c - implicit declaration of function 'getaddrinfo' on Windows with Mingw -


i'm trying create basic client application, based on code on msdn error in title. here complete code:

#include <tchar.h> #include <stdio.h> #include <string.h> #include <stdarg.h>  #include <windows.h> #include <winsock2.h> #include <ws2tcpip.h> #pragma comment (lib, "ws2_32.lib") #define debug 1   #define default_buflen 512 #define default_port "9001"  void createsocket(); int main(int argc, char* argv[]) {     createsocket();       return 0; }   void createsocket() {     wsadata wsadata;     socket connectsocket = invalid_socket;     struct addrinfo *result = null,                     *ptr = null,                     hints;     char *sendbuf = "this test";     int iresult;      // initialize winsock     iresult = wsastartup(makeword(2,2), &wsadata);      zeromemory( &hints, sizeof(hints) );          hints.ai_family = af_unspec;     hints.ai_socktype = sock_stream;     hints.ai_protocol = ipproto_tcp;      iresult = getaddrinfo("127.0.0.1", default_port, &hints, &result);     connectsocket = socket(ptr->ai_family, ptr->ai_socktype,              ptr->ai_protocol);      iresult = connect( connectsocket, ptr->ai_addr, (int)ptr->ai_addrlen);      freeaddrinfo(result);     iresult = send( connectsocket, sendbuf, (int)strlen(sendbuf), 0 );      closesocket(connectsocket);     wsacleanup();  }

i'm on windows 10, mingw. complete compile , error:

gcc -wall -o "test" "test.c" -lws2_32 (nel direttorio: c:\users\federicoponzi\google drive\programmazione\c\programmazionedisistema\federicoponzi-programmazionedisistema-40c332bcd001\federicoponzi-programmazionedisistema-40c332bcd001\prove) test.c:10:0: warning: ignoring #pragma comment  [-wunknown-pragmas]  #pragma comment (lib, "ws2_32.lib")  ^ test.c: in function 'createsocket': test.c:46:2: warning: implicit declaration of function 'getaddrinfo' [-wimplicit-function-declaration]   iresult = getaddrinfo("127.0.0.1", default_port, &hints, &result);   ^ test.c:52:2: warning: implicit declaration of function 'freeaddrinfo' [-wimplicit-function-declaration]   freeaddrinfo(result);   ^ test.c:35:6: warning: variable 'iresult' set not used [-wunused-but-set-variable]   int iresult;       ^ c:\users\federi~1\appdata\local\temp\ccaw2c9i.o:test.c:(.text+0xbb): undefined reference `getaddrinfo' c:\users\federi~1\appdata\local\temp\ccaw2c9i.o:test.c:(.text+0x11b): undefined reference `freeaddrinfo' c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: c:\users\federi~1\appdata\local\temp\ccaw2c9i.o: bad reloc address 0x20 in section `.eh_frame' c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: final link failed: invalid operation collect2.exe: error: ld returned 1 exit status compilazione fallita.

i'm using geany ide.

also: why "ignoring pragma" error? thanks.

about

warning: ignoring #pragma comment [-wunknown-pragmas] #pragma comment (lib, "ws2_32.lib")

#pragma comment(lib,"xxx.lib") microsoft c/c++ compiler specific. gcc not support it.

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implicit declaration of function

simply #define _win32_winnt 0x0501 before include, due 

#if (_win32_winnt >= 0x0501) void wsaapi freeaddrinfo (struct addrinfo*); int wsaapi getaddrinfo (const char*,const char*,const struct addrinfo*,                 struct addrinfo**); int wsaapi getnameinfo(const struct sockaddr*,socklen_t,char*,dword,                char*,dword,int); #else /* fixme: need ws protocol-independent api helpers.  */ #endif

in ws2tcpip.h file.


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