-# Extracted from the package's shipped aclocal.m4. Custom macros should be in
+# Extracted from the package's shipped aclocal.m4. Custom macros should be in
# acinclude.m4 so running aclocal doesn't blow them away.
#
-# RP 1/6/2010
+# Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+# from http://autoconf-archive.cryp.to/ax_tls.html
+#
+# This was licensed under the GPL with the following exception:
+#
+# 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 Macro 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)
+])
# ===========================================================================
# http://www.nongnu.org/autoconf-archive/check_gnu_make.html
