Using Cuda Object Linking with Cmake

Question

Right now I am working on a project that uses the object linking capabilities of Cuda 5. Since the project is starting to get complex, I wanted to switch to using cmake to compile the code. However I can't seem to get object linking to work correctly for me.

I ended up creating a toy version of the project which gets the same kind of errors as the original project. The toy project consists of a main file (TextureMain.cu) that calls a kernel function to run on the GPU. In each GPU thread an instance of a user-defined class (TextureFunc) is referenced, where the class exists in a separate folder from the main file. The class consists of a TextureFunc.cu and TextureFunc.h file in that folder.

Here are the CMakeList.txt files I am using:

In the project directory (contains src directory):

project(TextureMain)
cmake_minimum_required(VERSION 2.8)
find_package(CUDA REQUIRED)
#-------------------------------------------------------------------------------
set(CUDA_NVCC_FLAGS "-arch=compute_20; -code=sm_20; -rdc=true; -lcudadevrt")
include_directories(src/TextureFunc)
#-------------------------------------------------------------------------------
add_subdirectory(src/TextureFunc)
add_subdirectory(src)

In the src directory (contains TextureMain.cu and TextureFunc directory):

cuda_add_executable(TextureMain TextureMain.cu)
target_link_libraries(TextureMain TextureFunc)
install(TARGETS TextureMain DESTINATION bin)

In TextureFunc directory (contains TextureFunc.h and TextureFunc.cu):

cuda_add_library(TextureFunc TextureFunc.cu )
target_link_libraries(TextureFunc)

When I try to compile this code using the above CMakeList.txt files, I get the following error.

Linking CXX executable TextureMain
CMakeFiles/TextureMain.dir/./TextureMain_generated_TextureMain.cu.o: In function `__sti____cudaRegisterAll_46_tmpxft_00004c15_00000000_6_TextureMain_cpp1_ii_texRef':
/tmp/tmpxft_00004c15_00000000-3_TextureMain.cudafe1.stub.c:2: undefined reference to `__cudaRegisterLinkedBinary_46_tmpxft_00004c15_00000000_6_TextureMain_cpp1_ii_texRef'
TextureFunc/libTextureFunc.a(TextureFunc_generated_TextureFunc.cu.o): In function `__sti____cudaRegisterAll_46_tmpxft_00004bd8_00000000_6_TextureFunc_cpp1_ii_421ca072':
/tmp/tmpxft_00004bd8_00000000-3_TextureFunc.cudafe1.stub.c:8: undefined reference to `__cudaRegisterLinkedBinary_46_tmpxft_00004bd8_00000000_6_TextureFunc_cpp1_ii_421ca072'
collect2: ld returned 1 exit status
make[2]: *** [src/TextureMain] Error 1
make[1]: *** [src/CMakeFiles/TextureMain.dir/all] Error 2

This is obviously a linking error, and it probably has to do with the way that I compile the code using cmake. I think the flags for nvcc are right since I was able to compile this project using a Makefile with the same flags. However, I'm not really sure what else I could be doing wrong. I did notice that the error message references some non-existent .cpp files, but I don't know what to do with that.

Any advice that can be given would be greatly appreciated. I'm using cmake version 2.8.8.

Answer 1

How about linking${CUDA_LIBRARIES} to whatever targets using `.cu files?

For example in your src directory you could try:

cuda_add_executable(TextureMain TextureMain.cu)
target_link_libraries(TextureMain TextureFunc ${CUDA_LIBRARIES})
install(TARGETS TextureMain DESTINATION bin)