未定义对std :: ios_base :: Init :: Init()的引用 [英] undefined reference to std::ios_base::Init::Init()

问题描述

我正在使用C ++学习OOP并遇到问题.我确定这是一个内存分配问题，但似乎无法解决.任何帮助将不胜感激.

I'm working on learning OOP with C++ and having a problem. I'm sure its a memory allocation problem but cant seem to get my head around it. Any help will be greatly appreciated.

我的客户代码

    #include <iostream>
    #include "Box.cpp"

    using namespace std;

    int main(){
        Box *box = new Box;
        return 0;
    }

我的盒子课...

    #include <iostream>

    using namespace std;

    class Box{

        private:
            double width;
            double height;
            double perimeter;
            double area;


        public:
            Box(){
                cout << "Box created" << endl;
            }

            ~Box(){
                cout << "Box Destroyed" << endl;
            }

            double getWidth(){
                //
                return this->width;
            }

            double getHeight(){
                //
                return this->height;
            }

            double getArea(){
                //
                return this->area;
            }

            double getPerimeter(){
                //
                return this->perimeter;
            }

            void setWidth(double w){
                //
                this->width = w;
                if(!this->height){
                    computeSetArea(this->width, this->height);
                    computeSetPerimeter(this->width, this->height);
                }
            }

            void setHeight(double h){
                //
                this->height = h;
                if(!this->width){
                    computeSetArea(this->width, this->height);
                    computeSetPerimeter(this->width, this->height);
                }
            }

        private:
            void computeSetArea(double w, double h){
                //
                this->area = w*h;
            }

            void computeSetPerimeter(double w, double h){
                //
                this->perimeter = (w * 2) + (h + 2);
            }
    };

我使用gcc并执行:

    gcc Box.cpp client.cpp -o mainfile

这样我会收到此错误.

/tmp/ccaVb21k.o: In function `__static_initialization_and_destruction_0(int, int)':
Box.cpp:(.text+0x1d): undefined reference to `std::ios_base::Init::Init()'
Box.cpp:(.text+0x22): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccaVb21k.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
/tmp/ccjtbzi4.o: In function `main':
client.cpp:(.text+0x14): undefined reference to `operator new(unsigned int)'
client.cpp:(.text+0x3f): undefined reference to `operator delete(void*)'
/tmp/ccjtbzi4.o: In function `__static_initialization_and_destruction_0(int, int)':
client.cpp:(.text+0x6c): undefined reference to `std::ios_base::Init::Init()'
client.cpp:(.text+0x71): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccjtbzi4.o: In function `Box::Box()':
client.cpp:(.text._ZN3BoxC1Ev[Box::Box()]+0x11): undefined reference to `std::cout'
client.cpp:(.text._ZN3BoxC1Ev[Box::Box()]+0x16): 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*)'
client.cpp:(.text._ZN3BoxC1Ev[Box::Box()]+0x1e): 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> >&)'
client.cpp:(.text._ZN3BoxC1Ev[Box::Box()]+0x26): 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/ccjtbzi4.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
/tmp/ccjtbzi4.o:(.eh_frame+0x4b): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

推荐答案

您的代码可以正常编译，出现链接器错误( ld 是链接器，并且返回1(错误))，它抱怨缺少c ++库.

Your code compiles fine, you're getting a linker error (ld is the linker, and it's returning 1 (error)), which is complaining about missing c++ libs.

要解决此问题，您需要将stdc ++ lib添加到命令行中，或使用g ++.

To fix, you'll need to add the stdc++ lib to your commandline, or use g++.

用 g ++ 替换 gcc 或在您的gcc命令行中添加 -lstdc ++ .

Replace gcc with g++ or add -lstdc++ to your gcc command line.

gcc Box.cpp client.cpp -o mainfile -lstdc ++

或

g ++ Box.cpp client.cpp -o mainfile

这会将std c ++库与您的已编译代码链接.使用 g ++ ，您可以省略此步骤.

This will link the std c++ library with your compiled code. Using g++, you can omit this step.

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