I'm using the current stable Intel OpenCL SDK, which is 1.2 compliant, but I ran into a problem compiling my code because Intel's cl_ext.h header file is not identical to the Khronos' cl_ext.h header file (https://www.khronos.org/registry/cl/api/1.2/cl_ext.h). Specifically, the macro definitions under cl_khr_spir are missing. Please do not ship headers for a version of OpenCL that remove something from the Khronos' corresponding header (adding more is fine as long as there are no conflicts). Thanks!
We seemed to have added those macros back in the latest internal version. So expect the updated header in the next update. Thanks for bringing this to our attention.