarchlib

From archlib.U:

This variable is really the same as archlibexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installbin

From bin.U:

This variable is the same as binexp unless "AFS" is running in which case the user is explicitly prompted for it. This variable should always be used in your makefiles for maximum portability.

installhtml1dir

From html1dir.U:

This variable is really the same as html1direxp, unless you are using a different installprefix. For extra portability, you should only use this variable within your makefiles.

installhtml3dir

From html3dir.U:

This variable is really the same as html3direxp, unless you are using a different installprefix. For extra portability, you should only use this variable within your makefiles.

installman1dir

From man1dir.U:

This variable is really the same as man1direxp, unless you are using "AFS" in which case it points to the read/write location whereas man1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles.

installman3dir

From man3dir.U:

This variable is really the same as man3direxp, unless you are using "AFS" in which case it points to the read/write location whereas man3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles.

installprefix

From installprefix.U:

This variable holds the name of the directory below which ``make install'' will install the package. For most users, this is the same as prefix. However, it is useful for installing the software into a different (usually temporary) location after which it can be bundled up and moved somehow to the final location specified by prefix.

installprefixexp

From installprefix.U:

This variable holds the full absolute path of installprefix with all ~-expansion done.

installprivlib

From privlib.U:

This variable is really the same as privlibexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installscript

From scriptdir.U:

This variable is usually the same as scriptdirexp, unless you are on a system running "AFS", in which case they may differ slightly. You should always use this variable within your makefiles for portability.

installsitearch

From sitearch.U:

This variable is really the same as sitearchexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installsitebin

From sitebin.U:

This variable is usually the same as sitebinexp, unless you are on a system running "AFS", in which case they may differ slightly. You should always use this variable within your makefiles for portability.

installsitehtml1dir

From sitehtml1dir.U:

This variable is really the same as sitehtml1direxp, unless you are using "AFS" in which case it points to the read/write location whereas html1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles.

installsitehtml3dir

From sitehtml3dir.U:

This variable is really the same as sitehtml3direxp, unless you are using "AFS" in which case it points to the read/write location whereas html3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles.

installsitelib

From sitelib.U:

This variable is really the same as sitelibexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installsiteman1dir

From siteman1dir.U:

This variable is really the same as siteman1direxp, unless you are using "AFS" in which case it points to the read/write location whereas man1direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles.

installsiteman3dir

From siteman3dir.U:

This variable is really the same as siteman3direxp, unless you are using "AFS" in which case it points to the read/write location whereas man3direxp only points to the read-only access location. For extra portability, you should only use this variable within your makefiles.

installsitescript

From sitescript.U:

This variable is usually the same as sitescriptexp, unless you are on a system running "AFS", in which case they may differ slightly. You should always use this variable within your makefiles for portability.

installstyle

From installstyle.U:

This variable describes the "style" of the perl installation. This is intended to be useful for tools that need to manipulate entire perl distributions. Perl itself doesn't use this to find its libraries --- the library directories are stored directly in Config.pm. Currently, there are only two styles: "lib" and lib/perl5. The default library locations (e.g. privlib, sitelib) are either $prefix/lib or $prefix/lib/perl5. The former is useful if $prefix is a directory dedicated to perl (e.g. /opt/perl), while the latter is useful if $prefix is shared by many packages, e.g. if $prefix=/usr/local.

Unfortunately, while this "style" variable is used to set defaults for all three directory hierarchies (core, vendor, and site), there is no guarantee that the same style is actually appropriate for all those directories. For example, $prefix might be /opt/perl, but $siteprefix might be /usr/local. (Perhaps, in retrospect, the "lib" style should never have been supported, but it did seem like a nice idea at the time.)

The situation is even less clear for tools such as MakeMaker that can be used to install additional modules into non-standard places. For example, if a user intends to install a module into a private directory (perhaps by setting "PREFIX" on the Makefile.PL command line), then there is no reason to assume that the Configure-time $installstyle setting will be relevant for that "PREFIX".

This may later be extended to include other information, so be careful with pattern-matching on the results.

For compatibility with perl5.005 and earlier, the default setting is based on whether or not $prefix contains the string "perl".

installusrbinperl

From instubperl.U:

This variable tells whether Perl should be installed also as /usr/bin/perl in addition to $installbin/perl

installvendorarch

From vendorarch.U:

This variable is really the same as vendorarchexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorbin

From vendorbin.U:

This variable is really the same as vendorbinexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorhtml1dir

From vendorhtml1dir.U:

This variable is really the same as vendorhtml1direxp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorhtml3dir

From vendorhtml3dir.U:

This variable is really the same as vendorhtml3direxp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorlib

From vendorlib.U:

This variable is really the same as vendorlibexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorman1dir

From vendorman1dir.U:

This variable is really the same as vendorman1direxp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorman3dir

From vendorman3dir.U:

This variable is really the same as vendorman3direxp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

installvendorscript

From vendorscript.U:

This variable is really the same as vendorscriptexp but may differ on those systems using "AFS". For extra portability, only this variable should be used in makefiles.

intsize

From intsize.U:

This variable contains the value of the "INTSIZE" symbol, which indicates to the C program how many bytes there are in an int.

issymlink

From issymlink.U:

This variable holds the test command to test for a symbolic link (if they are supported). Typical values include "test -h" and "test -L".

ivdformat

From perlxvf.U:

This variable contains the format string used for printing a Perl "IV" as a signed decimal integer.

ivsize

From perlxv.U:

This variable is the size of an "IV" in bytes.

ivtype

From perlxv.U:

This variable contains the C type used for Perl's "IV".

k

known_extensions: From Extensions.U:
This variable holds a list of all extensions (both "XS" and non-xs) included in the package source distribution. This information is only really of use during the Perl build, as the list makes no distinction between extensions which were build and installed, and those which where not. See "extensions" for the list of extensions actually built and available.
ksh: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.

