Date: Thu, 10 May 2018 08:34:14 -0400 From: Ed Maste <emaste@freebsd.org> To: "freebsd-toolchain@FreeBSD.org" <freebsd-toolchain@freebsd.org>, FreeBSD Ports <freebsd-ports@freebsd.org> Subject: Re: Heads-up: linker (lld) changes for amd64 coming soon Message-ID: <CAPyFy2BFsvwCiPBpYmg7TkfxmB8NYhznBZz%2BX1BCU5gD4q8zAA@mail.gmail.com> In-Reply-To: <CAPyFy2AjEJjryjgGCHAo107mkOUnFbKmkcMVFWQEKKbTEuu8AA@mail.gmail.com> References: <CAPyFy2AjEJjryjgGCHAo107mkOUnFbKmkcMVFWQEKKbTEuu8AA@mail.gmail.com>
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On 26 March 2018 at 22:14, Ed Maste <emaste@freebsd.org> wrote: > Some changes related to the amd64 linker are nearly ready to be > committed (within a week or three), so I'm sending this notice to > request any final comments or concerns before these changes are made. It took somewhat longer than a week or three, but these changes will now happen quite soon. > 1. Kostik (kib@) has a patch to start using kernel ifunc, with the > first use being Supervisor Mode Access Prevention (SMAP) on amd64. > This relies on linker support that is available in the in-tree lld and > in contemporary binutils ld.bfd from ports, but not in the in-tree > ld.bfd 2.17.50. This is ready to be committed at any time. > 2. WITH_LLD_IS_LD controls whether /usr/bin/ld is ld.bfd or ld.lld, > and thus the linker used for linking ports. I plan to switch this to > default on. There was one significant remaining issue in the ports tree with lld as /usr/bin/ld: lang/ghc. This was due (at least in part) to a bug in lld's note handling. The bug is now fixed upstream and in FreeBSD in r333401. The latest version of ghc claims to have improved support for using lld as the linker, and a lang/ghc update is currently in progress (PR227968). Once this is committed I will request one more exp-run with lld. As long as those results are acceptable, I'll then make the switch to install lld as /usr/bin/ld on amd64.
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