我正在开发我的第一个CUDA程序，在使用nvcc编译器编译时遇到了错误，但如果我使用g++编译则不会出现这些错误。
我的代码:
#include <iostream>
#include <cmath>
using namespace std;
double distance(double first, double second);
int main(){
double dis;
dis = distance(7.0, 1.0);
cout << "distance = " << dis << endl;
return 0;
}
double distance(double first, double second){
double diff;
diff = abs(first-second);
return diff;
}
如果我使用
nvcc test.cu -o test编译，结果如下：/usr/include/c++/5/bits/stl_iterator_base_types.h(168): error: name followed by "::" must be a class or namespace name
detected during instantiation of class "std::iterator_traits<_Iterator> [with _Iterator=double]"
test.cu(11): here
/usr/include/c++/5/bits/stl_iterator_base_types.h(169): error: name followed by "::" must be a class or namespace name
detected during instantiation of class "std::iterator_traits<_Iterator> [with _Iterator=double]"
test.cu(11): here
/usr/include/c++/5/bits/stl_iterator_base_types.h(170): error: name followed by "::" must be a class or namespace name
detected during instantiation of class "std::iterator_traits<_Iterator> [with _Iterator=double]"
test.cu(11): here
/usr/include/c++/5/bits/stl_iterator_base_types.h(171): error: name followed by "::" must be a class or namespace name
detected during instantiation of class "std::iterator_traits<_Iterator> [with _Iterator=double]"
test.cu(11): here
/usr/include/c++/5/bits/stl_iterator_base_types.h(172): error: name followed by "::" must be a class or namespace name
detected during instantiation of class "std::iterator_traits<_Iterator> [with _Iterator=double]"
test.cu(11): here
当我将文件扩展名更改为.cpp并按如下方式编译：
g++ test.cpp -o test，代码编译成功。如果然后执行./test，我将获得我要寻找的结果。distance = 6
看了这篇帖子后，我开始考虑可能是从主机 / 设备分界线的错误一侧调用了某些内容，但是目前我还没有进行任何GPU调用。
不确定发生了什么，但到目前为止，CUDA编译器似乎非常挑剔。
std::distance，而你自己的distance函数似乎正在发生冲突... - Aconcaguadist(...)解决了问题。 - HMLDudeusing namespace std;。如果你认为写std::cout太麻烦，那么可以使用using std::cout;。此外，你还可以将自己的函数放在自己的命名空间中。 - Aconcaguausing声明。 - Aconcagua