CUDA compilation issue with CMake

Question

I am having issues with compiling my CUDA code with CMake. I am using CUDA 7 and the version information from nvcc is as follows:

nvcc: NVIDIA (R) Cuda compiler          


        

Answer 1

This worked for me using CUDA 7, gcc 4.8.2 and CMake 3.0.2.

I updated the code and added a simple thrust-based example to make it clear that you can use C++11 in CUDA code

CMakeLists.txt

project(cpp11)
find_package(CUDA)
list(APPEND CUDA_NVCC_FLAGS "-arch=sm_20;-std=c++11;-O2;-DVERBOSE")
SET(CUDA_PROPAGATE_HOST_FLAGS OFF)
CUDA_ADD_EXECUTABLE(cpp11 main.cpp test.h test.cu)

test.h

#ifndef TEST_H
#define TEST_H
int run();
#endif

test.cu

#include "test.h"
#include <thrust/device_vector.h>
#include <thrust/reduce.h>
#include <thrust/sequence.h>

template<typename T>
struct Fun
{
        __device__ T operator()(T t1, T t2)
        {
            auto result = t1+t2;
            return result;
        }
};

int run()
{
    const int N = 100;
    thrust::device_vector<int> vec(N);
    thrust::sequence(vec.begin(),vec.end());
    auto op = Fun<int>();
    return thrust::reduce(vec.begin(),vec.end(),0,op);
}

main.cpp

#include <iostream>
#include "test.h"

int main()
{
    std::cout << run() << std::endl;
    return 0;
}

Answer 2

If stumbling across this question while searching for a way to compile Genoils CPP-Ethereum build for Ethereum CUDA mining, my problem was solved by editing the CMakeLists.txt file in the cpp-ethereum/libethash-cuda folder.

Where it states:

set(CUDA_NVCC_FLAGS
${CUDA_NVCC_FLAGS};
-gencode etc etc)

add "-std=c++11" after the semi-colon, as follows:

set(CUDA_NVCC_FLAGS 
${CUDA_NVCC_FLAGS};
-std=c++11
-gencode etc etc) 

Answer 3

list(APPEND CUDA_NVCC_FLAGS "-std=c++11") is enough,SET(CUDA_PROPAGATE_HOST_FLAGS OFF) may be not necessary, and it cause me could not set breakpoint in .cu file