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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 13:56:49 +0200
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Hi Dave,

the dependency was a bug of my own.

I tried linked against pthread...

now the my dll does not depend on cygwin1.dll anymore

Thanks a lot for your help
Georg
Am 28.07.2009 um 12:56 schrieb Georg Troska:

> 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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