- Glasgow-haskell-users

hs-plugins -- simple example fails
by Peter Collingbourne 22 Feb '08

22 Feb '08

Hello, I'm having problems trying to use hs-plugins (the darcs version, as I am on a 64-bit machine). The test suite mostly works without problems, but I can't get my own code to work. I put together a simple example which illustrates my problem: Main.hs ==================== module Main (Tree(..), Interface(..), main) where import Ptr import System.Plugins data Tree = Tree (Ptr Tree) data Interface = Interface { processTree :: Ptr Tree -> IO (Ptr Tree) } main = load "XYZuse.o" ["."] [] "resource" >>= (\(LoadSuccess _ v) -> (processTree v nullPtr)) ==================== XYZuse.hs ==================== module XYZuse (resource) where import Main resource = Interface { processTree = return } ==================== This is the output I get: ==================== $ ghc -c -o Main.o Main.hs $ ghc -c -o XYZuse.o XYZuse.hs $ ghci ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.6, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. Prelude> :l Main Ok, modules loaded: Main. Prelude Main> main Loading package Cabal-1.1.6 ... linking ... done. Loading package haskell98 ... linking ... done. Loading package haskell-src-1.0 ... linking ... done. Loading package plugins-1.0 ... linking ... done. GHCi runtime linker: fatal error: I found a duplicate definition for symbol Main_processTree_closure whilst processing object file ./Main.o This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry. ==================== Thanks, -- Peter

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Recursion over lists
by TOPE KAREM 22 Feb '08

22 Feb '08

Hello everyone, I am just learning to program in Haskell, and I found recursion very interesting. However, I need to write a recursive function over two lists. The function must check the elements in the two lists and return an element that is common to both lists if there is any. Any assistance would be appreciated. Thank you.

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ANN: Mac installer pkg for GHC - 6.8.2.20080211 trial release (Leopard, Intel)
by Manuel M T Chakravarty 20 Feb '08

20 Feb '08

Ladies and Gentlemen, Finally, you can have the glorious GHC in a format satisfying the discerning Mac user: http://www.cse.unsw.edu.au/~chak/haskell/GHC-6.8.2.20080211-i386.pkg Installation instructions: nil This is *not* the same compiler as in the official 6.8.2 release. It is the state of the 6.8 branch at the 11th of February - hence, the funny version number. Once, 6.8.3 is being released, there'll be a clean release package. The package includes all extra libraries and full documentation. It installs GHC systemwide and requires an admin password. Happy Installing! Manuel -=- Extra details for the curious -=- GHC is being packaged as a framework bundle - GHC.framework - that is installed in /Library/Frameworks/. As far as I can tell this is the most appropriate way of bundling a compiler environment on the Mac. Frameworks are versioned and we use GHC's integer version number to assign framework versions - ie, the present package installs version 608. This is in line with Apple's recommendation to use version numbers that signify API changes for frameworks. The package installs appropriate links in /usr/bin, /usr/man/man1, and /usr/share/doc to make the binaries, ghc manpage, and html documentation easily accessible. Furthermore, it comes with a shell script that removes the GHC.framework and all symbolic links into the framework. The framework is currently not relocatable and an admin password is needed to install it. Contributions improving this situation would be most welcome. The GHC binary in the package links statically against GNU readline (to provide editing capabilities at the GHCi prompt). This is fine as GHC's BSD3 licence is compatible with readline's GPL, and it does *not* affect programs compiled with GHC at all. The above package is for Intel Leopard. I expect that a separate PPC version is easy to build (but cross-compilation and fat binaries are not supported by GHC). I am less sure about building packages on Tiger as I don't know whether the underlying Xcode project requires Xcode 3.0 - Tiger only has 2.5. However, it should be possible to build packages on Leopard that run on both Tiger and Leopard. (I could give that a try if anybody with a Tiger box is willing to play guinea pig.) Further information on GHC installer packages as well as instructions on how to build your own are at http://hackage.haskell.org/trac/ghc/wiki/Building/MacOSX/Installer

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ghc-6.8.1 on WinXP: windres: can't open font file `for'
by Bayley, Alistair 20 Feb '08

