232 lines
8.4 KiB
Text
232 lines
8.4 KiB
Text
# serial 23 -*- Autoconf -*-
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# Enable extensions on systems that normally disable them.
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# Copyright (C) 2003, 2006-2023 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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dnl Define to empty for the benefit of Autoconf 2.69 and earlier, so that
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dnl AC_USE_SYSTEM_EXTENSIONS (below) can be used unchanged from Autoconf 2.70+.
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m4_ifndef([AC_CHECK_INCLUDES_DEFAULT],
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[AC_DEFUN([AC_CHECK_INCLUDES_DEFAULT], [])])
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# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git
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# Autoconf. Perhaps we can remove this once we can assume Autoconf
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# is recent-enough everywhere, but since Autoconf mutates rapidly
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# enough in this area it's likely we'll need to redefine
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# AC_USE_SYSTEM_EXTENSIONS for quite some time.
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# If autoconf reports a warning
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# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
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# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
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# the fix is
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# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
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# but always AC_REQUIREd,
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# 2) to ensure that for each occurrence of
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# AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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# or
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# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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# the corresponding gnulib module description has 'extensions' among
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# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
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# invocation occurs in gl_EARLY, not in gl_INIT.
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m4_version_prereq([2.72], [], [
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# AC_USE_SYSTEM_EXTENSIONS
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# ------------------------
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# Enable extensions on systems that normally disable them,
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# typically due to standards-conformance issues.
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# We unconditionally define as many of the known feature-enabling
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# as possible, reserving conditional behavior for macros that are
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# known to cause problems on some platforms (such as __EXTENSIONS__).
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AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
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[AC_BEFORE([$0], [AC_PREPROC_IFELSE])dnl
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AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
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AC_BEFORE([$0], [AC_LINK_IFELSE])dnl
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AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
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AC_BEFORE([$0], [AC_CHECK_INCLUDES_DEFAULT])dnl
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dnl #undef in AH_VERBATIM gets replaced with #define by AC_DEFINE.
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dnl Use a different key than __EXTENSIONS__, as that name broke existing
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dnl configure.ac when using autoheader 2.62.
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dnl The macros below are in alphabetical order ignoring leading _ or __
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dnl prefixes.
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AH_VERBATIM([USE_SYSTEM_EXTENSIONS],
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[/* Enable extensions on AIX 3, Interix. */
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#ifndef _ALL_SOURCE
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# undef _ALL_SOURCE
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#endif
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/* Enable general extensions on macOS. */
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#ifndef _DARWIN_C_SOURCE
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# undef _DARWIN_C_SOURCE
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#endif
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/* Enable general extensions on Solaris. */
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#ifndef __EXTENSIONS__
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# undef __EXTENSIONS__
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#endif
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/* Enable GNU extensions on systems that have them. */
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#ifndef _GNU_SOURCE
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# undef _GNU_SOURCE
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#endif
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/* Enable X/Open compliant socket functions that do not require linking
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with -lxnet on HP-UX 11.11. */
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#ifndef _HPUX_ALT_XOPEN_SOCKET_API
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# undef _HPUX_ALT_XOPEN_SOCKET_API
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#endif
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/* Identify the host operating system as Minix.
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This macro does not affect the system headers' behavior.
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A future release of Autoconf may stop defining this macro. */
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#ifndef _MINIX
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# undef _MINIX
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#endif
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/* Enable general extensions on NetBSD.
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Enable NetBSD compatibility extensions on Minix. */
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#ifndef _NETBSD_SOURCE
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# undef _NETBSD_SOURCE
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#endif
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/* Enable OpenBSD compatibility extensions on NetBSD.
