Re: changing "configure" to default to "gcc -g -O2 -fwrapv ..."

[Richard Kenner]

> I can do this.  What I also will do is improve VRP to still fold comparisons
> of the for a - 10 > 20 when it knows there is no overflow due to available
> range information for a (it doesn't do that right now).

I thought fold-const.c optimizes that right now and has been for a long time?
If that's the case, I don't see why we should change it: we have absolutely
no evidence of legacy code that would be affected and it's quite common due
to macro substitution.