# =========================================================================== # http://www.nongnu.org/autoconf-archive/ax_tls.html # =========================================================================== # # SYNOPSIS # # AX_TLS # # DESCRIPTION # # Provides a test for the compiler support of thread local storage (TLS) # extensions. Defines TLS if it is found. Currently only knows about GCC # 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> # # 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 <http://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. AC_DEFUN([AX_TLS], [ AC_MSG_CHECKING(for thread local storage (TLS) class) AC_CACHE_VAL(ac_cv_tls, [ ax_tls_keywords="__thread __declspec(thread) none" for ax_tls_keyword in $ax_tls_keywords; do case $ax_tls_keyword in none) ac_cv_tls=none ; break ;; *) AC_TRY_COMPILE( [#include <stdlib.h> static void foo(void) { static ] $ax_tls_keyword [ int bar; exit(1); }], [], [ac_cv_tls=$ax_tls_keyword ; break], ac_cv_tls=none ) esac done ]) if test "$ac_cv_tls" != "none"; then dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here]) AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here]) fi AC_MSG_RESULT($ac_cv_tls) ])