re PR c/37106 (ICE with -fpic or -fPIC: in mems_in_disjoint_alias_sets_p, at alias.c:278)

	PR c/37106
	* c-common.c (parse_optimize_options): Save and restore
	flag_strict_aliasing around decode_options call.

	* gcc.dg/pr37106-1.c: New test.
	* gcc.dg/pr37106-2.c: New test.

From-SVN: r141584

gcc/ChangeLog

+2008-11-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/37106
+	* c-common.c (parse_optimize_options): Save and restore
+	flag_strict_aliasing around decode_options call.
+
 2008-11-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/driver-i386.c (enum vendor_signatures): New enum.

gcc/c-common.c

@@ -6979,6 +6979,7 @@ parse_optimize_options (tree args, bool attr_p)
   bool ret = true;
   unsigned opt_argc;
   unsigned i;
+  int saved_flag_strict_aliasing;
   const char **opt_argv;
   tree ap;
 
@@ -7069,9 +7070,14 @@ parse_optimize_options (tree args, bool attr_p)
   for (i = 1; i < opt_argc; i++)
     opt_argv[i] = VEC_index (const_char_p, optimize_args, i);
 
+  saved_flag_strict_aliasing = flag_strict_aliasing;
+
   /* Now parse the options.  */
   decode_options (opt_argc, opt_argv);
 
+  /* Don't allow changing -fstrict-aliasing.  */
+  flag_strict_aliasing = saved_flag_strict_aliasing;
+
   VEC_truncate (const_char_p, optimize_args, 0);
   return ret;
 }

gcc/testsuite/ChangeLog

+2008-11-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/37106
+	* gcc.dg/pr37106-1.c: New test.
+	* gcc.dg/pr37106-2.c: New test.
+
 2008-11-03  Chao-ying Fu  <fu@mips.com>
 
 	* gcc.target/mips/dsp-ctrl.c: New test. 

gcc/testsuite/gcc.dg/pr37106-1.c

+/* PR c/37106 */
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+/* { dg-options "-O1 -fpic" { target fpic } } */
+
+#define SIZE 256
+float a[SIZE], b[SIZE], c[SIZE];
+
+void opt3 (void) __attribute__((__optimize__(3)));
+
+void
+opt3 (void)
+{
+  int i;
+
+  for (i = 0; i < SIZE; i++)
+    a[i] = b[i] + c[i];
+}
+
+void
+not_opt3 (void)
+{
+  int i;
+
+  for (i = 0; i < SIZE; i++)
+    a[i] = b[i] - c[i];
+}

gcc/testsuite/gcc.dg/pr37106-2.c

+/* PR c/37106 */
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+/* { dg-options "-O3 -fpic" { target fpic } } */
+
+#define SIZE 256
+float a[SIZE], b[SIZE], c[SIZE];
+
+void non_opt3 (void) __attribute__((__optimize__(1)));
+
+void
+not_opt3 (void)
+{
+  int i;
+
+  for (i = 0; i < SIZE; i++)
+    a[i] = b[i] - c[i];
+}
+
+void
+opt3 (void)
+{
+  int i;
+
+  for (i = 0; i < SIZE; i++)
+    a[i] = b[i] + c[i];
+}