C++ 体系结构 x86_64 的未定义符号：我应该使用哪种体系结构？
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Undefined symbols for architecture x86_64: Which architecture should I use?
提问by oskob
I'm trying to do some really simple stuff in C++, but I can't find any information on how to tackle this. Even the book I have just says "Just compile and run the program".
我正在尝试用 C++ 做一些非常简单的事情，但我找不到任何关于如何解决这个问题的信息。甚至我刚刚说的那本书“只需编译并运行程序”。
test.cpp
测试.cpp
#include <iostream>
using namespace std;
int main()
{
cout << "Never fear, C++ is here!";
return 0;
}
The compiler says:
编译器说：
Undefined symbols for architecture x86_64:
"std::cout", referenced from:
_main in ccVfJHGs.o
"std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
_main in ccVfJHGs.o
"std::ios_base::Init::Init()", referenced from:
__static_initialization_and_destruction_0(int, int)in ccVfJHGs.o
"std::ios_base::Init::~Init()", referenced from:
___tcf_0 in ccVfJHGs.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
I tried compiling with flags like -arch i386and -m32but it always says it's the wrong architecture. Which one should I use?
我试图像标志编译-arch i386和-m32，但它总是说，这是错误的架构。我应该使用哪一种？
I'm doing this on a Mac but not using XCode, just gcc.
我在 Mac 上执行此操作，但不使用 XCode，仅使用 gcc。
回答by Some programmer dude
The error isn't that it's the wrong architecture, it's that std::cout(and other symbols) isn't defined.
错误不是它的架构错误，而是std::cout（和其他符号）没有定义。
You should compile and link with g++not gcc, to automatically link with correct C++ libraries.
您应该使用g++not编译和链接gcc，以自动链接到正确的 C++ 库。
回答by moshbear
The error is caused because you're compiling with gcc, which only default-links libc.
You need to compile with g++so that libstdc++is auto-linked in too.
该错误是因为您正在使用 进行编译gcc，而仅使用 default-links libc。您需要编译，g++以便它libstdc++也自动链接。
回答by Muhammed Shibin
Use g++ instead of gcc to link with exact c++ libraries
使用 g++ 而不是 gcc 来链接精确的 c++ 库
