GPU HIP CMake: Remove workaround to build HIP kernels in separate CMake directory, now that we can compile them using HIP language

Author: davidrohr

GPU/GPUTracking/Base/hip/CMakeLists.txt

@@ -207,9 +207,8 @@ endif()
 if(GPUCA_HIP_COMPILE_MODE STREQUAL "onefile")
   target_compile_definitions(${targetName} PRIVATE GPUCA_KERNEL_COMPILE_MODE=0)
 elseif(GPUCA_HIP_COMPILE_MODE STREQUAL "perkernel")
-  #add_library(GPUTrackingHIPKernels OBJECT $<JOIN:$<LIST:TRANSFORM,$<LIST:TRANSFORM,$<LIST:TRANSFORM,$<TARGET_PROPERTY:O2_GPU_KERNELS,O2_GPU_KERNEL_NAMES>,REPLACE,[^A-Za-z0-9]+,_>,PREPEND,${O2_GPU_KERNEL_WRAPPER_FOLDER}/krnl_>,APPEND,.cu>, >)
-  #set_property(TARGET GPUTrackingHIPKernels PROPERTY HIP_FATBIN_COMPILATION ON)
-  add_subdirectory(per_kernel)
+  add_library(GPUTrackingHIPKernels OBJECT $<JOIN:$<LIST:TRANSFORM,$<LIST:TRANSFORM,$<LIST:TRANSFORM,$<TARGET_PROPERTY:O2_GPU_KERNELS,O2_GPU_KERNEL_NAMES>,REPLACE,[^A-Za-z0-9]+,_>,PREPEND,${O2_GPU_KERNEL_WRAPPER_FOLDER}/krnl_>,APPEND,.hip>, >)
+  target_compile_options(GPUTrackingHIPKernels PRIVATE "--cuda-device-only")
   target_compile_options(GPUTrackingHIPKernels PRIVATE $<$<COMPILE_LANGUAGE:HIP>:-fno-gpu-rdc>)
   target_link_options(GPUTrackingHIPKernels PRIVATE $<$<COMPILE_LANGUAGE:HIP>:-fno-gpu-rdc>)
   target_compile_definitions(${targetName} PRIVATE GPUCA_KERNEL_COMPILE_MODE=1)