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Subject: [Bug c++/28907] Wrong pointer cast with multiple inheritance
Date: Mon, 18 Apr 2022 15:45:55 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28907

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D2390419d1cb7=
2882110538e01e5586372df19657

commit 2390419d1cb72882110538e01e5586372df19657
Author: Tom Tromey <tom@tromey.com>
Date:   Sat Apr 2 09:54:40 2022 -0600

    Fix C++ cast of derived class to base class

    PR c++/28907 points out that casting from a derived class to a base
    class fails in some situations.  The problem turned out to be a
    missing use of value_embedded_offset.  One peculiarity here is that,
    if you managed to construct a pointer-to-derived with an embedded
    offset of 0, the cast would work -- for example, one of the two new
    tests here passes without the patch.

    This embedded offset stuff is an endless source of bugs.  I wonder if
    it's possible to get rid of it somehow.

    Regression tested on x86-64 Fedora 34.

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D28907

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