l

ld: From dlsrc.U:
This variable indicates the program to be used to link libraries for dynamic loading. On some systems, it is "ld". On "ELF" systems, it should be $cc. Mostly, we'll try to respect the hint file setting.
ld_can_script: From dlsrc.U:
This variable shows if the loader accepts scripts in the form of -Wl,--version-script=ld.script. This is currently only supported for "GNU" ld on "ELF" in dynamic loading builds.
lddlflags: From dlsrc.U:
This variable contains any special flags that might need to be passed to $ld to create a shared library suitable for dynamic loading. It is up to the makefile to use it. For hpux, it should be "-b". For sunos 4.1, it is empty.
ldflags: From ccflags.U:
This variable contains any additional C loader flags desired by the user. It is up to the Makefile to use this.
ldflags_uselargefiles: From uselfs.U:
This variable contains the loader flags needed by large file builds and added to ldflags by hints files.
ldlibpthname: From libperl.U:
This variable holds the name of the shared library search path, often "LD_LIBRARY_PATH". To get an empty string, the hints file must set this to "none".
less: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the less program. After Configure runs, the value is reset to a plain "less" and is not useful.
lib_ext: From Unix.U:
This is an old synonym for _a.
libc: From libc.U:
This variable contains the location of the C library.
libperl: From libperl.U:
The perl executable is obtained by linking perlmain.c with libperl, any static extensions (usually just DynaLoader), and any other libraries needed on this system. libperl is usually libperl.a, but can also be libperl.so.xxx if the user wishes to build a perl executable with a shared library.
libpth: From libpth.U:
This variable holds the general path (space-separated) used to find libraries. It is intended to be used by other units.
libs: From libs.U:
This variable holds the additional libraries we want to use. It is up to the Makefile to deal with it. The list can be empty.
libsdirs: From libs.U:
This variable holds the directory names aka dirnames of the libraries we found and accepted, duplicates are removed.
libsfiles: From libs.U:
This variable holds the filenames aka basenames of the libraries we found and accepted.
libsfound: From libs.U:
This variable holds the full pathnames of the libraries we found and accepted.
libspath: From libs.U:
This variable holds the directory names probed for libraries.
libswanted: From Myinit.U:
This variable holds a list of all the libraries we want to search. The order is chosen to pick up the c library ahead of ucb or bsd libraries for
SVR4.
libswanted_uselargefiles: From uselfs.U:
This variable contains the libraries needed by large file builds and added to ldflags by hints files. It is a space separated list of the library names without the "lib" prefix or any suffix, just like libswanted..
line: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
lint: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
lkflags: From ccflags.U:
This variable contains any additional C partial linker flags desired by the user. It is up to the Makefile to use this.
ln: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the ln program. After Configure runs, the value is reset to a plain "ln" and is not useful.
lns: From lns.U:
This variable holds the name of the command to make symbolic links (if they are supported). It can be used in the Makefile. It is either "ln -s" or "ln"
localtime_r_proto: From d_localtime_r.U:
This variable encodes the prototype of localtime_r. It is zero if d_localtime_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_localtime_r is defined.
locincpth: From ccflags.U:
This variable contains a list of additional directories to be searched by the compiler. The appropriate "-I" directives will be added to ccflags. This is intended to simplify setting local directories from the Configure command line. It's not much, but it parallels the loclibpth stuff in libpth.U.
loclibpth: From libpth.U:
This variable holds the paths (space-separated) used to find local libraries. It is prepended to libpth, and is intended to be easily set from the command line.
longdblkind: From d_longdbl.U:
This variable, if defined, encodes the type of a long double: 0 = double, 1 = "IEEE" 754 128-bit big little endian, 2 = "IEEE" 754 128-bit big big endian, 3 = x86 80-bit little endian, 4 = x86 80-bit big endian, 5 = double-double 128-bit little endian, 6 = double-double 128-bit big endian, -1 = unknown format.
longdblsize: From d_longdbl.U:
This variable contains the value of the "LONG_DOUBLESIZE" symbol, which indicates to the C program how many bytes there are in a long double, if this system supports long doubles. Note that this is sizeof(long double), which may include unused bytes.
longlongsize: From d_longlong.U:
This variable contains the value of the "LONGLONGSIZE" symbol, which indicates to the C program how many bytes there are in a long long, if this system supports long long.
longsize: From intsize.U:
This variable contains the value of the "LONGSIZE" symbol, which indicates to the C program how many bytes there are in a long.
lp: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
lpr: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
ls: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the ls program. After Configure runs, the value is reset to a plain "ls" and is not useful.
lseeksize: From lseektype.U:
This variable defines lseektype to be something like off_t, long, or whatever type is used to declare lseek offset's type in the kernel (which also appears to be lseek's return type).
lseektype: From lseektype.U:
This variable defines lseektype to be something like off_t, long, or whatever type is used to declare lseek offset's type in the kernel (which also appears to be lseek's return type).

m

mail

From Loc.U:

This variable is defined but not used by Configure. The value is the empty string and is not useful.

mailx

From Loc.U:

This variable is defined but not used by Configure. The value is the empty string and is not useful.

make

From Loc.U:

This variable is used internally by Configure to determine the full pathname (if any) of the make program. After Configure runs, the value is reset to a plain "make" and is not useful.

make_set_make

From make.U:

Some versions of "make" set the variable "MAKE". Others do not. This variable contains the string to be included in Makefile.SH so that "MAKE" is set if needed, and not if not needed. Possible values are:

make_set_make="#" # If your make program handles this for you,

make_set_make="MAKE=$make" # if it doesn't.

This uses a comment character so that we can distinguish a "set" value (from a previous config.sh or Configure "-D" option) from an uncomputed value.

mallocobj

From mallocsrc.U:

This variable contains the name of the malloc.o that this package generates, if that malloc.o is preferred over the system malloc. Otherwise the value is null. This variable is intended for generating Makefiles. See mallocsrc.

mallocsrc

From mallocsrc.U:

This variable contains the name of the malloc.c that comes with the package, if that malloc.c is preferred over the system malloc. Otherwise the value is null. This variable is intended for generating Makefiles.

malloctype

From mallocsrc.U:

This variable contains the kind of ptr returned by malloc and realloc.

man1dir

From man1dir.U:

This variable contains the name of the directory in which manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself.

man1direxp

From man1dir.U:

This variable is the same as the man1dir variable, but is filename expanded at configuration time, for convenient use in makefiles.

man1ext

From man1dir.U:

This variable contains the extension that the manual page should have: one of "n", "l", or 1. The Makefile must supply the .. See man1dir.

man3dir

From man3dir.U:

man3direxp

From man3dir.U:

This variable is the same as the man3dir variable, but is filename expanded at configuration time, for convenient use in makefiles.

man3ext

From man3dir.U:

This variable contains the extension that the manual page should have: one of "n", "l", or 3. The Makefile must supply the .. See man3dir.

mips_type

From usrinc.U:

This variable holds the environment type for the mips system. Possible values are ``

BSD 4.3''

and ``System V''.

mistrustnm

From Csym.U:

This variable can be used to establish a fallthrough for the cases where nm fails to find a symbol. If usenm is false or usenm is true and mistrustnm is false, this variable has no effect. If usenm is true and mistrustnm is "compile", a test program will be compiled to try to find any symbol that can't be located via nm lookup. If mistrustnm is "run", the test program will be run as well as being compiled.

mkdir

From Loc.U:

This variable is used internally by Configure to determine the full pathname (if any) of the mkdir program. After Configure runs, the value is reset to a plain "mkdir" and is not useful.

mmaptype

From d_mmap.U:

This symbol contains the type of pointer returned by mmap() (and simultaneously the type of the first argument). It can be "void *" or "caddr_t".

modetype

From modetype.U:

This variable defines modetype to be something like mode_t, int, unsigned short, or whatever type is used to declare file modes for system calls.

more

From Loc.U:

This variable is used internally by Configure to determine the full pathname (if any) of the more program. After Configure runs, the value is reset to a plain "more" and is not useful.

multiarch

From multiarch.U:

This variable conditionally defines the "MULTIARCH" symbol which signifies the presence of multiplatform files. This is normally set by hints files.

mv

From Loc.U:

This variable is defined but not used by Configure. The value is the empty string and is not useful.

myarchname

From archname.U:

This variable holds the architecture name computed by Configure in a previous run. It is not intended to be perused by any user and should never be set in a hint file.

mydomain

From myhostname.U:

This variable contains the eventual value of the "MYDOMAIN" symbol, which is the domain of the host the program is going to run on. The domain must be appended to myhostname to form a complete host name. The dot comes with mydomain, and need not be supplied by the program.

myhostname

From myhostname.U:

This variable contains the eventual value of the "MYHOSTNAME" symbol, which is the name of the host the program is going to run on. The domain is not kept with hostname, but must be gotten from mydomain. The dot comes with mydomain, and need not be supplied by the program.

