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Re: Designs for better debug info in GCC


> Yes, catching all such cases hasn't been trivial.  If we miss some,
> then what happens is that -O2 -g -fvar-tracking-assignments outputs
> different executable code than -O2.

But that's a very serious type of bug because it means you have
situations where a program fails and you can't debug it because when
you turn on debugging information, it doesn't fail anymore.  We need
to make an absolute rule that this *cannot* happen and luckily this is
one of the easiest types of errors to project against.


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