Runtime type, RTTI /GR does not seem to work with 4.9.2?

Although I wish I did not need it, I do need RTTI as I have to integrate with third party libraries that expect caller to have it. The line:

bUseRTTI = true; 

Used to cause the unreal build system to put a /GR on the command line. But looking through the .obj files, I no longer see this command line option (I used to see this with previous versions of Unreal), which means I am going to have stack problems.

Would appreciate some clarification, this is essential for us. We don’t have a choice about using these libraries.