Fix "#pragma GCC pop_options"

gcc/ChangeLog

	* targhooks.c (default_target_option_pragma_parse): Do not warn if
	called on behalf of "#pragma GCC pop_options".

gcc/testsuite/ChangeLog

	* gcc.dg/pragma-pop_options-1.c: New test.

From-SVN: r228794

gcc/ChangeLog

+2015-10-14  Dominik Vogt  <vogt@linux.vnet.ibm.com>
+
+	* targhooks.c (default_target_option_pragma_parse): Do not warn if
+	called on behalf of "#pragma GCC pop_options".
+
 2015-10-14  Tom de Vries  <tom@codesourcery.com>
 
 	* cfganal.c (verify_no_unreachable_blocks): New function.

gcc/targhooks.c

@@ -1305,6 +1305,10 @@ bool
 default_target_option_pragma_parse (tree ARG_UNUSED (args),
 				    tree ARG_UNUSED (pop_target))
 {
+  /* If args is NULL the caller is handle_pragma_pop_options ().  In that case,
+     emit no warning because "#pragma GCC pop_target" is valid on targets that
+     do not have the "target" pragma.  */
+  if (args)
     warning (OPT_Wpragmas,
 	     "#pragma GCC target is not supported for this machine");
 

gcc/testsuite/ChangeLog

+2015-10-14  Dominik Vogt  <vogt@linux.vnet.ibm.com>
+
+	* gcc.dg/pragma-pop_options-1.c: New test.
+
 2015-10-13  Jakub Jelinek  <jakub@redhat.com>
 	    Aldy Hernandez  <aldyh@redhat.com>
 

gcc/testsuite/gcc.dg/pragma-pop_options-1.c

+/* Check warnings produced by #pragma GCC push/pop/reset_options.  */
+/* { dg-do assemble } */
+
+#pragma push_options
+#pragma pop_options
+
+int foo;