[Bug c++/101881] New: [9/10/11/12 Regression] ICE with vector type in template alias

[Bug c++/101881] New: [9/10/11/12 Regression] ICE with vector type in template alias

[reichelt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

            Bug ID: 101881
           Summary: [9/10/11/12 Regression] ICE with vector type in
                    template alias
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org
  Target Milestone: ---

The following valid code snippet triggers an ICE since GCC 7.1.0:

=================================================================
template<int N> using A = int __attribute__((vector_size(N)))*; 

void foo(A<4>) {}
=================================================================

bug.cc:3:6: internal compiler error: in add_substitution, at cp/mangle.c:462
 void foo(A<4>) {}
      ^~~
0x8014a5 add_substitution
        ../../gcc-7.5.0/gcc/cp/mangle.c:461
0x7fa97b write_type
        ../../gcc-7.5.0/gcc/cp/mangle.c:2413
0x7fd114 write_method_parms
        ../../gcc-7.5.0/gcc/cp/mangle.c:2828
0x7fd3f6 write_bare_function_type
        ../../gcc-7.5.0/gcc/cp/mangle.c:2764
0x80505c mangle_decl_string
        ../../gcc-7.5.0/gcc/cp/mangle.c:3821
0x8053c3 get_mangled_id
        ../../gcc-7.5.0/gcc/cp/mangle.c:3843
0x8053c3 mangle_decl(tree_node*)
        ../../gcc-7.5.0/gcc/cp/mangle.c:3913
0x102833e decl_assembler_name(tree_node*)
        ../../gcc-7.5.0/gcc/tree.c:671
0x1077ac7 notice_global_symbol(tree_node*)
        ../../gcc-7.5.0/gcc/varasm.c:1656
0x96fdd9 cgraph_node::finalize_function(tree_node*, bool)
        ../../gcc-7.5.0/gcc/cgraphunit.c:442
0x7b5e9f expand_or_defer_fn(tree_node*)
        ../../gcc-7.5.0/gcc/cp/semantics.c:4321
0x74a3a9 cp_parser_function_definition_after_declarator
        ../../gcc-7.5.0/gcc/cp/parser.c:26468
0x74b07e cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc-7.5.0/gcc/cp/parser.c:26371
0x74b07e cp_parser_init_declarator
        ../../gcc-7.5.0/gcc/cp/parser.c:19353
0x745e3c cp_parser_simple_declaration
        ../../gcc-7.5.0/gcc/cp/parser.c:12886
0x746d77 cp_parser_block_declaration
        ../../gcc-7.5.0/gcc/cp/parser.c:12711
0x7511e4 cp_parser_declaration
        ../../gcc-7.5.0/gcc/cp/parser.c:12609
0x75161b cp_parser_declaration_seq_opt
        ../../gcc-7.5.0/gcc/cp/parser.c:12485
0x751902 cp_parser_translation_unit
        ../../gcc-7.5.0/gcc/cp/parser.c:4368
0x751902 c_parse_file()
        ../../gcc-7.5.0/gcc/cp/parser.c:38643
Please submit a full bug report, [etc.]

This is related to PR 83997, but without -flto. And we have a regression.

[Bug c++/101881] [9/10/11/12 Regression] ICE with vector type in template alias since r7-2549-gf3365c1201908df5

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[9/10/11/12 Regression] ICE |[9/10/11/12 Regression] ICE
                   |with vector type in         |with vector type in
                   |template alias              |template alias since
                   |                            |r7-2549-gf3365c1201908df5
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-08-12
     Ever confirmed|0                           |1

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r7-2549-gf3365c1201908df5.

[Bug c++/101881] [9/10/11/12 Regression] ICE with vector type in template alias since r7-2549-gf3365c1201908df5

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.5

[Bug c++/101881] [9/10/11/12 Regression] ICE with vector type in template alias since r7-2549-gf3365c1201908df5

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug c++/101881] [10/11/12/13 Regression] ICE with vector type in template alias since r7-2549-gf3365c1201908df5

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |10.4

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9 branch is being closed

[Bug c++/101881] [10/11/12/13 Regression] ICE with vector type in template alias since r7-2549-gf3365c1201908df5

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.4                        |10.5

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.

[Bug c++/101881] [11/12/13/14 Regression] ICE with vector type in template alias since r7-2549-gf3365c1201908df5

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101881

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.5                        |11.5

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.