Cargo doesn't recognize `build-std`

help
1

Unstable Features - The Cargo Book (rust-lang.org):

If, for example, you want to allow

cargo-features = ["test-dummy-unstable"]

where test-dummy-unstable is unstable, that features would also be disallowed by -Zallow-features=, and allowed with -Zallow-features=test-dummy-unstable.

This means that cargo-features = ["build-std"] should work but it instead it says

error: failed to parse manifest at `C:\Users\hrudk\Documents\coding\DOS in Rust\Cargo.toml`

Caused by:
  unknown cargo feature `build-std`

Did it become stable or did they get rid of it?

2

Hmm, not sure exactly why you can't add build-std to cargo-features, but this might be related to the fact that if you want to use the -Zbuild-std option from your CLI, you also need to specify the --target as well. I assume as of right now you can only specify the build-std feature from the command line.

3

To configure build-std using .cargo/config.toml you did use something like:

[unstable]
build-std = ["core", "compiler_builtins"]
4

I did, it worked for some reason but it didn't always work and it seems like it all of a sudden started working

5

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