2012-06-24 09:12:33 +00:00
|
|
|
# serial 12 -*- Autoconf -*-
|
2008-04-14 18:05:12 +00:00
|
|
|
# Enable extensions on systems that normally disable them.
|
|
|
|
|
|
2012-04-18 20:45:25 +00:00
|
|
|
# Copyright (C) 2003, 2006-2012 Free Software Foundation, Inc.
|
2008-04-14 18:05:12 +00:00
|
|
|
# This file is free software; the Free Software Foundation
|
|
|
|
|
# gives unlimited permission to copy and/or distribute it,
|
|
|
|
|
# with or without modifications, as long as this notice is preserved.
|
|
|
|
|
|
|
|
|
|
# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
|
|
|
|
|
# Autoconf. Perhaps we can remove this once we can assume Autoconf
|
|
|
|
|
# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly
|
|
|
|
|
# enough in this area it's likely we'll need to redefine
|
|
|
|
|
# AC_USE_SYSTEM_EXTENSIONS for quite some time.
|
|
|
|
|
|
2010-05-23 00:57:01 +00:00
|
|
|
# If autoconf reports a warning
|
|
|
|
|
# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
|
|
|
|
|
# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
|
|
|
|
|
# the fix is
|
|
|
|
|
# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
|
|
|
|
|
# but always AC_REQUIREd,
|
|
|
|
|
# 2) to ensure that for each occurrence of
|
|
|
|
|
# AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
|
|
|
|
|
# or
|
|
|
|
|
# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
|
|
|
# the corresponding gnulib module description has 'extensions' among
|
|
|
|
|
# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
|
|
|
|
|
# invocation occurs in gl_EARLY, not in gl_INIT.
|
|
|
|
|
|
2008-04-14 18:05:12 +00:00
|
|
|
# AC_USE_SYSTEM_EXTENSIONS
|
|
|
|
|
# ------------------------
|
|
|
|
|
# Enable extensions on systems that normally disable them,
|
|
|
|
|
# typically due to standards-conformance issues.
|
|
|
|
|
# Remember that #undef in AH_VERBATIM gets replaced with #define by
|
|
|
|
|
# AC_DEFINE. The goal here is to define all known feature-enabling
|
|
|
|
|
# macros, then, if reports of conflicts are made, disable macros that
|
|
|
|
|
# cause problems on some platforms (such as __EXTENSIONS__).
|
2010-05-23 00:57:01 +00:00
|
|
|
AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
|
2008-04-14 18:05:12 +00:00
|
|
|
[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
|
|
|
|
|
AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
|
|
|
|
|
|
2010-05-23 00:57:01 +00:00
|
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
|
|
|
|
|
2008-04-14 18:05:12 +00:00
|
|
|
AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
|
|
|
|
|
if test "$MINIX" = yes; then
|
|
|
|
|
AC_DEFINE([_POSIX_SOURCE], [1],
|
2012-04-18 20:45:25 +00:00
|
|
|
[Define to 1 if you need to in order for 'stat' and other
|
2008-04-14 18:05:12 +00:00
|
|
|
things to work.])
|
|
|
|
|
AC_DEFINE([_POSIX_1_SOURCE], [2],
|
|
|
|
|
[Define to 2 if the system does not provide POSIX.1 features
|
|
|
|
|
except with this defined.])
|
|
|
|
|
AC_DEFINE([_MINIX], [1],
|
|
|
|
|
[Define to 1 if on MINIX.])
|
|
|
|
|
fi
|
|
|
|
|
|
2010-05-23 00:57:01 +00:00
|
|
|
dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500,
|
|
|
|
|
dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already
|
|
|
|
|
dnl provided.
|
|
|
|
|
case "$host_os" in
|
|
|
|
|
hpux*)
|
|
|
|
|
AC_DEFINE([_XOPEN_SOURCE], [500],
|
|
|
|
|
[Define to 500 only on HP-UX.])
