[Mingw-users] problem about linking ws2_32

[bang b. <she...@gm...>]

Hi, everyone:
       I am very sorry to trouble you, but I need your help for my question
about linking  ws2_32 library. I use many function about network in my
programm, but when linking them, some functions are undefined reference,
and some are ok. The following is an example:

/* example.c */
#include <windows.h>
#include <winsock2.h>
#include <winsock.h>
#include <ws2tcpip.h>
#include <stdio.h>

#define DEFAULT_PORT "27105"

int main(int argc, char* argv[]) {
        int iresult;
        struct addrinfo* result = NULL, *ptr = NULL, hints;
        char szPath[128] = "";

        ZeroMemory(&hints, sizeof(hints));
        hints.ai_family = AF_INET;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_protocol = IPPROTO_TCP;
        hints.ai_flags = AI_PASSIVE;

        iresult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);

        gethostname(szPath, sizeof(szPath));

        printf("hello wolrd\n");

        return 0;
}

 gcc example.c -o example.exe -L/mingw/bin -lws2_32             (I copied
the ws2_32.dll to mingw/bin)

ERROR:
C:/DOCUME~1/tsinghua/LOCALS~1/Temp/cc6OKmlS.o:a.c:(.text+0xb1): undefined
reference to `gethostname@8'
collect2: ld returned 1 exit status

NOTE:
I have used tool to look the function symbols in ws2_32 and it has
"gethostname", and if the ws2_32 library is not found, "getaddrinfo"
function will be not found, but it found the function, why?
Thank you very much!!!



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-- 
ADDRESS:清华大学FIT楼4-308
TEL： 156-1166-2737