* configure.in (ARCH_FLAG): __sync_val_compare_and_swap_4 needs

  -march=i486 on at least linux gcc 4.1.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@44953 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: unak

ChangeLog

@@ -1,3 +1,8 @@
+Fri Feb 14 20:52:31 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* configure.in (ARCH_FLAG): __sync_val_compare_and_swap_4 needs
+	  -march=i486 on at least linux gcc 4.1.
+
 Fri Feb 14 19:07:13 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ruby_atomic.h (ATOMIC_PTR_EXCHANGE): atomic exchange function for

configure.in

@@ -308,6 +308,29 @@ if test "$target_cpu" != "$host_cpu" -a "$GCC" = yes -a "$cross_compiling" = no
     RUBY_DEFAULT_ARCH("$target_cpu")
 fi
 
+AS_CASE(["$target_cpu-$target_os"], [[i[3-6]86*]], [
+	 AC_CACHE_CHECK([for __sync_val_compare_and_swap], [rb_cv_gcc_compiler_cas], [
+			 AC_TRY_LINK([unsigned long atomic_var;],
+				     [
+				      __sync_val_compare_and_swap(&atomic_var, 0, 1);
+				      ],
+				      [rb_cv_gcc_compiler_cas=yes],
+				      [rb_cv_gcc_compiler_cas=no])])
+	 if test "$rb_cv_gcc_compiler_cas" = no; then
+		 unset rb_cv_gcc_compiler_cas
+		 save_CFLAGS="$CFLAGS"
+		 CFLAGS="$CFLAGS -march=i486"
+		 AC_CACHE_CHECK([for __sync_val_compare_and_swap with -march=i486], [rb_cv_gcc_compiler_cas], [
+				 AC_TRY_LINK([unsigned long atomic_var;],
+					     [
+					      __sync_val_compare_and_swap(&atomic_var, 0, 1);
+					      ],
+					      [rb_cv_gcc_compiler_cas=yes
+					       ARCH_FLAG="-march=i486"],
+					      [rb_cv_gcc_compiler_cas=no])])
+		 CFLAGS="$save_CFLAGS"
+	 fi])
+
 AC_CHECK_TOOL(RANLIB, ranlib, :)
 AC_CHECK_TOOL(AR, ar)
 if test -z "$AR"; then

version.h

@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.3"
-#define RUBY_PATCHLEVEL 532
+#define RUBY_PATCHLEVEL 533
 
 #define RUBY_RELEASE_DATE "2014-02-14"
 #define RUBY_RELEASE_YEAR 2014