[Bug c++/95955] New: ICE: tree check: expected integer_type or enumeral_type or boolean_type or real_type or fixed_point_type, have union_type in int_fits_type_p, at tree.c:8952

[Bug c++/95955] New: ICE: tree check: expected integer_type or enumeral_type or boolean_type or real_type or fixed_point_type, have union_type in int_fits_type_p, at tree.c:8952

[haoxintu at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95955

            Bug ID: 95955
           Summary: ICE: tree check: expected integer_type or
                    enumeral_type or boolean_type or real_type or
                    fixed_point_type, have union_type in int_fits_type_p,
                    at tree.c:8952
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

This code, bug.cc, reduced by C-Reduce, makes GCC-trunk ICE.

$cat bug.cc
enum class a : struct {}
template < < > > enum class a : union b {}
enum class a { c

$g++ bug.cc
bug.cc:1:25: error: expected ‘;’ after struct definition
    1 | enum class a : struct {}
      |                         ^
      |                         ;
bug.cc:1:24: error: underlying type ‘<unnamed struct>’ of ‘a’ must be an
integral type
    1 | enum class a : struct {}
      |                        ^
bug.cc:2:12: error: expected identifier before ‘<’ token
    2 | template < < > > enum class a : union b {}
      |            ^
bug.cc:2:12: error: expected ‘>’ before ‘<’ token
bug.cc:2:43: error: expected ‘;’ after union definition
    2 | template < < > > enum class a : union b {}
      |                                           ^
      |                                           ;
bug.cc:3:12: error: different underlying type in enum ‘enum class a’
    3 | enum class a { c
      |            ^
bug.cc:1:24: note: previous definition here
    1 | enum class a : struct {}
      |                        ^
bug.cc:3:16: internal compiler error: tree check: expected integer_type or
enumeral_type or boolean_type or real_type or fixed_point_type, have union_type
in int_fits_type_p, at tree.c:8952
    3 | enum class a { c
      |                ^
0x7c2dcf tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../gcc/tree.c:9685
0x7c9ce1 tree_check5(tree_node const*, char const*, int, char const*,
tree_code, tree_code, tree_code, tree_code, tree_code)
        ../../gcc/tree.h:3648
0x7c9ce1 int_fits_type_p(tree_node const*, tree_node const*)
        ../../gcc/tree.c:8952
0x911daa build_enumerator(tree_node*, tree_node*, tree_node*, tree_node*,
unsigned int)
        ../../gcc/cp/decl.c:15906
0x9a2447 cp_parser_enumerator_definition
        ../../gcc/cp/parser.c:19545
0x9a2447 cp_parser_enumerator_list
        ../../gcc/cp/parser.c:19474
0x9a2447 cp_parser_enum_specifier
        ../../gcc/cp/parser.c:19405
0x9a2447 cp_parser_type_specifier
        ../../gcc/cp/parser.c:17734
0x9a2a02 cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.c:14410
0x9a35c1 cp_parser_simple_declaration
        ../../gcc/cp/parser.c:13664
0x9cc926 cp_parser_declaration
        ../../gcc/cp/parser.c:13484
0x9cd06a cp_parser_translation_unit
        ../../gcc/cp/parser.c:4761
0x9cd06a c_parse_file()
        ../../gcc/cp/parser.c:44043
0xae4dbb c_common_parse_file()
        ../../gcc/c-family/c-opts.c:1190
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.


$g++ --version
g++ (GCC) 11.0.0 20200626 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[Bug c++/95955] ICE: tree check: expected integer_type or enumeral_type or boolean_type or real_type or fixed_point_type, have union_type in int_fits_type_p, at tree.c:8952

[haoxintu at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95955

W E Brown <webrown.cpp at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |webrown.cpp at gmail dot com

--- Comment #1 from Haoxin Tu <haoxintu at gmail dot com> ---
Add a more readable case

$cat p.c
enum class a : struct{};
template < template <class> class A > 
enum class a : union b {};
enum class a { c;}

$g++ p.cc
p.cc:1:23: error: underlying type ‘<unnamed struct>’ of ‘a’ must be an integral
type
    1 | enum class a : struct{};
      |                       ^
p.cc:4:12: error: different underlying type in enum ‘enum class a’
    4 | enum class a { c;}
      |            ^
p.cc:1:23: note: previous definition here
    1 | enum class a : struct{};
      |                       ^
p.cc:4:16: internal compiler error: tree check: expected integer_type or
enumeral_type or boolean_type or real_type or fixed_point_type, have union_type
in int_fits_type_p, at tree.c:8952
    4 | enum class a { c;}
      |                ^

[Bug c++/95955] ICE: tree check: expected integer_type or enumeral_type or boolean_type or real_type or fixed_point_type, have union_type in int_fits_type_p, at tree.c:8952

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95955

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-07-08
             Status|UNCONFIRMED                 |NEW

[Bug c++/95955] ICE: tree check: expected integer_type or enumeral_type or boolean_type or real_type or fixed_point_type, have union_type in int_fits_type_p, at tree.c:8952

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95955

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P5

[Bug c++/95955] ICE: tree check: expected integer_type or enumeral_type or boolean_type or real_type or fixed_point_type, have union_type in int_fits_type_p, at tree.c:8952

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95955

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|NEW                         |RESOLVED

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 96442.

s/union/struct/ in the testcase in comment #0 and you will get exact testcase.

*** This bug has been marked as a duplicate of bug 96442 ***