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Re: Proposed release goal: fix debian/rules build-arch



On Mon, Feb 16, 2009 at 11:21:42AM -0800, Russ Allbery wrote:
> Such a requirement unfortunately still won't mean that Lintian can use
> that option to do a check of debian/rules.  As long as make is willing to
> run such code, we can't just rely on a Policy statement saying that you're
> not supposed to do that.  It is, among other things, a security problem.

That's a good point, but not running debian/rules means that you'd be
making it a requirement to write debian/rules files in a stylised way,
to make it greppable.  Conventions are one thing, that'd be another.
That'd have a human cost too.  But this is somewhat coincidental to
this.  Coming up with a test, even an imperfect one, could help push
changes forwards.

> I have to admit that I'm tempted by this approach, mostly because it's not
> clear to me that the build-arch vs. build-indep separation actually gains
> us anything that useful.  The point, so far as I can tell, is to save
> buildd time by not building the architecture-independent packages.  How
> much time would we actually be saving?  Is it worth putting a lot of human

Ask buildd admins.  They could start downloading and installing B-D-I
along with B-D today.  Deprecating B-D-I and -arch and -indep would be
a small step after that.

> effort into making that situation possible?  Generally CPU cycles are far,
> far cheaper than human cycles.

Another thing that B-D-I is good for: breaking dependency cycles.  An
example from the upcoming version of ghc6: ghc6 uses haddock to build
API docs.  Haddock needs to be built with the same version of ghc6 it
generates docs for.  Putting haddock in ghc6's B-D-I avoids that
cycle.


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