[Mingw-users] IPV6 Code under MinGW

[Brendon C. <br...@ch...>]

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Hi All,

	I have some IPv6 socket code i have written to compile using MinGW. The
code compiles fine at work but at home it does not. The problem is with
certain define directives in the ws2tcpip.h file. I am trying to use the
functions below that are not being found:

getaddrinfo undeclared (first use this function)
freeaddrinfo undeclared (first use this function)
getnameinfo undeclared (first use this function)


I had a look in the ws2tcpip.h file and noticed that around these
functions there is a statement:

#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


Looking on the web i found some information saying that you need to
define some statements that tell the compiler i want to compile for
Windows XP systems or above (So not supporting Win95 etc). I tried
defining some/all of the variables in my config.h file:

_WIN32_WINNT
_WIN32_WINDOWS
_WIN32_WINNT
WINVER

to WindowsXP or 0x0501 and still to no avail. It seems that before the
#ifdef statement inside the ws2tcpip.h file, something is re-defining
_WIN32_WINNT to a value other than the one i specified.


The order of includes is shown below:

#include "config.h"
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <ws2tcpip.h>
#ifndef IPPROTO_IPV6
   // If the version of winsock does not by default include IPV6 then
   // use the tech preview if it is avaliable.
   #include <tpipv6.h>
#endif

#include <windows.h>


Is there something i need to do differently in order to access
getaddrinfo and the other functions?

Note: Both the installs (Work and Home) seem to have version 3.3 of the
w32api package installed. If you need any other information about
installed packages, let me know.


Thanks for any help,
Brendon.


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