Agreed. I'd much rather never again problems in ghci + linking,
Its one of the biggest sources of exotic bugs for new haskellers on OS X,
for all that i've never quite managed to ever pin down a simple test case
to replicate those problems
point being: ghci should do normal dynamic linking for reduced engineering
complexity + an end to "it doesn't work in ghci" woes that some folks
periodically enncount
+++++1
-Carter
On Tue, Dec 4, 2012 at 9:33 PM, Manuel M T Chakravarty wrote: This has some advantages and some disadvantages, so we need to make a
decision about what we want to do in GHC 7.8. There are also some policy
questions we need to answer about how Cabal will work with a GHC that
uses dynamic libraries by default. We would like to make these as soon
as possible, so that GHC 7.6.2 can ship with a Cabal that works
correctly. The various issues are described in a wiki page here:
http://hackage.haskell.org/trac/ghc/wiki/DynamicByDefault Thanks for doing all the experiments and putting this page together, it
certainly helps us to make a more informed decision. If you have a few minutes to read it then we'd be glad to hear your
feedback, to help us in making our decisions My personal opinion is that we should switch to dynamic-by-default on
all x86_64 platforms, and OS X x86. The performance penalty for x86/Linux
is too high (30%), and there are fewer bugs affecting the linker on that Simon Marlow I am slightly concerned about the GC overhead on x86_64/Linux (8%), but I think the benefits outweigh the penalty there, and I can probably
investigate to find out where the overhead is coming from. I agree with your opinion. Firstly, correctness is more important than performance. (It's Haskell,
after all.) Secondly, the RTS linker is an unnecessary time sink, and
developer cycles are precious. Thirdly, when shipping production systems,
people can always link statically to get best performance. Manuel _______________________________________________
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