Rustc ability similar to `gcc -Dxxx=yyy`

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Does rust has the ability to check some definitions which is passed in by compiler (similar to gcc -Dxxx=yyy)?

In C++ I checked the endianness of the target platform (by using CMake) and pass this information to my program (by using #ifdef), I wondered if I can do the same in rust?

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You can do this with #[cfg], but you don't need CMake; Rust directly provides the target_endian cfg option.

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