Looks like in XCode and CMake there are issues here.
Created attachment 421272 [details] WIP Patch
Created attachment 421276 [details] WIP Patch Trying to make Mac happy, has some non-unified build fixes with it
Created attachment 421279 [details] WIP Patch
Created attachment 421284 [details] Patch
Committed r273310: <https://commits.webkit.org/r273310> All reviewed patches have been landed. Closing bug and clearing flags on attachment 421284 [details].
<rdar://problem/74644606>