undefined reference problem

[Zheng Huang]

If you use g++ in the final step(i.e. use 'g++ ./*.o -o main.out'
instead), everything's OK. I don't know why gcc prompts such error.

Zheng

btw: you should include Connector.h in your main file, right? Otherwise
it cannot be compiled.

On Tue, 20 Jul 2004, Andre Kirchner wrote:

>Hi,
>I made this simple C++ program, but when I try to
>compile it, gcc returns the followinf error message:
>
>gcc -c Connector.cpp
>gcc -c main.cpp
>gcc  ./*.o -o main.out
>./main.o(.eh_frame+0x11): undefined reference to
>`__gxx_personality_v0'
>collect2: ld returned 1 exit status
>make: *** [main.out] Error 1
>
>What is this undefined reference to
>`__gxx_personality_v0, and how do I fix it?
>The following is the code of main.cpp, Connecot.h and
>Connector.cpp if it may help you to find the problem.
>
>Thanks a lot,
>
>Andre
>
>_________________________________________
>main.cpp:
>
>#ifndef MAIN
>#	define MAIN
>#	include "main.h"
>#endif
>
>int main( int argc, char *argv[] )
>{
>//	char theMessage[ 256 ];
>	Connector theConnector;
>
>
>//	theConnector.connect( "mx1.hotmail.com", 25 );
>//	theConnector.receiveMessage( theMessage, 255 );
>
>//	printf( "%s\n", theMessage );
>
>//	theConnector.disconnect;
>
>
>
>	return ( EXIT_SUCESS );
>}
>_________________________________________
>Connector.h:
>
>#define ERROR -1
>#define SUCCESS 0
>
>#ifndef SOCKET
>#	define SOCKET
>#	include <sys/socket.h>
>#endif
>
>#ifndef NETDB
>#	define NETDB
>#	include <netdb.h>
>#endif
>
>#ifndef STRING
>#	define STRING
>#	include <string.h>
>#endif
>
>#ifndef UNISTD
>#	define UNISTD
>#	include <unistd.h>
>#endif
>
>class Connector
>{
>  public:
>    Connector(){};
>    ~Connector(){};
>    int connect( const char * theMailServerName, int
>thePortNumber );
>    int sendMessage( const char * theMessage );
>    int receiveMessage( char * theMessage, int
>theMessageLength );
>    int disconnect();
>
>  private:
>    int sockfd;
>};
>________________________________________
>Connector.cpp:
>
>#ifndef CONNECTOR
>#	define CONNECTOR
>#	include "Connector.h"
>#endif
>
>int Connector::connect( const char *
>theMailServerName, int thePortNumber )
>{
>	struct sockaddr_in theMailServerAddress;
>	struct hostent * theMailServer;
>
>	sockfd = socket( AF_INET, SOCK_STREAM, 0 );
>	if( sockfd < 0 )
>		return( ERROR );
>
>	theMailServer = gethostbyname( theMailServerName );
>    	if ( theMailServer == NULL )
>		return( ERROR );
>
>	bzero( ( char *) &theMailServerAddress, sizeof(
>theMailServerAddress ) );
>	theMailServerAddress.sin_family = AF_INET;
>	bcopy( ( char *)theMailServer->h_addr, ( char
>*)&theMailServerAddress.sin_addr.s_addr,
>theMailServer->h_length );
>	theMailServerAddress.sin_port = htons( thePortNumber
>);
>
>	return( SUCCESS );
>}
>
>int Connector::sendMessage( const char * theMessage )
>{
>	if( send( sockfd, theMessage, strlen( theMessage ), 0
>) < 0 )
>		return( ERROR );
>
>	return( SUCCESS );
>}
>
>int Connector::receiveMessage( char * theMessage, int
>theMessageLength )
>{
>	if( recv ( sockfd, theMessage, theMessageLength, 0) <
>0 )
>		return( ERROR );
>
>	return( SUCCESS );
>}
>
>int Connector::disconnect()
>{
>	if( close( sockfd ) < 0 )
>		return( ERROR );
>
>	return( SUCCESS );
>}
>
>
>
>
>
>
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