re PR c++/87175 (__attribute__)) is ignored by the parser)

	PR c++/87175
	* parser.c (cp_parser_gnu_attributes_opt): Set ok to false
	if require_open failed.

	* g++.dg/ext/attrib57.C: New test.

From-SVN: r268443

gcc/cp/ChangeLog

+2019-02-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/87175
+	* parser.c (cp_parser_gnu_attributes_opt): Set ok to false
+	if require_open failed.
+
 2019-01-31  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/89083, c++/80864 - ICE with list initialization in template.

gcc/cp/parser.c

@@ -25768,9 +25768,11 @@ cp_parser_gnu_attributes_opt (cp_parser* parser)
       cp_lexer_consume_token (parser->lexer);
       /* Look for the two `(' tokens.  */
       matching_parens outer_parens;
-      outer_parens.require_open (parser);
+      if (!outer_parens.require_open (parser))
+	ok = false;
       matching_parens inner_parens;
-      inner_parens.require_open (parser);
+      if (!inner_parens.require_open (parser))
+	ok = false;
 
       /* Peek at the next token.  */
       token = cp_lexer_peek_token (parser->lexer);

gcc/testsuite/ChangeLog

+2019-02-01  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/87175
+	* g++.dg/ext/attrib57.C: New test.
+
 2018-02-01  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/88932

gcc/testsuite/g++.dg/ext/attrib57.C

+// PR c++/87175
+// { dg-do compile }
+// { dg-options "" }
+
+struct __attribute__)) foo { };	// { dg-error "expected" }
+struct __attribute__()) bar { };// { dg-error "expected" }