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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98216] [C++20] std::array<double, N> template parameter
 error with negative values
Date: Mon, 14 Dec 2020 20:56:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98216

Patrick Palka <ppalka at gcc dot gnu.org> changed:

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

--- Comment #5 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Related testcase which may or may not be caused by the same underlying bug:

$ cat testcase.C
template <double s> void foo() {}
template void foo<-1.0>();
template void foo<-2.0>();

$ g++ -std=3Dc++20 testcase.C
testcase.C:3:26: error: Two symbols with same comdat_group are not linked by
the same_comdat_group list.
    3 | template void foo<-2.0>();=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20
      |                          ^=20=20
_Z3fooILdffffffff00000000EEvv/1 (void foo() [with double s =3D -2.0e+0])
@0x7fdb12c4aee0=20=20=20=20=20=20=20=20=20
  Type: function definition analyzed
  Visibility: force_output forced_by_abi no_reorder public weak
comdat_group:_Z3fooILdffffffff00000000EEvv one_only
  previous sharing asm name: 0
  References:=20
  Referring:=20=20=20=20=20=20=20=20=20=20
  Function flags: body
  Called by:=20
  Calls:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
_Z3fooILdffffffff00000000EEvv/0 (void foo() [with double s =3D -1.0e+0])
@0x7fdb12c4add0
  Type: function definition analyzed=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
  Visibility: force_output forced_by_abi no_reorder public weak
comdat_group:_Z3fooILdffffffff00000000EEvv one_only
  next sharing asm name: 1
  References:=20
  Referring:=20
  Function flags: body
  Called by:=20
  Calls:=20
testcase.C:3:26: internal compiler error: symtab_node::verify failed
0xbebe81 symtab_node::verify_symtab_nodes()
        /home/patrick/code/gcc/gcc/symtab.c:1406
0xc00586 symtab_node::checking_verify_symtab_nodes()
        /home/patrick/code/gcc/gcc/cgraph.h:675=20
0xc00586 symbol_table::compile()
        /home/patrick/code/gcc/gcc/cgraphunit.c:2277
0xc02f67 symbol_table::compile()
        /home/patrick/code/gcc/gcc/cgraphunit.c:2274
0xc02f67 symbol_table::finalize_compilation_unit()
        /home/patrick/code/gcc/gcc/cgraphunit.c:2542=