[Bug c++/80431] Use of "this" pointer in member initializer causes constructor not to be called (or ICE on gcc 7)

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80431

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:de31f5445b12fd9ab9969dc536d821fe6f0edad0

commit r12-1697-gde31f5445b12fd9ab9969dc536d821fe6f0edad0
Author: Patrick Palka <ppa...@redhat.com>
Date:   Mon Jun 21 07:54:26 2021 -0400

    c++: conversion to base of vbase in NSDMI [PR80431]

    The delayed processing of conversions to a virtual base in an NSDMI
    assumes the target base type is a (possibly indirect) virtual base of
    the current class, but the target base type could also be a base of a
    virtual base, as in the testcase below.  Since such a base isn't a part
    of CLASSTYPE_VBASECLASSES, we end up miscompiling the testcase due to
    the call to build_base_path (with binfo=NULL_TREE) silently returning
    error_mark_node.  Fix this by using convert_to_base to build the
    conversion instead.

            PR c++/80431

    gcc/cp/ChangeLog:

            * tree.c (bot_replace): Use convert_to_base to build the
            conversion to the (morally) virtual base.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/nsdmi-virtual1a.C: New test.