|
0
|
1 # serial 5 -*- Autoconf -*-
|
|
|
2 # Enable extensions on systems that normally disable them.
|
|
|
3
|
|
|
4 # Copyright (C) 2003, 2006, 2007 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 # 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__).
|
|
|
23 AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
|
|
|
24 [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
|
|
|
25 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
|
|
|
26
|
|
|
27 AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
|
|
|
28 if test "$MINIX" = yes; then
|
|
|
29 AC_DEFINE([_POSIX_SOURCE], [1],
|
|
|
30 [Define to 1 if you need to in order for `stat' and other
|
|
|
31 things to work.])
|
|
|
32 AC_DEFINE([_POSIX_1_SOURCE], [2],
|
|
|
33 [Define to 2 if the system does not provide POSIX.1 features
|
|
|
34 except with this defined.])
|
|
|
35 AC_DEFINE([_MINIX], [1],
|
|
|
36 [Define to 1 if on MINIX.])
|
|
|
37 fi
|
|
|
38
|
|
|
39 AH_VERBATIM([__EXTENSIONS__],
|
|
|
40 [/* Enable extensions on AIX 3, Interix. */
|
|
|
41 #ifndef _ALL_SOURCE
|
|
|
42 # undef _ALL_SOURCE
|
|
|
43 #endif
|
|
|
44 /* Enable GNU extensions on systems that have them. */
|
|
|
45 #ifndef _GNU_SOURCE
|
|
|
46 # undef _GNU_SOURCE
|
|
|
47 #endif
|
|
|
48 /* Enable threading extensions on Solaris. */
|
|
|
49 #ifndef _POSIX_PTHREAD_SEMANTICS
|
|
|
50 # undef _POSIX_PTHREAD_SEMANTICS
|
|
|
51 #endif
|
|
|
52 /* Enable extensions on HP NonStop. */
|
|
|
53 #ifndef _TANDEM_SOURCE
|
|
|
54 # undef _TANDEM_SOURCE
|
|
|
55 #endif
|
|
|
56 /* Enable general extensions on Solaris. */
|
|
|
57 #ifndef __EXTENSIONS__
|
|
|
58 # undef __EXTENSIONS__
|
|
|
59 #endif
|
|
|
60 ])
|
|
|
61 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
|
|
|
62 [ac_cv_safe_to_define___extensions__],
|
|
|
63 [AC_COMPILE_IFELSE(
|
|
|
64 [AC_LANG_PROGRAM([
|
|
|
65 # define __EXTENSIONS__ 1
|
|
|
66 AC_INCLUDES_DEFAULT])],
|
|
|
67 [ac_cv_safe_to_define___extensions__=yes],
|
|
|
68 [ac_cv_safe_to_define___extensions__=no])])
|
|
|
69 test $ac_cv_safe_to_define___extensions__ = yes &&
|
|
|
70 AC_DEFINE([__EXTENSIONS__])
|
|
|
71 AC_DEFINE([_ALL_SOURCE])
|
|
|
72 AC_DEFINE([_GNU_SOURCE])
|
|
|
73 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
|
|
|
74 AC_DEFINE([_TANDEM_SOURCE])
|
|
|
75 ])# AC_USE_SYSTEM_EXTENSIONS
|
|
|
76
|
