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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106890] [10/11/12/13 Regression] virtual inheritance
 triggers compiler error when instatiating derived class with in-class
 initialization since r8-2709-g12659e10c7820071
Date: Tue, 21 Mar 2023 15:09:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106890

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:041a164ec9b467f9ac2f15980f83f17e3f8ea150

commit r13-6788-g041a164ec9b467f9ac2f15980f83f17e3f8ea150
Author: Jason Merrill <jason@redhat.com>
Date:   Sat Mar 18 08:27:26 2023 -0400

    c++: DMI in template with virtual base [PR106890]

    When parsing a default member init we just build a CONVERT_EXPR for
    converting to a virtual base, and then expand that into the more complex
    form when we actually use the DMI in a constructor.  But that wasn't
working
    for the template case where we are considering the conversion at the po=
int
    that the constructor needs the DMI instantiation, so it seemed like we =
were
    in a constructor already.  And then when the other constructor tries to
    reuse the instantiation, it sees uses of the first constructor's
parameters,
    and dies.  So ensure that we get the CONVERT_EXPR in this case, too.

            PR c++/106890

    gcc/cp/ChangeLog:

            * init.cc (maybe_instantiate_nsdmi_init): Don't leave
            current_function_decl set to a constructor.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/nsdmi-template25.C: New test.=