Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
gapi2-codegen --version (return code: 0)
Usage: codegen --generate <filename1...>
gapi2-codegen --help (return code: -15)
Usage: codegen --generate <filename1...>