Enable parallel jobs for hip-clang build

[ROCm/rccl commit: 3f471ab5b1]

projects/rccl/CMakeLists.txt

@@ -164,6 +164,12 @@ if("${HIP_COMPILER}" MATCHES "clang")
   endforeach()
   target_link_libraries(rccl PRIVATE -fgpu-rdc)
   target_include_directories(rccl PRIVATE /opt/rocm/hsa/include)
+  find_program( hipcc_executable hipcc )
+  execute_process(COMMAND bash "-c" "${hipcc_executable} -help | grep 'parallel-jobs'" OUTPUT_VARIABLE hipcc_parallel_jobs)
+  if("${hipcc_parallel_jobs}" MATCHES "parallel-jobs")
+    target_compile_options(rccl PRIVATE -parallel-jobs=4 PRIVATE -Wno-format-nonliteral)
+    target_link_libraries(rccl PRIVATE -parallel-jobs=4)
+  endif()
 endif()
 
 if("${HIP_COMPILER}" MATCHES "hcc")