Hello, everyone! I want to know how to use CMake to dynamically link CUDA libraries, I know it seems to require some extra restrictions, but don’t know exactly how to do it. Here is a simple example I wrote to illustrate my problem.
Directory structure:
Dir/
├── CMakeLists.txt
├── header.cuh
├── kernel.cu
└── main.cpp
Environment:
- OS: Windows 11
- GPU: RTX 3060 laptop
- CUDA Toolkit: 11.6
- Platform: Visual Studio 2022
header.cuh:
#include "stdio.h"
#include "cuda_runtime.h"
#include "device_launch_parameters.h"
extern "C" void f();
kernel.cu:
#include "header.cuh"
void __global__ print()
{
int idx = blockIdx.x * blockDim.x + threadIdx.x;
printf("%d\n", idx);
}
void f()
{
print<<<1, 10>>>();
}
main.cpp:
#include "header.cuh"
extern "C" void f();
int main()
{
f();
return 0;
}
CMakeLists.txt:
cmake_minimum_required(VERSION 3.17)
project(test)
set(CMAKE_CXX_STANDARD 17)
find_package(CUDA REQUIRED)
enable_language("CUDA")
set(CMAKE_CUDA_STANDARD 14)
set(CUDA_SEPARABLE_COMPILATION ON)
string(APPEND CMAKE_CUDA_FLAGS " -rdc=true --cudart shared")
add_library(CUDA_COMP SHARED header.cuh kernel.cu)
set_property(TARGET CUDA_COMP PROPERTY CUDA_ARCHITECTURES 86-real 86-virtual)
add_executable(main main.cpp)
target_link_libraries(main CUDA_COMP)
The project can be configured successfully, but a problem with unresolved external symbols occurs when building the solution, as shown in the figure below.
There will be no problem if CUDA_ COMP is changed to a static library and linked, i.e. the word “SHARED” in line 12 of CMakeLists.txt is replaced with “STATIC”.
I also looked up the corresponding solution on Stackoverflow, but it didn’t work. For example, an answer on Stackoverflow mentioned adding " -rdc=true --cudart shared" to cmake, and I did the same (see line 10 of CMakeLists.txt).
This problem has been bothering me for a long time. I hope you can tell me the cause of the problem and how to solve it. Thank you so much!