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

[Richard Stallman]

I don't think that debugging with any specific optimizations is any
harder than it ever was.  What has perhaps changed is that GCC does
additional optimizations, some of which can confuse debugging in
additional ways.

    The situation is not black and white.  With some cooperation, I'm
    positive we could have had an option that enables only those
    optimizations which do not severely hamper debugging.

That might be a useful feature.  If someone wants to prepare an
argument for it, and send it in to address@hidden cc'ing me, I could
support it.  (I suggest showing me a draft to review before you sent it.)