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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/88101] Implement P0528R3, C++20 cmpxchg and padding
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Date: Sun, 15 Nov 2020 17:30:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88101

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 49563
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49563&action=3Dedit
gcc11-pr88101-wip.patch

Here is completely untested WIP of __builtin_clear_padding builtin, so far
doesn't handle bit-fields, unions, VLAs and has a couple of other FIXMEs.
I'll try to complete this virtually from Baker Island (AoE timezone) tonight
before stage1 closes there.  Also I'll probably need to remember the origin=
ally
passed pointer type in e.g. second artificial argument of the builtin (NULL=
),
in case already before or during lower pass something would forward propaga=
te
the argument.=