PR c/69507 - bogus warning: ISO C does not allow ‘__alignof__ (expression)’

gcc/testsuite/ChangeLog:

	PR c/69507
	* gcc.dg/alignof.c: New test.

gcc/c/ChangeLog:

	PR c/69507
	* c-parser.c (c_parser_alignof_expression): Avoid diagnosing
	__alignof__ (expression).

From-SVN: r237581

gcc/c/ChangeLog

+2016-06-19 Martin Sebor  <msebor@redhat.com>
+
+	PR c/69507
+	* c-parser.c (c_parser_alignof_expression): Avoid diagnosing
+	__alignof__ (expression).
+
 2016-06-14  David Malcolm  <dmalcolm@redhat.com>
 
 	* c-typeck.c: Include spellcheck-tree.h rather than spellcheck.h.

gcc/c/c-parser.c

@@ -7091,9 +7091,10 @@ c_parser_alignof_expression (c_parser *parser)
       mark_exp_read (expr.value);
       c_inhibit_evaluation_warnings--;
       in_alignof--;
-      pedwarn (start_loc,
-	       OPT_Wpedantic, "ISO C does not allow %<%E (expression)%>",
-	       alignof_spelling);
+      if (is_c11_alignof)
+	pedwarn (start_loc,
+		 OPT_Wpedantic, "ISO C does not allow %<%E (expression)%>",
+		 alignof_spelling);
       ret.value = c_alignof_expr (start_loc, expr.value);
       ret.original_code = ERROR_MARK;
       ret.original_type = NULL;

gcc/testsuite/ChangeLog

+2016-06-19 Martin Sebor  <msebor@redhat.com>
+
+	PR c/69507
+	* gcc.dg/alignof.c: New test.
+
 2016-06-17  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* g++.dg/cpp0x/constexpr-specialization.C: Adjust for dg-message