akr	2013-02-08 21:20:27 +0900 (Fri, 08 Feb 2013)

  New Revision: 39160

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=39160

  Log:
    * configure.in: don't define ARCH_FLAG="-march=i486" if it causes
      compilation problem.

  Modified files:
    trunk/ChangeLog
    trunk/configure.in

Index: configure.in
===================================================================
--- configure.in	(revision 39159)
+++ configure.in	(revision 39160)
@@ -1553,7 +1553,15 @@ AS_CASE(["$target_cpu-$target_os"], [[i[ https://github.com/ruby/ruby/blob/trunk/configure.in#L1553
 				      [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
 		 ARCH_FLAG="-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],
+					      [rb_cv_gcc_compiler_cas=no; unset ARCH_FLAG])])
 	 fi])
 
 AC_CACHE_CHECK(for signbit, rb_cv_have_signbit,
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 39159)
+++ ChangeLog	(revision 39160)
@@ -1,3 +1,8 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Fri Feb  8 21:19:41 2013  Tanaka Akira  <akr@f...>
+
+	* configure.in: don't define ARCH_FLAG="-march=i486" if it causes
+	  compilation problem.
+
 Fri Feb  8 19:56:54 2013  NAKAMURA Usaku  <usa@r...>
 
 	* array.c (rb_ary_dup): reverted r39004.  see [Bug #7768], and

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