Building rocThrust applications on different backends

Applications that use the rocThrust libraries can be built for different backends.

rocThrust supports CPP, OpenMP, and TBB on HOST and device, and NVIDIA CUDA on device only.

The THRUST_HOST_SYSTEM, _THRUST_HOST_SYSTEM_NAMESPACE, THRUST_DEVICE_SYSTEM, and _THRUST_DEVICE_SYSTEM_NAMESPACE build options specify the backend to use.

	CPP	OpenMP	TBB	CUDA
THRUST_HOST_SYSTEM	1	2	3	not supported
_THRUST_HOST_SYSTEM_NAMESPACE	cpp	omp	tbb	not supported
THRUST_DEVICE_SYSTEM	4	2	3	1
_THRUST_DEVICE_SYSTEM_NAMESPACE	cpp	omp	tbb	cuda

If THRUST_HOST_SYSTEM and _THRUST_HOST_SYSTEM_NAMESPACE are omitted, the application will be built for the HOST CPP backend.

If THRUST_DEVICE_SYSTEM and _THRUST_DEVICE_SYSTEM_NAMESPACE are omitted, the application will be built for the device CUDA backend.

To build the application, create the build directory under the same directory as your source code and CMakeLists file, and change directory to build:

mkdir build
cd build

Run cmake with the appropriate build options for your backend:

CXX=hipcc  [-DTHRUST_HOST_SYSTEM={1|2|3}
             -D__THRUST_HOST_SYSTEM_NAMESPACE={cpp|omp|tbb}]
             [-DTHRUST_HOST_SYSTEM={1|2|3|4}
             -D__THRUST_HOST_SYSTEM_NAMESPACE={cuda|omp|tbb|cpp}]

Then run make to build.