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Oddly enough, this does nothing on OpenBSD. */
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#ifndef _OPENBSD_SOURCE
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# undef _OPENBSD_SOURCE
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#endif
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/* Define to 1 if needed for POSIX-compatible behavior. */
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#ifndef _POSIX_SOURCE
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# undef _POSIX_SOURCE
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#endif
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/* Define to 2 if needed for POSIX-compatible behavior. */
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#ifndef _POSIX_1_SOURCE
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# undef _POSIX_1_SOURCE
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#endif
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/* Enable POSIX-compatible threading on Solaris. */
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#ifndef _POSIX_PTHREAD_SEMANTICS
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# undef _POSIX_PTHREAD_SEMANTICS
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#endif
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/* Enable extensions specified by ISO/IEC TS 18661-5:2014. */
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#ifndef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
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# undef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
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#endif
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/* Enable extensions specified by ISO/IEC TS 18661-1:2014. */
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#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
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# undef __STDC_WANT_IEC_60559_BFP_EXT__
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#endif
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/* Enable extensions specified by ISO/IEC TS 18661-2:2015. */
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#ifndef __STDC_WANT_IEC_60559_DFP_EXT__
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# undef __STDC_WANT_IEC_60559_DFP_EXT__
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#endif
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/* Enable extensions specified by C23 Annex F. */
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#ifndef __STDC_WANT_IEC_60559_EXT__
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# undef __STDC_WANT_IEC_60559_EXT__
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#endif
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/* Enable extensions specified by ISO/IEC TS 18661-4:2015. */
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#ifndef __STDC_WANT_IEC_60559_FUNCS_EXT__
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# undef __STDC_WANT_IEC_60559_FUNCS_EXT__
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#endif
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/* Enable extensions specified by C23 Annex H and ISO/IEC TS 18661-3:2015. */
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#ifndef __STDC_WANT_IEC_60559_TYPES_EXT__
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# undef __STDC_WANT_IEC_60559_TYPES_EXT__
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#endif
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/* Enable extensions specified by ISO/IEC TR 24731-2:2010. */
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#ifndef __STDC_WANT_LIB_EXT2__
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# undef __STDC_WANT_LIB_EXT2__
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#endif
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/* Enable extensions specified by ISO/IEC 24747:2009. */
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#ifndef __STDC_WANT_MATH_SPEC_FUNCS__
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# undef __STDC_WANT_MATH_SPEC_FUNCS__
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#endif
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/* Enable extensions on HP NonStop. */
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#ifndef _TANDEM_SOURCE
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# undef _TANDEM_SOURCE
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#endif
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/* Enable X/Open extensions. Define to 500 only if necessary
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to make mbstate_t available. */
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#ifndef _XOPEN_SOURCE
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# undef _XOPEN_SOURCE
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#endif
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])dnl
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AC_REQUIRE([AC_CHECK_INCLUDES_DEFAULT])dnl
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_AC_CHECK_HEADER_ONCE([wchar.h])
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_AC_CHECK_HEADER_ONCE([minix/config.h])
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dnl Defining __EXTENSIONS__ may break the system headers on some systems.
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dnl (FIXME: Which ones?)
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AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
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[ac_cv_safe_to_define___extensions__],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[
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# define __EXTENSIONS__ 1
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]AC_INCLUDES_DEFAULT])],
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[ac_cv_safe_to_define___extensions__=yes],
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[ac_cv_safe_to_define___extensions__=no])])
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dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to
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dnl 500, regardless of whether compiling with -Ae or -D_HPUX_SOURCE=1.
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dnl But defining _XOPEN_SOURCE may turn *off* extensions on platforms
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dnl not covered by turn-on-extensions macros (notably Dragonfly, Free,
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dnl and OpenBSD, which don't have any equivalent of _NETBSD_SOURCE) so
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dnl it should only be defined when necessary.
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AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined],
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[ac_cv_should_define__xopen_source],
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[ac_cv_should_define__xopen_source=no
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AS_IF([test $ac_cv_header_wchar_h = yes],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[
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#include <wchar.h>
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mbstate_t x;]])],
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[],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[
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#define _XOPEN_SOURCE 500
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#include <wchar.h>
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mbstate_t x;]])],
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[ac_cv_should_define__xopen_source=yes])])])])
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AC_DEFINE([_ALL_SOURCE])
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AC_DEFINE([_DARWIN_C_SOURCE])
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AC_DEFINE([_GNU_SOURCE])
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AC_DEFINE([_HPUX_ALT_XOPEN_SOCKET_API])
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AC_DEFINE([_NETBSD_SOURCE])
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AC_DEFINE([_OPENBSD_SOURCE])
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AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__])
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AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__])
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AC_DEFINE([__STDC_WANT_IEC_60559_DFP_EXT__])
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AC_DEFINE([__STDC_WANT_IEC_60559_EXT__])
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AC_DEFINE([__STDC_WANT_IEC_60559_FUNCS_EXT__])
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AC_DEFINE([__STDC_WANT_IEC_60559_TYPES_EXT__])
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AC_DEFINE([__STDC_WANT_LIB_EXT2__])
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AC_DEFINE([__STDC_WANT_MATH_SPEC_FUNCS__])
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AC_DEFINE([_TANDEM_SOURCE])
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AS_IF([test $ac_cv_header_minix_config_h = yes],
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[MINIX=yes
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AC_DEFINE([_MINIX])
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AC_DEFINE([_POSIX_SOURCE])
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AC_DEFINE([_POSIX_1_SOURCE], [2])],
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[MINIX=])
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AS_IF([test $ac_cv_safe_to_define___extensions__ = yes],
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[AC_DEFINE([__EXTENSIONS__])])
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AS_IF([test $ac_cv_should_define__xopen_source = yes],
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[AC_DEFINE([_XOPEN_SOURCE], [500])])
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])# AC_USE_SYSTEM_EXTENSIONS
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])
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# gl_USE_SYSTEM_EXTENSIONS
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# ------------------------
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# Enable extensions on systems that normally disable them,
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# typically due to standards-conformance issues.
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AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
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[
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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dnl On OpenBSD 6.8 with GCC, the include files contain a couple of
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dnl definitions that are only activated with an explicit -D_ISOC11_SOURCE.
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dnl That's because this version of GCC (4.2.1) supports the option
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dnl '-std=gnu99' but not the option '-std=gnu11'.
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AC_REQUIRE([AC_CANONICAL_HOST])
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case "$host_os" in
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openbsd*)
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AC_DEFINE([_ISOC11_SOURCE], [1],
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[Define to enable the declarations of ISO C 11 types and functions.])
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;;
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esac
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])
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