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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/106977] [13 regression] d21 dies with SIGBUS on 32-bit Darwin
Date: Fri, 24 Feb 2023 08:46:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106977

--- Comment #25 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to ibuclaw from comment #24)
> (In reply to Iain Sandoe from comment #23)
> > So the ABIs differ in this (as noted on IRC, the Darwin 32b ABIs are no=
t the
> > same as Linux).
> I'm still yet to work out why D on 32-bit Darwin behaves the same as 32-b=
it
> Linux though.  I would have assumed the decision to generate an sret would
> occur long after the front-end has freed itself from the compilation proc=
ess.

there should be some target hook to query whether a struct returns in regs.

> Regardless, the ABI issue can be raised in a separate PR. Because of it
> though, that means for this bootstrap PR we just have to avoid calling any
> extern(C++) method implemented in D that returns a struct by value.

Note that this would affect any interface to libc or external C++ that retu=
rns
a small struct.  AFAIR, X86 Darwin is not the only platform that returns sm=
all
structs in regs.=