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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].
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It's both. Once you install rustup , you can switch between 32 and 64 bit with rustup defaut … and platform from this list, such as i686-pc-windows-msvc or x86_64-pc-windows-msvc (or equivalent for Linux, Mac, etc.
x86 is the name of the architecture that it's built to run on (the name comes from a series of old Intel processors, the names of which all ended in 86, The first of which was the 8086). Although x86 was originally a 16-bit architecture, the version in use today is the 32-bit extension.
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.
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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.
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