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5.12 Posix Variants
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.
— Macro: AC_AIX
If on AIX, define _ALL_SOURCE.
Allows the use of some BSD
functions. Should be called before any macros that run the C compiler.
— Macro: AC_GNU_SOURCE
If using the GNU C library, define _GNU_SOURCE.
Allows the use of some GNU functions. Should be called
before any macros that run the C compiler.
— Macro: AC_ISC_POSIX
For interactive Systems Corporation Unix, add -lcposix to output
variable LIBS if necessary for Posix facilities. Call this
after AC_PROG_CC and before any other macros that use Posix
interfaces. interactive Unix is no longer sold, and Sun says that
they will drop support for it on 2006-07-23, so this macro is becoming
obsolescent.
— Macro: AC_MINIX
If on Minix, define _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.
— Macro: AC_USE_SYSTEM_EXTENSIONS
If possible, enable extensions to Posix on hosts that normally disable
the extensions, typically due to standards-conformance namespace issues.
This may involve defining __EXTENSIONS__ and
_POSIX_PTHREAD_SEMANTICS, which are macros used by Solaris. This
macro also has the combined effects of AC_GNU_SOURCE,
AC_AIX, and AC_MINIX.
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