|
|
|
|
|
;;
|
|
|
|
|
esac
|
|
|
|
|
|
2008-04-14 18:05:12 +00:00
|
|
|
AH_VERBATIM([__EXTENSIONS__],
|
|
|
|
|
[/* Enable extensions on AIX 3, Interix. */
|
|
|
|
|
#ifndef _ALL_SOURCE
|
|
|
|
|
# undef _ALL_SOURCE
|
|
|
|
|
#endif
|
2012-06-24 09:12:33 +00:00
|
|
|
/* Enable general extensions on Mac OS X. */
|
2012-04-18 20:45:25 +00:00
|
|
|
#ifndef _DARWIN_C_SOURCE
|
|
|
|
|
# undef _DARWIN_C_SOURCE
|
|
|
|
|
#endif
|
2008-04-14 18:05:12 +00:00
|
|
|
/* Enable GNU extensions on systems that have them. */
|
|
|
|
|
#ifndef _GNU_SOURCE
|
|
|
|
|
# undef _GNU_SOURCE
|
|
|
|
|
#endif
|
|
|
|
|
/* Enable threading extensions on Solaris. */
|
|
|
|
|
#ifndef _POSIX_PTHREAD_SEMANTICS
|
|
|
|
|
# undef _POSIX_PTHREAD_SEMANTICS
|
|
|
|
|
#endif
|
|
|
|
|
/* Enable extensions on HP NonStop. */
|
|
|
|
|
#ifndef _TANDEM_SOURCE
|
|
|
|
|
# undef _TANDEM_SOURCE
|
|
|
|
|
#endif
|
|
|
|
|
/* Enable general extensions on Solaris. */
|
|
|
|
|
#ifndef __EXTENSIONS__
|
|
|
|
|
# undef __EXTENSIONS__
|
|
|
|
|
#endif
|
|
|
|
|
])
|
|
|
|
|
AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
|
|
|
|
|
[ac_cv_safe_to_define___extensions__],
|
|
|
|
|
[AC_COMPILE_IFELSE(
|
2010-05-23 00:57:01 +00:00
|
|
|
[AC_LANG_PROGRAM([[
|
|
|
|
|
# define __EXTENSIONS__ 1
|
|
|
|
|
]AC_INCLUDES_DEFAULT])],
|
2008-04-14 18:05:12 +00:00
|
|
|
[ac_cv_safe_to_define___extensions__=yes],
|
|
|
|
|
[ac_cv_safe_to_define___extensions__=no])])
|
|
|
|
|
test $ac_cv_safe_to_define___extensions__ = yes &&
|
|
|
|
|
AC_DEFINE([__EXTENSIONS__])
|
|
|
|
|
AC_DEFINE([_ALL_SOURCE])
|
2012-04-18 20:45:25 +00:00
|
|
|
AC_DEFINE([_DARWIN_C_SOURCE])
|
2008-04-14 18:05:12 +00:00
|
|
|
AC_DEFINE([_GNU_SOURCE])
|
|
|
|
|
AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
|
|
|
|
|
AC_DEFINE([_TANDEM_SOURCE])
|
|
|
|
|
])# AC_USE_SYSTEM_EXTENSIONS
|
|
|
|
|
|
|
|
|
|
# gl_USE_SYSTEM_EXTENSIONS
|
|
|
|
|
# ------------------------
|
|
|
|
|
# Enable extensions on systems that normally disable them,
|
|
|
|
|
# typically due to standards-conformance issues.
|
2010-05-23 00:57:01 +00:00
|
|
|
AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
|
|
|
|
|
[
|
|
|
|
|
dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
|
|
|
|
|
dnl gnulib does not need it. But if it gets required by third-party macros
|
|
|
|
|
dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
|
|
|
|
|
dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
|
|
|
|
|
dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
|
|
|
|
|
dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.
|
|
|
|
|
AC_REQUIRE([AC_GNU_SOURCE])
|
|
|
|
|
|
|
|
|
|
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
|
|
|
|
|
])
|