myuname

From Oldconfig.U:

The output of "uname -a" if available, otherwise the hostname. The whole thing is then lower-cased and slashes and single quotes are removed.

n

n: From n.U:
This variable contains the "-n" flag if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is $echo $n ``prompt for a question: $c''.
need_va_copy: From need_va_copy.U:
This symbol, if defined, indicates that the system stores the variable argument list datatype, va_list, in a format that cannot be copied by simple assignment, so that some other means must be used when copying is required. As such systems vary in their provision (or non-provision) of copying mechanisms, handy.h defines a platform- "independent" macro, Perl_va_copy(src, dst), to do the job.
netdb_hlen_type: From netdbtype.U:
This variable holds the type used for the 2nd argument to gethostbyaddr(). Usually, this is int or size_t or unsigned. This is only useful if you have gethostbyaddr(), naturally.
netdb_host_type: From netdbtype.U:
This variable holds the type used for the 1st argument to gethostbyaddr(). Usually, this is char * or void *, possibly with or without a const prefix. This is only useful if you have gethostbyaddr(), naturally.
netdb_name_type: From netdbtype.U:
This variable holds the type used for the argument to gethostbyname(). Usually, this is char * or const char *. This is only useful if you have gethostbyname(), naturally.
netdb_net_type: From netdbtype.U:
This variable holds the type used for the 1st argument to getnetbyaddr(). Usually, this is int or long. This is only useful if you have getnetbyaddr(), naturally.
nm: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the nm program. After Configure runs, the value is reset to a plain "nm" and is not useful.
nm_opt: From usenm.U:
This variable holds the options that may be necessary for nm.
nm_so_opt: From usenm.U:
This variable holds the options that may be necessary for nm to work on a shared library but that can not be used on an archive library. Currently, this is only used by Linux, where nm --dynamic is *required* to get symbols from an "ELF" library which has been stripped, but nm --dynamic is *fatal* on an archive library. Maybe Linux should just always set usenm=false.
nonxs_ext: From Extensions.U:
This variable holds a list of all non-xs extensions built and installed by the package. By default, all non-xs extensions distributed will be built, with the exception of platform-specific extensions (currently only one "VMS" specific extension).
nroff: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the nroff program. After Configure runs, the value is reset to a plain "nroff" and is not useful.
nv_overflows_integers_at: From perlxv.U:
This variable gives the largest integer value that NVs can hold as a constant floating point expression. If it could not be determined, it holds the value 0.
nv_preserves_uv_bits: From perlxv.U:
This variable indicates how many of bits type uvtype a variable nvtype can preserve.
nveformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "NV" using %e-ish floating point format.
nvEUformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "NV" using %E-ish floating point format.
nvfformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "NV" using %f-ish floating point format.
nvFUformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "NV" using %F-ish floating point format.
nvgformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "NV" using %g-ish floating point format.
nvGUformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "NV" using %G-ish floating point format.
nvsize: From perlxv.U:
This variable is the size of a Perl "NV" in bytes. Note that some floating point formats have unused bytes.
nvtype: From perlxv.U:
This variable contains the C type used for Perl's "NV".

o

o_nonblock: From nblock_io.U:
This variable bears the symbol value to be used during open() or fcntl() to turn on non-blocking I/O for a file descriptor. If you wish to switch between blocking and non-blocking, you may try ioctl("FIOSNBIO") instead, but that is only supported by some devices.
obj_ext: From Unix.U:
This is an old synonym for _o.
old_pthread_create_joinable: From d_pthrattrj.U:
This variable defines the constant to use for creating joinable (aka undetached) pthreads. Unused if pthread.h defines "PTHREAD_CREATE_JOINABLE". If used, possible values are "PTHREAD_CREATE_UNDETACHED" and "__UNDETACHED".
optimize: From ccflags.U:
This variable contains any optimizer/debugger flag that should be used. It is up to the Makefile to use it.
orderlib: From orderlib.U:
This variable is "true" if the components of libraries must be ordered (with `lorder $* | tsort`) before placing them in an archive. Set to "false" if ranlib or ar can generate random libraries.
osname: From Oldconfig.U:
This variable contains the operating system name (e.g. sunos, solaris, hpux, etc.). It can be useful later on for setting defaults. Any spaces are replaced with underscores. It is set to a null string if we can't figure it out.
osvers: From Oldconfig.U:
This variable contains the operating system version (e.g. 4.1.3, 5.2, etc.). It is primarily used for helping select an appropriate hints file, but might be useful elsewhere for setting defaults. It is set to '' if we can't figure it out. We try to be flexible about how much of the version number to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the same for this package, hints files might just be os_4.0 or os_4.1, etc., not keeping separate files for each little release.
otherlibdirs: From otherlibdirs.U:
This variable contains a colon-separated set of paths for the perl binary to search for additional library files or modules. These directories will be tacked to the end of @"INC". Perl will automatically search below each path for version- and architecture-specific directories. See inc_version_list for more details. A value of " " means "none" and is used to preserve this value for the next run through Configure.

p

package: From package.U:
This variable contains the name of the package being constructed. It is primarily intended for the use of later Configure units.
pager: From pager.U:
This variable contains the name of the preferred pager on the system. Usual values are (the full pathnames of) more, less, pg, or cat.
passcat: From nis.U:
This variable contains a command that produces the text of the /etc/passwd file. This is normally "cat /etc/passwd``, but can be ''ypcat passwd" when "NIS" is used. On some systems, such as os390, there may be no equivalent command, in which case this variable is unset.
patchlevel: From patchlevel.U:
The patchlevel level of this package. The value of patchlevel comes from the patchlevel.h file. In a version number such as 5.6.1, this is the 6. In patchlevel.h, this is referred to as "PERL_VERSION".
path_sep: From Unix.U:
This is an old synonym for p_ in Head.U, the character used to separate elements in the command shell search "PATH".
perl: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the perl program. After Configure runs, the value is reset to a plain "perl" and is not useful.
perl5: From perl5.U:
This variable contains the full path (if any) to a previously installed perl5.005 or later suitable for running the script to determine inc_version_list.

