Fix c99 compatibility: use __asm__ and __volatile__ in public headers
[urcu.git] / config / ax_tls.m4
... / ...
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1# ===========================================================================
2# http://www.gnu.org/software/autoconf-archive/ax_tls.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_TLS([action-if-found], [action-if-not-found])
8#
9# DESCRIPTION
10#
11# Provides a test for the compiler support of thread local storage (TLS)
12# extensions. Defines TLS if it is found. Currently knows about GCC/ICC
13# and MSVC. I think SunPro uses the same as GCC, and Borland apparently
14# supports either.
15#
16# LICENSE
17#
18# Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk>
19# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
20#
21# This program is free software: you can redistribute it and/or modify it
22# under the terms of the GNU General Public License as published by the
23# Free Software Foundation, either version 3 of the License, or (at your
24# option) any later version.
25#
26# This program is distributed in the hope that it will be useful, but
27# WITHOUT ANY WARRANTY; without even the implied warranty of
28# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
29# Public License for more details.
30#
31# You should have received a copy of the GNU General Public License along
32# with this program. If not, see <http://www.gnu.org/licenses/>.
33#
34# As a special exception, the respective Autoconf Macro's copyright owner
35# gives unlimited permission to copy, distribute and modify the configure
36# scripts that are the output of Autoconf when processing the Macro. You
37# need not follow the terms of the GNU General Public License when using
38# or distributing such scripts, even though portions of the text of the
39# Macro appear in them. The GNU General Public License (GPL) does govern
40# all other use of the material that constitutes the Autoconf Macro.
41#
42# This special exception to the GPL applies to versions of the Autoconf
43# Macro released by the Autoconf Archive. When you make and distribute a
44# modified version of the Autoconf Macro, you may extend this special
45# exception to the GPL to apply to your modified version as well.
46
47#serial 10
48
49AC_DEFUN([AX_TLS], [
50 AC_MSG_CHECKING(for thread local storage (TLS) class)
51 AC_CACHE_VAL(ac_cv_tls, [
52 ax_tls_keywords="__thread __declspec(thread) none"
53 for ax_tls_keyword in $ax_tls_keywords; do
54 AS_CASE([$ax_tls_keyword],
55 [none], [ac_cv_tls=none ; break],
56 [AC_TRY_COMPILE(
57 [#include <stdlib.h>
58 static void
59 foo(void) {
60 static ] $ax_tls_keyword [ int bar;
61 exit(1);
62 }],
63 [],
64 [ac_cv_tls=$ax_tls_keyword ; break],
65 ac_cv_tls=none
66 )])
67 done
68 ])
69 AC_MSG_RESULT($ac_cv_tls)
70
71 AS_IF([test "$ac_cv_tls" != "none"],
72 AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
73 m4_ifnblank([$1], [$1]),
74 m4_ifnblank([$2], [$2])
75 )
76])
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