Include-what-you-use is a promising little tool for cleaning up a codebase. It didn’t end up working for the use I had for it, but it still could be useful. Here is a quick guideline on installing it on macOS.
Install to a brew llvm install
First, install the latest LLVM suite using brew (
brew install llvm). You’ll
want to activate this install; I use Lmod
(the files here).
Pay attention to what version you end up getting.
Next, you’ll follow the guidelines on a out-of-source install. Basically, that amounts to:
mkdir IWYU cd IWYU git clone https://github.com/include-what-you-use/include-what-you-use.git cd include-what-you-use git checkout clang_5.0 # Or whatever you got with brew cd .. mkdir build cd build cmake ../include-what-you-use -DCMAKE_INSTALL_PREFIX=$(brew --prefix llvm) -DIWYU_LLVM_ROOT_PATH=$(brew --prefix llvm) make make install
(If you are using fish instead of bash, remove the
Then, to use in another CMake project:
cmake .. -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE=$(which include-what-you-use) make 2> iwyu.out fix_includes.py -n --nosafe_headers --comments < iwyu.ou
-n to actually make the changes)
That’s all there is to it! It, unfortunately, broke the software I was trying to clean up, but the idea is great.