Fix: tests: invoke destroy APIs for queues/stacks
[urcu.git] / m4 / 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
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47#serial 11
48
49# Define m4_ifblank and m4_ifnblank macros from introduced in
50# autotools 2.64 m4sugar.m4 if using an earlier autotools.
51
52ifdef([m4_ifblank], [], [
53m4_define([m4_ifblank],
54[m4_if(m4_translit([[$1]], [ ][ ][
55]), [], [$2], [$3])])
56])
57
58
59ifdef([m4_ifnblank], [], [
60m4_define([m4_ifnblank],
61[m4_if(m4_translit([[$1]], [ ][ ][
62]), [], [$3], [$2])])
63])
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64
65AC_DEFUN([AX_TLS], [
66 AC_MSG_CHECKING(for thread local storage (TLS) class)
67 AC_CACHE_VAL(ac_cv_tls, [
68 ax_tls_keywords="__thread __declspec(thread) none"
69 for ax_tls_keyword in $ax_tls_keywords; do
70 AS_CASE([$ax_tls_keyword],
71 [none], [ac_cv_tls=none ; break],
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72 [AC_TRY_LINK(
73 [$ax_tls_keyword int foo;],
74 [++foo;],
a767fdc3 75 [ac_cv_tls=$ax_tls_keyword ; break],
75478b32 76 [ac_cv_tls=none]
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77 )])
78 done
79 ])
80 AC_MSG_RESULT($ac_cv_tls)
81
82 AS_IF([test "$ac_cv_tls" != "none"],
83 AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
84 m4_ifnblank([$1], [$1]),
85 m4_ifnblank([$2], [$2])
86 )
87])
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