1 # serial 3 -*- 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 # The main body of this macro is stolen from CVS Autoconf. Perhaps we
10 # can replace it with AC_USE_SYSTEM_EXTENSIONS once we can assume
11 # Autoconf 2.61 or later everywhere, but since CVS Autoconf mutates
12 # rapidly enough in this area it's likely that we'll need
13 # gl_USE_SYSTEM_EXTENSIONS for quite some time.
17 # gl_USE_SYSTEM_EXTENSIONS
18 # ------------------------
19 # Enable extensions on systems that normally disable them,
20 # typically due to standards-conformance issues.
21 AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
23 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
24 AC_BEFORE([$0], [AC_RUN_IFELSE])
26 AC_REQUIRE([AC_GNU_SOURCE])
28 AC_REQUIRE([AC_MINIX])
30 AH_VERBATIM([__EXTENSIONS__],
31 [/* Enable extensions on Solaris. */
32 #ifndef __EXTENSIONS__
33 # undef __EXTENSIONS__
35 #ifndef _POSIX_PTHREAD_SEMANTICS
36 # undef _POSIX_PTHREAD_SEMANTICS
38 #ifndef _TANDEM_SOURCE
39 # undef _TANDEM_SOURCE
41 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
42 [gl_cv_safe_to_define___extensions__],
45 # define __EXTENSIONS__ 1
46 AC_INCLUDES_DEFAULT])],
47 [gl_cv_safe_to_define___extensions__=yes],
48 [gl_cv_safe_to_define___extensions__=no])])
49 test $gl_cv_safe_to_define___extensions__ = yes &&
50 AC_DEFINE([__EXTENSIONS__])
51 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
52 AC_DEFINE([_TANDEM_SOURCE])