1 # serial 2 -*- 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 file is only needed in autoconf <= 2.59. Newer versions of autoconf
10 # have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics.
12 # gl_USE_SYSTEM_EXTENSIONS
13 # ------------------------
14 # Enable extensions on systems that normally disable them,
15 # typically due to standards-conformance issues.
16 m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
17 [AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
18 [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])])],
19 [AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [
20 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
21 AC_BEFORE([$0], [AC_RUN_IFELSE])
23 AC_REQUIRE([AC_GNU_SOURCE])
25 AC_REQUIRE([AC_MINIX])
27 AH_VERBATIM([__EXTENSIONS__],
28 [/* Enable extensions on Solaris. */
29 #ifndef __EXTENSIONS__
30 # undef __EXTENSIONS__
32 #ifndef _POSIX_PTHREAD_SEMANTICS
33 # undef _POSIX_PTHREAD_SEMANTICS
35 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
36 [ac_cv_safe_to_define___extensions__],
39 #define __EXTENSIONS__ 1
40 AC_INCLUDES_DEFAULT])],
41 [ac_cv_safe_to_define___extensions__=yes],
42 [ac_cv_safe_to_define___extensions__=no])])
43 test $ac_cv_safe_to_define___extensions__ = yes &&
44 AC_DEFINE([__EXTENSIONS__])
45 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])