Building binaries only for specific OS targets

Hey. Apologies if this has been answered already, but I keep finding the question online, but not the answer.

Is it possible to set up Cargo rules to only build binaries or examples if the target is a specific OS or set of Operating Systems?

I tried variations of this with no luck:

name = "my-linux-util"
required-features = ["utils"]
target_os = ["linux", "android"]

No, it's not possible. Only dependencies can be platform-specific.

If you already have a Linux-only crate, then Cargo's natural solution is just not try to build it on other platforms.

If you want to be thorough, you can use cfg(not(linux)) and compile_error! to break compilation early on other platforms. Or wrap everything in cfg(linux) and make it compile to nothing on other platforms.

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