March 2011 - Glasgow-haskell-users

a message from Tokyo
by Kazu Yamamoto 13 Mar '11

13 Mar '11

Dear GHC users and Haskell community members, I'm writing this message to tell you the situation of Japan. As you know, the biggest earthquake since 1900 occurred. North-east of Japan is now like hell. Many towns were destroyed due to Tsunami. Many fires still continue. I guess some of you have been to Sendai which is a central town of North-east of Japan. The situation of Sendai is really really bad. I'm concerning whether or not people of Tohoku University are safe. Thanks to twitter, Eijiro Sumii, who is the chair of ICPF 2011 programming contest is safe. Fortunately, Tokyo is fine. I was working at my office in Tokyo and experienced the biggest earthquake in my life. 16 years ago, I was living in a place which is 200 km away from Kobe. At the time, the earthquake was the biggest for me, of course. But this time, quake was worse than that. All trains and subways in Tokyo stopped. Some people had to stay in their companies. Some chose to walk for many hours. Some had to stay in schools which were opened to everybody. In my case, I got home by my bicycle. I could not communicate with my wife by mobile phone. But my wife walked for four hours with our son and finally got together yesterday. All members of Haskell community in Tokyo are fine. Some of them are twitting. Probably we will be able to hold a study meeting on Yesod tommorrow. I believe this earthquake will not stop ICPF 2011 since Tokyo had little damage. I hope people living in North-east Japan can go home as quickly as possible and their town will recover. If you have any questions, please tell me by e-mail or twitter(@kazu_yamamoto). And I hope you kindly pray for them. Sincerely, --Kazu

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Weird failure of ghc-7.0.2 on OS X 10.5 using the bindist tarball
by Thomas Schilling 12 Mar '11

12 Mar '11

I installed ghc (x86) from the bindist tarball like so: $ wget http://www.haskell.org/ghc/dist/7.0.2/ghc-7.0.2-i386-apple-darwin.tar.bz2 $ tar -xjf ghc-7.0.2-i386-apple-darwin.tar.bz2 $ cd ghc-7.0.2-i386-apple-darwin $ ./configure --prefix=$HOME/local $ make install $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.0.2 GHCi works fine: $ ghc -e 3+4 7 However, if I want to compile a test file I get a weird dtrace error. $ cat test.hs main = print 42 $ ghc --make test.hs [1 of 1] Compiling Main ( test.hs, test.o ) Linking test ... error: Could not compile reconstructed dtrace script: Unhandled typedefs encoding version v2 provider HaskellEvent { probe thread_wakeup(EventCapNo,EventThreadID,EventCapNo); probe thread__runnable(EventCapNo,EventThreadID); probe migrate__thread(EventCapNo,EventThreadID,EventCapNo); probe create__thread(EventCapNo,EventThreadID); probe gc__work(EventCapNo); probe gc(int, double, long,...)(EventCapNo); probe gc__done(EventCapNo); probe gc__start(EventCapNo); probe gc__end(EventCapNo); probe stop__thread(EventCapNo,EventThreadID,EventThreadStatus); probe run__thread(EventCapNo,EventThreadID); probe startup(EventCapNo); probe user__msg(EventCapNo,char *); }; #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent provider #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent module #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent function #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent name #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent args ld: error creating dtrace DOF section collect2: ld returned 1 exit status $ uname -mrsv Darwin 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 Any idea what's going on there? / Thomas -- Push the envelope. Watch it bend.

