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Date: Mon, 18 Dec 2006 13:14:17 +0900
From: "Wynfield Henman" <wynfield AT gmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: libraries
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Larry,  thank you for the explanation regarding libraries.

On 12/14/06, Larry Hall (Cygwin) <reply-to-list-only-lh AT cygwin DOT com> wrote:
> Wynfield Henman wrote:
> > I have managed to confuse myself regarding libraries under cygwin,
> > after reading extensively on building dlls under cygwin.....
> >
> > Please check if my understanding is correct.
> > (1) For simple static libraries ld's output is fine.
> >     Because only cygwin code will access it.
> >
> > (2) Does this follow with *nix shared library format? (if only used by
> > cygwin programs which
> >    emulate *nix (does it also know about shared library objects)?
> >
> > (3) The ms-dll shared library format is only necessary if we want
> > ms-programs to be able to
> >     use the program.
> >
>
>
> There's no incompatibility of object format between Cygwin static libs
> and those created by the MS compiler.  Ditto for DLLs.  There is no such
> thing as shared libraries in the traditional UNIX sense on Windows.  The
> only "incompatibilities" between Cygwin built libs/DLLs and MS's are:
>
>    1. References to C++ in libs/DLLs built in one won't be resolved in the
>       other (this is true when mixing and matching C++ object code from any
>       compiler).  This is not a problem for C code.
>
>    2. Calling Cygwin compiled code from a native executable needs some extra
>       steps to make sure that the Cygwin C-runtime initialization code gets
>       called.  The reverse situation is not generally a problem.
>
Larry...

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