bcmp missing

[repmop]

LLVM emits bcmp for #![no_builtins], #![no_std] enabled crates on rustc 1.43.0 while targeting i686-unknown-linux-musl.

This was supposedly resolved in #303, but still appears to be a problem.

Specifically, the memcmp here is being converted to a bcmp.

[josephlr]

This doesn't seem like a bug, emitting bcmp instead of memcmp on musl seems fine.

What's worked for me is either:

• Using musl's libc, which has bcmp
• Using this crate with the mem feature enabled (which is done by default with cargo-xbuild)

EDIT: It should be noted that the call in SlicePartialEq should be converted to a bcmp, as LLVM converts all memcmp(...) == 0 calls to bcmp(...) == 0, as this is sometimes faster.

[Amanieu]

compiler-builtins provides an implementation of bcmp so this should work fine.