when:
        def unused = file("app/src/main/headers/ignore1.h") << "broken!"

        file("app/src/main/headers/defs.h") << """
            #define _HELLO_HEADER_2 "hello.h"
            #define _HELLO_HEADER_1 _HELLO_HEADER_2
            #define HELLO_HEADER MACRO_FUNCTION() // some indirection

            #define MACRO_FUNCTION( ) _HELLO_HEADER_1
            #define FUNCTION_RETURNS_STRING(X) "hello.h"