April 2002 - Glasgow-haskell-users

RE: handling of multibyte char strings
by Simon Marlow 18 Apr '02

18 Apr '02

> GHC 5.02.[23] seems to be quite strict about literal strings > in source code. I presume this is a feature. :-) However > this is annoying for people who want to use wide chars in > strings in source code. (Though I realise that doing so is > not very "portable".) > > To illustrate, the following program > > main :: IO () > main = > let ja = 'Japanese character' in putChar ja >> putChar '\n' > > results in > > Compiling Main ( test-ja.hs, interpreted ) > test-ja.hs:3: error in character literal > Failed, modules loaded: none. > > with both ghc and ghci. As other folk noted, you should be fine with ISO8859-1 characters but we don't have support for Unicode yet. There has been discussion at various points in the past on how to do this, and Marcin Kowalczyk has some ideas on how the Haskell interface to multi-coded text I/O should look. It is possible that we could just support UTF-8 in source files without going the whole hog and providing Unicode I/O, however. As usual, contributions are welcome :-) Cheers, Simon

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Heap profiling
by ketil＠ii.uib.no 18 Apr '02

18 Apr '02

Hi, I really like the profiling options in GHC, but I wonder if there's any good way of improving heap profiling speed? I've tried using -i to reduce the number of measurements, but it didn't seem to help a lot. I see an order of magnitude speed degradation with heap profiling, which is slightly annoying, since it is with large runs heap consumption starts to become troublesome :-) Any tricks I ought to know about? -kzm -- If I haven't seen further, it is by standing in the footprints of giants

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Re: ghc-pkg info
by Ashley Yakeley 18 Apr '02

18 Apr '02

At 2002-04-18 02:37, Wolfgang Thaller wrote: >Those shell scripts were installed by a standard make install, so I >expect them to be there for any platform - it has nothing to do with >MacOS X. Must be a new thing in the source. Your previous port of 5.03 had symlinks there. -- Ashley Yakeley, Seattle WA

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ghc-pkg info
by Ashley Yakeley 18 Apr '02

18 Apr '02

It would be nice if ghc-pkg had options to display the value of $libdir or at least the given conf file. I'm trying to get my Autotools configure script to find Rts.h, and it's a bit of a pain. My current approach is to use "readlink -f `which ghc`" and get it from there, but that fails with the latest MacOS X version because it uses small shell scripts in unusual places instead of symlinks. -- Ashley Yakeley, Seattle WA

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Re: New Patches & Binary for MacOS X
by Ashley Yakeley 18 Apr '02

18 Apr '02

At 2002-04-15 12:29, Wolfgang Thaller wrote: >The binary package for MacOS X is now available at >http://www.kfunigraz.ac.at/imawww/haskell/GHC.dmg It fails to build TypedObject.hs. $ /usr/local/bin/ghc -fvia-C -pgmccc -pgmacc -package lang -package concurrent -fglasgow-exts -fallow-undecidable-instances -package-name javavm -c TypedObject.hs -o TypedObject.o +RTS -K20m stack overflow: use +RTS -K<size> to increase it TypedObject.hs is this: <http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/jvm-bridge/sourc e/Haskell/TypedObject.hs?rev=1.6> Actually, what I recommend you do is fetch JVM-Bridge from CVS and build it yourself. It's quite straightforward. Go here to find it: <http://sourceforge.net/cvs/?group_id=32318> Follow the instructions in "source/Building". -- Ashley Yakeley, Seattle WA

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Re: New Patches & Binary for MacOS X
by Ashley Yakeley 18 Apr '02

18 Apr '02

At 2002-04-15 12:29, Wolfgang Thaller wrote: >The binary package for MacOS X is now available at >http://www.kfunigraz.ac.at/imawww/haskell/GHC.dmg It won't run without this file: /usr/local/lib/libdl.0.dylib As it happens, I have it (dlcompat), but not there. -- Ashley Yakeley, Seattle WA

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parfib suite for ghc 0.29
by Hal Daume III 17 Apr '02

17 Apr '02

Anyone know where I can find this? I downloaded all the ghc0.29 packages and can't seem to find it anywhere. -- Hal Daume III "Computer science is no more about computers | hdaume(a)isi.edu than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume

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RE: ghc-5.02.2-i386-unknown-linux.tar.bz2
by Byron Hale 17 Apr '02

17 Apr '02

At 12:58 PM 4/8/2002 -0700, you wrote: At 11:40 AM 4/8/2002 +0100, you wrote: > I downloaded and installed ghc-5.02.2-i386-unknown-linux.tar.bz2 on my > RedHat Linux 6.2 box. > However, when I run "ghci," I get the message ... "GHC ... > 5.02.1" ... ghc-5.02.3-i386-unknown-linux.tar.bz2 from haskell.org installed and runs on the above platform, so anyone having problems installing 5.02.2 on this platform could fix that problem with an upgrade to 5.02.3. Thanks to Serge and Simon for their help. Best Regards, Byron Hale byron.hale(a)einfo.com

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Bug?
by Jorge Adriano 17 Apr '02

17 Apr '02

[1] Bug1? This declaration: > A = (,) Int Int is accepted by ghci. Is this behaveour correct, 1. It kind of shadows (,) is defined in PrelTup meaning that you can no longer use (,) prefix to refer to tuples - like (,) 1 2. 2. Seems to me like (,) is not correct syntax for a consym as defined in the H98 Report so we shouldn't be able to redefine it. Note: didn't check any other interpreter/compiler. [2] Bug2? - Step 1 Load this in ghci, ----------------------- module Test where data C = C ((,) Int Int) data A = (,) !Int !Int h :: A h = (,) 1 2 {- f :: C f = C ((,) 3 4) -} ------------------------ - Step 2 Uncomment the f function. (you'll get an error function) - Step 3 To get rid of the error comment out the 'data A' declaration and function 'h'. Now you should get this error message: ------------------------------------------------- Failed to find interface decl for `Teste.A' from module `Teste' ------------------------------------------------- [3] Strict Pairs question I really miss them :-) I know I can do something like data A a b= A !a !b But then you can't use zips fst etc etc... One possible solution would be to add some Class Pair, with default instances for these functions. Is this a bad idea for any particular reason? It would also be nice to be able to generalize the idea syntatic sugar for standar tuples and be able to define constructors like, say (:,:) and (#:, , :#) etc. Is this feasable? J.A.

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RE: ANNOUNCE: GHC 5.03.20020410 snapshot released
by Simon Marlow 17 Apr '02

17 Apr '02

> Another snapshot along the 5.03 line, we expect this to be the last > snapshot before 5.04. As before, there are NO GUARANTEES as to the > stability of this release, but it has passed our three-stage bootstrap > and all but one(!) of the 754 regressions tests passed. > Documentation is > also still lagging behind the new features. > > Get it from the usual place: > > http://www.haskell.org/ghc/ The snapshot source distribution has now been updated to include the file mk/package.mk which was missing the first time around. Cheers, Simon

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