Integrating NvIFROpenGL with UnrealEngine, clang++

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HI,

I’m having trouble integrating NvIFROpenGL within the UnrealEngine. I can make the samples and other trivial examples work.

I always get a crash calling NvIFR.nvIFROGLCreateSession(&SessionHandle, NULL).

The first suspicion is compiling with clang++. give the warning

warning:
empty struct has size 0 in C, size 1 in C++

I can ignore the warning or add a byte to the structs (to force them to be sizeof(1)), but neither method prevents the crash.

I am confident I am running within a valid gl context, with a complete framebuffer, I can take screenshots from this point in the render thread using glreadpixels.

Any ideas as to how I can find the cause of this problem?