Today I learnt that certain rust code can be marked such that it is compiled only for specific platform.

This makes sense for low level libraries that provide platform-specific functionality that is not available on other platforms.

This is achieved by tagging the function with #[cfg(target_os = "xyz")]

Here xyz can be one of the following :

• “windows”
• “macos”
• “ios”
• “linux”
• “android”
• “freebsd”
• “dragonfly”
• “openbsd”
• “netbsd”

Similar to target_os, here are other options :

• target_feature
• target_arch
• target_family
• target_env
• target_abi
• target_endian
• target_vendor
• target_pointer_width
• target_has_atomic

Some Most of these are obvious. For others which are not, read the :Rust documentation for the details.