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-rw-r--r--gl/m4/extensions.m4209
1 files changed, 149 insertions, 60 deletions
diff --git a/gl/m4/extensions.m4 b/gl/m4/extensions.m4
index e30f122..0b3e4b5 100644
--- a/gl/m4/extensions.m4
+++ b/gl/m4/extensions.m4
@@ -1,14 +1,19 @@
1# serial 13 -*- Autoconf -*- 1# serial 22 -*- Autoconf -*-
2# Enable extensions on systems that normally disable them. 2# Enable extensions on systems that normally disable them.
3 3
4# Copyright (C) 2003, 2006-2013 Free Software Foundation, Inc. 4# Copyright (C) 2003, 2006-2022 Free Software Foundation, Inc.
5# This file is free software; the Free Software Foundation 5# This file is free software; the Free Software Foundation
6# gives unlimited permission to copy and/or distribute it, 6# gives unlimited permission to copy and/or distribute it,
7# with or without modifications, as long as this notice is preserved. 7# with or without modifications, as long as this notice is preserved.
8 8
9dnl Define to empty for the benefit of Autoconf 2.69 and earlier, so that
10dnl AC_USE_SYSTEM_EXTENSIONS (below) can be used unchanged from Autoconf 2.70+.
11m4_ifndef([AC_CHECK_INCLUDES_DEFAULT],
12 [AC_DEFUN([AC_CHECK_INCLUDES_DEFAULT], [])])
13
9# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git 14# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git
10# Autoconf. Perhaps we can remove this once we can assume Autoconf 15# Autoconf. Perhaps we can remove this once we can assume Autoconf
11# 2.70 or later everywhere, but since Autoconf mutates rapidly 16# is recent-enough everywhere, but since Autoconf mutates rapidly
12# enough in this area it's likely we'll need to redefine 17# enough in this area it's likely we'll need to redefine
13# AC_USE_SYSTEM_EXTENSIONS for quite some time. 18# AC_USE_SYSTEM_EXTENSIONS for quite some time.
14 19
@@ -26,67 +31,121 @@
26# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS 31# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
27# invocation occurs in gl_EARLY, not in gl_INIT. 32# invocation occurs in gl_EARLY, not in gl_INIT.
28 33
34m4_version_prereq([2.70.1], [], [
35
29# AC_USE_SYSTEM_EXTENSIONS 36# AC_USE_SYSTEM_EXTENSIONS
30# ------------------------ 37# ------------------------
31# Enable extensions on systems that normally disable them, 38# Enable extensions on systems that normally disable them,
32# typically due to standards-conformance issues. 39# typically due to standards-conformance issues.
33# 40# We unconditionally define as many of the known feature-enabling
34# Remember that #undef in AH_VERBATIM gets replaced with #define by 41# as possible, reserving conditional behavior for macros that are
35# AC_DEFINE. The goal here is to define all known feature-enabling 42# known to cause problems on some platforms (such as __EXTENSIONS__).
36# macros, then, if reports of conflicts are made, disable macros that
37# cause problems on some platforms (such as __EXTENSIONS__).
38AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], 43AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
39[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl 44[AC_BEFORE([$0], [AC_PREPROC_IFELSE])dnl
45AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
46AC_BEFORE([$0], [AC_LINK_IFELSE])dnl
40AC_BEFORE([$0], [AC_RUN_IFELSE])dnl 47AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
41 48AC_BEFORE([$0], [AC_CHECK_INCLUDES_DEFAULT])dnl
42 AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) 49dnl #undef in AH_VERBATIM gets replaced with #define by AC_DEFINE.
43 if test "$MINIX" = yes; then
44 AC_DEFINE([_POSIX_SOURCE], [1],
45 [Define to 1 if you need to in order for 'stat' and other
46 things to work.])
47 AC_DEFINE([_POSIX_1_SOURCE], [2],
48 [Define to 2 if the system does not provide POSIX.1 features
49 except with this defined.])
50 AC_DEFINE([_MINIX], [1],
51 [Define to 1 if on MINIX.])