P

PERL_API_REVISION: From patchlevel.h:
This number describes the earliest compatible "PERL_REVISION" of Perl ("compatibility" here being defined as sufficient binary/"API" compatibility to run "XS" code built with the older version). Normally this does not change across maintenance releases. Please read the comment in patchlevel.h.
PERL_API_SUBVERSION: From patchlevel.h:
This number describes the earliest compatible "PERL_SUBVERSION" of Perl ("compatibility" here being defined as sufficient binary/"API" compatibility to run "XS" code built with the older version). Normally this does not change across maintenance releases. Please read the comment in patchlevel.h.
PERL_API_VERSION: From patchlevel.h:
This number describes the earliest compatible "PERL_VERSION" of Perl ("compatibility" here being defined as sufficient binary/"API" compatibility to run "XS" code built with the older version). Normally this does not change across maintenance releases. Please read the comment in patchlevel.h.
PERL_CONFIG_SH: From Oldsyms.U:
This is set to "true" in config.sh so that a shell script sourcing config.sh can tell if it has been sourced already.
PERL_PATCHLEVEL: From Oldsyms.U:
This symbol reflects the patchlevel, if available. Will usually come from the .patch file, which is available when the perl source tree was fetched with rsync.
perl_patchlevel: From patchlevel.U:
This is the Perl patch level, a numeric change identifier, as defined by whichever source code maintenance system is used to maintain the patches; currently Perforce. It does not correlate with the Perl version numbers or the maintenance versus development dichotomy except by also being increasing.
PERL_REVISION: From Oldsyms.U:
In a Perl version number such as 5.6.2, this is the 5. This value is manually set in patchlevel.h
perl_static_inline: From d_static_inline.U:
This variable defines the "PERL_STATIC_INLINE" symbol to the best-guess incantation to use for static inline functions. Possibilities include static inline (c99) static __inline__ (gcc -ansi) static __inline ("MSVC") static _inline (older "MSVC") static (c89 compilers)
PERL_SUBVERSION: From Oldsyms.U:
In a Perl version number such as 5.6.2, this is the 2. Values greater than 50 represent potentially unstable development subversions. This value is manually set in patchlevel.h
PERL_VERSION: From Oldsyms.U:
In a Perl version number such as 5.6.2, this is the 6. This value is manually set in patchlevel.h
perladmin: From perladmin.U:
Electronic mail address of the perl5 administrator.
perllibs: From End.U:
The list of libraries needed by Perl only (any libraries needed by extensions only will by dropped, if using dynamic loading).
perlpath: From perlpath.U:
This variable contains the eventual value of the "PERLPATH" symbol, which contains the name of the perl interpreter to be used in shell scripts and in the "eval "exec"" idiom. This variable is not necessarily the pathname of the file containing the perl interpreter; you must append the executable extension (_exe) if it is not already present. Note that Perl code that runs during the Perl build process cannot reference this variable, as Perl may not have been installed, or even if installed, may be a different version of Perl.
pg: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the pg program. After Configure runs, the value is reset to a plain "pg" and is not useful.
phostname: From myhostname.U:
This variable contains the eventual value of the "PHOSTNAME" symbol, which is a command that can be fed to popen() to get the host name. The program should probably not presume that the domain is or isn't there already.
pidtype: From pidtype.U:
This variable defines "PIDTYPE" to be something like pid_t, int, ushort, or whatever type is used to declare process ids in the kernel.
plibpth: From libpth.U:
Holds the private path used by Configure to find out the libraries. Its value is prepend to libpth. This variable takes care of special machines, like the mips. Usually, it should be empty.
pmake: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
pr: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
prefix: From prefix.U:
This variable holds the name of the directory below which the user will install the package. Usually, this is /usr/local, and executables go in /usr/local/bin, library stuff in /usr/local/lib, man pages in /usr/local/man, etc. It is only used to set defaults for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.
prefixexp: From prefix.U:
This variable holds the full absolute path of the directory below which the user will install the package. Derived from prefix.
privlib: From privlib.U:
This variable contains the eventual value of the "PRIVLIB" symbol, which is the name of the private library for this package. It may have a ~ on the front. It is up to the makefile to eventually create this directory while performing installation (with ~ substitution).
privlibexp: From privlib.U:
This variable is the ~name expanded version of privlib, so that you may use it directly in Makefiles or shell scripts.
procselfexe: From d_procselfexe.U:
If d_procselfexe is defined, $procselfexe is the filename of the symbolic link pointing to the absolute pathname of the executing program.
prototype: From prototype.U:
This variable holds the eventual value of "CAN_PROTOTYPE", which indicates the C compiler can handle function prototypes.
ptrsize: From ptrsize.U:
This variable contains the value of the "PTRSIZE" symbol, which indicates to the C program how many bytes there are in a pointer.

q

quadkind: From quadtype.U:
This variable, if defined, encodes the type of a quad: 1 = int, 2 = long, 3 = long long, 4 = int64_t.
quadtype: From quadtype.U:
This variable defines Quad_t to be something like long, int, long long, int64_t, or whatever type is used for 64-bit integers.

r

randbits: From randfunc.U:
Indicates how many bits are produced by the function used to generate normalized random numbers.
randfunc: From randfunc.U:
Indicates the name of the random number function to use. Values include drand48, random, and rand. In C programs, the "Drand01" macro is defined to generate uniformly distributed random numbers over the range [0., 1.[ (see drand01 and nrand).
random_r_proto: From d_random_r.U:
This variable encodes the prototype of random_r. It is zero if d_random_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_random_r is defined.
randseedtype: From randfunc.U:
Indicates the type of the argument of the seedfunc.
ranlib: From orderlib.U:
This variable is set to the pathname of the ranlib program, if it is needed to generate random libraries. Set to ":" if ar can generate random libraries or if random libraries are not supported
rd_nodata: From nblock_io.U:
This variable holds the return code from read() when no data is present. It should be -1, but some systems return 0 when "O_NDELAY" is used, which is a shame because you cannot make the difference between no data and an
EOF.
. Sigh!
readdir64_r_proto: From d_readdir64_r.U:
This variable encodes the prototype of readdir64_r. It is zero if d_readdir64_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_readdir64_r is defined.
readdir_r_proto: From d_readdir_r.U:
This variable encodes the prototype of readdir_r. It is zero if d_readdir_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_readdir_r is defined.
revision: From patchlevel.U:
The value of revision comes from the patchlevel.h file. In a version number such as 5.6.1, this is the 5. In patchlevel.h, this is referred to as "PERL_REVISION".
rm: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the rm program. After Configure runs, the value is reset to a plain "rm" and is not useful.
rm_try: From Unix.U:
This is a cleanup variable for try test programs. Internal Configure use only.
rmail: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
run: From Cross.U:
This variable contains the command used by Configure to copy and execute a cross-compiled executable in the target host. Useful and available only during Perl build. Empty string '' if not cross-compiling.
runnm: From usenm.U:
This variable contains "true" or "false" depending whether the nm extraction should be performed or not, according to the value of usenm and the flags on the Configure command line.

