cuda.cmake

# cmake 3.17 decouples C++ and CUDA standards, see https://gitlab.kitware.com/cmake/cmake/issues/19123
# cmake 3.18 knows that CUDA 11 provides cuda_std_17
cmake_minimum_required(VERSION 3.18.0)
set(CMAKE_CUDA_STANDARD 20)
set(CMAKE_CUDA_EXTENSIONS OFF)
set(CMAKE_CUDA_STANDARD_REQUIRED ON)
set(CMAKE_CUDA_SEPARABLE_COMPILATION ON)
# N.B. need relaxed constexpr for std::complex
# see https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#constexpr-functions%5B/url%5D:
if (DEFINED CMAKE_CUDA_FLAGS)
  set(CMAKE_CUDA_FLAGS "--expt-relaxed-constexpr ${CMAKE_CUDA_FLAGS}")
else()
  set(CMAKE_CUDA_FLAGS "--expt-relaxed-constexpr")
endif()
# if CMAKE_CUDA_HOST_COMPILER not set, set it to CMAKE_CXX_COMPILER, else NVCC will grab something from PATH
if (NOT DEFINED CMAKE_CUDA_HOST_COMPILER)
  set(CMAKE_CUDA_HOST_COMPILER "${CMAKE_CXX_COMPILER}" CACHE STRING "The host C++ compiler to be used by the CUDA compiler")
endif()

enable_language(CUDA)

set(CUDA_FOUND TRUE)
set(TILEDARRAY_HAS_CUDA 1 CACHE BOOL "Whether TiledArray has CUDA support")

# find CUDA toolkit
# NB CUDAToolkit does NOT have COMPONENTS
find_package(CUDAToolkit REQUIRED)

foreach (library cublas;nvtx3)
  if (NOT TARGET CUDA::${library})
    message(FATAL_ERROR "CUDA::${library} not found")
  endif()
endforeach()

if (NOT DEFINED CUDAToolkit_ROOT)
  get_filename_component(CUDAToolkit_ROOT "${CUDAToolkit_LIBRARY_DIR}/../" ABSOLUTE CACHE)
endif(NOT DEFINED CUDAToolkit_ROOT)

# sanitize implicit dirs if CUDA host compiler != C++ compiler
message(STATUS "CMAKE Implicit Include Directories: ${CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES}")
message(STATUS "CMAKE Implicit Link Directories: ${CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES}")
include(SanitizeCUDAImplicitDirectories)
sanitize_cuda_implicit_directories()
message(STATUS "CMAKE Implicit Include Directories: ${CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES}")
message(STATUS "CMAKE Implicit Link Directories: ${CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES}")

##
## LibreTT
##
include(external/librett.cmake)