52 AC_DEFINE([_NETBSD_SOURCE], [1],
53 [Define to 1 to make NetBSD features available. MINIX 3 needs this.])
54 fi
55
56dnl Use a different key than __EXTENSIONS__, as that name broke existing 50dnl Use a different key than __EXTENSIONS__, as that name broke existing
57dnl configure.ac when using autoheader 2.62. 51dnl configure.ac when using autoheader 2.62.
58 AH_VERBATIM([USE_SYSTEM_EXTENSIONS], 52dnl The macros below are in alphabetical order ignoring leading _ or __
53dnl prefixes.
54AH_VERBATIM([USE_SYSTEM_EXTENSIONS],
59[/* Enable extensions on AIX 3, Interix. */ 55[/* Enable extensions on AIX 3, Interix. */
60#ifndef _ALL_SOURCE 56#ifndef _ALL_SOURCE
61# undef _ALL_SOURCE 57# undef _ALL_SOURCE
62#endif 58#endif
63/* Enable general extensions on OS X. */ 59/* Enable general extensions on macOS. */
64#ifndef _DARWIN_C_SOURCE 60#ifndef _DARWIN_C_SOURCE
65# undef _DARWIN_C_SOURCE 61# undef _DARWIN_C_SOURCE
66#endif 62#endif
63/* Enable general extensions on Solaris. */
64#ifndef __EXTENSIONS__
65# undef __EXTENSIONS__
66#endif
67/* Enable GNU extensions on systems that have them. */ 67/* Enable GNU extensions on systems that have them. */
68#ifndef _GNU_SOURCE 68#ifndef _GNU_SOURCE
69# undef _GNU_SOURCE 69# undef _GNU_SOURCE
70#endif 70#endif
71/* Enable threading extensions on Solaris. */ 71/* Enable X/Open compliant socket functions that do not require linking
72 with -lxnet on HP-UX 11.11. */
73#ifndef _HPUX_ALT_XOPEN_SOCKET_API
74# undef _HPUX_ALT_XOPEN_SOCKET_API
75#endif
76/* Identify the host operating system as Minix.
77 This macro does not affect the system headers' behavior.
78 A future release of Autoconf may stop defining this macro. */
79#ifndef _MINIX
80# undef _MINIX
81#endif
82/* Enable general extensions on NetBSD.
83 Enable NetBSD compatibility extensions on Minix. */
84#ifndef _NETBSD_SOURCE
85# undef _NETBSD_SOURCE
86#endif
87/* Enable OpenBSD compatibility extensions on NetBSD.
88 Oddly enough, this does nothing on OpenBSD. */
89#ifndef _OPENBSD_SOURCE
90# undef _OPENBSD_SOURCE
91#endif
92/* Define to 1 if needed for POSIX-compatible behavior. */
93#ifndef _POSIX_SOURCE
94# undef _POSIX_SOURCE
95#endif
96/* Define to 2 if needed for POSIX-compatible behavior. */
97#ifndef _POSIX_1_SOURCE
98# undef _POSIX_1_SOURCE
99#endif
100/* Enable POSIX-compatible threading on Solaris. */
72#ifndef _POSIX_PTHREAD_SEMANTICS 101#ifndef _POSIX_PTHREAD_SEMANTICS
73# undef _POSIX_PTHREAD_SEMANTICS 102# undef _POSIX_PTHREAD_SEMANTICS
74#endif 103#endif
104/* Enable extensions specified by ISO/IEC TS 18661-5:2014. */
105#ifndef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
106# undef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
107#endif
108/* Enable extensions specified by ISO/IEC TS 18661-1:2014. */
109#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
110# undef __STDC_WANT_IEC_60559_BFP_EXT__
111#endif
