diagnostics: Add function call parens matching to c_parser.

The C++ parser already tracks function call parens matching, but the C
parser doesn't. This adds the same functionality to the C parser and adds
a testcase showing the C++ and C parser matching function call parens
in an error message.

gcc/c/ChangeLog:

	* c-parser.c (c_parser_postfix_expression_after_primary): Add
	scope with matching_parens after CPP_OPEN_PAREN.

gcc/testsuite/ChangeLog:

	* c-c++-common/missing-close-func-paren.c: New test.

1 files changed, 17 insertions, 15 deletions

diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c
index 5d11e7e..23d6fa2 100644
--- a/gcc/c/c-parser.c
+++ b/gcc/c/c-parser.c
@@ -10458,21 +10458,23 @@ c_parser_postfix_expression_after_primary (c_parser *parser,
 	  break;
 	case CPP_OPEN_PAREN:
 	  /* Function call.  */
-	  c_parser_consume_token (parser);
-	  for (i = 0; i < 3; i++)
-	    {
-	      sizeof_arg[i] = NULL_TREE;
-	      sizeof_arg_loc[i] = UNKNOWN_LOCATION;
-	    }
-	  literal_zero_mask = 0;
-	  if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
-	    exprlist = NULL;
-	  else
-	    exprlist = c_parser_expr_list (parser, true, false, &origtypes,
-					   sizeof_arg_loc, sizeof_arg,
-					   &arg_loc, &literal_zero_mask);
-	  c_parser_skip_until_found (parser, CPP_CLOSE_PAREN,
-				     "expected %<)%>");
+	  {
+	    matching_parens parens;
+	    parens.consume_open (parser);
+	    for (i = 0; i < 3; i++)
+	      {
+		sizeof_arg[i] = NULL_TREE;
+		sizeof_arg_loc[i] = UNKNOWN_LOCATION;
+	      }
+	    literal_zero_mask = 0;
+	    if (c_parser_next_token_is (parser, CPP_CLOSE_PAREN))
+	      exprlist = NULL;
+	    else
+	      exprlist = c_parser_expr_list (parser, true, false, &origtypes,
+					     sizeof_arg_loc, sizeof_arg,
+					     &arg_loc, &literal_zero_mask);
+	    parens.skip_until_found_close (parser);
+	  }
 	  orig_expr = expr;
 	  mark_exp_read (expr.value);
 	  if (warn_sizeof_pointer_memaccess)