ESP8266 build regression

[vmarkushin]

Hi,

After today's update, I started getting this compilation error of 'quickstart' project:

$ cargo xbuild      
<...>
LLVM ERROR: Error while trying to spill A8 from class AR: Cannot scavenge register without an emergency spill slot!
error: could not compile `core`.

...and another error when building with xargo:

$ xargo build
error: cannot produce bin for `esp32-test v0.1.0 (/Users/vmark/dev/emb/xtensa-rust-quickstart)` as the target `xtensa-esp8266-none-elf` does not support these crate types

Rustc info:

rustc 1.44.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-apple-darwin
release: 1.44.0-dev
LLVM version: 9.0

Note: for xtensa-esp32-none-elf target the project compiles successfully.

Should I report the issue on espressif's LLVM fork?

[MabezDev]

Thanks for the report! The current ABI in the rust-xtensa, is based of the old forks ABI. It's quite possible that, this ABI implementation is now wrong, especially for the esp8266 as this gets tested alot less than the esp32. I opened #18 previously as I was concerned this might be the case.

Unfortunately, I've had a lot on my plate recently, and haven't had a chance to review. Hopefully I can take a look soon, or if you wish, it would be great to get someone else's eyeballs on it!

[zinahe]

@vmarkushin,

Please see below regarding the second error:

#29 (comment)

After that, I was able to build and run a "blinky" on ESP8266.

Cheers,

-Zinahe A.

[vmarkushin]

@zinahe
This kinda helped me. I also, switched from xargo to cargo-xbuild to successfully build the project.