re PR lto/56297 (LTO: multiple definition error with global register variables)

2013-02-12  Richard Biener  <rguenther@suse.de>

	PR lto/56297
	* lto-streamer-out.c (write_symbol): Do not output symbols
	for hard register variables.

	* gcc.dg/lto/pr56297_0.c: New testcase.
	* gcc.dg/lto/pr56297_0.c: Likewise.

From-SVN: r195979

gcc/ChangeLog

+2013-02-12  Richard Biener  <rguenther@suse.de>
+
+	PR lto/56297
+	* lto-streamer-out.c (write_symbol): Do not output symbols
+	for hard register variables.
+
 2013-02-12  Georg-Johann Lay  <avr@gjlay.de>
 
 	PR target/54222

gcc/lto-streamer-out.c

@@ -1166,7 +1166,8 @@ write_symbol (struct streamer_tree_cache_d *cache,
   if (!TREE_PUBLIC (t)
       || is_builtin_fn (t)
       || DECL_ABSTRACT (t)
-      || TREE_CODE (t) == RESULT_DECL)
+      || TREE_CODE (t) == RESULT_DECL
+      || (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t)))
     return;
 
   gcc_assert (TREE_CODE (t) == VAR_DECL

gcc/testsuite/ChangeLog

+2013-02-12  Richard Biener  <rguenther@suse.de>
+
+	PR lto/56297
+	* gcc.dg/lto/pr56297_0.c: New testcase.
+	* gcc.dg/lto/pr56297_0.c: Likewise.
+
 2013-02-12  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/46952

gcc/testsuite/gcc.dg/lto/pr56297_0.c

+/* { dg-lto-do link } */
+/* { dg-lto-options { { -flto -fno-common } } } */
+
+#if __x86_64__ || __i386__
+register int i asm("esp");
+#else
+extern int i;
+#endif
+
+int main(void)
+{
+  return i;
+}

gcc/testsuite/gcc.dg/lto/pr56297_1.c

+#if __x86_64__ || __i386__
+register int i asm("esp");
+#else
+int i;
+#endif