Clang ignores open_cl code?

Hello everyone,

I have implemented an AST visitor and everything is working fine. Except from the fact that my visitor ignores lines which have to do
with open_cl for example variable declarations or kernel declarations.
I checked the same source code with clang-check and dumped the AST tree and guess what. Clang-check also ignores these specific lines of code.

Any idea why?

Thank you
Andreas Georgiou