- Glasgow-haskell-users

"ld" memory usage
by Roman Beslik 19 Apr '10

19 Apr '10

Hi. This is not strictly a GHC question. I observed that "ld" when linking GHC-compiled programs eats 0.5 GB of resident memory. ~3 times more than GHC or Haddock. So if there is not enough free memory "ld" uses virtual memory and works very slowly (practically does not use CPU). I'd like to know, is anyone interested in researching and improving memory usage? Is it "ld" or GHC problem? I found a similar discussion here http://article.gmane.org/gmane.comp.lang.haskell.cafe/66189 but it was too broad and went nowhere. -- Best regards, Roman Beslik.

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Literate files in the GHC source
by Tyson Whitehead 18 Apr '10

18 Apr '10

I'm just wondering how exactly are the literate files in the GHC source suppose to be treated. I would like to read some of the documentation. The presence of various latex commands such as subsection strongly suggests they are done in latex. Running pdflatex, however, doesn't work. Nor does created a wrapper latex file to define the document class, the code environment, etc., as it then bombs out on such things as non-escaped '#'s. I searched around on the Internet and mailing list archives didn't seem to find anything. If I had to guess, I would suspect it started as actually latex documentation, but has fallen into a state of disrepair. Is this correct? Thanks! -Tyson

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Re: Can't install Criterion package on ghc ..
by John Lato 17 Apr '10

17 Apr '10

> From: Mozhgan kabiri <mozhgan.kabiri(a)gmail.com> > > Hi, > > I am trying to install Criterion package, but I keep getting an error and I > can't figure it out why it is like this !! > > mozhgan@Mozhgan-KCh:~$ cabal install Criterion > Resolving dependencies... > Configuring vector-algorithms-0.3... > Preprocessing library vector-algorithms-0.3... > Building vector-algorithms-0.3... ... > [8 of 9] Compiling Data.Vector.Algorithms.Intro ( > Data/Vector/Algorithms/Intro.hs, dist/build/Data/Vector/Algorithms/Intro.o ) > ghc: panic! (the 'impossible' happened) > (GHC version 6.10.4 for i386-unknown-linux): > idInfo co{v a9WB} [tv] This is definitely a bug in GHC, most likely related to type families and fixed in GHC-6.12.x If you can upgrade to ghc-6.12.1, that should solve this problem. If you need to remain on ghc-6.10.4, try installing an older version of criterion. You can do this with 'cabal install criterion-0.4.1.0' Criterion-0.5 is the first version to depend upon vector-algorithms, so any previous version has a chance of working. John

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Using -fext-core without a Main function
by Hal Daume III 17 Apr '10

17 Apr '10

If I have a file 'Foo.hs' that contains one line 'addOne x = x + 1', I want to run something like: ghc -c -fext-core Foo.hs to get the core version of this file. Unfortunately, when I do that, it complains that Main doesn't have a function main. And it doesn't produce the .hcr file. I tried adding -no-hs-main but that doesn't help. I can add 'main = undefined' to Foo.hs, but then the core file doesn't contain the declaration of addOne because it's not used. Any suggestions? Thanks! -h -- Hal Daume III --- me AT hal3 DOT name | http://www DOT hal3 DOT name "Arrest this man, he talks in maths." | http://nlpers.blogspot.com

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ANNOUNCE: GHC 6.12.2 Release Candidate 1
by Ian Lynagh 16 Apr '10

16 Apr '10

Hi all, We are pleased to announce the first release candidate for GHC 6.12.2: http://www.haskell.org/ghc/dist/6.12.2-rc1/ As well as the source tarball: ghc-6.12.1.20100330-src.tar.bz2 there are installers for Windows (i386) and OS X (i386), and binary distributions for x86_64/Linux and i386/Linux. Please test as much as possible; bugs are much cheaper if we find them before the release! Thanks Ian, on behalf of the GHC team

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interaction of GADTs and data families: a bug?
by Sebastian Fischer 16 Apr '10

16 Apr '10

Dear GHC experts, Certain behaviour when using {-# LANGUAGE GADTs, TypeFamilies #-} surprises me. The following is accepted by GHC 6.12.1: data GADT a where BoolGADT :: GADT Bool foo :: GADT a -> a -> Int foo BoolGADT True = 42 But the following is not: data family DataFam a data instance DataFam Bool where BoolDataFam :: DataFam Bool fffuuuu :: DataFam a -> a -> Int fffuuuu BoolDataFam True = 42 GHC 6.12.1 throws the following error (GHC 6.10.4 panics): Couldn't match expected type `a' against inferred type `Bool' `a' is a rigid type variable bound by the type signature for `fffuuuu' at gadtDataFam.hs:13:19 In the pattern: BoolDataFam In the definition of `fffuuuu': fffuuuu BoolDataFam True = 42 I expect that `fffuuuu` should be accepted just like `foo`. Do I expect too much? Cheers, Sebastian -- Underestimating the novelty of the future is a time-honored tradition. (D.G.)

