d:/codefield/code_c/c_single/test/hi.cpp:5: undefined reference to std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)' C:\Users\76713\AppData\Local\Temp\ccQUbM56.o: In function__tcf_0':
C:/Program Files/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:74: undefined reference to std::ios_base::Init::~Init()' C:\Users\76713\AppData\Local\Temp\ccQUbM56.o: In function__static_initialization_and_destruction_0':
C:/Program Files/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:74: undefined reference to std::ios_base::Init::Init()' C:\Users\76713\AppData\Local\Temp\ccQUbM56.o:hi.cpp:(.rdata$.refptr._ZSt4cout[.refptr._ZSt4cout]+0x0): undefined reference tostd::cout'
collect2.exe: error: ld returned 1 exit status
代码呢，先用个最简单的cout<<"haha" << endl;代码试试。