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Subject: [Bug c++/97878] [8/9 Regression] ICE in
 cxx_eval_outermost_constant_expr, at cp/constexpr.c:6825
Date: Tue, 20 Apr 2021 23:32:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97878

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:5c85df8968b00acc934396d7461a4a5ac6ddedd1

commit r9-9416-g5c85df8968b00acc934396d7461a4a5ac6ddedd1
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Feb 5 10:22:07 2021 +0100

    c++: Fix ICE with structured binding initialized to incomplete array
[PR97878]

    We ICE on the following testcase, for incomplete array a on auto [b] { =
a };
without
    giving any kind of diagnostics, with auto [c] =3D a; during error-recov=
ery.
    The problem is that we get too far through check_initializer and e.g.
    store_init_value -> constexpr stuff can't deal with incomplete array ty=
pes.

    As the type of the structured binding artificial variable is always
deduced,
    I think it is easiest to diagnose this early, even if they have array t=
ypes
    we'll need their deduced type to be complete rather than just its eleme=
nt
    type.

    2021-02-05  Jakub Jelinek  <jakub@redhat.com>

            PR c++/97878
            * decl.c (check_array_initializer): For structured bindings,
require
            the array type to be complete.

            * g++.dg/cpp1z/decomp54.C: New test.

    (cherry picked from commit 8b7f2d3eae16dd629ae7ae40bb76f4bb0099f441)=