Re: Cygwin 64bits gcc produces erroneous constants with the win32 headers.

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Apr 15 22:41, Corinna Vinschen wrote:
> On Apr 15 12:56, Nicolas Noble wrote:
> >  This is an issue
> > when trying to compile a 64 bits binary that uses the win32 api,
> > nothing more.
> 
> One problem is that you're not supposed to use WinSock or the winsock
> headers when compiling Cygwin applications.  Use the Cygwin POSIX headers
> and Cygwin socket functions instead.  If you use WinSock headers and/or
> functions and it breaks, you got to keep the pieces.

Btw., the preceeding paragraph is even more true after fixing Mingw-w64's
winsock headers because in this case values like FIONREAD, FIOASYNC,
etc (*) will *collide* when using WinSock and Cygwin headers due to their
different values.

So, again, to be very clear:  Never mix Cygwin's POSIX socket functions
and Cygwin's POSIX socket headers with Winsock headers and functions.
In theory only Cygwin should be a consumer of the Winsock headers and
functions in a Cygwin environment.


> The problem with the WInSock definition of FIONBIO (and probably others)
> is a bug in the w32api-headers and thus might be most effectifely
> handled upstream in the Mingw-w64 community.
> 
> You're basically right about the redefinition of FIONBIO, but u_long is
> the type used by Microsoft and thus the Mingw-w64 project would probably
> like to keep it that way for compatibility with their upstream :)
> 
> OTOH, u_long in an LP64 environment *must* have the same size as long,
> thus 8 bytes.
> 
> However, Mingw-w64 already contains a lot of changes to accommodate
> the Cygwin LP64 environment, and incidentally there's already a type
> available which does the right thing, so it might be a good idea to
> suggest using that:
> 
> #define FIONBIO _IOW('f',126,__ms_u_long)


Corinna

(*) FIONBIO is an exception beacuse its value in the Cygwin headers
    is hardcoded to 0x8004667e for historical reasons.

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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