s

sched_yield: From d_pthread_y.U:
This variable defines the way to yield the execution of the current thread.
scriptdir: From scriptdir.U:
This variable holds the name of the directory in which the user wants to put publicly scripts for the package in question. It is either the same directory as for binaries, or a special one that can be mounted across different architectures, like /usr/share. Programs must be prepared to deal with ~name expansion.
scriptdirexp: From scriptdir.U:
This variable is the same as scriptdir, but is filename expanded at configuration time, for programs not wanting to bother with it.
sed: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the sed program. After Configure runs, the value is reset to a plain "sed" and is not useful.
seedfunc: From randfunc.U:
Indicates the random number generating seed function. Values include srand48, srandom, and srand.
selectminbits: From selectminbits.U:
This variable holds the minimum number of bits operated by select. That is, if you do select(n, ...), how many bits at least will be cleared in the masks if some activity is detected. Usually this is either n or 32*ceil(n/32), especially many little-endians do the latter. This is only useful if you have select(), naturally.
selecttype: From selecttype.U:
This variable holds the type used for the 2nd, 3rd, and 4th arguments to select. Usually, this is "fd_set *", if "HAS_FD_SET" is defined, and "int *" otherwise. This is only useful if you have select(), naturally.
sendmail: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
setgrent_r_proto: From d_setgrent_r.U:
This variable encodes the prototype of setgrent_r. It is zero if d_setgrent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setgrent_r is defined.
sethostent_r_proto: From d_sethostent_r.U:
This variable encodes the prototype of sethostent_r. It is zero if d_sethostent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_sethostent_r is defined.
setlocale_r_proto: From d_setlocale_r.U:
This variable encodes the prototype of setlocale_r. It is zero if d_setlocale_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setlocale_r is defined.
setnetent_r_proto: From d_setnetent_r.U:
This variable encodes the prototype of setnetent_r. It is zero if d_setnetent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setnetent_r is defined.
setprotoent_r_proto: From d_setprotoent_r.U:
This variable encodes the prototype of setprotoent_r. It is zero if d_setprotoent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setprotoent_r is defined.
setpwent_r_proto: From d_setpwent_r.U:
This variable encodes the prototype of setpwent_r. It is zero if d_setpwent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setpwent_r is defined.
setservent_r_proto: From d_setservent_r.U:
This variable encodes the prototype of setservent_r. It is zero if d_setservent_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_setservent_r is defined.
sGMTIME_max: From time_size.U:
This variable defines the maximum value of the time_t offset that the system function gmtime () accepts
sGMTIME_min: From time_size.U:
This variable defines the minimum value of the time_t offset that the system function gmtime () accepts
sh: From sh.U:
This variable contains the full pathname of the shell used on this system to execute Bourne shell scripts. Usually, this will be /bin/sh, though it's possible that some systems will have /bin/ksh, /bin/pdksh, /bin/ash, /bin/bash, or even something such as D:/bin/sh.exe. This unit comes before Options.U, so you can't set sh with a "-D" option, though you can override this (and startsh) with "-O -Dsh=/bin/whatever -Dstartsh=whatever"
shar: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
sharpbang: From spitshell.U:
This variable contains the string #! if this system supports that construct.
shmattype: From d_shmat.U:
This symbol contains the type of pointer returned by shmat(). It can be "void *" or "char *".
shortsize: From intsize.U:
This variable contains the value of the "SHORTSIZE" symbol which indicates to the C program how many bytes there are in a short.
shrpenv: From libperl.U:
If the user builds a shared libperl.so, then we need to tell the "perl" executable where it will be able to find the installed libperl.so. One way to do this on some systems is to set the environment variable "LD_RUN_PATH" to the directory that will be the final location of the shared libperl.so. The makefile can use this with something like $shrpenv $("CC") -o perl perlmain.o $libperl $libs Typical values are shrpenv="env "LD_RUN_PATH"=$archlibexp/"CORE"" or shrpenv='' See the main perl Makefile.SH for actual working usage. Alternatively, we might be able to use a command line option such as -R $archlibexp/"CORE" (Solaris) or -Wl,-rpath $archlibexp/"CORE" (Linux).
shsharp: From spitshell.U:
This variable tells further Configure units whether your sh can handle # comments.
sig_count: From sig_name.U:
This variable holds a number larger than the largest valid signal number. This is usually the same as the "NSIG" macro.
sig_name: From sig_name.U:
This variable holds the signal names, space separated. The leading "SIG" in signal name is removed. A "ZERO" is prepended to the list. This is currently not used, sig_name_init is used instead.
sig_name_init: From sig_name.U:
This variable holds the signal names, enclosed in double quotes and separated by commas, suitable for use in the "SIG_NAME" definition below. A "ZERO" is prepended to the list, and the list is terminated with a plain 0. The leading "SIG" in signal names is removed. See sig_num.
sig_num: From sig_name.U:
This variable holds the signal numbers, space separated. A "ZERO" is prepended to the list (corresponding to the fake "SIGZERO"). Those numbers correspond to the value of the signal listed in the same place within the sig_name list. This is currently not used, sig_num_init is used instead.
sig_num_init: From sig_name.U:
This variable holds the signal numbers, enclosed in double quotes and separated by commas, suitable for use in the "SIG_NUM" definition below. A "ZERO" is prepended to the list, and the list is terminated with a plain 0.
sig_size: From sig_name.U:
This variable contains the number of elements of the sig_name and sig_num arrays.
signal_t: From d_voidsig.U:
This variable holds the type of the signal handler (void or int).
sitearch: From sitearch.U:
This variable contains the eventual value of the "SITEARCH" symbol, which is the name of the private library for this package. It may have a ~ on the front. It is up to the makefile to eventually create this directory while performing installation (with ~ substitution). The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local architecture-dependent modules in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
sitearchexp: From sitearch.U:
This variable is the ~name expanded version of sitearch, so that you may use it directly in Makefiles or shell scripts.
sitebin: From sitebin.U:
This variable holds the name of the directory in which the user wants to put add-on publicly executable files for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local executables in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
sitebinexp: From sitebin.U:
This is the same as the sitebin variable, but is filename expanded at configuration time, for use in your makefiles.
sitehtml1dir: From sitehtml1dir.U:
This variable contains the name of the directory in which site-specific html source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local html pages in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
sitehtml1direxp: From sitehtml1dir.U:
This variable is the same as the sitehtml1dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
sitehtml3dir: From sitehtml3dir.U:
This variable contains the name of the directory in which site-specific library html source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local library html pages in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
sitehtml3direxp: From sitehtml3dir.U:
This variable is the same as the sitehtml3dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
sitelib: From sitelib.U:
This variable contains the eventual value of the "SITELIB" symbol, which is the name of the private library for this package. It may have a ~ on the front. It is up to the makefile to eventually create this directory while performing installation (with ~ substitution). The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local architecture-independent modules in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
sitelib_stem: From sitelib.U:
This variable is $sitelibexp with any trailing version-specific component removed. The elements in inc_version_list (inc_version_list.U) can be tacked onto this variable to generate a list of directories to search.
sitelibexp: From sitelib.U:
This variable is the ~name expanded version of sitelib, so that you may use it directly in Makefiles or shell scripts.
siteman1dir: From siteman1dir.U:
This variable contains the name of the directory in which site-specific manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local man1 pages in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
siteman1direxp: From siteman1dir.U:
This variable is the same as the siteman1dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
siteman3dir: From siteman3dir.U:
This variable contains the name of the directory in which site-specific library man source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local man3 pages in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
siteman3direxp: From siteman3dir.U:
This variable is the same as the siteman3dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
siteprefix: From siteprefix.U:
This variable holds the full absolute path of the directory below which the user will install add-on packages. See "INSTALL" for usage and examples.
siteprefixexp: From siteprefix.U:
This variable holds the full absolute path of the directory below which the user will install add-on packages. Derived from siteprefix.
sitescript: From sitescript.U:
This variable holds the name of the directory in which the user wants to put add-on publicly executable files for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution. The standard distribution will put nothing in this directory. After perl has been installed, users may install their own local scripts in this directory with MakeMaker Makefile.PL or equivalent. See "INSTALL" for details.
sitescriptexp: From sitescript.U:
This is the same as the sitescript variable, but is filename expanded at configuration time, for use in your makefiles.
sizesize: From sizesize.U:
This variable contains the size of a sizetype in bytes.
sizetype: From sizetype.U:
This variable defines sizetype to be something like size_t, unsigned long, or whatever type is used to declare length parameters for string functions.
sleep: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
sLOCALTIME_max: From time_size.U:
This variable defines the maximum value of the time_t offset that the system function localtime () accepts
sLOCALTIME_min: From time_size.U:
This variable defines the minimum value of the time_t offset that the system function localtime () accepts
smail: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
so: From so.U:
This variable holds the extension used to identify shared libraries (also known as shared objects) on the system. Usually set to "so".
sockethdr: From d_socket.U:
This variable has any cpp "-I" flags needed for socket support.
socketlib: From d_socket.U:
This variable has the names of any libraries needed for socket support.
socksizetype: From socksizetype.U:
This variable holds the type used for the size argument for various socket calls like accept. Usual values include socklen_t, size_t, and int.
sort: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the sort program. After Configure runs, the value is reset to a plain "sort" and is not useful.
spackage: From package.U:
This variable contains the name of the package being constructed, with the first letter uppercased, i.e. suitable for starting sentences.
spitshell: From spitshell.U:
This variable contains the command necessary to spit out a runnable shell on this system. It is either cat or a grep "-v" for # comments.
sPRId64: From quadfio.U:
This variable, if defined, contains the string used by stdio to format 64-bit decimal numbers (format "d") for output.
sPRIeldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "e") for output.
sPRIEUldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "E") for output. The "U" in the name is to separate this from sPRIeldbl so that even case-blind systems can see the difference.
sPRIfldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "f") for output.
sPRIFUldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "F") for output. The "U" in the name is to separate this from sPRIfldbl so that even case-blind systems can see the difference.
sPRIgldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "g") for output.
sPRIGUldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "G") for output. The "U" in the name is to separate this from sPRIgldbl so that even case-blind systems can see the difference.
sPRIi64: From quadfio.U:
This variable, if defined, contains the string used by stdio to format 64-bit decimal numbers (format "i") for output.
sPRIo64: From quadfio.U:
This variable, if defined, contains the string used by stdio to format 64-bit octal numbers (format "o") for output.
sPRIu64: From quadfio.U:
This variable, if defined, contains the string used by stdio to format 64-bit unsigned decimal numbers (format "u") for output.
sPRIx64: From quadfio.U:
This variable, if defined, contains the string used by stdio to format 64-bit hexadecimal numbers (format "x") for output.
sPRIXU64: From quadfio.U:
This variable, if defined, contains the string used by stdio to format 64-bit hExADECimAl numbers (format "X") for output. The "U" in the name is to separate this from sPRIx64 so that even case-blind systems can see the difference.
srand48_r_proto: From d_srand48_r.U:
This variable encodes the prototype of srand48_r. It is zero if d_srand48_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_srand48_r is defined.
srandom_r_proto: From d_srandom_r.U:
This variable encodes the prototype of srandom_r. It is zero if d_srandom_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_srandom_r is defined.
src: From src.U:
This variable holds the (possibly relative) path of the package source. It is up to the Makefile to use this variable and set "VPATH" accordingly to find the sources remotely. Use $pkgsrc to have an absolute path.
sSCNfldbl: From longdblfio.U:
This variable, if defined, contains the string used by stdio to format long doubles (format "f") for input.
ssizetype: From ssizetype.U:
This variable defines ssizetype to be something like ssize_t, long or int. It is used by functions that return a count of bytes or an error condition. It must be a signed type. We will pick a type such that sizeof(SSize_t) == sizeof(Size_t).
st_ino_sign: From st_ino_def.U:
This variable contains the signedness of struct stat's st_ino. 1 for unsigned, -1 for signed.
st_ino_size: From st_ino_def.U:
This variable contains the size of struct stat's st_ino in bytes.
startperl: From startperl.U:
This variable contains the string to put on the front of a perl script to make sure (hopefully) that it runs with perl and not some shell. Of course, that leading line must be followed by the classical perl idiom: eval 'exec perl -S $0 ${1+$@}' if $running_under_some_shell; to guarantee perl startup should the shell execute the script. Note that this magic incantation is not understood by csh.
startsh: From startsh.U:
This variable contains the string to put on the front of a shell script to make sure (hopefully) that it runs with sh and not some other shell.
static_ext: From Extensions.U:
This variable holds a list of "XS" extension files we want to link statically into the package. It is used by Makefile.
stdchar: From stdchar.U:
This variable conditionally defines "STDCHAR" to be the type of char used in stdio.h. It has the values ``unsigned char'' or "char".
stdio_base: From d_stdstdio.U:
This variable defines how, given a "FILE" pointer, fp, to access the _base field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the macro FILE_base(fp).
stdio_bufsiz: From d_stdstdio.U:
This variable defines how, given a "FILE" pointer, fp, to determine the number of bytes store in the I/O buffer pointer to by the _base field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the macro FILE_bufsiz(fp).
stdio_cnt: From d_stdstdio.U:
This variable defines how, given a "FILE" pointer, fp, to access the _cnt field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the macro FILE_cnt(fp).
stdio_filbuf: From d_stdstdio.U:
This variable defines how, given a "FILE" pointer, fp, to tell stdio to refill its internal buffers (?). This will be used to define the macro FILE_filbuf(fp).
stdio_ptr: From d_stdstdio.U:
This variable defines how, given a "FILE" pointer, fp, to access the _ptr field (or equivalent) of stdio.h's "FILE" structure. This will be used to define the macro FILE_ptr(fp).
stdio_stream_array: From stdio_streams.U:
This variable tells the name of the array holding the stdio streams. Usual values include _iob, __iob, and __sF.
strerror_r_proto: From d_strerror_r.U:
This variable encodes the prototype of strerror_r. It is zero if d_strerror_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_strerror_r is defined.
strings: From i_string.U:
This variable holds the full path of the string header that will be used. Typically /usr/include/string.h or /usr/include/strings.h.
submit: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
subversion: From patchlevel.U:
The subversion level of this package. The value of subversion comes from the patchlevel.h file. In a version number such as 5.6.1, this is the 1. In patchlevel.h, this is referred to as "PERL_SUBVERSION". This is unique to perl.
sysman: From sysman.U:
This variable holds the place where the manual is located on this system. It is not the place where the user wants to put his manual pages. Rather it is the place where Configure may look to find manual for unix commands (section 1 of the manual usually). See mansrc.
sysroot: From Sysroot.U:
This variable is empty unless supplied by the Configure user. It can contain a path to an alternative root directory, under which headers and libraries for the compilation target can be found. This is generally used when cross-compiling using a gcc-like compiler.

