CMake: how to add cuda to existing project - cuda

Question

I have a project that builds a library and I want to add some cuda support to it.
The structure is:
|Basedir
|_subdir1
|_subdir2
The basic structure of the CMakeLists.txt files: (subdir2 is not important).
in Basedir:
cmake_minimum_required(VERSION 2.6)
PROJECT(myproject)
find_package(CUDA)
INCLUDE_DIRECTORIES(${MYPROJECT_SOURCE_DIR})
ADD_SUBDIRECTORY(subdir1)
ADD_SUBDIRECTORY(subdir2)
in subdir1:
ADD_LIBRARY(mylib shared
file1.cpp
file2.cpp
file3.cpp
)
INSTALL(
TARGETS mylib
DESTINATION lib
PERMISSIONS
OWNER_READ OWNER_WRITE OWNER_EXECUTE
GROUP_READ GROUP_EXECUTE
WORLD_READ WORLD_EXECUTE
)
FILE(GLOB_RECURSE HEADERS RELATIVE ${MYPROJECT_SOURCE_DIR}/myproject *.h)
FOREACH(HEADER ${HEADERS})
STRING(REGEX MATCH "(.*)[/\\]" DIR ${HEADER})
INSTALL(FILES ${HEADER} DESTINATION include/myproject/${DIR})
ENDFOREACH(HEADER)
I actually don't really know how to put the cuda-support into it. I want to replace file2.cpp with file2.cu and I did that, but it didn't build the .cu file, only the cpp files.
Do I have to add CUDA_ADD_EXECUTABLE() to include any cuda-files? How will I then link it to the other files?
I tried adding the following to the CMakeLists.txt in subdir1:
CUDA_ADD_EXECUTABLE(cuda file2.cu OPTIONS -arch sm_20)
That will compile the file but build an executable cuda. How do I link it to mylib?
Just with?:
TARGET_LINK_LIBRARIES(cuda mylib)
I have to admit that I'm not experienced in cmake, but I guess you figured that.

Answer 1

You can use CUDA_ADD_LIBRARY for mylib project. It works as CUDA_ADD_EXECUTABLE but for libraries.
CUDA_ADD_LIBRARY(mylib SHARED
file1.cpp
file2.cu
file3.cpp
OPTIONS -arch sm_20
)
TARGET_LINK_LIBRARIES(mylib ${CUDA_LIBRARIES})