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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98884] Implement empty struct optimisations on ARM
Date: Fri, 29 Jan 2021 11:43:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98884

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |target
             Target|                            |arm

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
IIRC x86_64 had to change how empty structs are passed, to make C++ consist=
ent
with the x86_64 psABI as used by C (and it wasn't a trivial change to get
right).

If the ARM ABI requires stack space for them then that's unavoidable, but
they're just padding bytes so leaving that stack space uninitialized should=
 be
OK.

Reassigning to the arm target.=