Fix: tap array subscript has type char warning
[urcu.git] / m4 / ax_tls.m4
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a767fdc3 1# ===========================================================================
8ca861a5 2# https://www.gnu.org/software/autoconf-archive/ax_tls.html
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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)
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12# extensions. Defines TLS if it is found. Currently knows about C++11,
13# GCC/ICC, and MSVC. I think SunPro uses the same as GCC, and Borland
14# apparently supports either.
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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
8ca861a5 32# with this program. If not, see <https://www.gnu.org/licenses/>.
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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
8ca861a5 47#serial 14
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48
49AC_DEFUN([AX_TLS], [
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50 AC_MSG_CHECKING([for thread local storage (TLS) class])
51 AC_CACHE_VAL([ac_cv_tls],
52 [for ax_tls_keyword in thread_local _Thread_local __thread '__declspec(thread)' none; do
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53 AS_CASE([$ax_tls_keyword],
54 [none], [ac_cv_tls=none ; break],
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55 [AC_TRY_COMPILE(
56 [#include <stdlib.h>
57 static void
58 foo(void) {
59 static ] $ax_tls_keyword [ int bar;
60 exit(1);
61 }],
62 [],
a767fdc3 63 [ac_cv_tls=$ax_tls_keyword ; break],
8ca861a5 64 ac_cv_tls=none
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65 )])
66 done
67 ])
8ca861a5 68 AC_MSG_RESULT([$ac_cv_tls])
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69
70 AS_IF([test "$ac_cv_tls" != "none"],
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71 [AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class define it to that here])
72 m4_ifnblank([$1],[$1])],
73 [m4_ifnblank([$2],[$2])])
a767fdc3 74])
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