- C2hs - Haskell.org

patch applied (c2hs): Workaround the lack of CLDouble support in ghc/base
by duncan＠community.haskell.org 20 Apr '10

20 Apr '10

Mon Apr 19 09:49:39 EDT 2010 Duncan Coutts <duncan(a)haskell.org> * Workaround the lack of CLDouble support in ghc/base Ignore-this: 29920798e12fdc8dbcef328a0d94af9e If users try to bind to functions that use "long double" they will get an error message about the type not being supported. M ./src/C2HS/C/Info.hs +10 M ./src/C2HS/Gen/Bind.hs -2 +2 View patch online: http://code.haskell.org/cgi-bin/darcsweb.cgi?r=c2hs;a=darcs_commitdiff;h=20…

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c2hs status and ghc 6.12
by Chris Casinghino 12 Apr '10

12 Apr '10

Hi all, Are there plans to release a version of c2hs that compiles with ghc 6.12? I see a patch was posted to this list in February, but no new version has appeared on hackage. And, as the last poster mentioned, the darcs repository from the c2hs website seems to have disappeared. I use c2hs in some software, so I'm hoping for a new release that will make it easier to compile with cabal. Thanks for your help (and for the great software - c2hs has made my life a lot easier). --Chris Casinghino

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Patch to work with ghc 6.12.
by Marco Túlio Gontijo e Silva 14 Feb '10

14 Feb '10

Hi. I've ported the patch of Duncan Coutts to the internal c2hs of gtk2hs to make it build with ghc 6.12, and applied it to version 0.16.0 of c2hs. The patch is attached, and I'm using it in Debian, since the current version of ghc6 in sid is 6.12.1. Greetings. -- marcot http://marcot.iaaeee.org/

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License for the c2hs manual
by Marco Túlio Gontijo e Silva 14 Feb '10

14 Feb '10

Hi. I notice that the c2hs manual from c2hs-0.16.0 is licensed under GFDL, which is not free according to the Debian Free Software Guidelines. I'd like to ask the c2hs developers to distribute the manual under a license that is compatible with DFSG, otherwise we'll have the following alternatives: * Move the c2hs to the non-free area of the archive. * Remove the manual from the c2hs package, possibly creating a package containing the manual in the non-free area. Is the license change possible? Thanks. -- marcot http://marcot.iaaeee.org/

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c2hs.exe "does not exist" on windows
by Chris Casinghino 03 Jan '10

03 Jan '10

I see in the list archives that someone posted this problem a few weeks ago, but there wasn't a response. So, let me confirm I'm having it too. I installed the haskell platform on windows and then used cabal to install c2hs. It put a binary called "c2hs.exe" in "C:\Program Files\Haskell\bin", which appears to be on my path. However, when I go to build some software I've written that uses c2hs, cabal gives me this error: c2hs.exe: does not exist My package builds fine in linux. The computer I'm at now is running windows xp, service pack 2. I can try it out on a windows 7 computer tomorrow if that would be helpful. This is my first attempt to build Haskell software on windows, so it's conceivable I'm doing something silly. Thanks in advance for your help. --Chris Casinghino

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On the disappearance of CLDouble
by Duncan Coutts 13 Dec '09

13 Dec '09

Manuel, other interested c2hs people, GHC 6.12 removes the CLDouble type from the FFI libs. Of course this means c2hs currently does not compile. The question is what level we should handle this at. Do we also stop recognising and translating long double in C code? Perhaps we should recognise it but fail with an error message to the effect that there is no corresponding Haskell type. Suggestions welcome. Duncan

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CHS lexer goes into infinite loop on chars > 255
by Duncan Coutts 13 Dec '09

13 Dec '09

Found another bug that surfaces when we compile c2hs with ghc-6.12. By default text files are now read in the locale encoding rather than just ASCII. This means we can (and do) get characters over 255. The behaviour is that c2hs goes into an infinite loop and consumes all the memory on your machine (in particular this happens with some files in gtk2hs). Unfortunately the 255 assumption is pretty strongly wired into the c2hs lexer. From Lexer.hs: -- * Unicode posses a problem as the character domain becomes too big -- for using arrays to represent transition tables and even sparse -- structures will posse a significant overhead when character ranges -- are naively represented. So, it might be time for finite maps again. The short term solution is to set the text mode to be ASCII. In the longer term we might want to replace the .chs lexer and parser, like we did already for the C parser. Duncan

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How to deal with spread parameter?
by Magicloud Magiclouds 07 Dec '09

07 Dec '09

Hi, How to use "fun" hook to wrap things like "void foo (int** arg)"? Thanks. -- 竹密岂妨流水过山高哪阻野云飞

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c2hs problem on windows
by M Xyz 05 Dec '09

05 Dec '09

I'm using the Haskell Platform 2009.2.0.2 on XP and just installed c2hs with "cabal install c2hs". It seemed to install fine and didn't give any errors. It installed c2hs.exe in "C:\Program Files\Haskell\bin" And c2hs.hs in "C:\Program Files\Haskell\c2hs-0.16.0" Im trying to install portaudio which has a dependency on c2hs and I get the error: "cabal: The program c2hs is required but it could not be found". So as a guess I added the above 2 directories to the system path. Now when I compile I get the error "c2hs.exe: does not exist". Did I improperly setup c2hs on my machine? I'd appreciate any help. Thank you!

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How to use withCStringLen?
by Magicloud Magiclouds 24 Nov '09

24 Nov '09

Hi, I am new to c2hs, while learning and trying it out, I am confused on how to use withCStringLen. Well, I mean how to use it in .chs file, since the code style is a little different from .hs. Thanks. -- 竹密岂妨流水过山高哪阻野云飞

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