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author | Nils Durner <durner@gnunet.org> | 2011-02-21 20:41:06 +0000 |
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committer | Nils Durner <durner@gnunet.org> | 2011-02-21 20:41:06 +0000 |
commit | 31dbbcdffc2544a63628d357d9e3a2655f6d8f77 (patch) | |
tree | 9b703a965ec6d3ccca4bf330b49017b2a414a8e9 /m4/extensions.m4 | |
parent | b35e4e090c6bfcc6eb5cc5ba4f563b1a91749b65 (diff) | |
download | gnunet-31dbbcdffc2544a63628d357d9e3a2655f6d8f77.tar.gz gnunet-31dbbcdffc2544a63628d357d9e3a2655f6d8f77.zip |
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Diffstat (limited to 'm4/extensions.m4')
-rw-r--r-- | m4/extensions.m4 | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/m4/extensions.m4 b/m4/extensions.m4 new file mode 100644 index 000000000..1330503f0 --- /dev/null +++ b/m4/extensions.m4 | |||
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1 | # serial 9 -*- Autoconf -*- | ||
2 | # Enable extensions on systems that normally disable them. | ||
3 | |||
4 | # Copyright (C) 2003, 2006-2011 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 | ]) | ||