Embarcadero released an inline patch of 12.2 a few weeks ago. Now we have made available an additional patch, available via the GetIt package manager as a quick fix. For Delphi, the patch adds the MacOS RTL library source code, that was accidentally missing in 12.2 Patch 1 (while it was available in the original 12.2).
For C++, the fix addresses a couple of more significant issues with compiler and projects management.
More information, including the full readme, at https://blogs.embarcadero.com/rad-studio-12-2-athens-patch-2-available/