GNU Fortran (Ubuntu 7.2.0-6ubuntu1) 7.2.0 Copyright (C) 2017 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Usage: f77 [options] file... Options: -pass-exit-codes Exit with highest error code from a phase. --help Display this information. --target-help Display target specific command line options. --help={common|optimizers|params|target|warnings|[^]{joined|separate|undocumented}}[,...]. Display specific types of command line options. (Use '-v --help' to display command line options of sub-processes). --version Display compiler version information. -dumpspecs Display all of the built in spec strings. -dumpversion Display the version of the compiler. -dumpmachine Display the compiler's target processor. -print-search-dirs Display the directories in the compiler's search path. -print-libgcc-file-name Display the name of the compiler's companion library. -print-file-name=<lib> Display the full path to library <lib>. -print-prog-name=<prog> Display the full path to compiler component <prog>. -print-multiarch Display the target's normalized GNU triplet, used as a component in the library path. -print-multi-directory Display the root directory for versions of libgcc. -print-multi-lib Display the mapping between command line options and multiple library search directories. -print-multi-os-directory Display the relative path to OS libraries. -print-sysroot Display the target libraries directory. -print-sysroot-headers-suffix Display the sysroot suffix used to find headers. -Wa,<options> Pass comma-separated <options> on to the assembler. -Wp,<options> Pass comma-separated <options> on to the preprocessor. -Wl,<options> Pass comma-separated <options> on to the linker. -Xassembler <arg> Pass <arg> on to the assembler. -Xpreprocessor <arg> Pass <arg> on to the preprocessor. -Xlinker <arg> Pass <arg> on to the linker. -save-temps Do not delete intermediate files. -save-temps=<arg> Do not delete intermediate files. -no-canonical-prefixes Do not canonicalize paths when building relative prefixes to other gcc components. -pipe Use pipes rather than intermediate files. -time Time the execution of each subprocess. -specs=<file> Override built-in specs with the contents of <file>. -std=<standard> Assume that the input sources are for <standard>. --sysroot=<directory> Use <directory> as the root directory for headers and libraries. -B <directory> Add <directory> to the compiler's search paths. -v Display the programs invoked by the compiler. -### Like -v but options quoted and commands not executed. -E Preprocess only; do not compile, assemble or link. -S Compile only; do not assemble or link. -c Compile and assemble, but do not link. -o <file> Place the output into <file>. -pie Create a position independent executable. -shared Create a shared library. -x <language> Specify the language of the following input files. Permissible languages include: c c++ assembler none 'none' means revert to the default behavior of guessing the language based on the file's extension. Options starting with -g, -f, -m, -O, -W, or --param are automatically passed on to the various sub-processes invoked by f77. In order to pass other options on to these processes the -W<letter> options must be used. For bug reporting instructions, please see: <file:///usr/share/doc/gcc-7/README.Bugs>.