Because of user demand, in addition to full Texinfo manuals, man pages
are provided which contain extracts from those manuals. These man
pages are generated from the Texinfo manuals using
contrib/texi2pod.pl and pod2man. (The man page for
g++, cp/g++.1, just contains a ‘.so’ reference
to gcc.1, but all the other man pages are generated from
Texinfo manuals.)
Because many systems may not have the necessary tools installed to generate the man pages, they are only generated if the configure script detects that recent enough tools are installed, and the Makefiles allow generating man pages to fail without aborting the build. Man pages are also included in release distributions. They are generated in the source directory.
Magic comments in Texinfo files starting ‘@c man’ control what parts of a Texinfo file go into a man page. Only a subset of Texinfo is supported by texi2pod.pl, and it may be necessary to add support for more Texinfo features to this script when generating new man pages. To improve the man page output, some special Texinfo macros are provided in doc/include/gcc-common.texi which texi2pod.pl understands:
@gcctaboptUse in the form ‘@table @gcctabopt’ for tables of options, where for printed output the effect of ‘@code’ is better than that of ‘@option’ but for man page output a different effect is wanted.
@gccoptlistUse for summary lists of options in manuals.
FIXME: describe the texi2pod.pl input language and magic comments in more detail.