Linking with LLD · Issue #39915 · rust-lang/rust (original) (raw)

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Description

LLVM 4.0 is shipping with LLD enabled, though AFAIK it is not yet production-ready on all platforms. I believe we've got an LLVM upgrade planned soon to resolve AVR/emscripten problems anyway, so now's the time to start determining what we might need to do to support it, how it impacts compiler performance/binary size/runtime performance compared to our usual linkers, and what platforms on which we might want to enable it by default.

Current status (2020-04-24) summarized at #39915 (comment)

Possible problems:

• LLD has internal parallelism, and is not documented to have jobserver support, which can lead to poor contention resolution in practice