[sane-devel] unpaper default parameter - empty output bug

Peter Fales psfales@fales-lorenz.net
Fri, 11 Mar 2005 15:29:37 -0600

Thanks for all your help.  I think we're getting closer.  I'm using the 
Makefile rules supplied with unpaper:

        cc     unpaper.c   -o unpaper -lm
so I was already using no optimization.   I was using gcc-3.2.2 which
is the default compiler on my system.  I tried building with gcc-2.95.3
and it worked!  It also fails with gcc-3.4.3.  Oh wait!  When I use 
gcc-2.95.3, it also fails when I use -O2!   Perhaps gcc-3 is doing some
optimazation automatically that gcc-2 only does when -O is used.  Wierd. 

Now that I can build both a working and non-working version, I should
be able to track down where the two are diverging.  Not sure how quickly
I can get to it though.

Peter Fales
Peter "at" fales-lorenz.net

On Fri, Mar 11, 2005 at 10:11:15PM +0100, Jens Gulden wrote:
> Peter Fales schrieb:
> >Now that's wierd.   I was using a privately built copy of unpaper, but I
> >just unpacked the tarball and get the same results with the prebuilt 
> >binary!
> I just reproduced the problem on one remote Intel machine I have access to.
> Try to compile without any optimization (no -Ox), this was the only way 
> for me to get a usable executable for that machine. Does it help for 
> you? (I am using gcc 3.3.5 on Debian.)
> Jens
> >
> >It seems that the same demo file and binary works for you but gives a white
> >page for me.   I can't think of any reason why that would be.   My first
> >thought was shared libraries, but unpaper doesn't seem to have any unusual 
> >shared library dependencies.  Do you invoke any external programs that 
> >might be different on my system?
> >
> >I'll try to take a look at the code this weekend and see if I see any 
> >ideas.  If you have any debugging you want me to do (e.g. strategically 
> >placed
> >printf's ) just let me know.
> >
> -- 
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