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Subject: [Bug middle-end/20408] Unnecessary code generated for empty structs
Date: Fri, 12 Feb 2021 02:30:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D20408

--- Comment #25 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:031e97207463710797625382baff112b6c3ade51

commit r10-9362-g031e97207463710797625382baff112b6c3ade51
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Feb 8 17:04:03 2021 -0500

    c++: generic lambda, fn* conv, empty class [PR98326]

    Here, in the thunk returned from the captureless lambda conversion to
    pointer-to-function, we try to pass through invisible reference paramet=
ers
    by reference, without doing a copy.  The empty class copy optimization =
was
    messing that up.

    gcc/cp/ChangeLog:

            PR c++/98326
            PR c++/20408
            * cp-gimplify.c (simple_empty_class_p): Don't touch an invisiref
            parm.

    gcc/testsuite/ChangeLog:

            PR c++/98326
            * g++.dg/cpp1y/lambda-generic-empty1.C: New test.=