[Bug c++/104668] [12 Regression] ICE in lookup_attribute_spec, at attribs.cc:425

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104668

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:9fd377a747375a82912bd81c67b275301489785c

commit r12-8029-g9fd377a747375a82912bd81c67b275301489785c
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Apr 6 17:53:41 2022 +0200

    c++: Fix up ICE when cplus_decl_attributes is called with error_mark_node
attributes [PR104668]

    cplus_decl_attributes can be called with attributes equal to
    error_mark_node, there are some spots in the function that test
    it or decl_attributes it calls starts with:
      if (TREE_TYPE (*node) == error_mark_node || attributes ==
error_mark_node)
        return NULL_TREE;
    But the recent PR104245 change broke this when processing_template_decl
    is true.

    The patch returns early for attributes error_mark_node from
    cplus_decl_attributes.

    2022-04-06  Jakub Jelinek  <jakub@redhat.com>

            PR c++/104668
            * decl2.cc (splice_template_attributes): Return NULL if *p is
            error_mark_node.
            (cplus_decl_attributes): Return early if attributes is
            error_mark_node.  Don't check that later.

            * g++.dg/cpp0x/pr104668.C: New test.