Hi,
I am new to Cuda programming and I am trying to create a static library in ‘Release’ configuration in order to use it from Unreal Engine C++ scripts. I am using Cuda 11.6 and Visual Studio 2019 on windows 10.
Following this blog post I split the default Cuda template kernel.cu into cuda_ue.cu and cuda_ue.h.
cuda_ue.h
#include <string>
#include <stdio.h>
#include "cuda_runtime.h"
#include "device_launch_parameters.h"
cudaError_t addWithCuda(int* c, const int* a, const int* b, unsigned int size, std::string* error_message);
cuda_ue.cu
#include "cuda_ue.h"
__global__ void addKernel(int *c, const int *a, const int *b)
{
int i = threadIdx.x;
c[i] = a[i] + b[i];
}
cudaError_t addWithCuda(int* c, const int* a, const int* b, unsigned int size, std::string* error_message)
{
int* dev_a = 0;
int* dev_b = 0;
int* dev_c = 0;
cudaError_t cuda_status;
// Choose which GPU to run on, change this on a multi-GPU system.
cuda_status = cudaSetDevice(0);
if (cuda_status != cudaSuccess) {
*error_message = "cudaSetDevice failed! Do you have a CUDA-capable GPU installed?";
goto Error;
}
// Allocate GPU buffers for three vectors (two input, one output) .
cuda_status = cudaMalloc((void**)&dev_c, size * sizeof(int));
if (cuda_status != cudaSuccess) {
*error_message = "cudaMalloc failed!";
goto Error;
}
cuda_status = cudaMalloc((void**)&dev_a, size * sizeof(int));
if (cuda_status != cudaSuccess) {
*error_message = "cudaMalloc failed!";
goto Error;
}
cuda_status = cudaMalloc((void**)&dev_b, size * sizeof(int));
if (cuda_status != cudaSuccess) {
*error_message = "cudaMalloc failed!";
goto Error;
}
// Copy input vectors from host memory to GPU buffers.
cuda_status = cudaMemcpy(dev_a, a, size * sizeof(int), cudaMemcpyHostToDevice);
if (cuda_status != cudaSuccess) {
*error_message = "cudaMemcpy failed!";
goto Error;
}
cuda_status = cudaMemcpy(dev_b, b, size * sizeof(int), cudaMemcpyHostToDevice);
if (cuda_status != cudaSuccess) {
*error_message = "cudaMemcpy failed!";
goto Error;
}
// Launch a kernel on the GPU with one thread for each element.
addKernel << <1, size >> > (dev_c, dev_a, dev_b);
// Check for any errors launching the kernel
cuda_status = cudaGetLastError();
if (cuda_status != cudaSuccess) {
*error_message = "addKernel launch failed: " + std::string(cudaGetErrorString(cuda_status));
goto Error;
}
// cudaDeviceSynchronize waits for the kernel to finish, and returns
// any errors encountered during the launch.
cuda_status = cudaDeviceSynchronize();
if (cuda_status != cudaSuccess) {
*error_message = "cudaDeviceSynchronize returned error code " + std::to_string(cuda_status) + " after launching addKernel!";
goto Error;
}
// Copy output vector from GPU buffer to host memory.
cuda_status = cudaMemcpy(c, dev_c, size * sizeof(int), cudaMemcpyDeviceToHost);
if (cuda_status != cudaSuccess) {
*error_message = "cudaMemcpy failed!";
goto Error;
}
Error:
cudaFree(dev_c);
cudaFree(dev_a);
cudaFree(dev_b);
return cuda_status;
}
I changed Debug to Release and Configuration type in Project properties into ‘Static library’. On clicking ‘Build’ following error is coming:
Severity Code Description Project File Line Suppression State
Error MSB3721 The command ""C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\bin\nvcc.exe" -gencode=arch=compute_52,code=\"sm_52,compute_52\" --use-local-env -ccbin "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX86\x64" -x cu -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" -I"C:\vcpkg\installed\x64-windows\include" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" --keep-dir x64\Release -maxrregcount=0 --machine 64 --compile -cudart static -DWIN32 -DWIN64 -DNDEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /O2 /Fd"C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\x64\Release\cuda_ue_vs.pdb" /FS /MD " -o x64\Release\cuda_ue.cu.obj "C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\cuda_ue.cu"" exited with code 1. cuda_ue_vs C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\BuildCustomizations\CUDA 11.6.targets 790
Output window with verbosity level ‘Normal’ is:
Build started...
1>------ Build started: Project: cuda_ue_vs, Configuration: Release x64 ------
1>Build started 2/9/2022 5:24:40 AM.
1>Target InitializeBuildStatus:
1> Touching "x64\Release\cuda_ue_vs.tlog\unsuccessfulbuild".
1>Target CudaBuild:
1> Target CudaBuildCore:
1> Compiling CUDA source file cuda_ue.cu...
1>
1> C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs>"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\bin\nvcc.exe" -gencode=arch=compute_52,code=\"sm_52,compute_52\" --use-local-env -ccbin "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX86\x64" -x cu -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" -I"C:\vcpkg\installed\x64-windows\include" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" --keep-dir x64\Release -maxrregcount=0 --machine 64 --compile -cudart static -DWIN32 -DWIN64 -DNDEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /O2 /Fd"C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\x64\Release\cuda_ue_vs.pdb" /FS /MD " -o x64\Release\cuda_ue.cu.obj "C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\cuda_ue.cu"
1> nvcc fatal : A single input file is required for a non-link phase when an outputfile is specified
1> C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\BuildCustomizations\CUDA 11.6.targets(790,9): error MSB3721: The command ""C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\bin\nvcc.exe" -gencode=arch=compute_52,code=\"sm_52,compute_52\" --use-local-env -ccbin "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX86\x64" -x cu -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" -I"C:\vcpkg\installed\x64-windows\include" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" --keep-dir x64\Release -maxrregcount=0 --machine 64 --compile -cudart static -DWIN32 -DWIN64 -DNDEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /O2 /Fd"C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\x64\Release\cuda_ue_vs.pdb" /FS /MD " -o x64\Release\cuda_ue.cu.obj "C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\cuda_ue.cu"" exited with code 1.
1> Done building target "CudaBuildCore" in project "cuda_ue_vs.vcxproj" -- FAILED.
1>
1> Done building project "cuda_ue_vs.vcxproj" -- FAILED.
1>
1>Build FAILED.
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\BuildCustomizations\CUDA 11.6.targets(790,9): error MSB3721: The command ""C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\bin\nvcc.exe" -gencode=arch=compute_52,code=\"sm_52,compute_52\" --use-local-env -ccbin "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\HostX86\x64" -x cu -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" -I"C:\vcpkg\installed\x64-windows\include" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.6\include" --keep-dir x64\Release -maxrregcount=0 --machine 64 --compile -cudart static -DWIN32 -DWIN64 -DNDEBUG -D_CONSOLE -D_MBCS -Xcompiler "/EHsc /W3 /nologo /O2 /Fd"C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\x64\Release\cuda_ue_vs.pdb" /FS /MD " -o x64\Release\cuda_ue.cu.obj "C:\Users\htic\Documents\Unreal Projects\cuda_ue_vs\cuda_ue.cu"" exited with code 1.
1> 0 Warning(s)
1> 1 Error(s)
1>
1>Time Elapsed 00:00:00.65
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========