Can Embarcaderos Clang backend link to libraries built with a corresponding standalone clang toolchain?

Trying to compile any third party using Embarcaderos CMake "supported" toolchain fails almost for any library of any significance. I have tried the Poco and VTK libraries.

Question is: Is it feasible to compile these libraries using a standalone Clang compiler (same version as the one that Embarcaderos is built on top of), and link the resulting libraries with Embarcaderos tools?