update hip and sycl cmake

Author: mgrabban

bitcracker/HIP/CMakeLists.txt

@@ -38,7 +38,7 @@ set(HIP_LIBRARIES     "${ROCM_PATH}/lib"       ${HIP_LIBRARIES})
 # CMAKE_CXX_FLAGS
 if("${CMAKE_CXX_FLAGS}" STREQUAL "")
     message(STATUS "Using DEFAULT compilation flags for the application")
-    set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} " -O3 -std=c++17 -ffast-math ")
+    set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} " -O3 -std=c++17 -ffast-math -D__HIP_PLATFORM_AMD__ ")
 else()
     message(STATUS "OVERRIDING compilation flags")
 endif()

bitcracker/SYCL/CMakeLists.txt

@@ -67,12 +67,14 @@ elseif(USE_NVIDIA_BACKEND)
         message("-- Building for SM_80 compatibility (DEFAULT)")
         string(APPEND CMAKE_CXX_FLAGS " -fsycl-targets=nvptx64-nvidia-cuda -Xsycl-target-backend --cuda-gpu-arch=sm_80")
     endif()
+    string(APPEND CMAKE_CXX_FLAGS " -DUSE_NVIDIA_BACKEND")
 elseif(USE_AMDHIP_BACKEND)
     message(STATUS "Enabling AMD HIP backend for ${USE_AMDHIP_BACKEND} AMD architecture")
     if(USE_DEFAULT_FLAGS)
         set(CMAKE_CXX_FLAGS "${AMD_GPU_CXX_FLAGS}") # Default flags for AMD backend (gfx908 for MI100)
     endif()
     string(APPEND CMAKE_CXX_FLAGS " -fsycl-targets=amdgcn-amd-amdhsa -Xsycl-target-backend --offload-arch=${USE_AMDHIP_BACKEND} ")
+    string(APPEND CMAKE_CXX_FLAGS " -DUSE_AMDHIP_BACKEND")
 endif()
 
 set(SOURCES