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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100340] Bootstrap fails with Clang 12.0.5 (XCode 12.5)
Date: Tue, 25 May 2021 16:25:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100340

--- Comment #9 from Iain Sandoe <iains at gcc dot gnu.org> ---
JFTR the Apple OSS folks comment:

"I checked with the clang team =E2=80=94 it appears this was an unintention=
al
consequence of an upstream change: https://reviews.llvm.org/D75203. This
difference between debug vs non-debug asm has been noticed upstream and the=
 new
assembly optimization has been disabled (for now) in
https://reviews.llvm.org/D94542 already.

You should be able to avoid this issue with clang-1205 by adding in the `-m=
llvm
-x86-pad-for-align=3Dfalse` flags to the build. I confirmed this resolved t=
he
issue for me with the small reproducer. "

however, that means we will need to do some configury checks to decide if t=
his
fix needs to be applied or not (and maybe that would best be deferred until=
 we
see what version of Xcode contains a fix).=