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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_tls.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_TLS([action-if-found], [action-if-not-found])
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#
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# DESCRIPTION
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#
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# Provides a test for the compiler support of thread local storage (TLS)
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# extensions. Defines TLS if it is found. Currently knows about C++11,
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# GCC/ICC, and MSVC. I think SunPro uses the same as GCC, and Borland
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# apparently supports either.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk>
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# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 14
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AC_DEFUN([AX_TLS], [
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AC_MSG_CHECKING([for thread local storage (TLS) class])
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AC_CACHE_VAL([ac_cv_tls],
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[for ax_tls_keyword in thread_local _Thread_local __thread '__declspec(thread)' none; do
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AS_CASE([$ax_tls_keyword],
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[none], [ac_cv_tls=none ; break],
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[AC_TRY_COMPILE(
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[#include <stdlib.h>
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static void
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foo(void) {
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static ] $ax_tls_keyword [ int bar;
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exit(1);
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}],
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[],
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[ac_cv_tls=$ax_tls_keyword ; break],
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ac_cv_tls=none
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)])
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done
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])
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AC_MSG_RESULT([$ac_cv_tls])
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AS_IF([test "$ac_cv_tls" != "none"],
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[AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class define it to that here])
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m4_ifnblank([$1],[$1])],
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[m4_ifnblank([$2],[$2])])
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])
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