Obtaining the CUDA include dir in C++ targets with native-CUDA-support CMake?

问题

In CMake version 3.8, native support for CUDA as a language was introduced. When a project has CUDA as one of its languages, CMake will proceed to locate CUDA (e.g. it locates the nvcc binary).

As long as you only compile CUDA code - this is enough. But what if you want to compile a C++ target in that project? The CUDA includes are not -I'ed automatically, and CMakeCache.txt does not seem to contain the CUDA include path anywhere.

Do I actually have to run something find_package(CUDA 9.0 REQUIRED) even when CMake itself has already located CUDA? Or - can I obtain the include directory some other way?

回答1:

The include directories, which are used by the compiler set by CMAKE_CUDA_COMPILER, can be retrieved from the CMake variable CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES.

For getting the libraries, the best way is probably to use find_library() in combination with CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES.

Example: cmake_minimum_required(VERSION 3.9) project(MyProject VERSION 1.0) enable_language(CUDA)

find_library(CUDART_LIBRARY cudart ${CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES})

add_executable(
    binary_linking_to_cudart 
    my_cpp_file_using_cudart.cpp
)
target_include_directories(
    binary_linking_to_cudart 
    PRIVATE 
    ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}
)
target_link_libraries(
    binary_linking_to_cudart 
    ${CUDART_LIBRARY}
)

This issue is also discussed on the CMake bug tracker: Provide target libraries for cuda libraries.

来源：https://stackoverflow.com/questions/51756562/obtaining-the-cuda-include-dir-in-c-targets-with-native-cuda-support-cmake