Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
Alain, Please send Cygwin-related questions to the Cygwin mailing list at cygwin at cygwin dot com. 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 -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_[EMAIL PROTECTED] ZZZzz /,`.-'`'-. ;-;;,_[EMAIL PROTECTED] |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! Happiness lies in being privileged to work hard for long hours in doing whatever you think is worth doing. -- Dr. Jubal Harshaw -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 http://cygwin.com/acronyms/#PPAST. 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). http://cygwin.com/acronyms/#PTC. 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 -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_[EMAIL PROTECTED] ZZZzz /,`.-'`'-. ;-;;,_[EMAIL PROTECTED] |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! Happiness lies in being privileged to work hard for long hours in doing whatever you think is worth doing. -- Dr. Jubal Harshaw cygcheck.out Description: Binary data -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 ? -- http://www.pervalidus.net/contact.html -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. -- Christopher Faylorspammer? - [EMAIL PROTECTED] Cygwin Co-Project Leader [EMAIL PROTECTED] TimeSys, Inc. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 cygwin-lhatcygwindotcom 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. :-) -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_[EMAIL PROTECTED] ZZZzz /,`.-'`'-. ;-;;,_[EMAIL PROTECTED] |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! I have since come to realize that being between your mentor and his route to the bathroom is a major career booster. -- Patrick Naughton -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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.. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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 smime.p7s Description: S/MIME Cryptographic Signature
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. http://cygwin.com/snapshots/ -- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 838 Washington Street (508) 893-9889 - FAX Holliston, MA 01746 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. http://cygwin.com/snapshots/ It still crashes when using the latest snapshot 20040306. smime.p7s Description: S/MIME Cryptographic Signature
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. http://cygwin.com/snapshots/ 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 -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_[EMAIL PROTECTED] ZZZzz /,`.-'`'-. ;-;;,_[EMAIL PROTECTED] |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! I have since come to realize that being between your mentor and his route to the bathroom is a major career booster. -- Patrick Naughton -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: Loading gcc-compiled DLL with Java (JNI) crashes when using newer (1.5.5) cygwin1.dll
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. http://cygwin.com/snapshots/ 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?! ;-) -- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 838 Washington Street (508) 893-9889 - FAX Holliston, MA 01746 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
