MAC OS X 10.8上的gcc 4.8抛出“架构x86_64的未定义符号： [英] gcc 4.8 on MAC OS X 10.8 throws "Undefined symbols for architecture x86_64: "

问题描述

我在我的mac os x 10.8中编写了这样的代码，当我使用gcc use_new.cpp -o use_new进行编译时，它会抛出如下错误消息：

 架构x86_64的未定义符号：
std :: basic_ostream< char，std :: char_traits< char>> :: operator<< （std :: basic_ostream< char，std :: char_traits< char>&（*）（std :: basic_ostream< char，std :: char_traits< char>&）），引用自：
 _main in ccr2vrRQ.o 
std :: basic_ostream< char，std :: char_traits< char>> :: operator<（void const *），引用自：
 _main in ccr2vrRQ.o 
std :: basic_ostream< char，std :: char_traits< char>> :: operator<（double），引用自：
 _main in ccr2vrRQ.o 
std :: basic_ostream< char，std :: char_traits< char>> :: operator<（int），引用自：
 _main in ccr2vrRQ.o 
std :: basic_ostream< ; char，std :: char_traits  _main in ccr2vrRQ.o 
std :: ios_base :: Init :: Init（），引用自：$ b在ccr2vrRQ.o中$ b__static_initialization_and_destruction_0（int，int）
std :: ios_base :: Init ::〜Init（），引用自：
 b $ bstd :: cout，引用自：
 _main in ccr2vrRQ.o 
std :: basic_ostream< char，std :: char_traits< char> >&安培; std :: endl< char，std :: char_traits< char> >（std :: basic_ostream< char，std :: char_traits< char>&&），引用自：
 _main in ccr2vrRQ.o 
std :: basic_ostream< char，std： ：char_traits<炭> >&安培;的std ::运营商LT;< <的std :: char_traits<炭> >（std :: basic_ostream< char，std :: char_traits< char>&; char const *），引用自：
 _main in ccr2vrRQ.o 
operator delete（void * ），引用自：
 _main in ccr2vrRQ.o 
operator new（unsigned long），引用来自：
 _main in ccr2vrRQ.o 
 ld：symbol（s）未找到架构x86_64 
 collect2：错误：ld返回1退出状态
  

当我使用g ++ use_new.cpp -o use_new是好的，谁可以帮助我！？谢谢！

  #include< iostream> 
 struct fish 
 {
 float weight; 
 int id; 
 int kind; 
}; 
 int main（）
 {
 using namespace std; 
 int * pt = new int; 
 * pt = 1001; 
 cout<<int：<<< pt< <in location：<< pt<< endl; 
 double * pd = new double; 
 * pd = 100000001.0; 
 cout<<double：<<< pd<<"在位置："<< pd<< endl; 
 cout<<int point pt is length<< sizeof（* pt）<< endl; 
 cout<<<<<<<<<<<<<<<<<<<<<<<<<< 
 delete pt; 
删除pd; 
 cout<<（int *）你好吗？<< endl; 
返回0; 
} 
  

解决方案

旧的4.2 GCC（我在设置我的非官方iOS工具链时遇到过这个问题）。 gcc 默认为C，并调用链接器而不链接到C ++标准库;相比之下， g ++ 默认使用C ++并且链接到C ++标准库。总而言之 - 可能的解决方案：

  gcc myprog.c -o myprog -lstdc ++ 
  

或

  g ++ myprog.c -o myprog 
  

all,I write a code like this in my mac os x 10.8,and when I use "gcc use_new.cpp -o use_new " to compile it,but it throws wrong message like this:

Undefined symbols for architecture x86_64:
  "std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from:
      _main in ccr2vrRQ.o
  "std::basic_ostream<char, std::char_traits<char> >::operator<<(void const*)", referenced from:
      _main in ccr2vrRQ.o
  "std::basic_ostream<char, std::char_traits<char> >::operator<<(double)", referenced from:
      _main in ccr2vrRQ.o
  "std::basic_ostream<char, std::char_traits<char> >::operator<<(int)", referenced from:
      _main in ccr2vrRQ.o
  "std::basic_ostream<char, std::char_traits<char> >::operator<<(unsigned long)", referenced from:
      _main in ccr2vrRQ.o
  "std::ios_base::Init::Init()", referenced from:
      __static_initialization_and_destruction_0(int, int) in ccr2vrRQ.o
  "std::ios_base::Init::~Init()", referenced from:
      __static_initialization_and_destruction_0(int, int) in ccr2vrRQ.o
  "std::cout", referenced from:
      _main in ccr2vrRQ.o
  "std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from:
      _main in ccr2vrRQ.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 ccr2vrRQ.o
  "operator delete(void*)", referenced from:
      _main in ccr2vrRQ.o
  "operator new(unsigned long)", referenced from:
      _main in ccr2vrRQ.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

and when I use "g++ use_new.cpp -o use_new" is OK,who can help me!? thank you!

#include <iostream>      
    struct fish              
    {
        float weight;
        int id;
        int kind;              
    };
    int main()               
    {
      using namespace std;   
      int* pt = new int;     
      *pt = 1001;            
      cout<<"int: "<<*pt<<"in location: "<<pt<<endl;
      double* pd = new double;
      *pd = 100000001.0;     
      cout<<"double: "<<*pd<<"in location: "<<pd<<endl;
      cout<<"int point pt is length "<<sizeof(*pt)<<endl;
      cout<<"double point pd is length "<<sizeof(*pd)<<endl;
      delete pt;             
      delete pd;             
      cout<<(int *)"How are you!"<<endl;
      return 0;
  }

解决方案

This is the case even with the old 4.2 GCC (I experienced this when I set up my unofficial iOS toolchain). gcc assumes C by default, and invokes the linker without linking to the C++ standard library; in contrast, g++ assumes C++ and links against the C++ standard library by default.

All in all - possible solutions:

gcc myprog.c -o myprog -lstdc++

or

g++ myprog.c -o myprog

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