Date: Wed, 16 May 2018 08:11:12 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Ed Maste <emaste@freebsd.org> Cc: Hans Petter Selasky <hps@selasky.org>, Emeric POUPON <emeric.poupon@stormshield.eu>, Oliver Pinter <oliver.pinter@hardenedbsd.org>, freebsd-arch <freebsd-arch@freebsd.org> Subject: Re: Can't build kernel anymore: amd64 kernel requires linker ifunc support Message-ID: <201805161511.w4GFBCTQ001108@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <CAPyFy2A-aWa5oKukOKWeAN3BCB07nXzLbO%2B_Txp5HHk0C0h9_g@mail.gmail.com>
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> On 16 May 2018 at 09:35, Rodney W. Grimes > <freebsd-rwg@pdx.rh.cn85.dnsmgr.net> wrote: > >> > >> LD=ld.lld make > >> > >> is the magic here. The kernel needs a new linker to properly link in the > >> ifunc, and that's not our ancient ld. lld does it, as does the latter-day > >> binutils. > > > > Since this now seems to be a mandatory thing to get a kernel built > > can it please be set in the Makefile that is needing it? > > It's already handled by the Makefile that needs it when using the > normal build process - i.e., "make buildworld buildkernel" (or > toolchain or kernel-toolchain followed by buildkernel). > > The failure arises when building a kernel the "old" way, using config > and then and make in the kernel directory. This inherently uses the > host's linker (/usr/bin/ld), which is too old to link the kernel. We > can't just add LD=ld.lld to the kernel's Makefile(s), because it would > break external toolchain and other cases where users use a specific > linker. I hope to introduce a KERNEL_LD Make variable that controls > the linker used for the kernel link, but it's more involved than a one > or two line change for the same reason that we can't just set > LD=ld.lld. > > ld.lld will start being installed as /usr/bin/ld once these two issues > are resolved: ... In the meantime what about reverting the ifunc usage until this can be done? > > pr227968 [exp-run] Update lang/ghc to 8.4.2, devel/stack to 1.7.1, and > all the */hs-* ports > pr214864 [exp-run] test build with lld as /usr/bin/ld > > The exp-run for the first is complete and I believe we are now just > waiting on the change to be committed. As soon as that happens I will > ask for another exp-run for the second PR, and will commit the change > to install lld by default as soon as it completes (assuming > successfully). > _______________________________________________ > freebsd-arch@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org" > -- Rod Grimes rgrimes@freebsd.org
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