using non-standard optflags (-O3, in particular)

[Simon Perreault]

On Friday February 9 2007 16:22, Patrice Dumas wrote:
> Yes, but isn't the gain worth this issue?

No, because a build *absolutely* needs to be deterministic, for security 
reasons among others.

> And it shouldn't be that 
> nondeterministic or it means that the gain in execution time isn't
> that big.

You're right, but it is or it isn't. This isn't an analog thing.

See the ATLAS package for ways to deal with this kind of thing. You have 
to "record" the execution on a host and be able to replay it 
deterministically.