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

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

[gscfq@t-online.de]

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

            Bug ID: 104668
           Summary: [12 Regression] ICE in lookup_attribute_spec, at
                    attribs.cc:425
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Started between 20220123 and 20220130 :
(derived from g++.dg/cpp0x/lambda/lambda-variadic15.C)


$ cat z1.cc
template <class... Ts>
void sink(Ts...);
template <class... Ts>
void f(Ts...) {
  sink([] { struct alignas:Ts) S {}; }...); }
}
int main() {
  f(0);
}


$ g++-12-20220220 -c z1.cc
z1.cc: In lambda function:
z1.cc:5:20: internal compiler error: Segmentation fault
    5 |   sink([] { struct alignas:Ts) S {}; }...); }
      |                    ^~~~~~~
0xda25ef crash_signal
        ../../gcc/toplev.cc:322
0x89f4f1 lookup_attribute_spec(tree_node const*)
        ../../gcc/attribs.cc:425
0x75217e is_late_template_attribute
        ../../gcc/cp/decl2.cc:1243
0x75217e splice_template_attributes(tree_node**, tree_node*)
        ../../gcc/cp/decl2.cc:1340
0x752b1e cplus_decl_attributes(tree_node**, tree_node*, int)
        ../../gcc/cp/decl2.cc:1662
0x7eabc8 cp_parser_class_head
        ../../gcc/cp/parser.cc:26646
0x7eabc8 cp_parser_class_specifier_1
        ../../gcc/cp/parser.cc:25824
0x7eb670 cp_parser_class_specifier
        ../../gcc/cp/parser.cc:26204
0x7eb670 cp_parser_type_specifier
        ../../gcc/cp/parser.cc:19348
0x7ec1a6 cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.cc:15911
0x7ecd61 cp_parser_simple_declaration
        ../../gcc/cp/parser.cc:15159
0x7ee769 cp_parser_declaration_statement
        ../../gcc/cp/parser.cc:14367
0x7eed6b cp_parser_statement
        ../../gcc/cp/parser.cc:12452
0x7efcb4 cp_parser_statement_seq_opt
        ../../gcc/cp/parser.cc:12856
0x7efd6f cp_parser_compound_statement
        ../../gcc/cp/parser.cc:12808
0x7f0778 cp_parser_function_body
        ../../gcc/cp/parser.cc:25062
0x7f0778 cp_parser_lambda_body
        ../../gcc/cp/parser.cc:11799
0x7f0778 cp_parser_lambda_expression
        ../../gcc/cp/parser.cc:11118
0x7f0778 cp_parser_primary_expression
        ../../gcc/cp/parser.cc:5700
0x7f3725 cp_parser_postfix_expression
        ../../gcc/cp/parser.cc:7652

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

[mpolacek at gcc dot gnu.org]

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

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |mpolacek at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Target Milestone|---                         |12.0
           Priority|P3                          |P2
   Last reconfirmed|                            |2022-02-23

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r12-6904.

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

[marxin at gcc dot gnu.org]

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

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #1)
> Started with r12-6904.

Please update to the latest version of git gcc-descr alias (that append git
hash by default). Thanks.

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

[cvs-commit at gcc dot 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.

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

[jakub at gcc dot gnu.org]

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

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.