--- /dev/null
+# ===========================================================================
+# http://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 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 <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.
+
+#serial 10
+
+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 $ax_tls_keywords; do
+ AS_CASE([$ax_tls_keyword],
+ [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
+ )])
+ 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])
+ )
+])
AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+m4_include([config/ax_tls.m4])
+
AC_CONFIG_SRCDIR([urcu.h])
AC_CONFIG_HEADERS([config.h urcu/config.h])
AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
+AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
+
+AX_TLS([AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $ac_cv_tls)], [])
# Checks for programs.
AC_PROG_CC
projects / userspace-rcu.git / commitdiff
