Date: Tue, 18 Aug 2020 14:13:11 +0200 From: "Hartmann, O." <o.hartmann@walstatt.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: "O. Hartmann" <ohartmann@walstatt.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: ld: error: duplicate symbol: Message-ID: <20200818141311.557eff8b@hermann.fritz.box> In-Reply-To: <B7F9F85B-60A4-4A87-9911-BDE1CBC7BC91@FreeBSD.org> References: <20200817154208.42d25b89@freyja> <B7F9F85B-60A4-4A87-9911-BDE1CBC7BC91@FreeBSD.org>
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--Sig_/V+KXbExAILuTz3WJu219sIv Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Mon, 17 Aug 2020 21:49:52 +0200 Dimitry Andric <dim@FreeBSD.org> wrote: > On 17 Aug 2020, at 15:42, O. Hartmann <ohartmann@walstatt.org> wrote: > >=20 > > On CURRENT 9not necessarily most recent with LLVM11, but since noon > > of today it is FreeBSD 13.0-CURRENT #15 r364297: Mon Aug 17 > > 14:39:06 CEST 2020 amd64) I'm faced with some very sticky and nasty > > micompilations in several essential ports, for instance > >=20 > > ports-mgmt/pkg > > devel/libunwind > > devel/binutils > >=20 > > In most cases somewhere in the (parallel) build the process fails > > with the error > >=20 > > ld: error: duplicate symbol: xxxxxxxx =20 >=20 > This is because clang 11 (and gcc 10) now default to -fno-common. The > rationale is explained pretty well in > <https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommitdiff;h=3D6271dd984d7f920d= 4fb17ad37af6a1f8e6b796dc>: >=20 > "GCC currently defaults to -fcommon. As discussed in the PR, this is > an ancient C feature which is not conforming with the latest C > standards. On many targets this means global variable accesses have > a codesize and performance penalty. This applies to C code only, C++ > code is not affected by -fcommon. It is about time to change the > default." >=20 > A quick fix is to add CFLAGS+=3D-fcommon to your make.conf, but that is > rather a big hammer. It is better to add it to just the ports that > show problems due to duplicated symbols. And ideally, those duplicated > symbols should be patched out of the ports. >=20 > For example, ports-mgmt/pkg already has such a patch: > https://github.com/freebsd/pkg/commit/7fbde60c4af4a1a07db7c5c36efbb2a495f= 7b1a4 > but I have no idea why it is not yet in the ports tree. >=20 > -Dimitry >=20 Thank you for the fast response and thorough explanation. oh --Sig_/V+KXbExAILuTz3WJu219sIv Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iHUEARYIAB0WIQSy8IBxAPDkqVBaTJ44N1ZZPba5RwUCXzvF1wAKCRA4N1ZZPba5 R/fvAQDdYX8jrecBjnld3L7/Tb9oeEGkkQtahR+YFLqGiq5IoQD/fgWDuzPNKaY1 OZA+Lo2D5wcs3D6WEgJbKpotXr0zYAo= =65HO -----END PGP SIGNATURE----- --Sig_/V+KXbExAILuTz3WJu219sIv--
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