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From:	ejfried AT ca DOT sandia DOT gov (friedman_hill ernest j)
Message-Id:	<200301171627.IAA03968@ca.sandia.gov>
Subject:	Re: Using cygwin and JAVA/JNI
In-Reply-To:	<5.2.0.9.2.20030117080839.029861d0@pop3.cris.com> from Randall R
	Schulz at "Jan 17, 2003 08:11:39 am"
To:	cygwin AT cygwin DOT com
Date:	Fri, 17 Jan 2003 08:27:23 -0800 (PST)
MIME-Version:	1.0

Randall is usually 100% right about everything, but here he's actually
not. I haven't done it in a long time, but I've certainly written JNI
libraries with cygwin -- and in fact, used some fairly cygwin specific
features in doing so (my JNI library explicitly used dlopen() to open
another library, as I recall, and it all worked; and furthermore, much
of my library was written in C++, but the JNI entry points were
exported as 'extern "C".') I was amazed and thrilled when it all
worked.

When I did this, Mumit Khan's web page on the topic was invaluable,
but cygwin has changed a lot since then, so I'm sure the information
is out of date. Anyway, you might start by looking at the JNI links
halfway down this page:

   http://www.xraylith.wisc.edu/~khan/software/gnu-win32/


I think Randall R Schulz wrote:
> Gilles,
> 
> I don't believe the ABI (application binary interface) used by the 
> Microsoft compilers is compatible with that used by GCC and hence the Sun 
> JVM, being compiled by the Microsoft tools, cannot access GCC-compiled 
> libraries via JNI.
> 
> Randall Schulz
> 
> 
> At 06:41 2003-01-17, gilles BOURGEOIS wrote:
> >hello
> >
> >I wonder if it is possible to use JNI upon a DLL .i.e a shared libray like 
> >.so file generated with gcc, without the mno-cygwin option. (my lib uses 
> >IPC SYSTEM V, that is why I rely on the cygwin and cygipc libraries) I am 
> >not a newbie with java/jni or gcc, but mixing all of them seems to crash 
> >the JVM. Of course, It works if the library is generated with gcc under 
> >linux but if executing the whole program (JVM instantiate) under cygwin, 
> >it fails. Any one ever performed such a tricky architecture? thanks
> >
> >gilles
> 
> 
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---------------------------------------------------------
Ernest Friedman-Hill  
Distributed Systems Research        Phone: (925) 294-2154
Sandia National Labs                FAX:   (925) 294-2234
PO Box 969, MS 9012                 ejfried AT ca DOT sandia DOT gov
Livermore, CA 94550         http://herzberg.ca.sandia.gov

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