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 # gl_USE_SYSTEM_EXTENSIONS
9 # ------------------------
10 # Enable extensions on systems that normally disable them,
11 # typically due to standards-conformance issues.
12 AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [
13 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
14 AC_BEFORE([$0], [AC_RUN_IFELSE])
16 AC_REQUIRE([AC_GNU_SOURCE])
18 AC_REQUIRE([AC_MINIX])
20 AH_VERBATIM([__EXTENSIONS__],
21 [/* Enable extensions on Solaris. */
22 #ifndef __EXTENSIONS__
23 # undef __EXTENSIONS__
25 #ifndef _POSIX_PTHREAD_SEMANTICS
26 # undef _POSIX_PTHREAD_SEMANTICS
28 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
29 [ac_cv_safe_to_define___extensions__],
32 #define __EXTENSIONS__ 1
33 AC_INCLUDES_DEFAULT])],
34 [ac_cv_safe_to_define___extensions__=yes],
35 [ac_cv_safe_to_define___extensions__=no])])
36 test $ac_cv_safe_to_define___extensions__ = yes &&
37 AC_DEFINE([__EXTENSIONS__])
38 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])