"[C is] optimised for speed, as long as your target is basically a fast PDP-11" http://t.co/CUPgG4GBcO -- limitations of C optimisations
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I'm never sure what version of Rust to target for my projects.
For difftastic I pinned to rust 1.57 and I haven't needed to bump it so far.
Debian stable is still on 1.48 though!
rustc is the only self-hosted compiler I've seen that uses external packages in the target language. Are there others?
LLVM is introducing v1 to v4 of x86-64, so you can target newer chips: https://github.com/llvm/llvm-project/commit/012dd42e027e (gcc will do the same thing)