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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/97878] [8/9/10/11 Regression] ICE in
 cxx_eval_outermost_constant_expr, at cp/constexpr.c:6825
Date: Wed, 03 Feb 2021 14:41:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97878

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

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With
extern int a[];
auto [b] =3D a;
it is just error-recovery bug rather than ice-on-invalid-code:
pr97878-3.C:2:12: error: initializer fails to determine size of =E2=80=98<s=
tructured
bindings>=E2=80=99
    2 | auto [b] =3D a;
      |            ^
pr97878-3.C:2:12: internal compiler error: in cxx_eval_outermost_constant_e=
xpr,
at cp/constexpr.c:7127
0xaa8260 cxx_eval_outermost_constant_expr
        ../../gcc/cp/constexpr.c:7127
0xaa9a81 maybe_constant_init_1
        ../../gcc/cp/constexpr.c:7593
0xaa9b0b maybe_constant_init(tree_node*, tree_node*, bool)
        ../../gcc/cp/constexpr.c:7610
0xaa98e5 fold_non_dependent_init(tree_node*, int, bool, tree_node*)
        ../../gcc/cp/constexpr.c:7564
0xe4f994 store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc/cp/typeck2.c:767
0xb3807b check_initializer
        ../../gcc/cp/decl.c:7028
0xb3d512 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/cp/decl.c:7946
0xcbda72 cp_parser_decomposition_declaration
        ../../gcc/cp/parser.c:14663
The clang++ diagnostics doesn't make any sense either:
error: cannot decompose non-class, non-array type 'int *'
but doesn't crash the compiler.=