makefiles/cargo: Remove CARGO_CHANNEL and other simplifications #20319
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Contribution description
The Rust makefiles contain some stuff that is needlessly complex and was necessary due to earlier Rust versions that have long been unsupported. This cleans them up; see individual commits for details.
Testing procedure
Apart from CI, I tested:
in examples/rust-hello-world:
make BOARD=microbit-v2 CARGO_PROFILE=dev
, with profile values also usingtest
andbench
because they are special cases to Cargo;rm -rf bin
inbetween to see it's not tapping into old existing files. To testCARGO_PROFILE=foo
, add this to Cargo.toml:Any of the examples can still just be built, but you can also
rustup override set beta
in the directory of an example and run it there; you'll see everything recompiling because a different compiler is now used, andmake info-rust
shows the beta version (beware this persists, sorustup override remove
later)[toolchain]
/channel = "nightly"
into rust-toolchain.toml to have a locally visible override.