re PR bootstrap/37086 (GCC 3.4 miscompiles trunk (for cross compiling))

	PR bootstrap/37086
	* tree-vrp.c (find_switch_asserts): Make idx volatile for GCC
	versions before 4.0.

From-SVN: r139792

gcc/ChangeLog

+2008-08-29  Joseph Myers  <joseph@codesourcery.com>
+
+	PR bootstrap/37086
+	* tree-vrp.c (find_switch_asserts): Make idx volatile for GCC
+	versions before 4.0.
+
 2008-08-29  Jan Hubicka  <jh@suse.cz>
 
 	* tree-inline.c (insert_init_stmt): Insert sequence even when

gcc/tree-vrp.c

@@ -4333,7 +4333,12 @@ find_switch_asserts (basic_block bb, gimple last)
   edge e;
   tree vec2;
   size_t n = gimple_switch_num_labels(last);
+#if GCC_VERSION >= 4000
   unsigned int idx;
+#else
+  /* Work around GCC 3.4 bug (PR 37086).  */
+  volatile unsigned int idx;
+#endif
 
   need_assert = false;
   bsi = gsi_for_stmt (last);