Input C/C++ Header // /this is the comment # define ABC ' 1 ' Bindgen Invocation <div class="highlight highlight-source-rust notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="let bindings = bindgen::Builder::default() .header(format!("src/test.cpp")) .layout_tests(false) .clang_arg("-fparse-all-comments") .clang_args(&["-E", "-CC"]) .generate_comments(true) .parse_callbacks(Box::new(bindgen::CargoCallbacks)) .generate() .expect("Unable to generate bindings");"> let bindings = bindgen :: Builder :: default ( ) . header ( format ! ( "src/test.cpp" ) ) . layout_tests ( false ) . clang_arg ( "-fparse-all-comments" ) . clang_args ( & [ "-E" , "-CC" ] ) . generate_comments ( true ) . parse_callbacks ( Box :: new ( bindgen :: CargoCallbacks ) ) . generate ( ) . expect ( "Unable to generate bindings" ) ; The comment line is missing. How can I keep it ?

Unfortunately there's no solution for this right now. There are some ongoing efforts to improve macro processing but even then it is unclear if those efforts would fix this.

comments for macros is lost · rust-lang rust-bindgen