unknown -z value: common-page-size=4096

[Shawn Webb]

On Fri, Sep 28, 2018 at 10:01:31PM -0400, Charlie Li wrote:
> I've switched to using devel/xtoolchain-llvm70 yesterday to build amd64
> base starting with r338990, and among other issues, ld.lld70 refuses to
> link the kernel:
> 
> Building /usr/local/obj/usr/local/src/amd64.amd64/sys/ARDMORE/kernel.full
> --- kernel.full ---
> linking kernel.full
> ld.lld: error: unknown -z value: common-page-size=4096
> ld.lld: error: unknown -z value: ifunc-noplt
> *** [kernel.full] Error code 1
> 
> make[2]: stopped in /usr/local/obj/usr/local/src/amd64.amd64/sys/ARDMORE
> 
> (ARDMORE is basically GENERIC-NODEBUG, not that it matters)
> 
> The ifunc-noplt is a known issue, it obviously didn't make it upstream
> in time for LLVM 7.0.0, and thus we carry the feature downstream.
> 
> The crux of this link error though, emaste@ quipped in PR 230604 that
> LLD prior to 7.0.0 accepted but ignored unknown options, but now at
> least 7.0.0 disallows unknown options entirely. Which brings up the -z
> common-page-size=4096: has LLD been ignoring this part the whole time,
> and is it of any meaningful use anymore (it seemed to mean something
> with bfd)?

I noticed the same issues. I reverted parts of recent work by upstream
FreeBSD in HardenedBSD's Cross-DSO CFI branch since that branch uses
clang/llvm/lld 7.0.0.

Thanks,

-- 
Shawn Webb
Cofounder and Security Engineer
HardenedBSD

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