bugadani / xtensa-rust-bug-repro

Repro for https://github.com/esp-rs/rust/issues/95

This repository contains a reproduction for this issue

Instructions

build using:

cargo +esp rustc --target=xtensa-esp32-espidf -Z build-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort

Expected output: project compiles fine. Actual output:

❯ cargo +esp rustc --target=xtensa-esp32-espidf -Z build-std=std,panic_abort -Zbuild-std-features=panic_immediate_abort 
   Compiling foolib v0.1.0 (C:\_OpenSource\idftest\foolib)
LLVM ERROR: Not supported instr: <MCInst 271 <MCOperand Reg:42>>
error: could not compile `foolib`

Additional information:

• Offending code needs to be in foolib. Moving it to src/lib.rs results in a successful build.
• Issue doesn't reproduce using opt-level="z"
• Placing #[inline(never)] on Enum::foo results in a successful build.