Can't find CUDA_INCLUDE_DIRS in latest CMAKE [duplicate] - cmake

Question

This question already has answers here:
Listing include_directories in CMake
(3 answers)
Closed 3 years ago.
Since in CMAKE 3.10, CUDA macro is supported by default (https://cmake.org/cmake/help/latest/module/FindCUDA.html).
But I can't find the variable CUDA_INCLUDE_DIRS
cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
project(cmake_and_cuda LANGUAGES CXX CUDA)
message(${CUDA_INCLUDE_DIRS})
the errors are
-- The CXX compiler identification is GNU 5.4.0
-- The CUDA compiler identification is NVIDIA 10.0.130
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working CUDA compiler: /usr/local/cuda/bin/nvcc
-- Check for working CUDA compiler: /usr/local/cuda/bin/nvcc -- works
-- Detecting CUDA compiler ABI info
-- Detecting CUDA compiler ABI info - done
CMake Error at CMakeLists.txt:7 (message):
message called with incorrect number of arguments
-- Configuring incomplete, errors occurred!
See also "/home/tumh/code-samples/posts/cmake/build/CMakeFiles/CMakeOutput.log".
Any idea?

Answer 1

Just use the ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}.
In all .cu src files, there is no need to manually add
include_directories(${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES}),
because CMake will do it for you.
But for .cpp src files, if you need to include <cuda_runtime.h>, you must manually add
include_directories(${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES})
in your CMakeLists.txt.