Put this in your build.rs to use the C pre-processor with Rust.

fn main() {
 walk_dir("src")
}

This will pre-process any .cpprs source files in src/ using the system C compiler.

See the lzo-macros example.

The C pre-processor will discard any lines beginning with #, so that e.g.

#[macro_use]

would be thrown away.