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Re: Weird failure of ghc-7.0.2 on OS X 10.5 using the bindist tarball
by Thomas Schilling 11 Mar '11

11 Mar '11

No, I have xcode installed (which is mainly needed for gcc, ar, ld, etc.). I have lots of other GHC versions installed as well, so I don't think that's the issue. I think Duncan has been working on dtrace support, so maybe he has an idea. (CC'd). On 11 March 2011 18:51, Don Stewart <dons00(a)gmail.com> wrote: > Missing XCode? Or is that not relevant? > > On Fri, Mar 11, 2011 at 10:39 AM, Thomas Schilling > <nominolo(a)googlemail.com> wrote: >> I installed ghc (x86) from the bindist tarball like so: >> >> $ wget http://www.haskell.org/ghc/dist/7.0.2/ghc-7.0.2-i386-apple-darwin.tar.bz2 >> $ tar -xjf ghc-7.0.2-i386-apple-darwin.tar.bz2 >> $ cd ghc-7.0.2-i386-apple-darwin >> $ ./configure --prefix=$HOME/local >> $ make install >> >> $ ghc --version >> The Glorious Glasgow Haskell Compilation System, version 7.0.2 >> >> GHCi works fine: >> >> $ ghc -e 3+4 >> 7 >> >> However, if I want to compile a test file I get a weird dtrace error. >> >> $ cat test.hs >> main = print 42 >> >> $ ghc --make test.hs >> [1 of 1] Compiling Main ( test.hs, test.o ) >> Linking test ... >> error: Could not compile reconstructed dtrace script: >> >> Unhandled typedefs encoding version v2 >> provider HaskellEvent { >> probe thread_wakeup(EventCapNo,EventThreadID,EventCapNo); >> probe thread__runnable(EventCapNo,EventThreadID); >> probe migrate__thread(EventCapNo,EventThreadID,EventCapNo); >> probe create__thread(EventCapNo,EventThreadID); >> probe gc__work(EventCapNo); >> probe gc(int, double, long,...)(EventCapNo); >> probe gc__done(EventCapNo); >> probe gc__start(EventCapNo); >> probe gc__end(EventCapNo); >> probe stop__thread(EventCapNo,EventThreadID,EventThreadStatus); >> probe run__thread(EventCapNo,EventThreadID); >> probe startup(EventCapNo); >> probe user__msg(EventCapNo,char *); >> }; >> >> #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent provider >> #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent module >> #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent function >> #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent name >> #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent args >> >> >> ld: error creating dtrace DOF section >> collect2: ld returned 1 exit status >> >> >> $ uname -mrsv >> Darwin 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT >> 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 >> >> Any idea what's going on there? >> >> / Thomas >> -- >> Push the envelope. Watch it bend. >> >> _______________________________________________ >> Glasgow-haskell-users mailing list >> Glasgow-haskell-users(a)haskell.org >> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users >> > -- Push the envelope. Watch it bend.

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ghc-7.0.2 on macports wanted
by Christian Maeder 11 Mar '11

11 Mar '11

Dear All, we would appreciate a ghc-7.0.2 distribution package via macports, because we intend to make macports packages based on ghc and gtk+2.0. Libraries from the Haskell-Platform would be nice, too. Was macports given up? Via "port pkg" we want to create binary mac packages, however, these packages are only very basic in that they cannot be uninstalled and do not know about their dependencies. Therefore I would also like how to create proper distribution packages. (links are welcome) Thanks Christian

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Exclusively For You
by Tim Watson 09 Mar '11

09 Mar '11

This offer is really nice, isn't it? http://www.network4dummies.com/info.html

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Exclusively For You
by Tim Watson 09 Mar '11

09 Mar '11

This is a good offer http://www.gogoamerica.com/info.html It's cool!

