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8376d87e | 1 | # serial 13 -*- Autoconf -*- |
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2 | # Enable extensions on systems that normally disable them. |
3 | ||
ba318903 | 4 | # Copyright (C) 2003, 2006-2014 Free Software Foundation, Inc. |
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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 | ||
ad643710 | 9 | # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from git |
1fd182f0 | 10 | # Autoconf. Perhaps we can remove this once we can assume Autoconf |
8376d87e | 11 | # 2.70 or later everywhere, but since Autoconf mutates rapidly |
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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. | |
8376d87e | 33 | # |
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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([$0], [AC_RUN_IFELSE])dnl | |
41 | ||
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42 | AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) |
43 | if test "$MINIX" = yes; then | |
44 | AC_DEFINE([_POSIX_SOURCE], [1], | |
caf8a9b2 | 45 | [Define to 1 if you need to in order for 'stat' and other |
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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.]) | |
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52 | AC_DEFINE([_NETBSD_SOURCE], [1], |
53 | [Define to 1 to make NetBSD features available. MINIX 3 needs this.]) | |
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54 | fi |
55 | ||
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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], | |
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59 | [/* Enable extensions on AIX 3, Interix. */ |
60 | #ifndef _ALL_SOURCE | |
61 | # undef _ALL_SOURCE | |
62 | #endif | |
8376d87e | 63 | /* Enable general extensions on OS X. */ |
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64 | #ifndef _DARWIN_C_SOURCE |
65 | # undef _DARWIN_C_SOURCE | |
66 | #endif | |
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67 | /* Enable GNU extensions on systems that have them. */ |
68 | #ifndef _GNU_SOURCE | |
69 | # undef _GNU_SOURCE | |
70 | #endif | |
71 | /* Enable threading extensions on Solaris. */ | |
72 | #ifndef _POSIX_PTHREAD_SEMANTICS | |
73 | # undef _POSIX_PTHREAD_SEMANTICS | |
74 | #endif | |
75 | /* Enable extensions on HP NonStop. */ | |
76 | #ifndef _TANDEM_SOURCE | |
77 | # undef _TANDEM_SOURCE | |
78 | #endif | |
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79 | /* Enable X/Open extensions if necessary. HP-UX 11.11 defines |
80 | mbstate_t only if _XOPEN_SOURCE is defined to 500, regardless of | |
81 | whether compiling with -Ae or -D_HPUX_SOURCE=1. */ | |
82 | #ifndef _XOPEN_SOURCE | |
83 | # undef _XOPEN_SOURCE | |
84 | #endif | |
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85 | /* Enable general extensions on Solaris. */ |
86 | #ifndef __EXTENSIONS__ | |
87 | # undef __EXTENSIONS__ | |
88 | #endif | |
89 | ]) | |
90 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], | |
91 | [ac_cv_safe_to_define___extensions__], | |
92 | [AC_COMPILE_IFELSE( | |
93 | [AC_LANG_PROGRAM([[ | |
94 | # define __EXTENSIONS__ 1 | |
95 | ]AC_INCLUDES_DEFAULT])], | |
96 | [ac_cv_safe_to_define___extensions__=yes], | |
97 | [ac_cv_safe_to_define___extensions__=no])]) | |
98 | test $ac_cv_safe_to_define___extensions__ = yes && | |
99 | AC_DEFINE([__EXTENSIONS__]) | |
100 | AC_DEFINE([_ALL_SOURCE]) | |
24e0f6b1 | 101 | AC_DEFINE([_DARWIN_C_SOURCE]) |
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102 | AC_DEFINE([_GNU_SOURCE]) |
103 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) | |
104 | AC_DEFINE([_TANDEM_SOURCE]) | |
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105 | AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined], |
106 | [ac_cv_should_define__xopen_source], | |
107 | [ac_cv_should_define__xopen_source=no | |
108 | AC_COMPILE_IFELSE( | |
109 | [AC_LANG_PROGRAM([[ | |
110 | #include <wchar.h> | |
111 | mbstate_t x;]])], | |
112 | [], | |
113 | [AC_COMPILE_IFELSE( | |
114 | [AC_LANG_PROGRAM([[ | |
115 | #define _XOPEN_SOURCE 500 | |
116 | #include <wchar.h> | |
117 | mbstate_t x;]])], | |
118 | [ac_cv_should_define__xopen_source=yes])])]) | |
119 | test $ac_cv_should_define__xopen_source = yes && | |
120 | AC_DEFINE([_XOPEN_SOURCE], [500]) | |
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121 | ])# AC_USE_SYSTEM_EXTENSIONS |
122 | ||
123 | # gl_USE_SYSTEM_EXTENSIONS | |
124 | # ------------------------ | |
125 | # Enable extensions on systems that normally disable them, | |
126 | # typically due to standards-conformance issues. | |
127 | AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], | |
128 | [ | |
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]) | |
138 | ]) |