Re: [PATCH] bitbake.conf/abi_version.conf: Update to use BasicHash signature generator

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Fri, 2012-06-22 at 16:24 +0200, Enrico Scholz wrote:
> Richard Purdie
> <richard.purdie-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
> writes:
> 
> > This switches to use the hash based signature generatior and update
> > layout_abi to match stamp file layout changes.
> 
> Has this really been tested?

Its the default in Poky and Angstrom. It was the default for the Yocto
Project 1.2 release too. So yes, it has seen testing.

>  I played a little bit with it and it was
> very painful when whole distribution will be rebuilt due to a minor
> change in an early package.
> 
> There are some subtle bugs in the hash generation too (e.g. bitbake's
> get_file_depends() result is used to calculate a hash over a set() which
> is filled nondeterministically when BB_NUMBER_THREADS>1) which cause
> random rebuilds too.

Bug reports on issues like this would be good, we can't fix a problem if
we don't know about it.

Cheers,

Richard