Fails to build with lto=true in aarch64 architectures.

[LGFae]

For more details, check this issue.

The gist of it is:

image will, reliably, fail at the function image::io::free_functions::load_decoder() with the message:

Both operands to a binary operator are not of the same type!
  %7198 = xor i64 %7197, i32 4
in function _ZN5image2io14free_functions12load_decoder17h972a54ccb2943d7eE
LLVM ERROR: Broken function found, compilation aborted!

It appears to only happen when lto = true is chosen in the [profile.release] section of Cargo.toml.

Expected

The crate should compile.

Actual behaviour

Compilation stops with a broken function error.

Reproduction steps

Unfortunately, I do not own an aarch64 system, and cannot offer a minimal reproduction example. If someone could point out a way I could try going about that, I'd be more than willing to try.

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I do not know whether I should bring this directly to the rust team themselves, but thought it was better to first try my luck here instead.

[197g]

I do not know whether I should bring this directly to the rust team themselves, but thought it was better to first try my luck here instead.

I believe so. This is an LLVM specific error which should be invisible behind the Rust language, so not at all related to any implementation details we're doing here. (We're not making use of any inline assembly etc.). This is a bug in rustc.

[nekopsykose]

fyi this looks like rust-lang/rust#104099