It's always possible to use the C preprocessor on non-C files, I saw people do it in Java and I heard it's somewhat common in C#; it's also used by various Unix

It's always possible to use the C preprocessor on non-C files, I saw people do it in Java and I heard it's somewhat common in C#; it's also used by various Unix utilities (X11 for Xrdb for instance). So technically every language can have C macros :-)