奇怪的错误编译调用Surface低级CUDA API的代码

Question

这个最小的例子：

int main() 
{
    struct surfaceReference* surfaceReferencePointer;
    cudaGetSurfaceReference(&surfaceReferencePointer, "surfaceReference"); 
}

在编译时失败：

nvcc -g -arch=sm_20 -o foo.out foo.cu

显示以下错误消息：

foo.cu(4): warning: argument of type "surfaceReference **" is incompatible with parameter of type "const surfaceReference **"
foo.cu(4): warning: argument of type "surfaceReference **" is incompatible with parameter of type "const surfaceReference **"

foo.cu: In function ‘int main()’:
foo.cu:4: error: invalid conversion from ‘surfaceReference**’ to ‘const surfaceReference**’
foo.cu:4: error:   initializing argument 1 of ‘cudaError_t cudaGetSurfaceReference(const surfaceReference**, const char*)’

我无法理解我做错了什么。我正在使用CUDA 3.2在Linux Ubuntu 64位机器上进行编译。

Answer 1

struct surfaceReference*指针应定义为const：

int main() 
{
    const struct surfaceReference* surfaceReferencePointer;
    cudaGetSurfaceReference(&surfaceReferencePointer, "surfaceReference"); 
}

感谢codymanix，他在评论中提供了正确的答案。