re PR lto/61868 (-frandom-seed always results in random_seed of 0)

2014-07-31  Bingfeng Mei <bmei@broadcom.com>

	PR lto/61868
	* toplev.c (init_random_seed): Move piece of code never called to
	set_random_seed.
	(set_random_seed): see above.
	
	* gcc.dg/pr61868.c: New test.

From-SVN: r213321

gcc/ChangeLog

+2014-07-31  Bingfeng Mei <bmei@broadcom.com>
+
+	PR lto/61868
+	* toplev.c (init_random_seed): Move piece of code never called to
+	set_random_seed.
+	(set_random_seed): see above.
+
 2014-07-31  Tom de Vries  <tom@codesourcery.com>
 
 	* tree-ssa-loop.c (pass_tree_loop_init::execute): Remove dead code.

gcc/testsuite/ChangeLog

+2014-07-31  Bingfeng Mei  <bmei@broadcom.com>
+
+	PR lto/61868
+	* gcc.dg/pr61868.c: New test.
+
 2014-07-30  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/57397

gcc/testsuite/gcc.dg/pr61868.c

+/* { dg-do compile } */
+/* { dg-options "-flto -frandom-seed=0x12345" }  */
+extern int foo (int);
+int main ()
+{
+  foo (100);
+  return 0;
+}
+/* { dg-final { scan-assembler "\.gnu\.lto.*.12345" } } */

gcc/toplev.c

@@ -282,16 +282,7 @@ init_local_tick (void)
 static void
 init_random_seed (void)
 {
-  if (flag_random_seed)
-    {
-      char *endp;
-
-      /* When the driver passed in a hex number don't crc it again */
-      random_seed = strtoul (flag_random_seed, &endp, 0);
-      if (!(endp > flag_random_seed && *endp == 0))
-        random_seed = crc32_string (0, flag_random_seed);
-    }
-  else if (!random_seed)
+  if (!random_seed)
     random_seed = local_tick ^ getpid ();  /* Old racey fallback method */
 }
 
@@ -314,6 +305,15 @@ set_random_seed (const char *val)
 {
   const char *old = flag_random_seed;
   flag_random_seed = val;
+  if (flag_random_seed)
+    {
+      char *endp;
+
+      /* When the driver passed in a hex number don't crc it again */
+      random_seed = strtoul (flag_random_seed, &endp, 0);
+      if (!(endp > flag_random_seed && *endp == 0))
+        random_seed = crc32_string (0, flag_random_seed);
+    }
   return old;
 }