re PR c/67432 (Improve error message on empty enum)

	PR c/67432
	* c-parser.c (c_parser_enum_specifier): Give a better error for
	an empty enum.

	* gcc.dg/pr67432.c: New test.

From-SVN: r227421

gcc/c/ChangeLog

+2015-09-02  Marek Polacek  <polacek@redhat.com>
+
+	PR c/67432
+	* c-parser.c (c_parser_enum_specifier): Give a better error for
+	an empty enum.
+
 2015-08-18  Trevor Saunders  <tbsaunde@tbsaunde.org>
 
 	* c-aux-info.c, c-parser.c, c-tree.h: Remove useless typedefs.

gcc/c/c-parser.c

@@ -2555,7 +2555,16 @@ c_parser_enum_specifier (c_parser *parser)
 	  location_t decl_loc, value_loc;
 	  if (c_parser_next_token_is_not (parser, CPP_NAME))
 	    {
-	      c_parser_error (parser, "expected identifier");
+	      /* Give a nicer error for "enum {}".  */
+	      if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE)
+		  && !parser->error)
+		{
+		  error_at (c_parser_peek_token (parser)->location,
+			    "empty enum is invalid");
+		  parser->error = true;
+		}
+	      else
+		c_parser_error (parser, "expected identifier");
 	      c_parser_skip_until_found (parser, CPP_CLOSE_BRACE, NULL);
 	      values = error_mark_node;
 	      break;

gcc/testsuite/ChangeLog

+2015-09-02  Marek Polacek  <polacek@redhat.com>
+
+	PR c/67432
+	* gcc.dg/pr67432.c: New test.
+
 2015-09-02  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* lib/target-supports.exp (clear_effective_target_cache): New.

gcc/testsuite/gcc.dg/pr67432.c

+/* PR c/67432 */
+/* { dg-do compile } */
+
+enum {}; /* { dg-error "empty enum is invalid" } */
+enum E {}; /* { dg-error "empty enum is invalid" } */
+enum F {} e; /* { dg-error "empty enum is invalid" } */