C++ 对“std::cout”的未定义引用
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undefined reference to 'std::cout'
提问by D1X
Shall this be the example:
难道这就是例子：
#include <iostream>
using namespace std;
int main()
{
cout << "Hola, moondo.\n";
}
It throws the error:
它抛出错误：
gcc -c main.cpp gcc -o edit main.o main.o: In function `main':
main.cpp:(.text+0xa): undefined reference to `std::cout'
main.cpp:(.text+0xf): 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*)'
main.o: In function `__static_initialization_and_destruction_0(int,int)':
main.cpp:(.text+0x3d): undefined reference to `std::ios_base::Init::Init()'
main.cpp:(.text+0x4c): undefined reference to `std::ios_base::Init::~Init()' collect2: error: ld
returned 1 exit status make: *** [qs] Error 1
Also, this example:
另外，这个例子：
#include <iostream>
int main()
{
std::cout<<"Hola, moondo.\n";
}
throws the error:
抛出错误：
gcc -c main.cpp gcc -o edit main.o main.o: In function `main':
main.cpp:(.text+0xa): undefined reference to `std::cout'
main.cpp:(.text+0xf): 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*)'
main.o: In function `__static_initialization_and_destruction_0(int,int)': main.cpp:(.text+0x3d): undefined reference to `std::ios_base::Init::Init()'
main.cpp:(.text+0x4c): undefined reference to `std::ios_base::Init::~Init()' collect2: error: ld
returned 1 exit status make: *** [qs] Error 1
Note: I am using Debian Wheezy.
注意：我使用的是 Debian Wheezy。
回答by shauryachats
Compile the program with:
使用以下命令编译程序：
g++ -Wall -Wextra -Werror -c main.cpp -o main.o
^^^^^^^^^^^^^^^^^^^^ <- For listing all warnings when your code is compiled.
as coutis present in the C++ standard library, which would need explicit linkingwith -lstdc++when using gcc; g++links the standard library by default.
正如coutC++ 标准库中存在的那样，在使用时需要显式链接; 默认链接标准库。-lstdc++gccg++
With gcc, (g++should be preferred over gcc)
与gcc, (g++应该优先于gcc)
gcc main.cpp -lstdc++ -o main.o
回答by A B
Yes, using g++command worked for me:
是的，使用g++命令对我有用：
g++ my_source_code.cpp
回答by iggy12345
Makefiles
生成文件
If you're working with a makefile and you ended up here like me, then this is probably what you're looking or:
如果您正在使用 makefile 并且像我一样最终到达这里，那么这可能就是您要查找的内容或：
If you're using a makefile, then you need to change ccas shown below
如果您使用的是makefile，则需要进行cc如下更改
my_executable : main.o
cc -o my_executable main.o
to
到
CC = g++
my_executable : main.o
$(CC) -o my_executable main.o
