1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
# serial 13 -*- Autoconf -*-
# Enable extensions on systems that normally disable them.
# Copyright (C) 2003, 2006-2013 Free Software Foundation, Inc.
# 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 git
# Autoconf. Perhaps we can remove this once we can assume Autoconf
# 2.70 or later everywhere, but since Autoconf mutates rapidly
# enough in this area it's likely we'll need to redefine
# AC_USE_SYSTEM_EXTENSIONS for quite some time.
# 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.
# 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__).
AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
if test "$MINIX" = yes; then
AC_DEFINE([_POSIX_SOURCE], [1],
[Define to 1 if you need to in order for 'stat' and other
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.])
AC_DEFINE([_NETBSD_SOURCE], [1],
[Define to 1 to make NetBSD features available. MINIX 3 needs this.])
fi
dnl Use a different key than __EXTENSIONS__, as that name broke existing
dnl configure.ac when using autoheader 2.62.
AH_VERBATIM([USE_SYSTEM_EXTENSIONS],
[/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable general extensions on OS X. */
#ifndef _DARWIN_C_SOURCE
# undef _DARWIN_C_SOURCE
#endif
/* 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 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. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
])
AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
[ac_cv_safe_to_define___extensions__],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
# define __EXTENSIONS__ 1
]AC_INCLUDES_DEFAULT])],
[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])
AC_DEFINE([_DARWIN_C_SOURCE])
AC_DEFINE([_GNU_SOURCE])
AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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
# gl_USE_SYSTEM_EXTENSIONS
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
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])
])
|
