Re: Building packages twice in a row

[Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>]

Tyler MacDonald <tyler@yi.org> writes:

> Steve Langasek <vorlon@debian.org> wrote:
>> > granted there are things like this, but reproducible builds would be 
>> > fantastic and well worth the effort.
>> If you're talking about "byte-for-byte identical builds", then no, that
>> would be a tremendous amount of effort for no practical gain.  There's no
>> reason to consider it a bug for packages to not be byte-for-byte identical
>> between two builds, so why should anyone waste time trying to "fix" it?
>
>   We should expect that given the same source, headers, and libraries, we
> would get the same bytes out of a build every time. Any deviation from this
> would indicate something different, or erratic. If it doesn't cause
> problems, fine, but I'd raise an eyebrow over it anyway.
>
>   I guess it depends on how anal and pedantic you want to get.
>
> 	- Tyler

I think even gcc has some optimizing code with randomness in it. The
randomness is there to avoid deadlocks or just plain guessing a few
times and picking the best.

MfG
        Goswin