Bug#787217: clang++-3.7 generates wrong code with -O1 or -O2

[Gianfranco Costamagna]

Hi,

> From upstream's answer, it appears that clangs optimizers may reorganize
> the code under the assumption that it's safe to divide by 0, i.e. that
> the code will only run under the default floating-point environment.
> 

this is not reproducible on 3.8, and on 3.7 is reproducible as said only with O1 and O2

(I expect 3.7 to be removed from unstable in some days)

G.

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