Conditionalize an entire crate by OS?

How can I tell cargo not to build an entire crate except on certain operating systems? The usual answer "just don't do that" doesn't apply, because this crate is part of a workspace and the rest of the workspace should be built on all operating systems. I want to use commands like cargo build --all in CI, rather than running cargo build separately for each crate. Ideally, I'd like to put something like this in the workspace's Cargo.toml file:

members = ['foo', 'bar', 'baz']
members = ['foo', 'bar']

Has anybody else encountered this problem before? How did you fix it?

You can put a #![cfg(unix)] on top of the src/ file for the baz crate.
That way it's effectively empty for everything but unix platforms.

This is what winapi does. See here. Just compile an empty crate on other platforms.

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