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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/100373] [12 Regression] Darwin, Compare-debug fail
 after r12-248-gb58dc0b803057
Date: Tue, 04 May 2021 11:03:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100373

--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 4 May 2021, iains at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100373
>=20
> --- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
> (In reply to Iain Sandoe from comment #3)
> > (In reply to Richard Biener from comment #2)
> > > Doesn't reproduce on x86_64-linux with bootstrapping with in-tree mpf=
r 4.1.0
> >=20
> > it might well be some corner-case, but Darwin is PIC by default, so it =
might
> > be worth trying --with-pic ?
>=20
> and -gstrict-dwarf, -gdwarf-2

That shouldn't really matter.  If you have preprocessed source of
a miscomparing object and you can reproduce with that and
-fcompare-debug + options that would be a good first step.
Then creduce the result and look where it differs in code generation.=