Diff: extensions.m4 - extensions.m4

	extensions.m4	extensions.m4

	# serial 9 -- Autoconf --	# serial 13 -- Autoconf --
	# Enable extensions on systems that normally disable them.	# Enable extensions on systems that normally disable them.


	# Copyright (C) 2003, 2006-2010 Free Software Foundation, Inc.	# Copyright (C) 2003, 2006-2014 Free Software Foundation, Inc.
	# This file is free software; the Free Software Foundation	# This file is free software; the Free Software Foundation
	# gives unlimited permission to copy and/or distribute it,	# gives unlimited permission to copy and/or distribute it,
	# with or without modifications, as long as this notice is preserved.	# with or without modifications, as long as this notice is preserved.


	# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS	# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git
	# Autoconf. Perhaps we can remove this once we can assume Autoconf	# Autoconf. Perhaps we can remove this once we can assume Autoconf

	# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly	# 2.70 or later everywhere, but since Autoconf mutates rapidly
	# enough in this area it's likely we'll need to redefine	# enough in this area it's likely we'll need to redefine
	# AC_USE_SYSTEM_EXTENSIONS for quite some time.	# AC_USE_SYSTEM_EXTENSIONS for quite some time.

	# If autoconf reports a warning	# If autoconf reports a warning
	# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS	# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
	# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS	# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
	# the fix is	# the fix is
	# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked	# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
	# but always AC_REQUIREd,	# but always AC_REQUIREd,
	# 2) to ensure that for each occurrence of	# 2) to ensure that for each occurrence of

	skipping to change at line 33	skipping to change at line 33
	# or	# or
	# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])	# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
	# the corresponding gnulib module description has 'extensions' among	# the corresponding gnulib module description has 'extensions' among
	# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS	# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
	# invocation occurs in gl_EARLY, not in gl_INIT.	# invocation occurs in gl_EARLY, not in gl_INIT.

	# AC_USE_SYSTEM_EXTENSIONS	# AC_USE_SYSTEM_EXTENSIONS
	# ------------------------	# ------------------------
	# Enable extensions on systems that normally disable them,	# Enable extensions on systems that normally disable them,
	# typically due to standards-conformance issues.	# typically due to standards-conformance issues.

		#
	# Remember that #undef in AH_VERBATIM gets replaced with #define by	# Remember that #undef in AH_VERBATIM gets replaced with #define by
	# AC_DEFINE. The goal here is to define all known feature-enabling	# AC_DEFINE. The goal here is to define all known feature-enabling
	# macros, then, if reports of conflicts are made, disable macros that	# macros, then, if reports of conflicts are made, disable macros that
	# cause problems on some platforms (such as __EXTENSIONS__).	# cause problems on some platforms (such as __EXTENSIONS__).
	AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],	AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
	[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl	[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
	AC_BEFORE([$0], [AC_RUN_IFELSE])dnl	AC_BEFORE([$0], [AC_RUN_IFELSE])dnl


	AC_REQUIRE([AC_CANONICAL_HOST])

	AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])	AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
	if test "$MINIX" = yes; then	if test "$MINIX" = yes; then
	AC_DEFINE([_POSIX_SOURCE], [1],	AC_DEFINE([_POSIX_SOURCE], [1],

	[Define to 1 if you need to in order for `stat' and other	[Define to 1 if you need to in order for 'stat' and other
	things to work.])	things to work.])
	AC_DEFINE([_POSIX_1_SOURCE], [2],	AC_DEFINE([_POSIX_1_SOURCE], [2],
	[Define to 2 if the system does not provide POSIX.1 features	[Define to 2 if the system does not provide POSIX.1 features
	except with this defined.])	except with this defined.])
	AC_DEFINE([_MINIX], [1],	AC_DEFINE([_MINIX], [1],
	[Define to 1 if on MINIX.])	[Define to 1 if on MINIX.])

		AC_DEFINE([_NETBSD_SOURCE], [1],
		[Define to 1 to make NetBSD features available. MINIX 3 needs this.]
		)
	fi	fi


	dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500	dnl Use a different key than __EXTENSIONS__, as that name broke existing
	,	dnl configure.ac when using autoheader 2.62.
	dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already	AH_VERBATIM([USE_SYSTEM_EXTENSIONS],
	dnl provided.
	case "$host_os" in
	hpux*)
	AC_DEFINE([_XOPEN_SOURCE], [500],
	[Define to 500 only on HP-UX.])
	;;
	esac

