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Message-ID: <42C46687.80A1B5E6@dessent.net>
Date: Thu, 30 Jun 2005 14:39:19 -0700
From: Brian Dessent <brian AT dessent DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: load a shared lib created using gcc/Cygwin
References: <200506302128 DOT j5ULSnbI022603 AT cucujus DOT ucdavis DOT edu>
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Reply-To: cygwin AT cygwin DOT com

Yu-Cheng Chou wrote:

> Can a shared library mylib.dll built using
> gcc -shared -o mylib.dll file.c
> be loaded dynamically at run time by function
> LoadLibrary("mylib.dll") in an application built using
> Visual C++ or .NET?
> I tried it in Windows XP with the latest version of
> gcc/Cygwin, the application will hang
> at LoadLibrary("mylib.dll").

If mylib.dll depends on cygwin1.dll then this will not work.  To load
the Cygwin DLL dynamically requires special attention, as described in
the FAQ: <http://cygwin.com/faq/faq.html#SEC102> and recent mailing list
threads, as this is a very recent ability.

If mylib.dll does not need functionality from Cygwin, then you should
compile it with -mno-cygwin, and it will be dynamically loadable without
extra care just like a standard windows DLL.  More information about
this is at <http://www.mingw.org/MinGWiki/>.  If you go this route you
are no longer using Cygwin so your questions should really be addressed
to the mingw list.

Brian

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