[Bug 223300] www/firefox (56+) fails to build using lang/rust (1.21+) built with PORT_LLVM=on: error[E0432]: unresolved import `x86::sse2`

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223300

--- Comment #40 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Mikhail T. from comment #38)
> Maybe, that's because I compiled rust itself (1.22.1) with "march=native"? 

Well, I use CPUTYPE=native myself (on -CURRENT amd64) and on head-i386
poudriere jail. Obviously, MACHINE_CPU had to be populated manually because
bsd.cpu.mk is dumb (see bug 112997).

> may also want to add the `-C codegen-units=${MAKE_JOBS_NUMBER}` to parallelize the compilations.

No, -C codegen-units pessimizes LTO which is enabled by default for release
builds. ThinLTO isn't ready yet.

https://internals.rust-lang.org/t/help-test-out-thinlto/6017

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