enable cc70,cc72,cc75 for half_precision, add message for omp missing on macOS

CMakeLists.txt

@@ -54,7 +54,6 @@ if(CMAKE_CUDA_COMPILER AND ENABLE_CUDA)
   set(CUDA_ARCHITECTURES "Auto" CACHE STRING "\"Auto\" detects local machine GPU compute arch at runtime, \"Common\" and \"All\" cover common and entire subsets of architectures, \"Names\" is a list of architectures to enable by name, \"Numbers\" is a list of compute capabilities (version number) to enable")
   set_property(CACHE CUDA_ARCHITECTURES PROPERTY STRINGS "Auto" "Common" "All" "Kepler Maxwell Kepler+Tegra Maxwell+Tegra Pascal" "3.0 7.5")
   enable_language(CUDA)
-  find_package(CUDAToolkit REQUIRED)
   if(CMAKE_CUDA_COMPILER_VERSION VERSION_LESS "9.0")
     message(STATUS "Unsupported CUDA version, please upgrade to CUDA 9+. Disabling CUDA support")
     set(ENABLE_CUDA "FALSE" CACHE BOOL "Enable CUDA support" FORCE)
@@ -62,7 +61,7 @@ if(CMAKE_CUDA_COMPILER AND ENABLE_CUDA)
     find_package(CUDA REQUIRED)
     cuda_select_nvcc_arch_flags(CUDA_ARCH_FLAGS ${CUDA_ARCHITECTURES})
     message(STATUS "Building with CUDA flags: " "${CUDA_ARCH_FLAGS}")
-    if (NOT "arch=compute_70,code=sm_70" IN_LIST CUDA_ARCH_FLAGS)
+    if (NOT "arch=compute_70,code=sm_70" IN_LIST CUDA_ARCH_FLAGS AND NOT "arch=compute_72,code=sm_72" IN_LIST CUDA_ARCH_FLAGS AND NOT "arch=compute_75,code=sm_75" IN_LIST CUDA_ARCH_FLAGS)
       set(ENABLE_CUDNN_HALF "FALSE" CACHE BOOL "Enable CUDNN Half precision" FORCE)
       message(STATUS "Your setup does not supports half precision (it requires CC >= 7.5)")
     endif()
@@ -125,6 +124,10 @@ endif()
 find_package(Stb REQUIRED)
 find_package(OpenMP)
 
+if(APPLE AND NOT OPENMP_FOUND)
+  message(STATUS "  ->  To enable OpenMP on macOS, please install libomp from Homebrew")
+endif()
+
 set(ADDITIONAL_CXX_FLAGS "-Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -Wno-deprecated-declarations -Wno-write-strings")
 set(ADDITIONAL_C_FLAGS "-Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -Wno-deprecated-declarations -Wno-write-strings")