112/* Enable extensions specified by ISO/IEC TS 18661-2:2015. */
113#ifndef __STDC_WANT_IEC_60559_DFP_EXT__
114# undef __STDC_WANT_IEC_60559_DFP_EXT__
115#endif
116/* Enable extensions specified by ISO/IEC TS 18661-4:2015. */
117#ifndef __STDC_WANT_IEC_60559_FUNCS_EXT__
118# undef __STDC_WANT_IEC_60559_FUNCS_EXT__
119#endif
120/* Enable extensions specified by ISO/IEC TS 18661-3:2015. */
121#ifndef __STDC_WANT_IEC_60559_TYPES_EXT__
122# undef __STDC_WANT_IEC_60559_TYPES_EXT__
123#endif
124/* Enable extensions specified by ISO/IEC TR 24731-2:2010. */
125#ifndef __STDC_WANT_LIB_EXT2__
126# undef __STDC_WANT_LIB_EXT2__
127#endif
128/* Enable extensions specified by ISO/IEC 24747:2009. */
129#ifndef __STDC_WANT_MATH_SPEC_FUNCS__
130# undef __STDC_WANT_MATH_SPEC_FUNCS__
131#endif
75/* Enable extensions on HP NonStop. */ 132/* Enable extensions on HP NonStop. */
76#ifndef _TANDEM_SOURCE 133#ifndef _TANDEM_SOURCE
77# undef _TANDEM_SOURCE 134# undef _TANDEM_SOURCE
78#endif 135#endif
79/* Enable X/Open extensions if necessary. HP-UX 11.11 defines 136/* Enable X/Open extensions. Define to 500 only if necessary
80 mbstate_t only if _XOPEN_SOURCE is defined to 500, regardless of 137 to make mbstate_t available. */
81 whether compiling with -Ae or -D_HPUX_SOURCE=1. */
82#ifndef _XOPEN_SOURCE 138#ifndef _XOPEN_SOURCE
83# undef _XOPEN_SOURCE 139# undef _XOPEN_SOURCE
84#endif 140#endif
85/* Enable general extensions on Solaris. */ 141])dnl
86#ifndef __EXTENSIONS__ 142
87# undef __EXTENSIONS__ 143 AC_REQUIRE([AC_CHECK_INCLUDES_DEFAULT])dnl
88#endif 144 _AC_CHECK_HEADER_ONCE([wchar.h])
89]) 145 _AC_CHECK_HEADER_ONCE([minix/config.h])
146
147dnl Defining __EXTENSIONS__ may break the system headers on some systems.
148dnl (FIXME: Which ones?)
90 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], 149 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
91 [ac_cv_safe_to_define___extensions__], 150 [ac_cv_safe_to_define___extensions__],
92 [AC_COMPILE_IFELSE( 151 [AC_COMPILE_IFELSE(
@@ -95,30 +154,56 @@ dnl configure.ac when using autoheader 2.62.
95 ]AC_INCLUDES_DEFAULT])], 154 ]AC_INCLUDES_DEFAULT])],
96 [ac_cv_safe_to_define___extensions__=yes], 155 [ac_cv_safe_to_define___extensions__=yes],
97 [ac_cv_safe_to_define___extensions__=no])]) 156 [ac_cv_safe_to_define___extensions__=no])])
98 test $ac_cv_safe_to_define___extensions__ = yes && 157
99 AC_DEFINE([__EXTENSIONS__]) 158dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to
100 AC_DEFINE([_ALL_SOURCE]) 159dnl 500, regardless of whether compiling with -Ae or -D_HPUX_SOURCE=1.
101 AC_DEFINE([_DARWIN_C_SOURCE]) 160dnl But defining _XOPEN_SOURCE may turn *off* extensions on platforms
102 AC_DEFINE([_GNU_SOURCE]) 161dnl not covered by turn-on-extensions macros (notably Dragonfly, Free,
103 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) 162dnl and OpenBSD, which don't have any equivalent of _NETBSD_SOURCE) so
