Date: Mon, 15 Jan 2018 18:37:47 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: Luca Pizzamiglio <pizzamig@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org>, FreeBSD Ports <freebsd-ports@freebsd.org>, Ed Maste <emaste@freebsd.org> Subject: Re: atomic in i386 Current after CLANG 6 upgrade Message-ID: <85AE8E52-FC6C-4522-B5B1-7423A163DDFE@FreeBSD.org> In-Reply-To: <CAB88xy96bTtauBJtZyRbZCVDgKtgpv%2BQiZ29aWqe%2B_dud9domA@mail.gmail.com> References: <CAB88xy96bTtauBJtZyRbZCVDgKtgpv%2BQiZ29aWqe%2B_dud9domA@mail.gmail.com>
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--Apple-Mail=_27AEB962-99CF-4F1E-B6E5-78994B427340 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii On 15 Jan 2018, at 11:43, Luca Pizzamiglio <pizzamig@freebsd.org> wrote: > > I've already received a couple of messages from pkg-fallout about build > failure on head-i386-default [1] [2] both pointing to the same errors, > about missing intrinsic symbols related to __atomic_* > > The clang documentation about C11 atomic builtins [3] stats that __atomic_* > are GCC extension and Clang provides them. > > It seems to me that this specific GCC-compatible builtin are enabled on > amd64, but not on i386. > Is there a way to enable GCC compatible __atomic_ builtin also on i386? > Or should I provide patches to adopt _c11_atomic_* instead of __atomic_* > for every ports that need it ? There is some strangeness going on with an upstream bug fix [1], which has the unintended side effect of sometimes emitting libcalls to __atomic functions that we do not have on i386. I've commented on the upstream bug report, but I do not know an easy workaround at this point. -Dimitry [1] https://bugs.llvm.org/show_bug.cgi?id=34347 --Apple-Mail=_27AEB962-99CF-4F1E-B6E5-78994B427340 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCWlzm6wAKCRCwXqMKLiCW ozAWAJwME/2Ru4INV79uICryq3N6LHRnPACdF/rC1d4UyUc5q/vePu0Am4fZNpE= =Ebo4 -----END PGP SIGNATURE----- --Apple-Mail=_27AEB962-99CF-4F1E-B6E5-78994B427340--
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