How do I detect unused macro definitions & typedefs?

Question

It's easy to get a list unused functions and variables with linker feedback, but how can I detect those unused macro definitions & typedefs? Do I have to browse the code line by line and git grep in the whole project?

Answer 1

For macros defined in source files you might try -Wunused-macros gcc/clang flag. There's also -Wunused-local-typedefs in gcc.