t

tail: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
tar: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
targetarch: From Cross.U:
If cross-compiling, this variable contains the target architecture. If not, this will be empty.
targetdir: From Cross.U:
This variable contains a path that will be created on the target host using targetmkdir, and then used to copy the cross-compiled executables to. Defaults to /tmp if not set.
targetenv: From Cross.U:
If cross-compiling, this variable can be used to modify the environment on the target system. However, how and where it's used, and even if it's used at all, is entirely dependent on both the transport mechanism (targetrun) and what the target system is. Unless the relevant documentation says otherwise, it is genereally not useful.
targethost: From Cross.U:
This variable contains the name of a separate host machine that can be used to run compiled test programs and perl tests on. Set to empty string if not in use.
targetmkdir: From Cross.U:
This variable contains the command used by Configure to create a new directory on the target host.
targetport: From Cross.U:
This variable contains the number of a network port to be used to connect to the host in targethost, if unset defaults to 22 for ssh.
targetsh: From sh.U:
If cross-compiling, this variable contains the location of sh on the target system. If not, this will be the same as $sh.
tbl: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
tee: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
test: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the test program. After Configure runs, the value is reset to a plain "test" and is not useful.
timeincl: From i_time.U:
This variable holds the full path of the included time header(s).
timetype: From d_time.U:
This variable holds the type returned by time(). It can be long, or time_t on "BSD" sites (in which case <sys/types.h> should be included). Anyway, the type Time_t should be used.
tmpnam_r_proto: From d_tmpnam_r.U:
This variable encodes the prototype of tmpnam_r. It is zero if d_tmpnam_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_tmpnam_r is defined.
to: From Cross.U:
This variable contains the command used by Configure to copy to from the target host. Useful and available only during Perl build. The string ":" if not cross-compiling.
touch: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the touch program. After Configure runs, the value is reset to a plain "touch" and is not useful.
tr: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the tr program. After Configure runs, the value is reset to a plain "tr" and is not useful.
trnl: From trnl.U:
This variable contains the value to be passed to the tr(1) command to transliterate a newline. Typical values are "\012" and "\n". This is needed for "EBCDIC" systems where newline is not necessarily "\012".
troff: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
ttyname_r_proto: From d_ttyname_r.U:
This variable encodes the prototype of ttyname_r. It is zero if d_ttyname_r is undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ttyname_r is defined.

