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From: Georg Troska <georg DOT troska AT uni-dortmund DOT de>
To: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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Subject: Re: mingw headers and libraries missing
Date: Tue, 28 Jul 2009 12:56:19 +0200
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Hi,
this information was very usefull to me. Thank you very much.

My plan is to build a dll with cygwin, that does not depend on  
cygwin1.dll.
unfortunatelly my library is build now (that is great) but it still  
depends on cygwin1.dll (I have done objdump -P .. | grep dll)

Is it possible that the w32api-winsock library depends on this as  
well? I do not understand where this dependency comes from

Thank you very much
Am 28.07.2009 um 12:11 schrieb Dave Korn:

> Georg Troska wrote:
>> hi,
>> thank you very much for this information
>>
>> Where o I find windsock.h and its library? Do I need a SDK (e.g.  
>> Visual
>> C++) for this?
>
>  Nope, you need the w32api package (you should probably already have  
> it),
> this works for both cygwin and mingw compiles and provides headers in
> /usr/include/w32api and libraries in /usr/lib/w32api that let you  
> use all the
> standard windows OS functions.  The file you're looking for is
> /usr/include/w32api/winsock2.h (plain 'winsock.h' only gives the old  
> V1
> windows socket interface, nobody uses it any more), and the library is
> /usr/lib/w32api/libws2_32.a, the -I and -L options for the compiler  
> should
> already be set up correctly so you just write "#include  
> <winsock2.h>" in your
> C source and add '-lws2_32' to the compiler command line and away  
> you go.
>
>  Note that you only want this as long as you're using -mno-cygwin;  
> if you
> decide to write a Cygwin application, you just use the standard  
> POSIX socket
> functions and don't use winsock2.h or libws2_32.a, and the Cygwin  
> DLL takes
> care of the rest for you.  (It is even possible to write a Cygwin  
> app that
> bypasses the Cygwin DLL POSIX socket functions and uses the winsock  
> API
> directly, but it's not a standard thing to do and fraught with  
> possibilities
> for bugs to arise, so I'd recommend against it.)
>
>    cheers,
>      DaveK
>
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