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From: "Hans Horn" <hannes AT 2horns DOT com>
Subject: Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll
Date: Fri, 2 Apr 2004 16:23:20 -0800
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Dear Group,

I'd like to follow up on this seemingly abandoned thread.

I just ran into the same problem as reported by Niklas.

Googling around brought me to the idea to try to use mingw's gcc flavour to
create the desired dll.
I just downloaded and uncompressed four of the mingw packages mentioned on
http://www.mingw.org/download.shtml (mingw-runtime, w32api, binutils and gcc
tarball packages) and followed the hints given here:
http://www.mingw.org/mingwfaq.shtml#faq-jni-dll, essentially,

mingw-gcc -Wall -D_JNI_IMPLEMENTATION_ -Wl,--kill-at -shared ...

The JNI dll created this way works neatly (and doesn't make the JVM croak as
the dll created using cygwin's gcc).
This may be just a temporary work-around until cygwin's gcc is back on
track, but at least one can live with it!

cheers,
Hans

"Larry Hall" <cygwin-lh AT cygwin DOT com> wrote in message
news:6 DOT 0 DOT 1 DOT 1 DOT 0 DOT 20040310164105 DOT 03a223e0 AT 127 DOT 0 DOT 0 DOT 1...
> At 02:40 PM 3/10/2004, you wrote:
> >Igor Pechtchanski wrote:
> >
> >>The core Cygwin DLL (/bin/cygwin1.dll) has no support for dynamic
loading.
> >>You may have been lucky before in that the functionality you had in your
> >>DLL didn't require the loading of the core one.  Apparently this has
> >>changed between 1.5.5 and 1.5.7.
> >
> >Right. This seems to be, on the face of it, the same problem that bit the
WinCVS users - WinCVS looks for a tcl84.dll in the PATH and automatically
dynamically loads it, and if it happens to be a Cygwin-compiled one, it
hangs. This also changed after 1.5.6 - before that, it would "work", for
some definition of "working".
> >
> >Someone (I see eyes turning this way :-) needs to debug this, at least to
understand what changed..
>
>
> Dynamic loading of cygwin1.dll has been broken for a very long time.  That
> doesn't mean it cannot be fixed.  Just that figuring out what changed
> between 1.5.5 and 1.5.7 and reinstating it would not be a fix.  It's
> the Cygwin DLL initialization that needs attention really.  But I do
> expect that everyone would like it if someone got this working again. :-)
>
>
> --
> Larry Hall                              http://www.rfk.com
> RFK Partners, Inc.                      (508) 893-9779 - RFK Office
> 838 Washington Street                   (508) 893-9889 - FAX
> Holliston, MA 01746
>
>




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