[yocto] Trying to re-use sstate.

[Chris Larson]

On Mon, Feb 6, 2012 at 12:53 AM, David Nyström <david.nystrom at enea.com> wrote:
> On 02/04/2012 05:51 AM, Scott Garman wrote:
>>
>> Hello,
>>
>> I'm trying to re-use the sstate from one build directory and move it to
>> another. It's not working - bitbake is rebuilding *everything*.
>>
>> My hunch is the reason for this is because bblayers.conf must differ
>> between the two build directories, because it uses full paths to the
>> layer directories.
>>
>> By default, when you source oe-init-build-env for the first time, it
>> generates a bblayers.conf file with full paths to the default layers,
>> meta and meta-yocto.
>>
>> I thought the point of sstate was that I could copy it between build
>> directories - or even different hosts - and save myself the effort of
>> rebuilding everything if the remaining metadata was the same?
>>
>> Scott
>>
> We have the same issue,
>
> I tried to setup a buildbot to warm up sstate caches over night,
> and let developers use this common sstate to speed up build times.
> Epic fail, since paths usually are not consistent.
> And it seems you can't even fake  an "identical path" with symlinks
> either, bitbake detects the symlink and rebuilds everything.


Afaik your BBLAYERS should not be in your signatures at all, unless
something in the metadata is accessing it. For what it's worth, I
reuse sstate every day, but don't use the poky/oe-core scripts
(oe-init-build-env).
-- 
Christopher Larson