X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=config%2Fax_tls.m4;h=7c86daf147cdc8f068161f2dc128bbfd7ef2ebc2;hp=033e3b135b8d6264e0b3151c3528ae7b3a74c6ca;hb=84f4ccb4bcf32c0336a0c7a3a4ba76d90d6dea1b;hpb=a767fdc348289dc37026ee3ab46d1d4102ff57f7

diff --git a/config/ax_tls.m4 b/config/ax_tls.m4
index 033e3b1..7c86daf 100644
--- a/config/ax_tls.m4
+++ b/config/ax_tls.m4
@@ -44,7 +44,23 @@
 #   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
+#serial 11
+
+#   Define m4_ifblank and m4_ifnblank macros from introduced in
+#   autotools 2.64 m4sugar.m4 if using an earlier autotools.
+
+ifdef([m4_ifblank], [], [
+m4_define([m4_ifblank],
+[m4_if(m4_translit([[$1]],  [ ][	][
+]), [], [$2], [$3])])
+])
+
+
+ifdef([m4_ifnblank], [], [
+m4_define([m4_ifnblank],
+[m4_if(m4_translit([[$1]],  [ ][	][
+]), [], [$3], [$2])])
+])
 
 AC_DEFUN([AX_TLS], [
   AC_MSG_CHECKING(for thread local storage (TLS) class)
@@ -53,16 +69,11 @@ AC_DEFUN([AX_TLS], [
     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 ] $ax_tls_keyword [ int bar;
-               exit(1);
-               }],
-               [],
+          [AC_TRY_LINK(
+               [$ax_tls_keyword int foo;],
+               [++foo;],
                [ac_cv_tls=$ax_tls_keyword ; break],
-               ac_cv_tls=none
+               [ac_cv_tls=none]
            )])
     done
   ])