CMake sub-project errors

[godronus]

Trying to build a project using StarlingMonkey as a sub-project. Any helpful hints would be appreciated. ( Cmake is not my goto tool )

I was able to build and modify StarlingMonkey fine as a cloned repo, however I keep getting build errors as a sub-project.

clang: error: invalid thread model 'single' in '-mthread-model single' for this target

I have created a repo with a slimmed down build setup and a Dockerfile that depicts the errors.