How to use the tool include-what-you-use together with CMake to detect unused headers?

Question

The tool include-what-you-use can be used to detect unneeded headers. I am using CMake for my C++ software project. How can I instruct CMake to run include-what-you-use auto

Answer 1

You can also enable it globally outside the cmake script by setting the cmake variable:

cmake -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE="iwyu"  

It will then call it on each CXX target.