[Bug c++/98297] New: [9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[Bug c++/98297] New: [9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

            Bug ID: 98297
           Summary: [9/10/11 Regression] ICE in
                    cp_parser_elaborated_type_specifier, at
                    cp/parser.c:19653
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Affects versions down to r8 :


$ cat z1.cc
template <template <class> class a> struct [[b]] a <int>;


$ g++-11-20201213 -c z1.cc
z1.cc:1:50: internal compiler error: Segmentation fault
    1 | template <template <class> class a> struct [[b]] a <int>;
      |                                                  ^~~~~~~
0xc8f5ff crash_signal
        ../../gcc/toplev.c:327
0x7507a5 cp_parser_elaborated_type_specifier
        ../../gcc/cp/parser.c:19653
0x739283 cp_parser_type_specifier
        ../../gcc/cp/parser.c:18393
0x73a0b6 cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.c:14990
0x75bd05 cp_parser_single_declaration
        ../../gcc/cp/parser.c:30321
0x75c095 cp_parser_template_declaration_after_parameters
        ../../gcc/cp/parser.c:29984
0x75c84b cp_parser_explicit_template_declaration
        ../../gcc/cp/parser.c:30250
0x75c84b cp_parser_template_declaration_after_export
        ../../gcc/cp/parser.c:30269
0x75ecf9 cp_parser_declaration
        ../../gcc/cp/parser.c:13996
0x75e183 cp_parser_translation_unit
        ../../gcc/cp/parser.c:4926
0x75e183 c_parse_file()
        ../../gcc/cp/parser.c:45106
0x82acf2 c_common_parse_file()
        ../../gcc/c-family/c-opts.c:1211

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |mpolacek at gcc dot gnu.org
   Last reconfirmed|                            |2020-12-15
            Summary|[9/10/11 Regression] ICE in |[8/9/10/11 Regression] ICE
                   |cp_parser_elaborated_type_s |in
                   |pecifier, at                |cp_parser_elaborated_type_s
                   |cp/parser.c:19653           |pecifier, at
                   |                            |cp/parser.c:19653
   Target Milestone|---                         |8.5

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

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

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

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Likely started with r8-2567-g776ff3efa9de7fce.

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |nathan at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed trunk, 8d8bb85b486 2020-12-16 | c++: Fix template parm ICE [PR 98297]

backports to 10, 9, & 8 in progress

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
8, 9 & 10 fixed

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

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

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

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note, the testcase FAILs on the 8 branch, the emitted error is different.
$ gcc-9/obj28/gcc/cc1plus -quiet -std=c++11 /tmp/pr98297.C -o /tmp/pr98297.s
/tmp/pr98297.C:5:1: warning: ‘b’ attribute directive ignored [-Wattributes]
    5 | a <int>; // { dg-error "does not declare anything" }
      | ^~~~~~~
/tmp/pr98297.C:5:1: error: declaration does not declare anything [-fpermissive]
$ gcc-8/obj32/gcc/cc1plus -quiet -std=c++11 /tmp/pr98297.C -o /tmp/pr98297.s
/tmp/pr98297.C:5:1: warning: ‘b’ attribute directive ignored [-Wattributes]
 a <int>; // { dg-error "does not declare anything" }
 ^~~~~~~
/tmp/pr98297.C:5:1: error: name of class shadows template template parameter
‘a’
$ gcc-8/obj30/gcc/cc1plus -quiet -std=c++11 /tmp/pr98297.C -o /tmp/pr98297.s
/tmp/pr98297.C:5:1: internal compiler error: Segmentation fault
 a <int>; // { dg-error "does not declare anything" }
 ^~~~~~~
gcc-8/obj30 is 5 months old snapshot which expectedly ICEs, but the middle
error is different from what the test expects.

[Bug c++/98297] [8/9/10/11 Regression] ICE in cp_parser_elaborated_type_specifier, at cp/parser.c:19653

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98297

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, tracked already in PR98358.