On 01/05/2014 02:26, George Colpitts wrote:
To elaborate, in the past, I had a lot of problems using libraries from
the ghci prompt on the Mac but I haven't tried recently.
As an example, on the web page
<http://www.cs.yale.edu/homes/hudak/SOE/software1.htm> for the book the
Haskell School of Expression it says:
Note for OS X users: running graphics applications from GHCi is no
longer supported. Instead, one has to compile a graphics program
using GHC in order to run it (see example/GMIExamples.lhs for an
example).
I had similar problems using the Yale Euterpea music program from ghci.
When I inquired I was referred to
https://ghc.haskell.org/trac/ghc/ticket/4244 and
https://ghc.haskell.org/trac/ghc/ticket/781. I see that the latter is
now scheduled for 7.10.1
I think we just punted on all the problems and assumed that dynamic
linking would fix everything. What we've found is that dynamic linking
causes a whole new set of problems and complexities. Meanwhile, many of
the original problems have been fixed (except #781, which is kind of
unfixable, but fortunately is also quite rare).
Unfortunately dynamic linking is needed to support GHCi and TH on
unregisterised platforms. In 7.8, GHCi and TH now works on some
platforms where it didn't before (albeit not very widely used platforms).
Cheers,
Simon
On Wed, Apr 30, 2014 at 1:45 PM, Simon Marlow <marlo...@gmail.com
<mailto:marlo...@gmail.com>> wrote:
On 30/04/2014 01:35, George Colpitts wrote:
It doesn't have anything about the dynamic linking changes made
for 7.8.
I think it's worth mentioning the improvements we expect to get from
that. The highlights of the release notes do mention it, so
maybe that
suffices.
In particular, I'm hoping that it is going to fix a lot of
problems with
using foreign libraries such as OpenGL from ghci. I could be
wrong about
that though.
I'd like to understand more about what those problems are. As a
data point, at Facebook we're using static linking (I compiled GHC
with DYNAMIC_GHC_PROGRAMS=NO), we're loading upwards of 50 3rd-party
C++ libraries and one gigantic shared library consisting of a ton of
in-house C++ code, together with all our Haskell code into GHCi, and
it works perfectly. The key to using the static linker is to not
use it for C++ code - you want all your external C++ code in shared
libraries and load those using the system linker.
Dynamic linking has been a huge headache in GHC, and it's not clear
that it's an overall improvement compared with the static linker.
Now that 7.8 is out of the way, it's time to have a conversation
about whether we want to do dynamic linking again for 7.10, or
revert to static linking. I think Austin is going to update
https://ghc.haskell.org/trac/__ghc/wiki/DynamicGhcPrograms
<https://ghc.haskell.org/trac/ghc/wiki/DynamicGhcPrograms>, and then
we'll see where we stand.
Cheers,
Simon
On Tue, Apr 29, 2014 at 6:13 PM, Simon Peyton Jones
<simo...@microsoft.com <mailto:simo...@microsoft.com>
<mailto:simo...@microsoft.com <mailto:simo...@microsoft.com>>__>
wrote:
As Austin has told us, there’s a draft of the *GHC Status
Report for
the HCAR*, here:____
https://ghc.haskell.org/trac/__ghc/wiki/Status/May14____
<https://ghc.haskell.org/trac/ghc/wiki/Status/May14____>
Have we missed out something you have been working hard
on? Do
take a moment to add a bullet in an appropriate place (it’s a
wiki). I’d like to be sure that we are giving credit to
all the
appropriate people, so please help us fix that too. GHC is
a team
effort.____
Deadline is 1 May I think.____
Thanks____
Simon____
__ __
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