[Bug c++/83374] [DR1813] Bad std::is_standard_layout with two base class subobjects of the same type

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83374

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Jul  5 14:45:30 2019
New Revision: 273139

URL: https://gcc.gnu.org/viewcvs?rev=273139&root=gcc&view=rev
Log:
        DR 1813
        PR c++/83374 - __is_standard_layout wrong for a class with repeated
bases.
        * class.c (check_bases): Set CLASSTYPE_NON_STD_LAYOUT for a class if
        CLASSTYPE_REPEATED_BASE_P is true.

        * g++.dg/ext/is_std_layout3.C: New test.
        * g++.dg/ext/is_std_layout4.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/ext/is_std_layout3.C
    trunk/gcc/testsuite/g++.dg/ext/is_std_layout4.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/class.c
    trunk/gcc/testsuite/ChangeLog