Date: Wed, 5 Apr 2017 22:09:01 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: "freebsd-toolchain@freebsd.org" <freebsd-toolchain@freebsd.org> Subject: Re: April 2017 update on using LLVM's lld linker in the FreeBSD base system Message-ID: <EF7F1860-2F22-41D7-A791-BF772C4E6DEA@FreeBSD.org> In-Reply-To: <CAPyFy2ATORfYmtE_nPVd3Tc5igY5kUrnUNZNL5TLS9%2B=uh4KZQ@mail.gmail.com> References: <CAPyFy2ATORfYmtE_nPVd3Tc5igY5kUrnUNZNL5TLS9%2B=uh4KZQ@mail.gmail.com>
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--Apple-Mail=_FC4A7F6B-8E33-4A64-9A99-2F6F5DF955EA Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 5 Apr 2017, at 16:59, Ed Maste <emaste@freebsd.org> wrote: >=20 > Here's a fresh update on LLVM's LLD linker in the base system, > referencing the plan originally posted at the beginning of 2016. This > work is primarily taking place on amd64 right now, and unless > otherwise noted these results apply to amd64. >=20 > First, the completed items: >=20 >> 1. Update lld along with the Clang/LLVM 3.9 update that dim@ is = working on. >> 2. Add the bmake build infrastructure, installing as /usr/bin/ld.lld >> on the same architectures that use Clang (amd64, arm, arm64, i386). >> 3. Update lld again (most likely to a snapshot from upstream SVN) = once >> it is able to link an unmodified FreeBSD kernel. >=20 > We now have LLD 4.0.0 in the tree and it can build all of > FreeBSD/amd64 kernel and world, and most of ports. >=20 >> 4. Modify the boot loader and kernel builds to avoid using features >> not implemented by lld. >> 5. Introduce a WITH_LLD_AS_LD knob to have /usr/bin/ld be a ld.lld >> hardlink instead of /usr/bin/ld.bfd. >=20 > This became WITH_LLD_IS_LD for consistency with WITH_CLANG_IS_CC. It > also controls the bootstrap linker: adding WITH_LLD_IS_LD=3Dyes to > src.conf means that the system will be built with LLD, and LLD will be > /usr/bin/ld in the resulting world. >=20 > This option is currently enabled by default on arm64 (only). Note that as of r316432, all of the above is also available in the stable/11 branch. -Dimitry --Apple-Mail=_FC4A7F6B-8E33-4A64-9A99-2F6F5DF955EA 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 v2.0.30 iEYEARECAAYFAljlTukACgkQsF6jCi4glqNd+wCg2t7dCQXZXEbvMs/9o/P2nR80 zA0AoJoFqEFwZtVQcVNeOGkJa/6qUcVL =JzK8 -----END PGP SIGNATURE----- --Apple-Mail=_FC4A7F6B-8E33-4A64-9A99-2F6F5DF955EA--
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