This is the mail archive of the
cygwin
mailing list for the Cygwin project.
Re: Segfault in _cygwin_dll_entry
On Thu, 5 Feb 2004, Larry Hall wrote:
> At 06:10 AM 2/5/2004, peda@sectra.se you wrote:
> >Hello!
> >
> >I have been trying to get LibGGI to build and work on cygwin and
> >I have the following problem:
> >
> >When I run an application linked against the resulting cygggi-2.dll
> >it segfaults in _cygwin_dll_entry@12 (according to gdb) before main
> >is reached.
> >
> >LibGGI consists of three core libraries: ggi, gii and gg.
> >
> >Now, cygggi-2.dll is linked against both cyggii-0.dll and
> >cyggg-0.dll. cyggii-0.dll is in turn linked against cyggg-0.dll. I
> >don't know if there is any relevance to this dependency tree, but
> >I include it since programs linked directly against cyggii-0.dll
> >does _not_ segfault.
> >
> >I can not find any relevant difference between how cygggi-2.dll and
> >cyggii-0.dll are built. None of them defines a _cygwin_dll_entry,
> >which means that cygwin should provide one, if I understand things
> >correctly?
> >
> >strace on the failing application produces no output.
> >The only other dlls these dlls depend on (directly) are cygwin1.dll
> >and kernel32.dll (according to depends.exe provided with MSVC)
> >
> >How can I get more info on what is going on?
>
> I'd suggest 'cygcheck cygggi-2.dll'. Make sure there's no MS CRT in
> there anywhere. If there is, you're on dangerous ground. Comparing the
> output of this with that of cygii-0.dll might be instructive too.
>
> >Is it a known problem?
>
> No. If nothing "obvious" turns up in your initial efforts to scope the
> problem, you're probably going to be best off debugging into the Cygwin
> DLL to see where it crashes.
One obvious thing to check for is whether the application tries to
dynamically load a Cygwin-dependent DLL (which may result in attempting to
load cygwin1.dll dynamically, and that is *not supported*).
Igor
--
http://cs.nyu.edu/~pechtcha/
|\ _,,,---,,_ pechtcha@cs.nyu.edu
ZZZzz /,`.-'`' -. ;-;;,_ igor@watson.ibm.com
|,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/