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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103480] [10/11/12 Regression] -Werror=useless-cast with
 constexpr destructor
Date: Tue, 30 Nov 2021 00:46:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103480

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|-Werror=3Duseless-cast with   |[10/11/12 Regression]
                   |constexpr destructor        |-Werror=3Duseless-cast with
                   |                            |constexpr destructor
   Target Milestone|---                         |10.4
           Priority|P3                          |P2

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r10-6527:

commit aaa26bf496a646778ac861aed124d960b5bf549f
Author: Jason Merrill <jason@redhat.com>
Date:   Sun Jan 26 22:58:32 2020 -0500

    c++: Use constexpr to avoid wrong -Wsign-compare (PR90691).

    We would like to do constexpr evaluation to avoid false positives on
    warnings, but constexpr evaluation can involve function body copying th=
at
    changes DECL_UID, which breaks -fcompare-debug.  So let's remember
    that we need to avoid that.

            PR c++/90691
            * expr.c (fold_for_warn): Call maybe_constant_value.
            * constexpr.c (struct constexpr_ctx): Add uid_sensitive field.
            (maybe_constant_value): Add uid_sensitive parm.
            (get_fundef_copy): Don't copy if it's true.
            (cxx_eval_call_expression): Don't instantiate if it's true.
            (cxx_eval_outermost_constant_expr): Likewise.=