Re: My Emacs unicode 2 crash again when I do some *Replace String (M-%)*, I give the debug informations under gdb in the attachments.

[Stefan Monnier]

> I couldn't convince GCC developers that debuggability is much more
> important in the vast majority of cases than the extra 5%-7%
> performance gains one gets by using all the tweaks -O2 does that
> defeat debugging.  Sigh.

I haven't followed any of gcc's development, but I do have to point out that
keeping track of source-line numbers through all compilation and
optimization phases is tremendously difficult and tiresome, even for
relatively simple optimizations.  And then
designing/understanding/generating/using debug info is itself a challenge.

So if you want reliable debuggability, avoid optimizations.


        Stefan