Rust library for detecting OS bitness independently of the executable's bitness. Windows, GNU/Linux and FreeBSD currently supported.
let bitness = bitness::os_bitness().unwrap();
match bitness {
Bitness::X86_32 => println!("We're 32-bit!"),
Bitness::X86_64 => println!("We're 64-bit!"),
_ => { }
}