Slow CMake builds due to repeated file regeneration on MacOS

[vinh-truong-sc]

Hi, I have included SPIRV-Tools into my project as a dependency with FetchContent. I configure and build my project with these commands:

cmake -G Xcode -B build -S . -DCMAKE_BUILD_TYPE=Release
cmake --build build --config Release --target my_project | xcpretty

This is fine, but repeated runs of cmake --build build ... keep regenerating files in SPIRV-Tools, which causes major rebuilds every time:

This command doesn't seem to have any issues on Windows, and building my project inside Xcode works fine 🤔.

[s-perron]

If you find the issue let us know, you can open a PR. We will consider it.

It seems like this might be related to how you handle spirv-headers in your project. Those files get rebuilt when spirv-headers change. I'm not sure why the build thinks they have been updated. I'm also not positioned to look into it myself.