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+# SPDX-License-Identifier: GPL-3.0-or-later WITH Autoconf-exception-3.0
+#
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_tls.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_TLS([action-if-found], [action-if-not-found])
+#
+# DESCRIPTION
+#
+# Provides a test for the compiler support of thread local storage (TLS)
+# extensions. Defines TLS if it is found. Currently knows about C++11,
+# GCC/ICC, and MSVC. I think SunPro uses the same as GCC, and Borland
+# apparently supports either.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk>
+# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 15
+
+AC_DEFUN([AX_TLS], [
+ AC_MSG_CHECKING([for thread local storage (TLS) class])
+ AC_CACHE_VAL([ac_cv_tls],
+ [for ax_tls_keyword in thread_local _Thread_local __thread '__declspec(thread)' none; do
+ AS_CASE([$ax_tls_keyword],
+ [none], [ac_cv_tls=none ; break],
+ [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+ [#include <stdlib.h>],
+ [static $ax_tls_keyword int bar;]
+ )],
+ [ac_cv_tls=$ax_tls_keyword ; break],
+ [ac_cv_tls=none]
+ )]
+ )
+ done ]
+ )
+ AC_MSG_RESULT([$ac_cv_tls])
+
+ AS_IF([test "$ac_cv_tls" != "none"],
+ [AC_DEFINE_UNQUOTED([TLS],[$ac_cv_tls],[If the compiler supports a TLS storage class, define it to that here])
+ m4_ifnblank([$1],[$1],[[:]])],
+ [m4_ifnblank([$2],[$2],[[:]])])
+])