cannot find macro `llvm_asm` in this scope

[zag2art]

hi, getting this during compiling

cargo build -Z build-std=core --target avr-atmega328p.json --release
...

   Compiling avr_delay v0.3.1
error: cannot find macro `llvm_asm` in this scope
  --> /Users/zag2art/.cargo/registry/src/github.com-1ecc6299db9ec823/avr_delay-0.3.1/src/lib.rs:34:17
   |
34 |         unsafe {llvm_asm!("1: sbiw $0,1
   |                 ^^^^^^^^

error: cannot find macro `llvm_asm` in this scope
  --> /Users/zag2art/.cargo/registry/src/github.com-1ecc6299db9ec823/avr_delay-0.3.1/src/lib.rs:41:13
   |
41 |     unsafe {llvm_asm!("1: sbiw $0,1
   |             ^^^^^^^^

is that an avr_delay issue or this blink project?

Note: compiling this on Mac folowing "The AVR-Rust Guidebook"

[stappersg]

Note: compiling this on Mac folowing "The AVR-Rust Guidebook"

And what is the URL of "The AVR-Rust Guidebook"?

[zag2art]

https://book.avr-rust.com/003.3-example-building-blink.html

[stappersg]

It is avr-rust/delay#10

[stappersg]

For what it is worth

    ...
   Compiling avr-config v1.0.0
   Compiling avr-config v2.0.1
   Compiling avr-std-stub v1.0.2
   Compiling avr_delay v0.3.1
   Compiling blink v0.1.0 (/usr/src/rust/avr/blink)
    Finished release [optimized] target(s) in 33.68s
stappers@paddy:/usr/src/rust/avr/blink
$ cargo build -Z build-std=core --target avr-atmega328p.json --release
    Finished release [optimized] target(s) in 0.11s
stappers@paddy:/usr/src/rust/avr/blink
$ history | tail -n 6
 2070  rustup override set nightly-2021-01-07
 2071  cargo build -Z build-std=core --target avr-atmega328p.json --release
 2072  rustup component add rust-src
 2073  cargo build -Z build-std=core --target avr-atmega328p.json --release
 2074  cargo build -Z build-std=core --target avr-atmega328p.json --release
 2075  history | tail -n 6
stappers@paddy:/usr/src/rust/avr/blink
$ 

[zag2art]

Thanks, that helped

rustup override set nightly-2021-01-07
rustup component add rust-src
cargo build -Z build-std=core --target avr-atmega328p.json --release

Looks like it works only with nightly-2021-01-07 release.

[stappersg]

Re-opened.
To prevent new reports of it.

Those who are also bitten by this issue (can|should) put updates here.

[ShaneEverittM]

So currently the only solution is to use an old nightly compiler? Is the ultimate goal to change the implementation to not depend on llvm_asm!?

[stappersg]

The ultimate goal is a good live.

So currently the only solution is to use an old nightly compiler? Is the ultimate goal to change the implementation to not depend on llvm_asm!?

Yes. Indeed.

How long currently will exist is unknown. ( It is unknown to me how the LLVM project moves forward )
Known there are workaround projects such as https://www.reddit.com/r/rust/comments/tvtxpv/custom_rust_toolchain_for_avr/

[stappersg]

OKay, LLVM project moved forward, the blocking bug is closed.

@mbuesch did Fix build: Use the new rust asm! available in rustc 1.63.0-nightly and advised me on releasing avr_delay crate.

[stappersg]

Insteadof crates at https://crates.io are "crates" in git repositories used.

The error cannot find macro llvm_asm in this scope is solved.