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f240aacb | 1 | # serial 8 -*- Autoconf -*- |
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2 | # Enable extensions on systems that normally disable them. |
3 | ||
f240aacb | 4 | # Copyright (C) 2003, 2006-2009 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 | ||
9 | # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS | |
10 | # Autoconf. Perhaps we can remove this once we can assume Autoconf | |
11 | # 2.62 or later everywhere, but since CVS 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 | # AC_USE_SYSTEM_EXTENSIONS | |
16 | # ------------------------ | |
17 | # Enable extensions on systems that normally disable them, | |
18 | # typically due to standards-conformance issues. | |
19 | # Remember that #undef in AH_VERBATIM gets replaced with #define by | |
20 | # AC_DEFINE. The goal here is to define all known feature-enabling | |
21 | # macros, then, if reports of conflicts are made, disable macros that | |
22 | # cause problems on some platforms (such as __EXTENSIONS__). | |
f240aacb | 23 | AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], |
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24 | [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl |
25 | AC_BEFORE([$0], [AC_RUN_IFELSE])dnl | |
26 | ||
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27 | AC_REQUIRE([AC_CANONICAL_HOST]) |
28 | ||
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29 | AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) |
30 | if test "$MINIX" = yes; then | |
31 | AC_DEFINE([_POSIX_SOURCE], [1], | |
32 | [Define to 1 if you need to in order for `stat' and other | |
33 | things to work.]) | |
34 | AC_DEFINE([_POSIX_1_SOURCE], [2], | |
35 | [Define to 2 if the system does not provide POSIX.1 features | |
36 | except with this defined.]) | |
37 | AC_DEFINE([_MINIX], [1], | |
38 | [Define to 1 if on MINIX.]) | |
39 | fi | |
40 | ||
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41 | dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500, |
42 | dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already | |
43 | dnl provided. | |
44 | case "$host_os" in | |
45 | hpux*) | |
46 | AC_DEFINE([_XOPEN_SOURCE], [500], | |
47 | [Define to 500 only on HP-UX.]) | |
48 | ;; | |
49 | esac | |
50 | ||
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51 | AH_VERBATIM([__EXTENSIONS__], |
52 | [/* Enable extensions on AIX 3, Interix. */ | |
53 | #ifndef _ALL_SOURCE | |
54 | # undef _ALL_SOURCE | |
55 | #endif | |
56 | /* Enable GNU extensions on systems that have them. */ | |
57 | #ifndef _GNU_SOURCE | |
58 | # undef _GNU_SOURCE | |
59 | #endif | |
60 | /* Enable threading extensions on Solaris. */ | |
61 | #ifndef _POSIX_PTHREAD_SEMANTICS | |
62 | # undef _POSIX_PTHREAD_SEMANTICS | |
63 | #endif | |
64 | /* Enable extensions on HP NonStop. */ | |
65 | #ifndef _TANDEM_SOURCE | |
66 | # undef _TANDEM_SOURCE | |
67 | #endif | |
68 | /* Enable general extensions on Solaris. */ | |
69 | #ifndef __EXTENSIONS__ | |
70 | # undef __EXTENSIONS__ | |
71 | #endif | |
72 | ]) | |
73 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], | |
74 | [ac_cv_safe_to_define___extensions__], | |
75 | [AC_COMPILE_IFELSE( | |
76 | [AC_LANG_PROGRAM([[ | |
77 | # define __EXTENSIONS__ 1 | |
78 | ]AC_INCLUDES_DEFAULT])], | |
79 | [ac_cv_safe_to_define___extensions__=yes], | |
80 | [ac_cv_safe_to_define___extensions__=no])]) | |
81 | test $ac_cv_safe_to_define___extensions__ = yes && | |
82 | AC_DEFINE([__EXTENSIONS__]) | |
83 | AC_DEFINE([_ALL_SOURCE]) | |
84 | AC_DEFINE([_GNU_SOURCE]) | |
85 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) | |
86 | AC_DEFINE([_TANDEM_SOURCE]) | |
87 | ])# AC_USE_SYSTEM_EXTENSIONS | |
88 | ||
89 | # gl_USE_SYSTEM_EXTENSIONS | |
90 | # ------------------------ | |
91 | # Enable extensions on systems that normally disable them, | |
92 | # typically due to standards-conformance issues. | |
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93 | AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], |
94 | [ | |
95 | dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. | |
96 | dnl gnulib does not need it. But if it gets required by third-party macros | |
97 | dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a | |
98 | dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". | |
99 | dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, | |
100 | dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. | |
101 | AC_REQUIRE([AC_GNU_SOURCE]) | |
102 | ||
103 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) | |
104 | ]) |