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Subject: [Bug c++/97566] [[no_unique_address]] causes miscompiles when mixed
 with EBO in constexpr context
Date: Wed, 07 Jul 2021 21:36:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97566

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:38fed4dfa25ac4894546f0589340ebfc5eef3bee

commit r11-8704-g38fed4dfa25ac4894546f0589340ebfc5eef3bee
Author: Jason Merrill <jason@redhat.com>
Date:   Thu Jun 24 17:32:02 2021 -0400

    c++: constexpr aggr init of empty class [PR101040]

    This is basically the aggregate initializer version of PR97566; as in t=
hat
    bug, we are trying to initialize empty field 'obj' in 'single' when the=
re's
    no CONSTRUCTOR entry for the 'single' base class subobject of 'derived'=
.=20
As
    with that bug, the fix is to stop trying to add entries for empty field=
s,
    this time in cxx_eval_bare_aggregate.

    The change to the other function isn't necessary for this version of
    the patch, but seems worthwhile for robustness anyway.

            PR c++/101040
            PR c++/97566

    gcc/cp/ChangeLog:

            * class.c (is_empty_field): Handle null argument.
            * constexpr.c (cxx_eval_bare_aggregate): Discard initializer
            for empty field.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/no_unique_address13.C: New test.=