[Bug c++/100853] New: internal compiler error: in cp_tree_equal, at cp/tree.c:4148

[Bug c++/100853] New: internal compiler error: in cp_tree_equal, at cp/tree.c:4148

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

            Bug ID: 100853
           Summary: internal compiler error: in cp_tree_equal, at
                    cp/tree.c:4148
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: iii at linux dot ibm.com
  Target Milestone: ---

$ cat cp-tree-equal.cpp 
typedef struct a *b;
template <typename> struct c
{          d({
    b *e;                 __typeof (*({
      __typeof *e f;
      f}                )).g const f (({              __typeof (*({
        int h;
        f}             )).g const f (

$ gcc/cc1plus -fno-PIE -g -O2 -fno-checking -gtoggle -DIN_GCC    
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables cp-tree-equal.cpp
...
cp-tree-equal.cpp:8:37: internal compiler error: in cp_tree_equal, at
cp/tree.c:4148
    8 |         f}             )).g const f (
      |                                     ^
0x7062e9 cp_tree_equal(tree_node*, tree_node*)
        ../../gcc/cp/tree.c:4148
0xbd1d3e cp_tree_equal(tree_node*, tree_node*)
        ../../gcc/cp/tree.c:4138
0xbd1d3e cp_tree_equal(tree_node*, tree_node*)
        ../../gcc/cp/tree.c:4138
0xbd1d3e cp_tree_equal(tree_node*, tree_node*)
        ../../gcc/cp/tree.c:4138
0xbd1d3e cp_tree_equal(tree_node*, tree_node*)
        ../../gcc/cp/tree.c:4138
0xbdc784 structural_comptypes
        ../../gcc/cp/typeck.c:1491
0xae2ffc check_local_shadow
        ../../gcc/cp/name-lookup.c:3264
0xae2ffc do_pushdecl
        ../../gcc/cp/name-lookup.c:3773
0xae39b4 pushdecl(tree_node*, bool)
        ../../gcc/cp/name-lookup.c:3852
0xa3995e start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ../../gcc/cp/decl.c:5591
0xb2dd61 cp_parser_init_declarator
        ../../gcc/cp/parser.c:21802
0xb093cd cp_parser_simple_declaration
        ../../gcc/cp/parser.c:14487
0xb0b0a9 cp_parser_declaration_statement
        ../../gcc/cp/parser.c:13622
0xb0bc0b cp_parser_statement
        ../../gcc/cp/parser.c:11848
0xb0ce0e cp_parser_statement_seq_opt
        ../../gcc/cp/parser.c:12215
0xb0cee8 cp_parser_compound_statement
        ../../gcc/cp/parser.c:12164
0xb10473 cp_parser_statement_expr
        ../../gcc/cp/parser.c:5142
0xb10473 cp_parser_primary_expression
        ../../gcc/cp/parser.c:5549
0xb11b80 cp_parser_postfix_expression
        ../../gcc/cp/parser.c:7528
0xb243af cp_parser_unary_expression
        ../../gcc/cp/parser.c:8849

Found when reducing a testcase for another problem.

[Bug c++/100853] internal compiler error: in cp_tree_equal, at cp/tree.c:4148

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

--- Comment #1 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
Created attachment 50903
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50903&action=edit
repro

[Bug c++/100853] [11/12 Regression] internal compiler error: in cp_tree_equal, at cp/tree.c:4148

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |10.1.0, 8.3.0
             Status|UNCONFIRMED                 |NEW
            Summary|internal compiler error: in |[11/12 Regression] internal
                   |cp_tree_equal, at           |compiler error: in
                   |cp/tree.c:4148              |cp_tree_equal, at
                   |                            |cp/tree.c:4148
      Known to fail|                            |11.1.0
           Keywords|                            |error-recovery,
                   |                            |ice-on-invalid-code
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-08-12

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

[Bug c++/100853] [11/12 Regression] internal compiler error: in cp_tree_equal, at cp/tree.c:4148

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |trivial
   Target Milestone|---                         |11.3

[Bug c++/100853] [11/12 Regression] internal compiler error: in cp_tree_equal, at cp/tree.c:4148

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4

[Bug c++/100853] [11/12 Regression] internal compiler error: in cp_tree_equal, at cp/tree.c:4148 since r11-2275-g5324a3e621d9a2ee

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection             |
            Summary|[11/12 Regression] internal |[11/12 Regression] internal
                   |compiler error: in          |compiler error: in
                   |cp_tree_equal, at           |cp_tree_equal, at
                   |cp/tree.c:4148              |cp/tree.c:4148 since
                   |                            |r11-2275-g5324a3e621d9a2ee
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |nathan at gcc dot gnu.org

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r11-2275-g5324a3e621d9a2ee.

[Bug c++/100853] [11/12 Regression] internal compiler error: in cp_tree_equal, at cp/tree.c:4148 since r11-2275-g5324a3e621d9a2ee

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|11.3                        |11.4

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 11.3 is being released, retargeting bugs to GCC 11.4.

[Bug c++/100853] [11/12/13/14 Regression] internal compiler error: in cp_tree_equal, at cp/tree.c:4148 since r11-2275-g5324a3e621d9a2ee

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100853

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|11.4                        |11.5

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 11.4 is being released, retargeting bugs to GCC 11.5.