20 Feb '08

I've just installed ghc-6.8.1 on my WinXP workstation (I already have it successfully working on my laptop). When I compile anything, the linking stage fails with: c:\ghc\ghc-6.8.1\bin/windres: can't open font file `for': No such file or directory Any clues as to what's wrong? Google isn't very helpful... (I've stripped my path back to just windows, windows\system32, and ghc, but no joy). Alistair P.S. output from ghc -v3 (trimmed): Linking Main.exe ... *** Windres: c:\ghc\ghc-6.8.1\bin/windres --preprocessor=c:\ghc\ghc-6.8.1\gcc -Bc:\ghc\ghc-6.8.1\gcc-lib/ -E -xc -DRC_INVOKED --input=C:/DOCUME~1/bayleya/LOCALS~1/Temp/ghc1480_0/ghc1480_0.rc --output=C:/DOCUME~1/bayleya/LOCALS~1/Temp/ghc1480_0/ghc1480_0.o --output-format=coff c:\ghc\ghc-6.8.1\bin/windres: can't open font file `for': No such file or directory The .rc file it is given contains: 1 24 MOVEABLE PURE "Main.exe.manifest" so this "... font file 'for':..." message is a puzzle. ***************************************************************** Confidentiality Note: The information contained in this message, and any attachments, may contain confidential and/or privileged material. It is intended solely for the person(s) or entity to which it is addressed. Any review, retransmission, dissemination, or taking of any action in reliance upon this information by persons or entities other than the intended recipient(s) is prohibited. If you received this in error, please contact the sender and delete the material from any computer. *****************************************************************

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GHC build failures on Mac OS X Leopard: ppc & x86
by Sean Leather 20 Feb '08

20 Feb '08

Hi, I tried to build GHC "stable" on my two computers, a PowerBook G4 and a MacBook, both running 10.5.2. This is the first time I've ever tried, so I'm somewhat clueless about a lot of it. I went with the basic instructions (./configure; make) with no 'mk/build.mk' and no configure options other than '--prefix'. On each system, I ran into a different error, though both point to the linker, 'ld'. The PowerBook failure looks similar to ticket #1958 [1]; however, it doesn't appear to be building parsec at that point. I gather that it's building stage1 due to the "-o stage1/ghc-6.8.2.20080213". The MacBook build apparently completed stage1 and failed in trying to build stage2 (i.e. "-o stage2/ghc-inplace"). I have included snippets below from the output of each build. I thought it might be useful to share and see if these are already known problems with/without workarounds. Also, I'm willing to help debug/test if there's anything specific you want me to try. Otherwise, I'll probably fiddle with the 'mk/build.mk' (as discussed in [1] and [2]) and/or changing which linker is used. Additionally, I have a somewhat unrelated question. What's the different between ghc-stable [3] and ghc-6.8 [4]? Thanks, Sean [1] http://hackage.haskell.org/trac/ghc/ticket/1958 [2] http://hackage.haskell.org/trac/ghc/wiki/Building/Hacking [3] http://darcs.haskell.org/ghc-stable/ [4] http://darcs.haskell.org/ghc-6.8/ ------------------------------------------------ PPC build output ------------------------------------------------ /usr/local/ghc-6.8.2-ppc-tiger/bin/ghc -o stage1/ghc-6.8.2.20080213 -H16m -O -istage1/utils -istage1/basicTypes -istage1/types -istage1/hsSyn -istage1/prelude -istage1/rename -istage1/typecheck -istage1/deSugar -istage1/coreSyn -istage1/vectorise -istage1/specialise -istage1/simplCore -istage1/stranal -istage1/stgSyn -istage1/simplStg -istage1/codeGen -istage1/main -istage1/profiling -istage1/parser -istage1/cprAnalysis -istage1/ndpFlatten -istage1/iface -istage1/cmm -istage1/nativeGen -Wall -fno-warn-name-shadowing -fno-warn-orphans -Istage1 -cpp -fglasgow-exts -fno-generics -Rghc-timing -I. -Iparser -package unix -ignore-package lang -recomp -Rghc-timing -H16M '-#include "cutils.h"' -DUSING_COMPAT -i../compat -ignore-package Cabal -package directory -package pretty -package containers -L../compat -lghccompat -no-link-chk stage1/basicTypes/BasicTypes.o stage1/basicTypes/DataCon.o <snip> collect2: ld terminated with signal 10 [Bus error] <<ghc: 28298448 bytes, 7 GCs, 507904/774144 avg/max bytes residency (2 samples), 16M in use, 0.01 INIT (0.00 elapsed), 0.12 MUT (19.61 elapsed), 0.06 GC (0.15 elapsed) :ghc>> make[1]: *** [stage1/ghc-6.8.2.20080213] Error 1 make: *** [stage1] Error 1 ------------------------------------------------ x86 build output ------------------------------------------------ ../compiler/stage1/ghc-inplace -no-user-package-conf -cpp stage2/ghc-inplace.c -o stage2/ghc-inplace ld: in /Users/leather/Projects/ghc-stable/ghc/libraries/haskell98/dist/build/libHShaskell98-1.0.1.0.a, archive has no table of contents collect2: ld returned 1 exit status make[2]: *** [stage2/ghc-inplace] Error 1 make[1]: *** [stage2] Error 2 make: *** [bootstrap2] Error 2

