GCC 4.5.2链接器在使用异常(c++)时遇到问题

GCC 4.5.2 Linker gots Problem while using Exceptions (C++)

本文关键字：c++ 异常 问题 遇到 链接 GCC      更新时间：2023-10-16

我试着写一个web服务器。就我而言，它在Windows上运行得非常好。但我想让它也兼容Unix。我认为异常类的遗传一定有问题。为了更好地理解，只需要重要的部分:

server.cpp 

#include <exception>
#include <stdexcept>
#ifdef __unix__
    #include "UnixSocket.h"
#elif __WIN32__ || _MSC_VER
    #include "WinSocket.h"
#endif
#include "HTTPParser.h"
int main(void) {
    try {
        socket->socketInit(PORT);
    }
    catch (exception &e) {
        cout << endl << "Exception: " << e.what() << endl;
        socket->cleanAll();
    }
return 0
}

NetInterface.h 

class NetInterface : public exception {
private:
public:
    virtual void socketInit(const char *port) = 0;
    virtual void cleanAll(void) = 0;
    virtual void cleanPersCon(void) = 0;
    virtual char *akzeptieren(void) = 0;
    virtual void empfangen(void) = 0;
    virtual void senden(void) = 0;
    virtual void *get_in_addr(struct sockaddr *sa) = 0;
    virtual string getIncoming(void) = 0;
    virtual void setOutcoming(string s) = 0;
    virtual ~NetInterface() throw() {};

};

UnixSocket.h 

class UnixSocket : virtual public NetInterface { 
private: 
    [...]
public:
    UnixSocket(void);
//kill socket connections
    void cleanAll(void);
    void cleanPersCon(void);
//SysCalls
    void socketInit(const char *port);
    char *akzeptieren(void);
    void empfangen(void);
    void senden(void);
//Getter and Setter
    string getIncoming(void);
    void setOutcoming(string s);
    virtual ~UnixSocket() throw() {};
};

HTTPParser.h 

class HTTPParser : public exception {
private:
    [...]
public:
    HTTPParser(NetInterface *_socket, string _path);
    void parsePacket(void);
    virtual ~HTTPParser() throw() {};
};
在

中可以看到类声明的简短摘要。但是现在gcc告诉我这样的东西:

/tmp/cc8DNmKI.o:(.rodata._ZTV10HTTPParser[vtable for HTTPParser]+0x10): undefined reference to `std::exception::what() const'
/tmp/cc8DNmKI.o:(.rodata._ZTV10UnixSocket[vtable for UnixSocket]+0x14): undefined reference to `std::exception::what() const'
/tmp/cc8DNmKI.o:(.rodata._ZTV10UnixSocket[vtable for UnixSocket]+0x78): undefined reference to `std::exception::what() const'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x10): undefined reference to `std::exception::what() const'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x14): undefined reference to `__cxa_pure_virtual'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x18): undefined reference to `__cxa_pure_virtual'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x1c): undefined reference to `__cxa_pure_virtual'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x20): undefined reference to `__cxa_pure_virtual'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x24): undefined reference to `__cxa_pure_virtual'
/tmp/cc8DNmKI.o:(.rodata._ZTV12NetInterface[vtable for NetInterface]+0x28): more undefined references to `__cxa_pure_virtual' follow
/tmp/cc8DNmKI.o:(.rodata._ZTVSt16invalid_argument[vtable for std::invalid_argument]+0x10): undefined reference to `std::logic_error::what() const'
/tmp/cc8DNmKI.o:(.rodata._ZTVSt12domain_error[vtable for std::domain_error]+0x10): undefined reference to `std::logic_error::what() const'
/tmp/cc8DNmKI.o:(.rodata._ZTI10HTTPParser[typeinfo for HTTPParser]+0x0): undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/tmp/cc8DNmKI.o:(.rodata._ZTI10HTTPParser[typeinfo for HTTPParser]+0x8): undefined reference to `typeinfo for std::exception'
/tmp/cc8DNmKI.o:(.rodata._ZTI10UnixSocket[typeinfo for UnixSocket]+0x0): undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
/tmp/cc8DNmKI.o:(.rodata._ZTI10UnixSocket[typeinfo for UnixSocket]+0x18): undefined reference to `typeinfo for std::exception'
/tmp/cc8DNmKI.o:(.rodata._ZTI12NetInterface[typeinfo for NetInterface]+0x0): undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/tmp/cc8DNmKI.o:(.rodata._ZTI12NetInterface[typeinfo for NetInterface]+0x8): undefined reference to `typeinfo for std::exception'
/tmp/cc8DNmKI.o:(.rodata._ZTISt16invalid_argument[typeinfo for std::invalid_argument]+0x0): undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/tmp/cc8DNmKI.o:(.rodata._ZTISt16invalid_argument[typeinfo for std::invalid_argument]+0x8): undefined reference to `typeinfo for std::logic_error'
/tmp/cc8DNmKI.o:(.rodata._ZTISt12domain_error[typeinfo for std::domain_error]+0x0): undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/tmp/cc8DNmKI.o:(.rodata._ZTISt12domain_error[typeinfo for std::domain_error]+0x8): undefined reference to `typeinfo for std::logic_error'
/tmp/cc8DNmKI.o:(.eh_frame+0xeb): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

甚至更多....

从undefined reference to __gxx_personality_v0链接器消息来看，您似乎正在与gcc链接。您需要将c++应用程序与g++链接。或者与gcc链接，并将-lstdc++添加到链接器命令行。

您没有显示相关代码和编译器调用，但知道std::exception有一个未实现的虚拟成员函数what()，您希望覆盖它，所以如果您想调用what()，请不要抛出裸std::exception。

<stdexcept>中的任何派生的特定异常都将实现what()，并允许您在构造异常对象时存储消息。

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