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Advice on Multiple GHC installations
by Bradford Larsen 16 Apr '10

16 Apr '10

I would like to have several versions of ghc installed simultaneously, on the handful of Ubuntu systems I work on. In the past, I have had just a single version of ghc installed on each system, usually the most recent stable generic Linux binary installation. Three questions: 1. Does there exist an `experimental' apt repository for Ubuntu anywhere which packages versions of ghc more recent than 6.8? 2. If I cannot install multiple ghc versions from a different apt repository, does anyone have advice for how to work with multiple simultaneous installations? A how-to guide or anything like that? 3. Does having multiple installations break cabal at all? I'd like to be able to use ghc 6.12.* by default, but be able to selectively choose an older toolchain for compatibility purposes, bug hunting, etc. Thanks! Sincerely, Brad

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testing 6.12.2-pre
by Serge D. Mechveliani 15 Apr '10

15 Apr '10

Dear GHC developers, I have tested ghc-6.12.1.20100330 on Debian Linux, i386-family, on the DoCon test, without profilig. It looks all right. ----------------- Serge Mechveliani mechvel(a)botik.ru

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Can't install Criterion package on ghc ..
by Mozhgan kabiri 13 Apr '10

13 Apr '10

Hi, I am trying to install Criterion package, but I keep getting an error and I can't figure it out why it is like this !! mozhgan@Mozhgan-KCh:~$ cabal install Criterion Resolving dependencies... Configuring vector-algorithms-0.3... Preprocessing library vector-algorithms-0.3... Building vector-algorithms-0.3... [1 of 9] Compiling Data.Vector.Algorithms.Common ( Data/Vector/Algorithms/Common. hs, dist/build/Data/Vector/Algorithms/Common.o ) [2 of 9] Compiling Data.Vector.Algorithms.Search ( Data/Vector/Algorithms/Search.hs, dist/build/Data/Vector/Algorithms/Search.o ) [3 of 9] Compiling Data.Vector.Algorithms.Radix ( Data/Vector/Algorithms/Radix.hs, dist/build/Data/Vector/Algorithms/Radix.o ) [4 of 9] Compiling Data.Vector.Algorithms.Optimal ( Data/Vector/Algorithms/Optimal.hs, dist/build/Data/Vector/Algorithms/Optimal.o ) [5 of 9] Compiling Data.Vector.Algorithms.Insertion ( Data/Vector/Algorithms/Insertion.hs, dist/build/Data/Vector/Algorithms/Insertion.o ) [6 of 9] Compiling Data.Vector.Algorithms.Merge ( Data/Vector/Algorithms/Merge.hs, dist/build/Data/Vector/Algorithms/Merge.o ) [7 of 9] Compiling Data.Vector.Algorithms.TriHeap ( Data/Vector/Algorithms/TriHeap.hs, dist/build/Data/Vector/Algorithms/TriHeap.o ) [8 of 9] Compiling Data.Vector.Algorithms.Intro ( Data/Vector/Algorithms/Intro.hs, dist/build/Data/Vector/Algorithms/Intro.o ) ghc: panic! (the 'impossible' happened) (GHC version 6.10.4 for i386-unknown-linux): idInfo co{v a9WB} [tv] Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug cabal: Error: some packages failed to install: criterion-0.5.0.0 depends on vector-algorithms-0.3 which failed to install. statistics-0.5.1.0 depends on vector-algorithms-0.3 which failed to install. vector-algorithms-0.3 failed during the building phase. The exception was: exit: ExitFailure 1 I tried to install Statistics and vector-algorithms package separately before installing the Criterion package itself .. but it wasn't successful. Thanks, Mozhgan

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Can't install Criterion package on ghc ..
by Mozhgan kabiri 13 Apr '10

13 Apr '10

Hi, I am trying to install Criterion package, but I keep getting an error and I can't figure it out why it is like this !! mozhgan@Mozhgan-KCh:~$ cabal install Criterion Resolving dependencies... Configuring vector-algorithms-0.3... Preprocessing library vector-algorithms-0.3... Building vector-algorithms-0.3... [1 of 9] Compiling Data.Vector.Algorithms.Common ( Data/Vector/Algorithms/Common.hs, dist/build/Data/Vector/Algorithms/Common.o ) [2 of 9] Compiling Data.Vector.Algorithms.Search ( Data/Vector/Algorithms/Search.hs, dist/build/Data/Vector/Algorithms/Search.o ) [3 of 9] Compiling Data.Vector.Algorithms.Radix ( Data/Vector/Algorithms/Radix.hs, dist/build/Data/Vector/Algorithms/Radix.o ) [4 of 9] Compiling Data.Vector.Algorithms.Optimal ( Data/Vector/Algorithms/Optimal.hs, dist/build/Data/Vector/Algorithms/Optimal.o ) [5 of 9] Compiling Data.Vector.Algorithms.Insertion ( Data/Vector/Algorithms/Insertion.hs, dist/build/Data/Vector/Algorithms/Insertion.o ) [6 of 9] Compiling Data.Vector.Algorithms.Merge ( Data/Vector/Algorithms/Merge.hs, dist/build/Data/Vector/Algorithms/Merge.o ) [7 of 9] Compiling Data.Vector.Algorithms.TriHeap ( Data/Vector/Algorithms/TriHeap.hs, dist/build/Data/Vector/Algorithms/TriHeap.o ) [8 of 9] Compiling Data.Vector.Algorithms.Intro ( Data/Vector/Algorithms/Intro.hs, dist/build/Data/Vector/Algorithms/Intro.o ) ghc: panic! (the 'impossible' happened) (GHC version 6.10.4 for i386-unknown-linux): idInfo co{v a9WB} [tv] Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug cabal: Error: some packages failed to install: criterion-0.5.0.0 depends on vector-algorithms-0.3 which failed to install. statistics-0.5.1.0 depends on vector-algorithms-0.3 which failed to install. vector-algorithms-0.3 failed during the building phase. The exception was: exit: ExitFailure 1 I tried to install Statistics and vector-algorithms package separately before installing the Criterion package itself .. but it wasn't successful. Thanks, Mozhgan

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