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comparison m4/extensions.m4 @ 421:3c2e1f24cc7d 3.0-beta2
Added generated files for release
author | lost@l-w.ca |
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date | Sun, 19 Sep 2010 01:33:24 -0600 |
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420:7366deedfa85 | 421:3c2e1f24cc7d |
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1 # serial 9 -*- Autoconf -*- | |
2 # Enable extensions on systems that normally disable them. | |
3 | |
4 # Copyright (C) 2003, 2006-2010 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 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 # 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 # Remember that #undef in AH_VERBATIM gets replaced with #define by | |
34 # AC_DEFINE. The goal here is to define all known feature-enabling | |
35 # macros, then, if reports of conflicts are made, disable macros that | |
36 # cause problems on some platforms (such as __EXTENSIONS__). | |
37 AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], | |
38 [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl | |
39 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl | |
40 | |
41 AC_REQUIRE([AC_CANONICAL_HOST]) | |
42 | |
43 AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) | |
44 if test "$MINIX" = yes; then | |
45 AC_DEFINE([_POSIX_SOURCE], [1], | |
46 [Define to 1 if you need to in order for `stat' and other | |
47 things to work.]) | |
48 AC_DEFINE([_POSIX_1_SOURCE], [2], | |
49 [Define to 2 if the system does not provide POSIX.1 features | |
50 except with this defined.]) | |
51 AC_DEFINE([_MINIX], [1], | |
52 [Define to 1 if on MINIX.]) | |
53 fi | |
54 | |
55 dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500, | |
56 dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already | |
57 dnl provided. | |
58 case "$host_os" in | |
59 hpux*) | |
60 AC_DEFINE([_XOPEN_SOURCE], [500], | |
61 [Define to 500 only on HP-UX.]) | |
62 ;; | |
63 esac | |
64 | |
65 AH_VERBATIM([__EXTENSIONS__], | |
66 [/* Enable extensions on AIX 3, Interix. */ | |
67 #ifndef _ALL_SOURCE | |
68 # undef _ALL_SOURCE | |
69 #endif | |
70 /* Enable GNU extensions on systems that have them. */ | |
71 #ifndef _GNU_SOURCE | |
72 # undef _GNU_SOURCE | |
73 #endif | |
74 /* Enable threading extensions on Solaris. */ | |
75 #ifndef _POSIX_PTHREAD_SEMANTICS | |
76 # undef _POSIX_PTHREAD_SEMANTICS | |
77 #endif | |
78 /* Enable extensions on HP NonStop. */ | |
79 #ifndef _TANDEM_SOURCE | |
80 # undef _TANDEM_SOURCE | |
81 #endif | |
82 /* Enable general extensions on Solaris. */ | |
83 #ifndef __EXTENSIONS__ | |
84 # undef __EXTENSIONS__ | |
85 #endif | |
86 ]) | |
87 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], | |
88 [ac_cv_safe_to_define___extensions__], | |
89 [AC_COMPILE_IFELSE( | |
90 [AC_LANG_PROGRAM([[ | |
91 # define __EXTENSIONS__ 1 | |
92 ]AC_INCLUDES_DEFAULT])], | |
93 [ac_cv_safe_to_define___extensions__=yes], | |
94 [ac_cv_safe_to_define___extensions__=no])]) | |
95 test $ac_cv_safe_to_define___extensions__ = yes && | |
96 AC_DEFINE([__EXTENSIONS__]) | |
97 AC_DEFINE([_ALL_SOURCE]) | |
98 AC_DEFINE([_GNU_SOURCE]) | |
99 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) | |
100 AC_DEFINE([_TANDEM_SOURCE]) | |
101 ])# AC_USE_SYSTEM_EXTENSIONS | |
102 | |
103 # gl_USE_SYSTEM_EXTENSIONS | |
104 # ------------------------ | |
105 # Enable extensions on systems that normally disable them, | |
106 # typically due to standards-conformance issues. | |
107 AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], | |
108 [ | |
109 dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. | |
110 dnl gnulib does not need it. But if it gets required by third-party macros | |
111 dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a | |
112 dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". | |
113 dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, | |
114 dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. | |
115 AC_REQUIRE([AC_GNU_SOURCE]) | |
116 | |
117 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) | |
118 ]) |