Set CXX-standard to c++17 when combining C++ and CUDA in CMakeLists

Question

According to the documentation of CMake I just have to write

project(${PROJECT_NAME} LANGUAGES CUDA CXX)

when I would like to combine CUDA-fil

Answer 1

Based on the comment from @talonmies I found a solution for that problem by setting the variables explicitly for each language, i.e. CUDA and CXX:

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CUDA_STANDARD 14)
set(CMAKE_CUDA_STANDARD_REQUIRED TRUE)
set(CMAKE_CXX_STANDARD_REQUIRED TRUE)

Now the pure C++-files are compiled according to C++17, and the CUDA-files are compiled according to C++14.