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The following macros check for certain operating systems that need special treatment for some programs, due to exceptional oddities in their header files or libraries. These macros are warts; they will be replaced by a more systematic approach, based on the functions they make available or the environments they provide.
_ALL_SOURCE
. Allows the use of some BSD
functions. Should be called before any macros that run the C compiler.
_POSIX_SOURCE
and add
`-posix' (for the GNU C compiler) or `-Xp' (for other C
compilers) to output variable CC
. This allows the use of
POSIX facilities. Must be called after AC_PROG_CC
and
before any other macros that run the C compiler.
_MINIX
and _POSIX_SOURCE
and define
_POSIX_1_SOURCE
to be 2. This allows the use of POSIX
facilities. Should be called before any macros that run the C compiler.