Windows process argument length limit?

In my CMake-based Windows app build, I am all of a sudden running into what seems to be a process argument length limit. The build worked fine previously. I am doing some refactoring work that added a few new files. The error I am getting is ninja: fatal: CreateProcess: The parameter is incorrect. (is the command line too long?) Full terminal output (line-wrapped to make it easier to read): E:\sandbox\ktraunmueller\compositor\Sources\Win\Compositor-Win>cmake --build --preset debug [59/150] ...