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Subject: [Bug c++/106369] [12/13 Regression] ICE in
 output_constructor_regular_field, at varasm.cc:5515 since
 r12-2975-g32c3a75390623a
Date: Sun, 31 Jul 2022 06:05:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106369

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:9efe4e153d994974afcbba09c3c683f5f4a19c63

commit r13-1901-g9efe4e153d994974afcbba09c3c683f5f4a19c63
Author: Jason Merrill <jason@redhat.com>
Date:   Tue Jul 26 11:02:21 2022 -0400

    c++: constexpr, empty base after non-empty [PR106369]

    Here the CONSTRUCTOR we were providing for D{} had an entry for the B b=
ase
    subobject at offset 0 following the entry for the C base, causing
    output_constructor_regular_field to ICE due to going backwards.  It mig=
ht
be
    nice for that function to be more tolerant of empty fields, but it also
    seems reasonable for the front end to prune the useless entry.

            PR c++/106369

    gcc/cp/ChangeLog:

            * constexpr.cc (reduced_constant_expression_p): Return false
            if a CONSTRUCTOR initializes an empty field.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/constexpr-lambda27.C: New test.=