[Bug 223300] www/firefox (firefox-56.0.2_3,1) with rust-1.21.0 on amd64: error[E0432]: unresolved import `x86::sse2`

[bugzilla-noreply at freebsd.org]

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

--- Comment #17 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to vvd from comment #16)
> Too long time for compile the rust with embedded llvm.

It's a stripped down version: no compiler-rt, no clang, no extra clang tools,
no lld, no lldb, no openmp. lang/rust also takes a lot of time to build because
it does a poor job of parallelizing release builds.

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

> And I already have the llvm 4.0.1 installed.

PORT_LLVM=on statically links LLVM, so you don't save space. Given both bundled
llvm and devel/llvm* have similar dependencies if one of those is obsolete
poudriere would force a rebuild unless you trick it into not looking at the
whole dependency chain.

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