104 AC_DEFINE([_TANDEM_SOURCE]) 163dnl it should only be defined when necessary.
105 AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined], 164 AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined],
106 [ac_cv_should_define__xopen_source], 165 [ac_cv_should_define__xopen_source],
107 [ac_cv_should_define__xopen_source=no 166 [ac_cv_should_define__xopen_source=no
108 AC_COMPILE_IFELSE( 167 AS_IF([test $ac_cv_header_wchar_h = yes],
109 [AC_LANG_PROGRAM([[ 168 [AC_COMPILE_IFELSE(
169 [AC_LANG_PROGRAM([[
110 #include <wchar.h> 170 #include <wchar.h>
111 mbstate_t x;]])], 171 mbstate_t x;]])],
112 [], 172 [],
113 [AC_COMPILE_IFELSE( 173 [AC_COMPILE_IFELSE(
114 [AC_LANG_PROGRAM([[ 174 [AC_LANG_PROGRAM([[
115 #define _XOPEN_SOURCE 500 175 #define _XOPEN_SOURCE 500
116 #include <wchar.h> 176 #include <wchar.h>
117 mbstate_t x;]])], 177 mbstate_t x;]])],
118 [ac_cv_should_define__xopen_source=yes])])]) 178 [ac_cv_should_define__xopen_source=yes])])])])
119 test $ac_cv_should_define__xopen_source = yes && 179
120 AC_DEFINE([_XOPEN_SOURCE], [500]) 180 AC_DEFINE([_ALL_SOURCE])
181 AC_DEFINE([_DARWIN_C_SOURCE])
182 AC_DEFINE([_GNU_SOURCE])
183 AC_DEFINE([_HPUX_ALT_XOPEN_SOCKET_API])
184 AC_DEFINE([_NETBSD_SOURCE])
185 AC_DEFINE([_OPENBSD_SOURCE])
186 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
187 AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__])
188 AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__])
189 AC_DEFINE([__STDC_WANT_IEC_60559_DFP_EXT__])
190 AC_DEFINE([__STDC_WANT_IEC_60559_FUNCS_EXT__])
191 AC_DEFINE([__STDC_WANT_IEC_60559_TYPES_EXT__])
192 AC_DEFINE([__STDC_WANT_LIB_EXT2__])
193 AC_DEFINE([__STDC_WANT_MATH_SPEC_FUNCS__])
194 AC_DEFINE([_TANDEM_SOURCE])
195 AS_IF([test $ac_cv_header_minix_config_h = yes],
196 [MINIX=yes
197 AC_DEFINE([_MINIX])
198 AC_DEFINE([_POSIX_SOURCE])
199 AC_DEFINE([_POSIX_1_SOURCE], [2])],
200 [MINIX=])
201 AS_IF([test $ac_cv_safe_to_define___extensions__ = yes],
202 [AC_DEFINE([__EXTENSIONS__])])
203 AS_IF([test $ac_cv_should_define__xopen_source = yes],
204 [AC_DEFINE([_XOPEN_SOURCE], [500])])
121])# AC_USE_SYSTEM_EXTENSIONS 205])# AC_USE_SYSTEM_EXTENSIONS
206])
122 207
123# gl_USE_SYSTEM_EXTENSIONS 208# gl_USE_SYSTEM_EXTENSIONS
124# ------------------------ 209# ------------------------
@@ -126,13 +211,17 @@ dnl configure.ac when using autoheader 2.62.
126# typically due to standards-conformance issues. 211# typically due to standards-conformance issues.
127AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], 212AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
128[ 213[
129 dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
130 dnl gnulib does not need it. But if it gets required by third-party macros
131 dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
132 dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
133 dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
134 dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.
135 AC_REQUIRE([AC_GNU_SOURCE])
136
137 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 214 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
215
216 dnl On OpenBSD 6.8 with GCC, the include files contain a couple of
217 dnl definitions that are only activated with an explicit -D_ISOC11_SOURCE.
218 dnl That's because this version of GCC (4.2.1) supports the option
219 dnl '-std=gnu99' but not the option '-std=gnu11'.
220 AC_REQUIRE([AC_CANONICAL_HOST])
221 case "$host_os" in
222 openbsd*)
223 AC_DEFINE([_ISOC11_SOURCE], [1],
224 [Define to enable the declarations of ISO C 11 types and functions.])
225 ;;
226 esac
138]) 227])