On Wed, Sep 04, 2013 at 10:57:26AM +0100, L. David Baron wrote: > > The way the tier build works is that we effectively make export in all > > directories of a same tier before make libs. In practice, this means > > xpcom had access to every header in platform already, and any tier built > > before platform, for that matter. So only app headers weren't available > > to xpcom, and that's not a lot of them. > > > > So, really, nothing was already there to prevent backwards dependencies. > > At least not in a very long time (I don't remember if we ever did > > (make export; make libs) recursively directory by directory instead of > > tier by tier.) > > So I was assuming that xpcom was in a different tier from layout; > apparently that's not the case. (I thought it was originally, but > my memory could be wrong.)
You're right, this was changed in bug 528250 http://hg.mozilla.org/mozilla-central/rev/b7b5c61b1af8 > But is it correct that this change means we no longer have the > backwards-dependency checking for things in different tiers? Yes, but since most things are in the platform tier, and the platform tier is almost last (there's only the app tier after it), it wasn't much relevant. What probably matters most to protect is js, and js standalone builds should provide that protection. Mike _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
