gcc未定义引用`std :: ios_base :: Init :: Init（）' [英] gcc undefined reference to `std::ios_base::Init::Init()'

问题描述

编写boost测试安装是否成功演示

Write a boost test whether the installation was successful demo

#include<iostream>
#include<boost/lexical_cast.hpp>
int main(){
    int a = boost::lexical_cast<int>("123456");
    std::cout << a <<std::endl;
    return 0;
}

编译错误

test.cpp:(.text+0x24): undefined reference to `std::cout'
test.cpp:(.text+0x29): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(int)'
test.cpp:(.text+0x31): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
test.cpp:(.text+0x39): undefined reference to `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> >&))'
/tmp/ccG8Wb2k.o: In function `__static_initialization_and_destruction_0(int, int)':
test.cpp:(.text+0x61): undefined reference to `std::ios_base::Init::Init()'
test.cpp:(.text+0x66): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccG8Wb2k.o: In function `std::exception::exception()':

推荐答案

如果使用 gcc 而不是 g ++ ，C ++库不会自动链接。这是来自 man g ++ ：

If you use gcc instead of g++, the C++ library is not automatically linked. This is from man g++:

但是，使用gcc不会添加C ++库。 g ++是一个
程序，它调用GCC并自动指定与
C ++库的链接。它将.c，.h和.i文件视为C ++源文件
，而不是C源文件，除非使用-x。这个程序也是
有用的预编译的C头文件扩展名为.h，在C ++编译中使用
。在许多系统上，g ++也安装了
名称c ++。

However, the use of gcc does not add the C++ library. g++ is a program that calls GCC and automatically specifies linking against the C++ library. It treats .c, .h and .i files as C++ source files instead of C source files unless -x is used. This program is also useful when precompiling a C header file with a .h extension for use in C++ compilations. On many systems, g++ is also installed with the name c++.

正如其他人所说，使用 g ++ 或在调用结束时链接 -lstdc ++ 。像 gcc main.cpp -lstdc ++ 。

As others have stated, either use g++ directly or link -lstdc++ at the end of your invocation. Something like gcc main.cpp -lstdc++.

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