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To:	cygwin AT cygwin DOT com
From:	Sam Steingold <sds AT gnu DOT org>
Subject:	Re: crash on the first statement in main()
Date:	16 Jul 2003 18:18:47 -0400
Organization:	disorganization
Lines:	64
Message-ID:	<uel0q15fc.fsf@gnu.org>
References:	<ubrwtwvmi DOT fsf AT gnu DOT org> <uk7as63nh DOT fsf AT gnu DOT org>
Reply-To:	sds AT gnu DOT org
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X-Attribution:	Sam
X-Disclaimer:	You should not expect anyone to agree with me.
User-Agent:	Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50

> * In message <uk7as63nh DOT fsf AT gnu DOT org>
> * On the subject of "Re: crash on the first statement in main()"
> * Sent on 08 Jul 2003 18:43:14 -0400
> * I write:
> > * I write:
> >
> > I get a segfault on the first executable line in main() (confirmed in
> > the debugger), both when produced by cygwin:
> > 
> > gcc modules.o regexp.o regexi.o regex.o lisp.a
> >  -lintl libcharset.a libavcall.a libcallback.a -lreadline -lncurses
> >  -liconv -lm -o lisp.exe
> > ...
> > full/lisp.exe -B . -M base/lispinit.mem -norc -q -i regexp/regexp
> >  -x (saveinitmem "full/lispinit.mem") 
> > Signal 11
> > make: *** [full] Error 1
> > 
> > and mingw:
> > 
> > gcc -mno-cygwin modules.o regexp.o
> >  regexi.o regex.o lisp.a libcharset.a libavcall.a libcallback.a -luser32
> >  -lws2_32 -lole32 -luuid -o lisp.exe 
> > full/lisp.exe -B . -M base/lispinit.mem -norc -q -i regexp/regexp
> >  -x (saveinitmem "full/lispinit.mem")
> > <win32 crash dialog box>
> > 
> > the lines don't do anything special, in fact, "p <the offending line>"
> > executes just fine in gdb right after the crash.
> 
> I forgot a crucial piece of information:
> 
> the segfault happens only with "-g"!
> when I compile with "-O2", it works like a charm.

Another crucial piece of information, just discovered:

lisp.a is built like this:

ld -r -o lisp.o <a couple of dozens object files>
chmod a-x lisp.o
ar rcv lisp.a lisp.o
ranlib lisp.a

if I replace "lisp.a" with "lisp.o" in the GCC call that creates
lisp.exe, I get the same crash.
if I replace "lisp.a" with the full list of <a couple of dozens
object files>, everything works out just fine.

if I remove "lisp.o" altogether and create "lisp.a" with

ar rcv lisp.a <a couple of dozens object files>

everything works out just fine.

So, for now, I have a workaround.
However, this appears to be a bug in binutils.
Comments?

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.palestine-central.com/links.html>
My other CAR is a CDR.


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