I use Wunused-parameter for my project, but I want to have it ignore 3rd party headers (headers in specific directories). Is there a way I can set this with cmake?
I'm currently setting the compiler options like this:
add_compile_options(-Wall -Wextra -pedantic -Werror -pedantic-errors -Wshadow -Wstrict-aliasing)
Compilers generally ignore warnings in system headers. So, the solution is to designate the directories where the third party headers are searched from as system include directories.
In GCC / Clang, this is achieved by using -isystem instead of -I, In Cmake, this is done by passing the argument SYSTEM to target_include_directories.
However, include dirs of third party libraries are typically added using target_link_libraries instead and unfotunately there is no way to pass SYSTEM through that directly. This can be solved with a little helper function: CMake: target_link_libraries include as SYSTEM to suppress compiler warnings.
