1: # serial 18 -*- Autoconf -*-
2: # Enable extensions on systems that normally disable them.
3:
4: # Copyright (C) 2003, 2006-2019 Free Software Foundation, Inc.
5: # This file is free software; the Free Software Foundation
6: # gives unlimited permission to copy and/or distribute it,
7: # with or without modifications, as long as this notice is preserved.
8:
9: # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git
10: # Autoconf. Perhaps we can remove this once we can assume Autoconf
11: # 2.70 or later everywhere, but since Autoconf mutates rapidly
12: # enough in this area it's likely we'll need to redefine
13: # AC_USE_SYSTEM_EXTENSIONS for quite some time.
14:
15: # If autoconf reports a warning
16: # warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
17: # or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
18: # the fix is
19: # 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
20: # but always AC_REQUIREd,
21: # 2) to ensure that for each occurrence of
22: # AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
23: # or
24: # AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
25: # the corresponding gnulib module description has 'extensions' among
26: # its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
27: # invocation occurs in gl_EARLY, not in gl_INIT.
28:
29: # AC_USE_SYSTEM_EXTENSIONS
30: # ------------------------
31: # Enable extensions on systems that normally disable them,
32: # typically due to standards-conformance issues.
33: #
34: # Remember that #undef in AH_VERBATIM gets replaced with #define by
35: # AC_DEFINE. The goal here is to define all known feature-enabling
36: # macros, then, if reports of conflicts are made, disable macros that
37: # cause problems on some platforms (such as __EXTENSIONS__).
38: AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
39: [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
40: AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
41:
42: AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
43: if test "$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:
56: dnl Use a different key than __EXTENSIONS__, as that name broke existing
57: dnl configure.ac when using autoheader 2.62.
58: AH_VERBATIM([USE_SYSTEM_EXTENSIONS],
59: [/* Enable extensions on AIX 3, Interix. */
60: #ifndef _ALL_SOURCE
61: # undef _ALL_SOURCE
62: #endif
63: /* Enable general extensions on macOS. */
64: #ifndef _DARWIN_C_SOURCE
65: # undef _DARWIN_C_SOURCE
66: #endif
67: /* Enable GNU extensions on systems that have them. */
68: #ifndef _GNU_SOURCE
69: # undef _GNU_SOURCE
70: #endif
71: /* Enable NetBSD extensions on NetBSD. */
72: #ifndef _NETBSD_SOURCE
73: # undef _NETBSD_SOURCE
74: #endif
75: /* Enable OpenBSD extensions on NetBSD. */
76: #ifndef _OPENBSD_SOURCE
77: # undef _OPENBSD_SOURCE
78: #endif
79: /* Enable threading extensions on Solaris. */
80: #ifndef _POSIX_PTHREAD_SEMANTICS
81: # undef _POSIX_PTHREAD_SEMANTICS
82: #endif
83: /* Enable extensions specified by ISO/IEC TS 18661-5:2014. */
84: #ifndef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
85: # undef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
86: #endif
87: /* Enable extensions specified by ISO/IEC TS 18661-1:2014. */
88: #ifndef __STDC_WANT_IEC_60559_BFP_EXT__
89: # undef __STDC_WANT_IEC_60559_BFP_EXT__
90: #endif
91: /* Enable extensions specified by ISO/IEC TS 18661-2:2015. */
92: #ifndef __STDC_WANT_IEC_60559_DFP_EXT__
93: # undef __STDC_WANT_IEC_60559_DFP_EXT__
94: #endif
95: /* Enable extensions specified by ISO/IEC TS 18661-4:2015. */
96: #ifndef __STDC_WANT_IEC_60559_FUNCS_EXT__
97: # undef __STDC_WANT_IEC_60559_FUNCS_EXT__
