Date: Tue, 2 Aug 2016 10:08:04 +0100 From: David Chisnall <theraven@FreeBSD.org> To: Ed Maste <emaste@freebsd.org> Cc: "freebsd-toolchain@freebsd.org" <freebsd-toolchain@freebsd.org> Subject: Re: Update on using LLVM's lld linker in the FreeBSD base system Message-ID: <D7DFE5C9-2A34-479D-B5E3-170AD087F7F4@FreeBSD.org> In-Reply-To: <CAPyFy2AN7iJ1L7gM=qjsBq8_NKTA-t-u-GSk5%2B-pWX%2B_V5ztzQ@mail.gmail.com> References: <CAPyFy2D-j6djHHiXk9D3dmj5xXjKGgoOEnUK7rHvbc=Hc28dxA@mail.gmail.com> <CAPyFy2AN7iJ1L7gM=qjsBq8_NKTA-t-u-GSk5%2B-pWX%2B_V5ztzQ@mail.gmail.com>
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On 2 Aug 2016, at 05:19, Ed Maste <emaste@freebsd.org> wrote:
>=20
>>> 6. Request ports exp-runs and issue a call for testing with 3rd =
party
>>> software. Fix issues found during this process.
>>=20
>> Experience suggests this may be the long poll :)
>=20
> Indeed, and that's a big part of my motivation for trying to make lld
> more readily available as early as possible, even if we're still
> waiting on some required features.
I believe that all of the base system clang=E2=80=99s for supported =
branches support -fuse-ld=3Dlld (perhaps 10.0 didn=E2=80=99t?), so if we =
have an lld candidate in ports then it should be easy for user to test =
it by doing a pkg ins lld and setting LDFLAGS. Failing that, the =
fallback to just replacing /usr/bin/ld with a symlink to =
/usr/local/bin/ld.lld would probably work for ports testing.
We=E2=80=99re probably going to want a =E2=80=98needs bfd / gold instead =
of lld=E2=80=99 knob for a while. We might need to patch the gcc =
versions in ports to accept -fuse-ld=3Dlld[1].
I suspect the longer tail for LTO. There is a bunch of low-hanging =
fruit in the FreeBSD tree where LTO would likely be a win (I=E2=80=99d =
expect most of the statically linked stuff to get smaller, if nothing =
else).
David
[1] gcc and clang interpret -fuse-ld differently. In clang, =
-fuse-ld=3D{foo} means =E2=80=98${PATH}/ld.{foo}=E2=80=99 is the linker =
and you should error out if it doesn=E2=80=99t exist. gcc instead hard =
codes bfd and gold as the two valid options and rejects anything else.=
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