1 # Enable extensions on systems that normally disable them.
3 # Copyright (C) 2003, 2006 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
8 # This file is only needed in autoconf <= 2.59. Newer versions of autoconf
9 # have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics.
11 # gl_USE_SYSTEM_EXTENSIONS
12 # ------------------------
13 # Enable extensions on systems that normally disable them,
14 # typically due to standards-conformance issues.
15 AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [
16 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
17 AC_BEFORE([$0], [AC_RUN_IFELSE])
19 AC_REQUIRE([AC_GNU_SOURCE])
21 AC_REQUIRE([AC_MINIX])
23 AH_VERBATIM([__EXTENSIONS__],
24 [/* Enable extensions on Solaris. */
25 #ifndef __EXTENSIONS__
26 # undef __EXTENSIONS__
28 #ifndef _POSIX_PTHREAD_SEMANTICS
29 # undef _POSIX_PTHREAD_SEMANTICS
31 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
32 [ac_cv_safe_to_define___extensions__],
35 #define __EXTENSIONS__ 1
36 AC_INCLUDES_DEFAULT])],
37 [ac_cv_safe_to_define___extensions__=yes],
38 [ac_cv_safe_to_define___extensions__=no])])
39 test $ac_cv_safe_to_define___extensions__ = yes &&
40 AC_DEFINE([__EXTENSIONS__])
41 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])