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Re: [Haskell-cafe] Re: a help for install
by Wolfgang Jeltsch 19 Feb '08

19 Feb '08

Am Dienstag, 19. Februar 2008 11:36 schrieb Wolfgang Jeltsch: > Am Montag, 18. Februar 2008 19:46 schrieb Carlos Gomez A.: > > hi, my name is carlos > > > > I need information for correct install or > > > > what are dependencies on ghc ? > > > > I have a Debian System. > > Always use your distribution’s packages until they aren’t any or there is > good reason not to do so. Try “aptitude install ghc6”. > > Best wishes, > Wolfgang Sorry, this should go to glasgow-haskell-users(a)haskell.org. :-( Best wishes, Wolfgang

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a help for install
by Carlos Gomez A. 18 Feb '08

18 Feb '08

hi, my name is carlos I need information for correct install or what are dependencies on ghc ? I have a Debian System. I have this message error to install the ghc: Debian-System/haskell/ghc-6.8.2# ./configure checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking target system type... i686-pc-linux-gnu Canonicalised to: i386-unknown-linux checking for ghc... no checking for ghc-pkg matching ... no checking for ghc-pkg... no checking whether ghc has readline package... no checking for nhc... no checking for nhc98... no checking for hbc... no checking for ld... /usr/bin/ld configure: error: GHC is required unless bootstrapping from .hc files. Debian-System/haskell/ghc-6.8.2# --------------------------------- ¡Capacidad ilimitada de almacenamiento en tu correo! No te preocupes más por el espacio de tu cuenta con Correo Yahoo!: http://correo.yahoo.com.mx/

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ghci feature request: partially read modules
by Johannes Waldmann 18 Feb '08

18 Feb '08

Hello. Here is one ghci feature that I find mildly annoying: If ghci (re-)reads a module that contains some error, then it considers the module loading as a complete failure, and at the prompt I get the Prelude environment. I'd like to have at least the import statements executed, and possibly the declarations that were error-free. That would help me in interactively debugging the erraneous part of the module. (Often the error is some type error, related to some imported entity; but when my module contains the error, then the imports are gone.) Perhaps I'm doing something wrong, then please educate me; or perhaps there's an easy way to implement partial reading and typechecking. (It'd be enough to have this for the "current" module, of course.) Thanks - Johannes Waldmann.

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statically linking
by Martina Seidl 17 Feb '08

17 Feb '08

Hallo, I urgently need a statically linked binary (ELF 32) of a Haskell program I have written and I could not figure out yet how to achieve this. Could anyone give me a hint please? Best regards, Martina

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slightly modified hasktags version / Who can commit it?
by Marc Weber 17 Feb '08

17 Feb '08

I've hacked on hasktags again http://mawercer.de/hasktags.hs I'd like to merge changes into the ghc distribution or ask someone to do so. changes: a) full qualified module names are added as well now b) hack: removed empty tokens so that getcons finds [..] rqBody :: RqBody, [..] c) ctag files are sorted now testcase : ============= ======================================================= -- module name should be found module A.B.testcase where -- Request, Request2 -- rqMethod, rqBody, rqPeer should be found as well data Request = Request2 { rqMethod::Method, rqBody :: RqBody, rqPeer :: Host } deriving(Show,Read,Typeable) ============= ======================================================= hasktags distributed with ghc (6.8.2): Request testcase.hs 6 Request2 testcase.hs 6 rqMethod testcase.hs 6 testcase.hs 7 <<< name is missing testcase.hs 8 <<< name is missing my modified version: A.B.testcase testcase.hs 2 <<< module name added Request2 testcase.hs 6 Request testcase.hs 6 rqMethod testcase.hs 6 rqBody testcase.hs 7 rqPeer testcase.hs 8

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