Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-10-26 Thread Igor Pechtchanski 
Alain,

Please send Cygwin-related questions to the Cygwin mailing list at .  Not only will you get access to more expertise than
any one person can provide, but your questions and the replies to them
will get archived on the web for others to find.

I've forwarded this reply to the list and set the Reply-To: field
accordingly.

On Tue, 26 Oct 2004, ademoulian wrote:

> Have you got any explanation of this problem,
> For I have the same problem, my program stop on the
> System.load("c:/path/libnative.dll")
> There is no error, but the program seems to be in an infinite loop in
> this routine.
>
> Thank you very much for helping me .

Dynamic loading of Cygwin DLLs has been broken for some time.  Since this
doesn't affect the core Cygwin developers, there's little motivation for a
fix.  You could try debugging this yourself and (hopefully) submitting a
patch, or use the "-mno-cygwin" option of gcc, which will build a MinGW
version of your DLL (with all the associated limitations -- please see
http://mingw.org/ for where to ask for help on MinGW).
Igor
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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-09-24 Thread Igor Pechtchanski 
Norbert,

Please do not send private mail with Cygwin questions.  All Cygwin
questions should be addressed to the appropriate Cygwin mailing list.
Addressing your questions to the list not only gives you access to more
expertise than any one person can provide, but also ensures that your
questions and the answers you get are archived on the web for others to
find later.  I'm forwarding this message to the main Cygwin mailing list,
and setting the Reply-To: field accordingly.

On Fri, 24 Sep 2004, Norbert Krömeke wrote:

> Hi Igor,
>
> I have the same Problem on Windows 2000. While the Jave VM try to load
> my DLL compiled with 1.5.11 cygwin, she stays in
> System.load() for ever. No Exception will be generated.
>
> The same sources compiled with 1.5.5 are loaded without
> any problems.
>
> Any idea?
>
> Best Regards
> Norbert Krömeke

.  I doubt anyone will be able to
figure out which "Problem" you're referring to without a quoted message or
a description.

At a guess, you mean that you've built a DLL with Cygwin's gcc, and are
unable to load that into a Java VM via JNI.  This is expected behavior --
cygwin1.dll is *not* dynamically loadable (and thus, any DLL that depends
on it won't be).  .

You may consider MinGW as your alternative (use the -mno-cygwin gcc option
when building the DLL).  Be aware that a) you won't get all of the POSIX
functionality that Cygwin provides, and b) any questions about this setup
should be addressed to the MinGW mailing lists.
Igor
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Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-08-29 Thread Carlo Jennetten 
Hi,

I read the message "2004-04/msg00099.html" and I ran into the same problems.
The option -mno-cygwin didnt't work as well. My only question is about the
state of this issue (bug). Is there someone fixing it, or is it planned to
fix it soon, ...? Because I'd need it urgently.

Best regards,
Carlo


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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-05 Thread Christopher Faylor 
On Sun, Apr 04, 2004 at 01:44:56PM -0700, Hans Horn wrote:
>>>The correct switch is -mno-cygwin.  -mno-cygwin should be equivalent to
>>>building with the mingw compiler unless you try to include cygwin header
>>>files or libraries, which is a common mistake.
>
>Chris, sorry that was I typo in my posting!
>I used gcc -mno-cygwin rather than -no-cygwin, and this did NOT produce a
>working dll
>mingw-gcc did!

Well, there's really not enough data to go on here.  I assume that you must
have linked cygwin libraries in somehow.
--
Christopher Faylor
Cygwin Co-Project Leader
TimeSys, Inc.

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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-04 Thread Hans Horn 
>>The correct switch is -mno-cygwin.  -mno-cygwin should be equivalent to
>>building with the mingw compiler unless you try to include cygwin header
>>files or libraries, which is a common mistake.

Chris, sorry that was I typo in my posting!
I used gcc -mno-cygwin rather than -no-cygwin, and this did NOT produce a
working dll
mingw-gcc did!

thx for responding,
H.




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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-03 Thread Christopher Faylor 
On Sat, Apr 03, 2004 at 06:32:16AM -0300, Fr?d?ric L. W. Meunier wrote:
>On Fri, 2 Apr 2004, Hans Horn wrote:
>
>> this was something I did try out as well. However, the dll produced with
>> "-no-cygwin" was just as "bad" as before.
>> Then I recalled faintly reading some discussion a while back, that
>> "mingw-gcc != gcc -no-cygwin" (don't remember details, though).
>
>-no-cygwin ? I thought it was -mno-cygwin. Or are both the same
>thing ?

