[C++ PATCH] Fix ICE on invalid (PR c++/78341)

[Jason Merrill]

OK.

On Tue, Jan 10, 2017 at 5:35 PM, Jakub Jelinek <jakub@redhat.com> wrote:
> Hi!
>
> As mentioned in the PR, cp_parser_parse_definitely may fail even when
> alignas_expr actually is meaningful, e.g. when the error is due to the
> missing closing paren.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
>
> 2017-01-10  Jakub Jelinek  <jakub@redhat.com>
>
>         PR c++/78341
>         * parser.c (cp_parser_std_attribute_spec): Remove over-eager
>         assertion.  Formatting fix.
>
>         * g++.dg/cpp0x/pr78341.C: New test.
>
> --- gcc/cp/parser.c.jj  2017-01-10 08:12:46.000000000 +0100
> +++ gcc/cp/parser.c     2017-01-10 11:09:04.217456830 +0100
> @@ -24931,11 +24931,7 @@ cp_parser_std_attribute_spec (cp_parser
>
>        if (!cp_parser_parse_definitely (parser))
>         {
> -         gcc_assert (alignas_expr == error_mark_node
> -                     || alignas_expr == NULL_TREE);
> -
> -         alignas_expr =
> -           cp_parser_assignment_expression (parser);
> +         alignas_expr = cp_parser_assignment_expression (parser);
>           if (alignas_expr == error_mark_node)
>             cp_parser_skip_to_end_of_statement (parser);
>           if (alignas_expr == NULL_TREE
> --- gcc/testsuite/g++.dg/cpp0x/pr78341.C.jj     2017-01-10 11:11:10.368843803 +0100
> +++ gcc/testsuite/g++.dg/cpp0x/pr78341.C        2017-01-10 11:10:52.000000000 +0100
> @@ -0,0 +1,4 @@
> +// PR c++/78341
> +// { dg-do compile { target c++11 } }
> +
> +alignas (alignas double // { dg-error "" }
>
>         Jakub