How to check in Rust if architecture is 32 or 64 b

问题:

If there a conditional check for whether processor is 32-bit or 64-bit? I'm looking for kind of configuration check like e.g. #cfg[x86] or cfg[x64].

回答1:

The #[cfg(target_pointer_width = "64")] from the cfg section in the Rust reference seems like a likely solution. It is based on the size of a pointer (as well as isize and usize), which should correspond to the architecture.

回答2:

You should check the Rust Reference chapter on conditional compilation:

target_arch = "..." - Target CPU architecture, such as "x86", "x86_64", "mips", "powerpc", "powerpc64", "arm", or "aarch64". This value is closely related to the first element of the platform target triple, though it is not identical.