Hi, We needed in our project (https://github.com/KhronosGroup/webcl-validator) to be able to define callbacks for handling OpenCL extension pragmas to catch easily which OpenCL extensions are enabled/disabled.
I attached the patch file and test case for the functionality. Rami Ylimäki is actually author of the implementation I just wrote the test case and cleaned up the patch for upstreaming. I had to add clangParse and clangSema libraries to PPCallbacksTest compilation, because enabling OpenCL support for preprocessor required Parser instance. Parser instance actually reads LangOptions from preprocessor and registers correct pragma handlers to preprocessor. Any comments, improvements? Cheers, Mikael Lepistö
clang_opencl_extension_pragma_callbacks.diff
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