[Bug c++/93905] [8 Regression] Cannot use Derived type of Base containing both enum and protected destructor

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93905

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-8 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:f4335f978249a2991620f38e118adf790e677968

commit r8-10082-gf4335f978249a2991620f38e118adf790e677968
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Feb 26 09:02:05 2020 +0100

    c++: Fix rejects-valid bug in cxx_eval_outermost_constant_expr [PR93905]

    The following testcase is rejected in 8.3, but was accepted in 8.2 and
    is in 9.x.  This started with my PR87934
        * constexpr.c (cxx_eval_constant_expression) <case CONSTRUCTOR>: Do
        re-process TREE_CONSTANT CONSTRUCTORs if they aren't reduced constant
        expressions.
    backport, where the NSDMI CONSTRUCTOR that contains CONST_DECLs is now
    constexpr evaluated so that it doesn't contain them.  The difference from
    9.x is that 9.x doesn't call get_target_expr if we got a CONSTRUCTOR for a
    class type for something that has been originally a CONSTRUCTOR too.

    This patch cherry-picks just that hunk of the r9-3835 change.

    2020-02-26  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93905
        Backported from mainline
        2018-11-04  Jason Merrill  <jason@redhat.com>

        * constexpr.c (cxx_eval_outermost_constant_expr): Don't wrap a
        CONSTRUCTOR if one was passed in.

        * g++.dg/cpp0x/pr93905.C: New test.