[sane-devel] unpaper default parameter - empty output bug
Fri, 11 Mar 2005 23:25:42 +0100
Peter Fales wrote:
> 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.
Try compiling it with compiler option --pedantic
That results in lots of warnings, of which some look very suspicious.
I' m not sure how big the stack is by default, but unpaper appears
to put quite a lot of local variables on the stack
(at least 140000 ints). Perhaps the stack overflows.