u

u16size: From perlxv.U:
This variable is the size of an U16 in bytes.
u16type: From perlxv.U:
This variable contains the C type used for Perl's U16.
u32size: From perlxv.U:
This variable is the size of an U32 in bytes.
u32type: From perlxv.U:
This variable contains the C type used for Perl's U32.
u64size: From perlxv.U:
This variable is the size of an U64 in bytes.
u64type: From perlxv.U:
This variable contains the C type used for Perl's U64.
u8size: From perlxv.U:
This variable is the size of an U8 in bytes.
u8type: From perlxv.U:
This variable contains the C type used for Perl's U8.
uidformat: From uidf.U:
This variable contains the format string used for printing a Uid_t.
uidsign: From uidsign.U:
This variable contains the signedness of a uidtype. 1 for unsigned, -1 for signed.
uidsize: From uidsize.U:
This variable contains the size of a uidtype in bytes.
uidtype: From uidtype.U:
This variable defines Uid_t to be something like uid_t, int, ushort, or whatever type is used to declare user ids in the kernel.
uname: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the uname program. After Configure runs, the value is reset to a plain "uname" and is not useful.
uniq: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the uniq program. After Configure runs, the value is reset to a plain "uniq" and is not useful.
uquadtype: From quadtype.U:
This variable defines Uquad_t to be something like unsigned long, unsigned int, unsigned long long, uint64_t, or whatever type is used for 64-bit integers.
use5005threads: From usethreads.U:
This variable conditionally defines the
USE_5005THREADS
symbol, and indicates that Perl should be built to use the 5.005-based threading implementation. Only valid up to 5.8.x.
use64bitall: From use64bits.U:
This variable conditionally defines the
USE_64_BIT_ALL
symbol, and indicates that 64-bit integer types should be used when available. The maximal possible 64-bitness is employed:
LP64
or
ILP64,
meaning that you will be able to use more than 2 gigabytes of memory. This mode is even more binary incompatible than
USE_64_BIT_INT.
You may not be able to run the resulting executable in a 32-bit "CPU" at all or you may need at least to reboot your "OS" to 64-bit mode.
use64bitint: From use64bits.U:
This variable conditionally defines the
USE_64_BIT_INT
symbol, and indicates that 64-bit integer types should be used when available. The minimal possible 64-bitness is employed, just enough to get 64-bit integers into Perl. This may mean using for example ``long longs'', while your memory may still be limited to 2 gigabytes.
usecbacktrace: From usebacktrace.U:
This variable indicates whether we are compiling with backtrace support.
usecrosscompile: From Cross.U:
This variable conditionally defines the "USE_CROSS_COMPILE" symbol, and indicates that Perl has been cross-compiled.
usedevel: From Devel.U:
This variable indicates that Perl was configured with development features enabled. This should not be done for production builds.
usedl: From dlsrc.U:
This variable indicates if the system supports dynamic loading of some sort. See also dlsrc and dlobj.
usedtrace: From usedtrace.U:
This variable indicates whether we are compiling with dtrace support. See also dtrace.
usefaststdio: From usefaststdio.U:
This variable conditionally defines the "USE_FAST_STDIO" symbol, and indicates that Perl should be built to use "fast stdio". Defaults to define in Perls 5.8 and earlier, to undef later.
useithreads: From usethreads.U:
This variable conditionally defines the "USE_ITHREADS" symbol, and indicates that Perl should be built to use the interpreter-based threading implementation.
usekernprocpathname: From usekernprocpathname.U:
This variable, indicates that we can use sysctl with "KERN_PROC_PATHNAME" to get a full path for the executable, and hence convert $^X to an absolute path.
uselargefiles: From uselfs.U:
This variable conditionally defines the "USE_LARGE_FILES" symbol, and indicates that large file interfaces should be used when available.
uselongdouble: From uselongdbl.U:
This variable conditionally defines the "USE_LONG_DOUBLE" symbol, and indicates that long doubles should be used when available.
usemallocwrap: From mallocsrc.U:
This variable contains y if we are wrapping malloc to prevent integer overflow during size calculations.
usemorebits: From usemorebits.U:
This variable conditionally defines the "USE_MORE_BITS" symbol, and indicates that explicit 64-bit interfaces and long doubles should be used when available.
usemultiplicity: From usemultiplicity.U:
This variable conditionally defines the "MULTIPLICITY" symbol, and indicates that Perl should be built to use multiplicity.
usemymalloc: From mallocsrc.U:
This variable contains y if the malloc that comes with this package is desired over the system's version of malloc. People often include special versions of malloc for efficiency, but such versions are often less portable. See also mallocsrc and mallocobj. If this is "y", then -lmalloc is removed from $libs.
usenm: From usenm.U:
This variable contains "true" or "false" depending whether the nm extraction is wanted or not.
usensgetexecutablepath: From usensgetexecutablepath.U:
This symbol, if defined, indicates that we can use _NSGetExecutablePath and realpath to get a full path for the executable, and hence convert $^X to an absolute path.
useopcode: From Extensions.U:
This variable holds either "true" or "false" to indicate whether the Opcode extension should be used. The sole use for this currently is to allow an easy mechanism for users to skip the Opcode extension from the Configure command line.
useperlio: From useperlio.U:
This variable conditionally defines the "USE_PERLIO" symbol, and indicates that the PerlIO abstraction should be used throughout.
useposix: From Extensions.U:
This variable holds either "true" or "false" to indicate whether the "POSIX" extension should be used. The sole use for this currently is to allow an easy mechanism for hints files to indicate that "POSIX" will not compile on a particular system.
usequadmath: From usequadmath.U:
This variable conditionally defines the "USE_QUADMATH" symbol, and indicates that the quadmath library __float128 long doubles should be used when available.
usereentrant: From usethreads.U:
This variable conditionally defines the "USE_REENTRANT_API" symbol, which indicates that the thread code may try to use the various _r versions of library functions. This is only potentially meaningful if usethreads is set and is very experimental, it is not even prompted for.
userelocatableinc: From bin.U:
This variable is set to true to indicate that perl should relocate @"INC" entries at runtime based on the path to the perl binary. Any @"INC" paths starting .../ are relocated relative to the directory containing the perl binary, and a logical cleanup of the path is then made around the join point (removing dir/../ pairs)
useshrplib: From libperl.U:
This variable is set to "true" if the user wishes to build a shared libperl, and "false" otherwise.
usesitecustomize: From d_sitecustomize.U:
This variable is set to true when the user requires a mechanism that allows the sysadmin to add entries to @"INC" at runtime. This variable being set, makes perl run $sitelib/sitecustomize.pl at startup.
usesocks: From usesocks.U:
This variable conditionally defines the "USE_SOCKS" symbol, and indicates that Perl should be built to use "SOCKS".
usethreads: From usethreads.U:
This variable conditionally defines the "USE_THREADS" symbol, and indicates that Perl should be built to use threads.
usevendorprefix: From vendorprefix.U:
This variable tells whether the vendorprefix and consequently other vendor* paths are in use.
useversionedarchname: From archname.U:
This variable indicates whether to include the $api_versionstring as a component of the $archname.
usevfork: From d_vfork.U:
This variable is set to true when the user accepts to use vfork. It is set to false when no vfork is available or when the user explicitly requests not to use vfork.
usrinc: From usrinc.U:
This variable holds the path of the include files, which is usually /usr/include. It is mainly used by other Configure units.
uuname: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
uvoformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "UV" as an unsigned octal integer.
uvsize: From perlxv.U:
This variable is the size of a "UV" in bytes.
uvtype: From perlxv.U:
This variable contains the C type used for Perl's "UV".
uvuformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "UV" as an unsigned decimal integer.
uvxformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "UV" as an unsigned hexadecimal integer in lowercase abcdef.
uvXUformat: From perlxvf.U:
This variable contains the format string used for printing a Perl "UV" as an unsigned hexadecimal integer in uppercase "ABCDEF".

