[split]The reason GCC doesn't work for us

[pd]

Just adding a very short but precise description of the problem:

Different compilers generate virtual tables and their access differently, there is no standard defined that all compilers follow.
The GCC way to generate them is not compatible to the way MSVC does it and it cannot be altered.

We need 100% binary compability, which GCC cannot grant, because the game was compiled using MSVC.