November 2006 - Hat - Haskell.org

Program Compiles With GHC 6.6 but not Hat
by Aditya Siram 19 Nov '06

19 Nov '06

The following program compiles and runs on GHC 6.6 but fails to compile with the '-hat' option to hmake. The error message is: **Begin Output** hat-trans HatTest.hs Wrote Hat/HatTest.hs ghc-6.6 -c -package hat -o Hat/HatTest.o Hat/HatTest.hs Hat/HatTest.hs:40:50: Ambiguous type variable `a' in the constraint: `Integral a' arising from use of `htakeodds' at Hat/HatTest.hs:40:50-58 Probable fix: add a type signature that fixes these type variable(s) **End Output** The program source is: import Prelude takeodds xs = [ x | x <- xs, (mod x 2) ==0] main = do { print (takeodds [1 ..7]); } Thanks... Deech _________________________________________________________________ Talk now to your Hotmail contacts with Windows Live Messenger. http://clk.atdmt.com/MSN/go/msnnkwme0020000001msn/direct/01/?href=http://ge…

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Hat-Observe N+M Counter?
by Maik Barz 17 Nov '06

17 Nov '06

Hi, I am wondering if there's no more M+N Counter. In the documentation is an explanation that it shows the number of evaluated and nonevaluated functions when using :info. Is there an option to set this option? I am using hat 2.04 Maik -- Maik Barz Wilhelmplatz 4 - 24116 Kiel www.Barzille.de

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Re: [Haskell-cafe] Newbie; Can't Install Hat From Source
by Malcolm Wallace 16 Nov '06

16 Nov '06

"Aditya Siram" <aditya_siram(a)hotmail.com> wrote: > I have been trying to install Hat for the last couple of days but GHC > does not recognize it as a package. I compiled 2.05 from source, but > at the 'make install' step I see this error message: > > Installing hat package for ghc under > /usr/local/lib/hat-2.05/ix86-Linux/ghc-606 > ghc-pkg: cannot find package hat <-----ERROR MESSAGE!!!!! This error message can be safely ignored - it comes from a requirement to support several different versions of ghc, each of which has a different interface to the package manager ghc-pkg. > ghc-pkg: package hat-2.4 is already installed > > /usr/local/lib/ghc-6.6/package.conf: > ... > /home/deech/.ghc/i386-linux-6.6/package.conf: > (hat-2.4) <----ERROR!!! > > For some reason it thinks that hat-2.4 is installed. This is one of a couple of bugs in the 2.05 package. The .cabal file simply had the wrong version number in it. > Bad interface file: > /usr/local/imports/hat-2.05/ghc-606/Hat/PreludeBasic.hi > Something is amiss; requested module hat-2.4:Hat.PreludeBasic > differs from name found in the interface file hat:Hat.PreludeBasic And this is the other bug: the Hat library package was built using "-package-name hat" instead of "-package-name hat-2.05" (as now required by ghc-6.6 and above). I have re-rolled the Hat-2.05 distribution package with these two very minor bugfixes. Please try downloading it again, and re-building. Regards, Malcolm

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Fwd: [Haskell-cafe] Newbie; Can't Install Hat From Source
by Neil Mitchell 16 Nov '06

