https://git.yoctoproject.org/cgit/cgit.cgi/meta-intel/tree/dynamic-layers/clang-layer/recipes-opencl/igc/files/link-to-LLVMGenXIntrinsics.patch

--- IGC/VectorCompiler/CMakeLists.txt.orig	2021-07-18 10:00:28 UTC
+++ IGC/VectorCompiler/CMakeLists.txt
@@ -44,6 +44,8 @@ endif()
 
 # --- VC Intrinsics ---
 
+find_package(LLVMGenXIntrinsics)
+if(NOT LLVMGenXIntrinsics_FOUND)
 if(DEFINED VC_INTRINSICS_SRC)
   set(INTRSRC "${VC_INTRINSICS_SRC}/GenXIntrinsics")
 endif()
@@ -58,6 +61,7 @@ set(BUILD_EXTERNAL YES)
 # We are using prebuilt SPIRV and building intrinsics.
 set(INTRBUILD "${CMAKE_CURRENT_BINARY_DIR}/intrbuild")
 add_subdirectory(${INTRSRC} ${INTRBUILD} EXCLUDE_FROM_ALL)
+endif(NOT LLVMGenXIntrinsics_FOUND)
 
 include(cmake/spirv.cmake)