could not load config key env.AVR_CPU_FREQUENCY_HZ

[stappersg]

Since #40

stappers@myhost:~/src/rust/RustAVR/blink
$ cargo version
cargo 1.63.0-nightly (38472bc19 2022-05-31)
stappers@myhost:~/src/rust/RustAVR/blink
$ cargo build
error: error in /home/stappers/src/rust/RustAVR/blink/.cargo/config.toml: could not load config key `env.AVR_CPU_FREQUENCY_HZ`

Caused by:
  data did not match any variant of untagged enum EnvConfigValueInner
stappers@myhost:~/src/rust/RustAVR/blink
$ 

[stappersg]

According https://doc.rust-lang.org/nightly/cargo/reference/config.html#env should it work.

Does it work for you? (So that I know it is just me)

[chinoto]

Same problem, same version. If I comment it out, I get an error compiling.

❯ cargo build
   Compiling core v0.0.0 (/home/damian/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
warning: target json file contains unused fields: no-compiler-rt

   Compiling rustc-std-workspace-core v1.99.0 (/home/damian/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
error: ran out of registers during register allocation

   Compiling compiler_builtins v0.1.73
warning: `rustc-std-workspace-core` (lib) generated 1 warning (1 duplicate)
warning: `core` (lib) generated 1 warning
error: could not compile `core` due to previous error; 1 warning emitted
warning: build failed, waiting for other jobs to finish...
warning: `compiler_builtins` (lib) generated 1 warning (1 duplicate)

core compiles if I use release mode (maybe that has always been required?), but then avr_delay complains that llvm_asm macro and feature doesn't exist, which sort of makes sense since there has been talk of deprecating it, though shouldn't it still exist for quite awhile?

[stappersg]

Thank you @chinoto, there are now these commits

• Commented out setting AVR_CPU_FREQUENCY_HZ env var
• Removed no-compiler-rt field from avr-atmega328p

Compiling with and without ``--release` makes indeed a difference:

stappers@myhost:~/src/rust/RustAVR/blink
$ cargo build
   Compiling proc-macro2 v1.0.24
   Compiling unicode-xid v0.2.1
   Compiling compiler_builtins v0.1.73
   Compiling syn v1.0.60
   Compiling core v0.0.0 (/home/stappers/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling json v0.12.4
   Compiling xml-rs v0.8.3
   Compiling lazy_static v1.4.0
   Compiling target-cpu-fetch v0.1.3
   Compiling xmltree v0.10.2
   Compiling target-cpu-macro v0.1.3
   Compiling avr-mcu v0.3.5
   Compiling quote v1.0.8
   Compiling ruduino v0.3.2
   Compiling const_env_impl--value v0.1.2
   Compiling const_env--value v0.1.2
   Compiling rustc-std-workspace-core v1.99.0 (/home/stappers/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
error: ran out of registers during register allocation

error: could not compile `core` due to previous error
warning: build failed, waiting for other jobs to finish...
stappers@myhost:~/src/rust/RustAVR/blink
$ cargo build --release
   Compiling proc-macro2 v1.0.24
   Compiling unicode-xid v0.2.1
   Compiling compiler_builtins v0.1.73
   Compiling syn v1.0.60
   Compiling core v0.0.0 (/home/stappers/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling json v0.12.4
   Compiling xml-rs v0.8.3
   Compiling lazy_static v1.4.0
   Compiling target-cpu-fetch v0.1.3
   Compiling xmltree v0.10.2
   Compiling target-cpu-macro v0.1.3
   Compiling avr-mcu v0.3.5
   Compiling quote v1.0.8
   Compiling ruduino v0.3.2
   Compiling const_env_impl--value v0.1.2
   Compiling const_env--value v0.1.2
   Compiling rustc-std-workspace-core v1.99.0 (/home/stappers/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling avr-config v1.0.0
   Compiling avr-std-stub v1.0.2
   Compiling avr-config v2.0.1
   Compiling avr_delay v0.3.1
error: cannot find macro `llvm_asm` in this scope
  --> /home/stappers/.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
  --> /home/stappers/.cargo/registry/src/github.com-1ecc6299db9ec823/avr_delay-0.3.1/src/lib.rs:41:13
   |
41 |     unsafe {llvm_asm!("1: sbiw $0,1
   |             ^^^^^^^^

error[E0635]: unknown feature `llvm_asm`
 --> /home/stappers/.cargo/registry/src/github.com-1ecc6299db9ec823/avr_delay-0.3.1/src/lib.rs:1:12
  |
1 | #![feature(llvm_asm)]
  |            ^^^^^^^^

For more information about this error, try `rustc --explain E0635`.
error: could not compile `avr_delay` due to 3 previous errors
warning: build failed, waiting for other jobs to finish...
stappers@myhost:~/src/rust/RustAVR/blink
$

This issue is now left open as reminder to revert commit 6276e6a.

Work can continue when avr-rust/delay#21 and avr-rust/delay#19 have been solved. (yes, help is appricated)

[rockboynton]

Adding quotes around the value seemed to fix the issue

[env]
AVR_CPU_FREQUENCY_HZ = "16000000"