moving from ghc-6.2 to 6.4
waldmann at imn.htwk-leipzig.de
Tue Mar 29 02:58:38 EST 2005
I am trying to bring a larger heap of code (http://126.96.36.199/auto/ )
into 6.4 land (because of wonder stories about faster compilation,
faster execution, Data.Map, and so on ...)
Here are a few observations and questions
that may be useful to others as well.
* what is the situation with ghc-6.4 for sparc/solaris?
I don't see a binary package in the download area.
I started to build from source - can this be successful?
(The rest of this report refers to i386/linux)
* Cabal is very nice! - The only thing that was confusing me
is that I have to list all modules in the *.cabal file:
if I don't, it still happily builds and installs the package
but it cannot be used, giving linker errors. Couldn't this be
checked earlier? Or better, couldn't it infer the needed
hidden modules? Anyway I can generate the module list by a shell
script but that does not feel right. - How do I build and install
a profiling version of a package, how does Cabal support this?
* (when building HSQL-1.4) CTime is no longer an instance of Integral,
so I replaced fromIntegral by fromIntegral . fromEnum, is this OK?
* the name of mkAppTy changed to mkTyConApp
(I hope it's only the name that changed)
* I don't see "dramatic" improvements in execution times -
are there some magic ghc options I missed? I used -O -fvia-C.
Still, executables are maybe 2 .. 5 % smaller and faster than they
were with 6.2 - and compilation without -O is really fast.
Best regards, and thanks to the GHC team.
-- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 --
---- http://www.imn.htwk-leipzig.de/~waldmann/ -------
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