16 Nov '06

In case any Hat people miss this (pleaes cc Aditya) ---------- Forwarded message ---------- From: Aditya Siram <aditya_siram(a)hotmail.com> Date: Nov 16, 2006 2:00 AM Subject: [Haskell-cafe] Newbie; Can't Install Hat From Source To: haskell-cafe(a)haskell.org Hi all, I have been trying to install Hat for the last couple of days but GHC does not recognize it as a package. I compiled 2.05 from source, but at the 'make install' step I see this error message: **Begin Output** ./configure --install Configuring for hat... [ 2.05 ] Starting with earlier config in targets/ix86-Linux/config.cache [ config: ix86-Linux/ by deech@ubuntu on 15 Nov 2006 ] (but cmdline options have precedence) -------- Looking for already-installed Haskell compilers: Looking for ghc... found 6.6 Looking for nhc98... (not found) Looking for hmake... found 3.13 You said you want to use ghc to build hat. Done. -------- Configuration report for hat. You are going to build hat with: ghc Executables need .exe suffix? no (detected) Testing for the glib library: no (using slower replacement) Installation directories are now created/checked. Install directory root is: /usr/local Hat interface files (.hx) go into: /usr/local/include/hat-2.05 (exists) Array.hx ...... Debug/Trace.hx Installing hat as a ghc package: Installing hat package for ghc under /usr/local/lib/hat-2.05/ix86-Linux/ghc-606 ghc-pkg: cannot find package hat <-----ERROR MESSAGE!!!!! Reading package info from stdin ... done. ghc-pkg: package hat-2.4 is already installed Scripts go into: /usr/local/bin (exists) hat-graph hat-trans hat-tools: hat-stack hat-check hat-observe hat-detect hat-delta hat-view hat-trail hat-anim hat-explore hat-cover black-hat hat-nonterm pretty-hat Executables go into: /usr/local/lib/hat-2.05/ix86-Linux (exists) config hat-anim hat-check hat-cover hat-delta hat-detect hat-explore hat-nonterm hat-observe hat-stack hat-trail hat-trans hat-view black-hat pretty-hat Man pages go into: /usr/local/man/man1 (exists) hat-anim.1 hat-delta.1 hat-detect.1 hat-observe.1 hat-stack.1 hat-trail.1 hat-trans.1 pretty-hat.1 Not (re-)installing html documents Saving current configuration in targets/ix86-Linux/config.cache Done. Please ensure /usr/local/bin is in your PATH variable. **End Of Output** The output of 'ghc-pkg list' is: /usr/local/lib/ghc-6.6/package.conf: Cabal-1.1.6, HUnit-1.1, QuickCheck-1.0, base-2.0, cgi-2006.9.6, fgl-5.2, (ghc-6.6), haskell-src-1.0, haskell98-1.0, html-1.0, mtl-1.0, network-2.0, parsec-2.0, readline-1.0, regex-base-0.71, regex-compat-0.71, regex-posix-0.71, rts-1.0, stm-2.0, template-haskell-2.0, time-1.0, unix-1.0, xhtml-2006.9.13 /home/deech/.ghc/i386-linux-6.6/package.conf: (hat-2.4) <----ERROR!!! For some reason it thinks that hat-2.4 is installed. I tried to run a test program saved in HatTest.hs: import Prelude main = do { print "Hello"; } When I compile it with 'hmake -hat HatTest' I get the following error: hat-trans HatTest.hs Wrote Hat/HatTest.hs ghc-6.6 -c -package hat -o Hat/HatTest.o Hat/HatTest.hs Hat/HatTest.hs:3:0: Bad interface file: /usr/local/imports/hat-2.05/ghc-606/Hat/PreludeBasic.hi Something is amiss; requested module hat-2.4:Hat.PreludeBasic differs from name found in the interface file hat:Hat.PreludeBasic I'm not really sure how to proceed. Any help is appreciated. BTW I get the ghc-package: cannot find package hat when I 'apt-get install' it too. Thanks.. Deech _________________________________________________________________ View Athlete's Collections with Live Search http://sportmaps.live.com/index.html?source=hmemailtaglinenov06&FORM=MGAC01 _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe(a)haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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How does the FFI work?
by Thomas Davie 13 Nov '06

13 Nov '06

I'm having problems with the FFI and GHC 6.6. Namely, I edited one of the tools files (Detect.hs) that contains FFI imports, and now I end up with generalised death when I try to compile. The source compiles fine, but on linking I get: /usr/bin/ld: Undefined symbols: _anySuspect _extendParentSet _findMainUse _newParentSet _nextChild The C and H files are hanging around as they should be. Any ideas what's going on? Bob

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Hat hasn't installed properly
by Thomas Davie 06 Nov '06

06 Nov '06

Something's up with hat-2.05 on my system. It hasn't installed its package correctly. ./configure, make, sudo make install reported no errors, but trying to build using 'hmake -hat' produces this error: hat-trans goodFib.hs Creating directories Hat Wrote Hat/goodFib.hs ghc -c -package hat -o Hat/goodFib.o Hat/goodFib.hs ghc-6.6: unknown package: hat Running ghc-pkg list reveals that no such package is installed: LappyBob:~/Documents/Work/Hat test cases/goodFib tatd2$ ghc-pkg list /usr/local/lib/ghc-6.6/package.conf: Cabal-1.1.6, GLUT-2.0, HGL-3.1, HUnit-1.1, OpenGL-2.1, QuickCheck-1.0, X11-1.1, base-2.0, cgi-2006.9.6, fgl-5.2, (ghc-6.6), haskell-src-1.0, haskell98-1.0, html-1.0, mtl-1.0, network-2.0, parsec-2.0, readline-1.0, regex-base-0.71, regex-compat-0.71, regex-posix-0.71, rts-1.0, stm-2.0, template-haskell-2.0, time-1.0, unix-1.0, xhtml-2006.9.13 Any ideas why the package isn't getting installed correctly? Bob

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