LLVM ERROR: Not supported instr: <MCInst 258 <MCOperand Reg:1> <MCOperand Imm:15> <MCOperand Reg:45>>

[stappersg]

This issue is a pointer to rust-lang/compiler-builtins#400
it is about

"LLVM ERROR: Not supported instr" on avr-unknown-gnu-atmega328

[stappersg]

See also Rahix/avr-hal#124 (comment) for how to use nighty.

just change to this version (I am on windows)

rustup default nightly-2021-01-07-x86_64-pc-windows-msvc
rustup default nightly-2021-01-07-x86_64-pc-windows-msvc
cargo build -Z build-std=core --target avr-atmega328p.json --release

and you will be back in business.

[TheNotary]

Don't forget to:

rustup override unset

Since the README has you lock in the latest nightly. That override was soo confusing, I don't really work with rust but in one of the issues someone mentioned using a rust-toolchain file in the root. Can we do this instead?

(rust-toolchain)

[toolchain]
channel = "nightly-2021-01-07"
components = ["rust-src"]

[stappersg]

Can we do this instead?

That this is proposed in #32 and might be inspired by Rahix/avr-hal#124 (comment)

[chinoto]

@stappersg Nah, I was aware of rust-toolchain beforehand and didn't like having to include +nightly-2021-01-07 (and the avr hertz and target arch) each time, but I had to lookup how to do the TOML variant so it would automatically fetch the rust-src too. Reminds me of "convergent evolution", we naturally came to the same solutions because they work well.

[stappersg]

rust-lang/compiler-builtins#400 is reported as being closed.

Next challenge is the llvm_asm! to asm! switch. Yes that is our #38 ...

[stappersg]

#38 is fixed, blink does compile again.