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authorNils Durner <durner@gnunet.org>2011-02-21 20:41:06 +0000
committerNils Durner <durner@gnunet.org>2011-02-21 20:41:06 +0000
commit31dbbcdffc2544a63628d357d9e3a2655f6d8f77 (patch)
tree9b703a965ec6d3ccca4bf330b49017b2a414a8e9 /m4/extensions.m4
parentb35e4e090c6bfcc6eb5cc5ba4f563b1a91749b65 (diff)
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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__).
37AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
38[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
39AC_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.
107AC_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])