The normative cl_khr_icd specification is now in the OpenCL
Extension Specification and is no longer authored in plain
text.

Please refer to the OpenCL Extension Specification on the
OpenCL Registry:

https://www.khronos.org/registry/OpenCL/

The Asciidoc source for this extension may be found here:

https://github.com/KhronosGroup/OpenCL-Docs/blob/master/ext/cl_khr_icd.asciidoc