1 # serial 4 -*- Autoconf -*-
2 # Enable extensions on systems that normally disable them.
4 # Copyright (C) 2003, 2006 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.
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 # 2.61 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.
15 # AC_USE_SYSTEM_EXTENSIONS
16 # ------------------------
17 # Enable extensions on systems that normally disable them,
18 # typically due to standards-conformance issues.
19 AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
21 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
22 AC_BEFORE([$0], [AC_RUN_IFELSE])
24 AC_REQUIRE([AC_GNU_SOURCE])
26 AC_REQUIRE([AC_MINIX])
28 AH_VERBATIM([__EXTENSIONS__],
29 [/* Enable extensions on Solaris. */
30 #ifndef __EXTENSIONS__
31 # undef __EXTENSIONS__
33 #ifndef _POSIX_PTHREAD_SEMANTICS
34 # undef _POSIX_PTHREAD_SEMANTICS
36 #ifndef _TANDEM_SOURCE
37 # undef _TANDEM_SOURCE
39 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
40 [ac_cv_safe_to_define___extensions__],
43 # define __EXTENSIONS__ 1
44 AC_INCLUDES_DEFAULT])],
45 [ac_cv_safe_to_define___extensions__=yes],
46 [ac_cv_safe_to_define___extensions__=no])])
47 test $ac_cv_safe_to_define___extensions__ = yes &&
48 AC_DEFINE([__EXTENSIONS__])
49 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
50 AC_DEFINE([_TANDEM_SOURCE])
53 # gl_USE_SYSTEM_EXTENSIONS
54 # ------------------------
55 # Enable extensions on systems that normally disable them,
56 # typically due to standards-conformance issues.
57 AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
58 [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])])