98: #endif
99: /* Enable extensions specified by ISO/IEC TS 18661-3:2015. */
100: #ifndef __STDC_WANT_IEC_60559_TYPES_EXT__
101: # undef __STDC_WANT_IEC_60559_TYPES_EXT__
102: #endif
103: /* Enable extensions specified by ISO/IEC TR 24731-2:2010. */
104: #ifndef __STDC_WANT_LIB_EXT2__
105: # undef __STDC_WANT_LIB_EXT2__
106: #endif
107: /* Enable extensions specified by ISO/IEC 24747:2009. */
108: #ifndef __STDC_WANT_MATH_SPEC_FUNCS__
109: # undef __STDC_WANT_MATH_SPEC_FUNCS__
110: #endif
111: /* Enable extensions on HP NonStop. */
112: #ifndef _TANDEM_SOURCE
113: # undef _TANDEM_SOURCE
114: #endif
115: /* Enable X/Open extensions if necessary. HP-UX 11.11 defines
116: mbstate_t only if _XOPEN_SOURCE is defined to 500, regardless of
117: whether compiling with -Ae or -D_HPUX_SOURCE=1. */
118: #ifndef _XOPEN_SOURCE
119: # undef _XOPEN_SOURCE
120: #endif
121: /* Enable X/Open compliant socket functions that do not require linking
122: with -lxnet on HP-UX 11.11. */
123: #ifndef _HPUX_ALT_XOPEN_SOCKET_API
124: # undef _HPUX_ALT_XOPEN_SOCKET_API
125: #endif
126: /* Enable general extensions on Solaris. */
127: #ifndef __EXTENSIONS__
128: # undef __EXTENSIONS__
129: #endif
130: ])
131: AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
132: [ac_cv_safe_to_define___extensions__],
133: [AC_COMPILE_IFELSE(
134: [AC_LANG_PROGRAM([[
135: # define __EXTENSIONS__ 1
136: ]AC_INCLUDES_DEFAULT])],
137: [ac_cv_safe_to_define___extensions__=yes],
138: [ac_cv_safe_to_define___extensions__=no])])
139: test $ac_cv_safe_to_define___extensions__ = yes &&
140: AC_DEFINE([__EXTENSIONS__])
141: AC_DEFINE([_ALL_SOURCE])
142: AC_DEFINE([_DARWIN_C_SOURCE])
143: AC_DEFINE([_GNU_SOURCE])
144: AC_DEFINE([_NETBSD_SOURCE])
145: AC_DEFINE([_OPENBSD_SOURCE])
146: AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
147: AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__])
148: AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__])
149: AC_DEFINE([__STDC_WANT_IEC_60559_DFP_EXT__])
150: AC_DEFINE([__STDC_WANT_IEC_60559_FUNCS_EXT__])
151: AC_DEFINE([__STDC_WANT_IEC_60559_TYPES_EXT__])
152: AC_DEFINE([__STDC_WANT_LIB_EXT2__])
153: AC_DEFINE([__STDC_WANT_MATH_SPEC_FUNCS__])
154: AC_DEFINE([_TANDEM_SOURCE])
155: AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined],
156: [ac_cv_should_define__xopen_source],
157: [ac_cv_should_define__xopen_source=no
158: AC_COMPILE_IFELSE(
159: [AC_LANG_PROGRAM([[
160: #include <wchar.h>
161: mbstate_t x;]])],
162: [],
163: [AC_COMPILE_IFELSE(
164: [AC_LANG_PROGRAM([[
165: #define _XOPEN_SOURCE 500
166: #include <wchar.h>
167: mbstate_t x;]])],
168: [ac_cv_should_define__xopen_source=yes])])])
169: test $ac_cv_should_define__xopen_source = yes &&
170: AC_DEFINE([_XOPEN_SOURCE], [500])
171: AC_DEFINE([_HPUX_ALT_XOPEN_SOCKET_API])
172: ])# AC_USE_SYSTEM_EXTENSIONS
173:
174: # gl_USE_SYSTEM_EXTENSIONS
175: # ------------------------
176: # Enable extensions on systems that normally disable them,
177: # typically due to standards-conformance issues.
178: AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
179: [
180: dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
181: dnl gnulib does not need it. But if it gets required by third-party macros
182: dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
183: dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
184: dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
185: dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.
186: AC_REQUIRE([AC_GNU_SOURCE])
187:
188: AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
189: ])
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