	AH_VERBATIM([__EXTENSIONS__],
	[/* Enable extensions on AIX 3, Interix. */	[/* Enable extensions on AIX 3, Interix. */
	#ifndef _ALL_SOURCE	#ifndef _ALL_SOURCE
	# undef _ALL_SOURCE	# undef _ALL_SOURCE
	#endif	#endif

		/* Enable general extensions on OS X. */
		#ifndef _DARWIN_C_SOURCE
		# undef _DARWIN_C_SOURCE
		#endif
	/* Enable GNU extensions on systems that have them. */	/* Enable GNU extensions on systems that have them. */
	#ifndef _GNU_SOURCE	#ifndef _GNU_SOURCE
	# undef _GNU_SOURCE	# undef _GNU_SOURCE
	#endif	#endif
	/* Enable threading extensions on Solaris. */	/* Enable threading extensions on Solaris. */
	#ifndef _POSIX_PTHREAD_SEMANTICS	#ifndef _POSIX_PTHREAD_SEMANTICS
	# undef _POSIX_PTHREAD_SEMANTICS	# undef _POSIX_PTHREAD_SEMANTICS
	#endif	#endif
	/* Enable extensions on HP NonStop. */	/* Enable extensions on HP NonStop. */
	#ifndef _TANDEM_SOURCE	#ifndef _TANDEM_SOURCE
	# undef _TANDEM_SOURCE	# undef _TANDEM_SOURCE
	#endif	#endif

		/* Enable X/Open extensions if necessary. HP-UX 11.11 defines
		mbstate_t only if _XOPEN_SOURCE is defined to 500, regardless of
		whether compiling with -Ae or -D_HPUX_SOURCE=1. */
		#ifndef _XOPEN_SOURCE
		# undef _XOPEN_SOURCE
		#endif
	/* Enable general extensions on Solaris. */	/* Enable general extensions on Solaris. */
	#ifndef __EXTENSIONS__	#ifndef __EXTENSIONS__
	# undef __EXTENSIONS__	# undef __EXTENSIONS__
	#endif	#endif
	])	])
	AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],	AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
	[ac_cv_safe_to_define___extensions__],	[ac_cv_safe_to_define___extensions__],
	[AC_COMPILE_IFELSE(	[AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM([[	[AC_LANG_PROGRAM([[
	# define __EXTENSIONS__ 1	# define __EXTENSIONS__ 1
	]AC_INCLUDES_DEFAULT])],	]AC_INCLUDES_DEFAULT])],
	[ac_cv_safe_to_define___extensions__=yes],	[ac_cv_safe_to_define___extensions__=yes],
	[ac_cv_safe_to_define___extensions__=no])])	[ac_cv_safe_to_define___extensions__=no])])
	test $ac_cv_safe_to_define___extensions__ = yes &&	test $ac_cv_safe_to_define___extensions__ = yes &&
	AC_DEFINE([__EXTENSIONS__])	AC_DEFINE([__EXTENSIONS__])
	AC_DEFINE([_ALL_SOURCE])	AC_DEFINE([_ALL_SOURCE])

		AC_DEFINE([_DARWIN_C_SOURCE])
	AC_DEFINE([_GNU_SOURCE])	AC_DEFINE([_GNU_SOURCE])
	AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])	AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
	AC_DEFINE([_TANDEM_SOURCE])	AC_DEFINE([_TANDEM_SOURCE])

		AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined],
		[ac_cv_should_define__xopen_source],
		[ac_cv_should_define__xopen_source=no
		AC_COMPILE_IFELSE(
		[AC_LANG_PROGRAM([[
		#include <wchar.h>
		mbstate_t x;]])],
		[],
		[AC_COMPILE_IFELSE(
		[AC_LANG_PROGRAM([[
		#define _XOPEN_SOURCE 500
		#include <wchar.h>
		mbstate_t x;]])],
		[ac_cv_should_define__xopen_source=yes])])])
		test $ac_cv_should_define__xopen_source = yes &&
		AC_DEFINE([_XOPEN_SOURCE], [500])
	])# AC_USE_SYSTEM_EXTENSIONS	])# AC_USE_SYSTEM_EXTENSIONS

	# gl_USE_SYSTEM_EXTENSIONS	# gl_USE_SYSTEM_EXTENSIONS
	# ------------------------	# ------------------------
	# Enable extensions on systems that normally disable them,	# Enable extensions on systems that normally disable them,
	# typically due to standards-conformance issues.	# typically due to standards-conformance issues.
	AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],	AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
	[	[
	dnl Require this macro before AC_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 macro s	dnl gnulib does not need it. But if it gets required by third-party macro s

End of changes. 13 change blocks.
	19 lines changed or deleted	39 lines changed or added
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