v

vaproto: From vaproto.U:
This variable conditionally defines "CAN_VAPROTO" on systems supporting prototype declaration of functions with a variable number of arguments. See also prototype.
vendorarch: From vendorarch.U:
This variable contains the value of the "PERL_VENDORARCH" symbol. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own architecture-dependent modules and extensions in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorarchexp: From vendorarch.U:
This variable is the ~name expanded version of vendorarch, so that you may use it directly in Makefiles or shell scripts.
vendorbin: From vendorbin.U:
This variable contains the eventual value of the "VENDORBIN" symbol. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place additional binaries in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorbinexp: From vendorbin.U:
This variable is the ~name expanded version of vendorbin, so that you may use it directly in Makefiles or shell scripts.
vendorhtml1dir: From vendorhtml1dir.U:
This variable contains the name of the directory for html pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own html pages in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorhtml1direxp: From vendorhtml1dir.U:
This variable is the ~name expanded version of vendorhtml1dir, so that you may use it directly in Makefiles or shell scripts.
vendorhtml3dir: From vendorhtml3dir.U:
This variable contains the name of the directory for html library pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own html pages for modules and extensions in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorhtml3direxp: From vendorhtml3dir.U:
This variable is the ~name expanded version of vendorhtml3dir, so that you may use it directly in Makefiles or shell scripts.
vendorlib: From vendorlib.U:
This variable contains the eventual value of the "VENDORLIB" symbol, which is the name of the private library for this package. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own modules in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorlib_stem: From vendorlib.U:
This variable is $vendorlibexp with any trailing version-specific component removed. The elements in inc_version_list (inc_version_list.U) can be tacked onto this variable to generate a list of directories to search.
vendorlibexp: From vendorlib.U:
This variable is the ~name expanded version of vendorlib, so that you may use it directly in Makefiles or shell scripts.
vendorman1dir: From vendorman1dir.U:
This variable contains the name of the directory for man1 pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own man1 pages in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorman1direxp: From vendorman1dir.U:
This variable is the ~name expanded version of vendorman1dir, so that you may use it directly in Makefiles or shell scripts.
vendorman3dir: From vendorman3dir.U:
This variable contains the name of the directory for man3 pages. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place their own man3 pages in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorman3direxp: From vendorman3dir.U:
This variable is the ~name expanded version of vendorman3dir, so that you may use it directly in Makefiles or shell scripts.
vendorprefix: From vendorprefix.U:
This variable holds the full absolute path of the directory below which the vendor will install add-on packages. See "INSTALL" for usage and examples.
vendorprefixexp: From vendorprefix.U:
This variable holds the full absolute path of the directory below which the vendor will install add-on packages. Derived from vendorprefix.
vendorscript: From vendorscript.U:
This variable contains the eventual value of the "VENDORSCRIPT" symbol. It may have a ~ on the front. The standard distribution will put nothing in this directory. Vendors who distribute perl may wish to place additional executable scripts in this directory with MakeMaker Makefile.PL "INSTALLDIRS"=vendor or equivalent. See "INSTALL" for details.
vendorscriptexp: From vendorscript.U:
This variable is the ~name expanded version of vendorscript, so that you may use it directly in Makefiles or shell scripts.
version: From patchlevel.U:
The full version number of this package, such as 5.6.1 (or 5_6_1). This combines revision, patchlevel, and subversion to get the full version number, including any possible subversions. This is suitable for use as a directory name, and hence is filesystem dependent.
version_patchlevel_string: From patchlevel.U:
This is a string combining version, subversion and perl_patchlevel (if perl_patchlevel is non-zero). It is typically something like 'version 7 subversion 1' or 'version 7 subversion 1 patchlevel 11224' It is computed here to avoid duplication of code in myconfig.SH and lib/Config.pm.
versiononly: From versiononly.U:
If set, this symbol indicates that only the version-specific components of a perl installation should be installed. This may be useful for making a test installation of a new version without disturbing the existing installation. Setting versiononly is equivalent to setting installperl's -v option. In particular, the non-versioned scripts and programs such as a2p, c2ph, h2xs, pod2*, and perldoc are not installed (see "INSTALL" for a more complete list). Nor are the man pages installed. Usually, this is undef.
vi: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.

x

xlibpth: From libpth.U:
This variable holds extra path (space-separated) used to find libraries on this platform, for example "CPU"-specific libraries (on multi-"CPU" platforms) may be listed here.

y

yacc: From yacc.U:
This variable holds the name of the compiler compiler we want to use in the Makefile. It can be yacc, byacc, or bison -y.
yaccflags: From yacc.U:
This variable contains any additional yacc flags desired by the user. It is up to the Makefile to use this.

z

zcat: From Loc.U:
This variable is defined but not used by Configure. The value is the empty string and is not useful.
zip: From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any) of the zip program. After Configure runs, the value is reset to a plain "zip" and is not useful.

GIT DATA

Information on the git commit from which the current perl binary was compiled can be found in the variable $Config::Git_Data. The variable is a structured string that looks something like this:

  git_commit_id='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'
  git_describe='GitLive-blead-1076-gea0c2db'
  git_branch='smartmatch'
  git_uncommitted_changes=''
  git_commit_id_title='Commit id:'
  git_commit_date='2009-05-09 17:47:31 +0200'

Its format is not guaranteed not to change over time.

NOTE

This module contains a good example of how to use tie to implement a cache and an example of how to make a tied variable readonly to those outside of it.

Config • man page

Config • man page

Config (3)

Leading comments

NAME

SYNOPSIS

DESCRIPTION

EXAMPLE

WARNING

GLOSSARY

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GIT DATA

NOTE

Man Section

extra • Version

extra • Source

extra • Book

References