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Subject: Re: SIGSEGV in cygwin1.dll
From: Marco Canini <marco DOT canini AT fastwebnet DOT it>
To: cygwin AT cygwin DOT com
In-Reply-To: <4045E1A4.6080109@corpit.ru>
References: <40454B4E DOT 8070606 AT fastwebnet DOT it>  <4045E1A4 DOT 6080109 AT corpit DOT ru>
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Message-Id: <1078325897.1626.5.camel@debian>
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Date: Wed, 03 Mar 2004 15:58:17 +0100
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Hello Egor,

On Wed, 2004-03-03 at 14:46, Egor Duda wrote:
> Marco Canini wrote:
> > Hi list, this is my first post here.
> > I'm writing an application that uses SDL, lib3ds and glib
> > I've installed SDL and lib3ds from sources, both compiled with 
> > -mno-cygwin, while glib (2.2) comes from here 
> > http://web.sfc.keio.ac.jp/~s01397ms/cygwin/
> > I wasn't able to compile it from sources, still need to understand why.
> > Anyway after I actually compiled my application I run it and ... SIGSEGV
> 
> So, your application is linked both with cygwin1.dll, and with 
> Microsoft's C library (msvcrt or crtldd) indirectly, via sdl and lib3ds 
> which are built with -mno-cygwin.
> You can't do that. See http://cygwin.com/faq/faq_4.html#SEC99
> 
Yeah, I realized that today.
After trying to compile SDL with host, target cygwin I noticed that it
will always call gcc with -mno-cygwin
Since I don't want to spend my time in figuring out how to configure all
3 libs I'm trying with mingw32 version of sdl, glib.
It's working, great!

> > (The application works in my linux box)
> > With gdb I was able to collect this stack trace:
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x61021a8b in unsetenv () from /usr/bin/cygwin1.dll
> > (gdb) bt
> > #0  0x61021a8b in unsetenv () from /usr/bin/cygwin1.dll
> > #1  0x6101f9b2 in dlfork () from /usr/bin/cygwin1.dll
> 
> That probable means that cygwin's version of unsetenv() is called on 
> variable that was set by Microsoft's runtime.
That is what I couldn't understand, thanks

> You have to build cygwin 
> versions of those 3rd-party libraries you use.
> 
> [...]
> 
> > interestend in compiling only src/winsup/cygwin and not all cygwin.
> > Is it possible? How?
> 
> src/winsup/cygwin is basically all cygwin. You can tweak build process 
> to avoid building misc utilities such as cygcheck etc., but it won't 
> save you much time or disk space.
> > If i can compile it I'll able to understand where's the problem
> 
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-- 
Marco Canini <marco DOT canini AT fastwebnet DOT it>


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