The correct switch is -mno-cygwin.  -mno-cygwin should be equivalent to
building with the mingw compiler unless you try to include cygwin header
files or libraries, which is a common mistake.
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Cygwin Co-Project Leader  [EMAIL PROTECTED]
TimeSys, Inc.

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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-03 Thread Frédéric L. W. Meunier 
On Fri, 2 Apr 2004, Hans Horn wrote:

> this was something I did try out as well. However, the dll produced with
> "-no-cygwin" was just as "bad" as before.
> Then I recalled faintly reading some discussion a while back, that
> "mingw-gcc != gcc -no-cygwin" (don't remember details, though).

-no-cygwin ? I thought it was -mno-cygwin. Or are both the same
thing ?

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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-02 Thread Hans Horn 
Hi Igor,

this was something I did try out as well. However, the dll produced with
"-no-cygwin" was just as "bad" as before.
Then I recalled faintly reading some discussion a while back, that
"mingw-gcc != gcc -no-cygwin" (don't remember details, though).

For better or worse, I'm in business now!

thx,
Hans

>FYI, there was no need for you to go to all this trouble.  You could have
>instead installed the "gcc-mingw" and "mingw-runtime" packages via
>Cygwin's setup, and gotten the same functionality via "gcc -mno-cygwin".

>As long as your DLL doesn't use any of Cygwin's POSIX features, you should
>be fine with a MinGW version (i.e., -mno-cygwin one).
>Igor




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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-02 Thread Igor Pechtchanski 
FYI, there was no need for you to go to all this trouble.  You could have
instead installed the "gcc-mingw" and "mingw-runtime" packages via
Cygwin's setup, and gotten the same functionality via "gcc -mno-cygwin".

As long as your DLL doesn't use any of Cygwin's POSIX features, you should
be fine with a MinGW version (i.e., -mno-cygwin one).
Igor

On Fri, 2 Apr 2004, Hans Horn wrote:

> 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" cygwincom> wrote:
> > 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. :-)

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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-04-02 Thread Hans Horn 
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" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> 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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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-10 Thread Larry Hall 
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. :-)


--
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RFK Partners, Inc.  (508) 893-9779 - RFK Office
838 Washington Street   (508) 893-9889 - FAX
Holliston, MA 01746 


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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-10 Thread Shankar Unni 
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..

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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-09 Thread Larry Hall 
At 04:53 PM 3/9/2004, you wrote:
>On Tue, 9 Mar 2004, Martin Proefrock wrote:
>
>> >>It just worked fine with 1.5.5. Now, using 1.5.7, Java crashes inside
>> >>the System.LoadLibrary call, even with a nearly empty DLL.
>>
>> > Try a snapshot. 
>>
>> It still crashes when using the latest snapshot 20040306.
>
>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.  Since this isn't supported, you're
>basically on your own...  Sorry.


Oh jeez.  I guess I was too much on my "try a snapshot" bandwagon today.
Rereading I noticed that Martin mentioned that he was trying to 
dynamically load a Cygwin-enabled DLL.  So yeah, the snapshot isn't going
to help here.  Without Cygwin-enabled Java or a kind patch to the Cygwin 
DLL, this isn't going to work, just as Igor said.

But trying a snapshot was fun, wasn't it?! ;-)


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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-09 Thread Igor Pechtchanski 
On Tue, 9 Mar 2004, Martin Proefrock wrote:

> >>It just worked fine with 1.5.5. Now, using 1.5.7, Java crashes inside
> >>the System.LoadLibrary call, even with a nearly empty DLL.
>
> > Try a snapshot. 
>
> It still crashes when using the latest snapshot 20040306.

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.  Since this isn't supported, you're
basically on your own...  Sorry.
Igor
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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-09 Thread Martin Proefrock 
>>It just worked fine with 1.5.5. Now, using 1.5.7, Java crashes inside
>>the System.LoadLibrary call, even with a nearly empty DLL.

> Try a snapshot. 

It still crashes when using the latest snapshot 20040306.



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Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-09 Thread Larry Hall 
At 03:35 PM 3/9/2004, you wrote:
>It just worked fine with 1.5.5. Now, using 1.5.7, Java crashes inside
>the System.LoadLibrary call, even with a nearly empty DLL.
>
>I can't use -mno-cygwin because I use cygwin-specific stuff.
>
>Any hints, beside using the older version?


Try a snapshot. 



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Loading gcc-compiled DLL with Java (JNI) crashes when using newer (>1.5.5) cygwin1.dll

2004-03-09 Thread Martin Proefrock 
It just worked fine with 1.5.5. Now, using 1.5.7, Java crashes inside
the System.LoadLibrary call, even with a nearly empty DLL.

I can't use -mno-cygwin because I use cygwin-specific stuff.

Any hints, beside using the older version?

Martin


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