7.8 Release Update

Kazu Yamamoto ( 山本和彦 ) kazu at iij.ad.jp
Mon Sep 9 02:16:24 UTC 2013

Hi Austin,

I would like to ask about profiling and dynamic linking.

If I understand correctly, GHC 7.8 with cabal-install 1.18.x.x uses
dynamic linking by default (except on FreeBSD). But GHC 7.8 provides a
profile library only for static linking. An example is the base


Profile libraries for dynamic linking are not provided. So, I got
troubles when I tried to take profile of my programs. I need to
specify "--disable-shared" explicitly to cabal-install. (This sometime
fails if Build-Type: is Custom.)

Is this intentional? Are there any technical reasons to not provide
dynamic profile libraries?


> Friends,
> After talking with SPJ, we've decided that the cutoff date for the 7.8
> feature window will essentially start on Monday, the 16th. This is the
> beginning of the week before ICFP. This is a week from tomorrow.
> Afterwords, I suspect we will cut the 7.8 branch in early October (my
> notes tentatively say Oct. 9th.) This will give us a few weeks of
> straight bugfixing.
> Don't let this scare you too much. We're doing this at the beginning
> of the week so we have time to sort things out. Bug fixes will of
> course continuously be welcome until the 7.8 branch.
> However, for pending features, I'd like a status update. Everyone
> mentioned below, please reply to clarify anything:
>  * Iavor Diatchki and SPJ are working together on the type-nats-simple
> branch. I believe this will hopefully land in time. Iavor, SPJ - can
> you comment here?
>  * Trevor and Iavor are also working on kinds without data. Any word here?
>  * Geoffrey is currently moving, but he says the SIMD work and new
> template-haskell work will land by the end of this week, which is
> great.
>  * Patrick Palka has a few loose ends to tie off for the parallel
> compilation driver. I talked to him today, and after Andreas committed
> his bugfix to base, I believe everything is now working, with the
> deadlocks sorted out. Patrick, can you confirm? We can get this merged
> ASAP if so.
>  * Pedro and Richard - what's the story on propositional equality,
> etc? This is mentioned on the status page[1] but I'm not sure what
> else needs to be done. I know Pedro committed the work to make manual
> Typeable instances an error, which is great.
>  * Luite and Edsko will be talking about some final changes to the
> hooks patch, and afterwords it can hopefully be integrated. I'll keep
> up with them this week.
>  * I am currently working on integrating the Applicative-Monad
> warning, but this requires some upstream patches for the build to
> work. However, we still need to sync several upstream libraries, and
> this will be happening over the next few weeks. Therefore, I may
> commit it, and incrementally fix validation errors as time goes on and
> me and Herbert sync upstreams.
> IMO, most of these look to be in good shape, I think.
> If you *do not think you'll make it by the 16th*, please let me know.
> We can possibly still land it the week of the 16th, provided I know
> ASAP. But we really really need to know, because many people will be
> gone the following week.
> In the following few days, I'm hoping going to finish off everything I
> can in the patch queue, and fix my remaining bugs, and investigate
> Dynamic GHCi in particular.
> Again, if you don't think you can make it on the 16th, but still
> within the week, we can of discuss it.
> -- 
> Regards,
> Austin - PGP: 4096R/0x91384671
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