I'm trying to use CUDA with Qt Creator, Win7, and VS2012 compiler. I have experience with Qt on Windows, but have been unsuccessful setting up to integrate CUDA code into a Qt project. I've tried several posted solutions (such as Compiling Cuda code in Qt Creator on Windows), but have had no success. I finally decided to simplify and base my code on this blog post: https://cudaspace.wordpress.com/2012/07/05/qt-creator-cuda-linux-review/ but am still having issues.
Currently, I get the error "LNK1104: cannot open file 'obj\cuda_code.obj'"
My .pro file is:
QT += core
QT -= gui
TARGET = QtCuda
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp \
cuda_code.cu
# project build directories
DESTDIR = $$PWD
OBJECTS_DIR = $$DESTDIR/obj
# C++ flags
QMAKE_CXXFLAGS_RELEASE =-O3
# Cuda sources
CUDA_SOURCES += cuda_code.cu
# Path to cuda toolkit install
CUDA_DIR = "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.0"
# Path to header and libs files
INCLUDEPATH += $$CUDA_DIR/include
QMAKE_LIBDIR += $$CUDA_DIR/lib/x64
# libs used in your code
LIBS += -lcudart -lcuda
# GPU architecture
CUDA_ARCH = sm_50
# Here are some NVCC flags I've always used by default.
NVCCFLAGS = --compiler-options -use_fast_math
# Prepare the extra compiler configuration (taken from the nvidia forum - i'm not an expert in this part)
CUDA_INC = $$join(INCLUDEPATH,' -I','-I',' ')
cuda.commands = $$CUDA_DIR/bin/nvcc -m64 -O3 -arch=$$CUDA_ARCH -c $$NVCCFLAGS \
$$CUDA_INC $$LIBS ${QMAKE_FILE_NAME} -o ${QMAKE_FILE_OUT} \
2>&1 | sed -r \"s/\\(([0-9]+)\\)/:\\1/g\" 1>&2
cuda.dependency_type = TYPE_C
cuda.depend_command = $$CUDA_DIR/bin/nvcc -O3 -M $$CUDA_INC $$NVCCFLAGS ${QMAKE_FILE_NAME}
cuda.input = $$CUDA_SOURCES
cuda.output = $$OBJECTS_DIR/${QMAKE_FILE_BASE}_cuda.obj
# Tell Qt that we want add more stuff to the Makefile
QMAKE_EXTRA_COMPILERS += cuda
My main.cpp
#include <QtCore/QCoreApplication>
#include <iostream>
using namespace std;
#include <cuda_runtime.h>
extern "C"
cudaError_t cuda_main();
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
cudaError_t cuerr = cuda_main();
if (cuerr != cudaSuccess) cout << "CUDA Error: " << cudaGetErrorString( cuerr ) << endl;
return a.exec();
}
My cuda file (cuda_code.cu):
#include <thrust/host_vector.h>
#include <thrust/device_vector.h>
#include <thrust/sort.h>
extern "C"
cudaError_t cuda_main()
{
// generate 16M random numbers on the host
thrust::host_vector<int> h_vec(1 << 24);
thrust::generate(h_vec.begin(), h_vec.end(), rand);
// transfer data to the device
thrust::device_vector<int> d_vec = h_vec;
// sort data on the device (805 Mkeys/sec on GeForce GTX 480)
thrust::sort(d_vec.begin(), d_vec.end());
// transfer data back to host
thrust::copy(d_vec.begin(), d_vec.end(), h_vec.begin());
return cudaGetLastError();
}
