gcc 3.3.6 - stack corruption questions

[Giovanni Bajo]

Louis LeBlanc <leblanc@keyslapper.net> wrote:

> I added the -fstack-check switch to my makefile and recompiled with
> various optimizations.  I was pretty surprised at the file sizes that
> showed up:
> 
> No Optimization:
> -rwxr-xr-x  1 leblanc  daemon  1128660 Jul 25 16:25 myprocess*
> 
> Optimized with -O2
> -rwxr-xr-x  1 leblanc  daemon  1058228 Jul 25 17:36 myprocess*
> 
> Optimized with -O3
> -rwxr-xr-x  1 leblanc  daemon  1129792 Jul 25 17:32 myprocess*
> 
> I would have expected much different results.  Shouldn't the file
> sizes be smaller (at least a little) with the -O3 switch?  Maybe
> there's a loop unrolled to make it faster, resulting in a larger
> codebase?


Or inlining, or many other things. If you care about size, use -Os.
-- 
Giovanni Bajo