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big hello world binary on 32bit intel MacOS
by Christian Maeder 09 Mar '11

09 Mar '11

Hi, compiling a simple putStrLn "Hello" program creates binaries of size: ghc-6.12.3: 719K ghc-7.0.1: 7,4M ghc-7.0.2: 6,9M "otool -L" for the ghc-7 binaries displays: /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.4) /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) where /usr/lib/libgcc_s.1.dylib is not referenced for the ghc-6.12.3 binary. I used: http://www.haskell.org/ghc/dist/7.0.2/ghc-7.0.2-i386-apple-darwin.tar.bz2 http://www.haskell.org/ghc/dist/6.12.3/GHC-6.12.3-i386.pkg Any explanations? Cheers Christian

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ANNOUNCE: GHC version 7.0.2
by Ian Lynagh 09 Mar '11

09 Mar '11

============================================================= The (Interactive) Glasgow Haskell Compiler -- version 7.0.2 ============================================================= The GHC Team is pleased to announce a new patchlevel release of GHC. This release contains a number of bugfixes relative to 7.0.1, so we recommend upgrading. The release notes are here: http://www.haskell.org/ghc/docs/7.0.2/html/users_guide/release-7-0-2.html How to get it ~~~~~~~~~~~~~ The easy way is to go to the web page, which should be self-explanatory: http://www.haskell.org/ghc/ We supply binary builds in the native package format for many platforms, and the source distribution is available from the same place. Packages will appear as they are built - if the package for your system isn't available yet, please try again later. Background ~~~~~~~~~~ Haskell is a standard lazy functional programming language. GHC is a state-of-the-art programming suite for Haskell. Included is an optimising compiler generating good code for a variety of platforms, together with an interactive system for convenient, quick development. The distribution includes space and time profiling facilities, a large collection of libraries, and support for various language extensions, including concurrency, exceptions, and foreign language interfaces (C, whatever). GHC is distributed under a BSD-style open source license. A wide variety of Haskell related resources (tutorials, libraries, specifications, documentation, compilers, interpreters, references, contact information, links to research groups) are available from the Haskell home page (see below). On-line GHC-related resources ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Relevant URLs on the World-Wide Web: GHC home page http://www.haskell.org/ghc/ GHC developers' home page http://hackage.haskell.org/trac/ghc/ Haskell home page http://www.haskell.org/ Supported Platforms ~~~~~~~~~~~~~~~~~~~ The list of platforms we support, and the people responsible for them, is here: http://hackage.haskell.org/trac/ghc/wiki/Contributors Ports to other platforms are possible with varying degrees of difficulty. The Building Guide describes how to go about porting to a new platform: http://hackage.haskell.org/trac/ghc/wiki/Building Developers ~~~~~~~~~~ We welcome new contributors. Instructions on accessing our source code repository, and getting started with hacking on GHC, are available from the GHC's developer's site run by Trac: http://hackage.haskell.org/trac/ghc/ Mailing lists ~~~~~~~~~~~~~ We run mailing lists for GHC users and bug reports; to subscribe, use the web interfaces at http://www.haskell.org/mailman/listinfo/glasgow-haskell-users http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs There are several other haskell and ghc-related mailing lists on www.haskell.org; for the full list, see http://www.haskell.org/mailman/listinfo/ Some GHC developers hang out on #haskell on IRC, too: http://www.haskell.org/haskellwiki/IRC_channel Please report bugs using our bug tracking system. Instructions on reporting bugs can be found here: http://www.haskell.org/ghc/reportabug

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bin-package-db
by Kazu Yamamoto 09 Mar '11

09 Mar '11

Hello, The release note of GHC 7.0.2 says: ---- 1.5.6.3. bin-package-db This is an internal package, and should not be used. ---- What is the intention of this change? The author of "cabal-delete" hesitates to register "cabal-delete" into HackageDB due to this words. Shouldn't a package-maintenance command even use this package? If so, what package should be used? --Kazu

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help
by Simon Sin 08 Mar '11

08 Mar '11

Hi! I'm new to Haskell. Following someone's notes, I was doing this "doubleMe x = x + x". I did this two days ago and it worked. But I try to do it today, I got an error "parse error on input '=' ", This is rather inconsistent and should not happen in a computer compiler (i.e. day one works, day second not work) This comes up in both cases: loading a .hs file and interactively. Can anyone tell me what I did wrong? This happened to both my Win XP and my Ubuntu 10.10 PC. Thank you very much. Cheers. Simon.

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