Bug 863091 made automatic clobbering when /CLOBBER is touched only happen for builds which opt in in their mozconfig by exporting AUTOCLOBBER=1. b2g builds appear to have mozconfigs, but they appear to live in some other tree, so they didn't get opted in, though they still have the configure check which causes them to burn whenever /CLOBBER is touched.

I'm guessing somewhere here: https://github.com/mozilla-b2g/gaia/blob/master/Makefile#L74 (though the comment implies that would affect local user builds too) Or else via buildbot/mozharness?

Some B2G mozconfigs for buildbot are here: http://mxr.mozilla.org/mozilla-central/source/b2g/config/mozconfigs/ The mozconfig used for device builds is here: https://github.com/mozilla-b2g/gonk-misc/blob/master/default-gecko-config

(In reply to Jonathan Griffin (:jgriffin) from comment #2) > Some B2G mozconfigs for buildbot are here: > http://mxr.mozilla.org/mozilla-central/source/b2g/config/mozconfigs/ > > The mozconfig used for device builds is here: > https://github.com/mozilla-b2g/gonk-misc/blob/master/default-gecko-config The former pulls in the global common mozconfig (http://hg.mozilla.org/mozilla-central/file/3fb2370f4871/b2g/config/mozconfigs/common) - so will include my change. Guessing the latter is what we are missing.

Bump (I don't have gaia access) - burnt more builds today because of this bug.

So, I'm guessing then, that the right fix is to add: . "$topsrcdir/b2g/config/mozconfigs/common" to the top of gonk-misc/default-gecko-config?

(In reply to Dave Hylands [:dhylands] from comment #5) > So, I'm guessing then, that the right fix is to add: > > . "$topsrcdir/b2g/config/mozconfigs/common" > > to the top of gonk-misc/default-gecko-config?

Yep, that should do it.

Enable AUTOCLOBBER

Merged into gonk-misc/master: https://github.com/mozilla-b2g/gonk-misc/commit/917cb23483a02eb70d5b86a1a4d2eae65adab2d4