- iPhone - Haskell.org

Progress report: working GHC cross compiler
by Stephen Blackheath [to GHC-iPhone] 09 Nov '11

09 Nov '11

All, It needs work yet, but I've got a GHC "toolchain" cross compiler working, with an ARM linux target. This is an important step in making a new GHC-iPhone cross compiler. The patches against GHC HEAD are here: http://hip-to-be-square.com/~blackh/ghc-cross/ For ARM targets, you need llvm version 3.0 or greater (thanks to me, Karel Gardas and David Terei). If it hasn't been released yet when you read this, rc3 (which works for my ARMv5 target) can get got from: http://llvm.org/pre-releases/3.0/ Incidentally, Ben Gamari is working on ghc linker support, which means that ghci and runhaskell will work on ARM. Template Haskell might be trickier, though, so it isn't supported for now in cross compilers. "Cross compiling" with reference to GHC now means two things: 1. Porting GHC: If you want to port local-compiling GHC to a new platform, do ./configure --host=arm-ldu-linux-gnueabi 2. My meaning - building a toolchain: To build a compiler that runs locally but builds for a foreign platform, do ./configure --target=arm-ldu-linux-gnueabi I'll make sure I document this somewhere. NOTES: This patch assumes that the GNU convention is followed, that all the cross-compiling tools are prefixed with the target name, e.g. arm-ldu-linux-gnueabi-ld. iPhone doesn't follow this but I propose to fix this with a directory full of symlinks. 'alien' is a script you have to provide to allow foreign code to be run locally. This is required for a couple of things now, but (as Duncan Coutts pointed out) this could probably ultimately be eliminated, using the autotools AC_COMPUTE_INT technique (which interrogates the compiler directly). Following the convention of the Linux kernel, in these patches, Cabal uses an environment variable called CROSS_COMPILE to supply a prefix for all compile tools at runtime. The idea is that ghc and ghc-pkg's executable names will also be prefixed with the target name. You would use that in combination with PATH to switch between Cabal working for a local compiler or for cross-compiling. Steve ON PC: blackh@amentet:~/src/ghc$ inplace/bin/ghc-stage1 --version The Glorious Glasgow Haskell Compilation System, version 7.3.20111107 blackh@amentet:~/src/ghc$ inplace/bin/ghc-stage1 pidigits.hs [1 of 1] Compiling Main ( pidigits.hs, pidigits.o ) Linking pidigits ... blackh@amentet:~/src/ghc$ scp pidigits root(a)192.168.1.129: root(a)192.168.1.129's password: pidigits 100% 9664KB 2.4MB/s 00:04 blackh@amentet:~/src/ghc$ ON TARGET MACHINE (QEMU) root@ldu:~# uname -a Linux ldu 2.6.37-versatile #2 Tue Oct 18 12:00:46 NZDT 2011 armv5tejl GNU/Linux root@ldu:~# ./pidigits 1000 3141592653 :10 5897932384 :20 6264338327 :30 9502884197 :40 1693993751 :50 0582097494 :60 4592307816 :70 4062862089 :80 9862803482 :90 5342117067 :100 9821480865 :110 1328230664 :120 7093844609 :130 5505822317 :140 2535940812 :150 8481117450 :160 2841027019 :170 3852110555 :180 9644622948 :190 9549303819 :200 6442881097 :210 5665933446 :220 1284756482 :230 3378678316 :240 5271201909 :250 1456485669 :260 2346034861 :270 0454326648 :280 2133936072 :290 6024914127 :300 3724587006 :310 6063155881 :320 7488152092 :330 0962829254 :340 0917153643 :350 6789259036 :360 0011330530 :370 5488204665 :380 2138414695 :390 1941511609 :400 4330572703 :410 6575959195 :420 3092186117 :430 3819326117 :440 9310511854 :450 8074462379 :460 9627495673 :470 5188575272 :480 4891227938 :490 1830119491 :500 2983367336 :510 2440656643 :520 0860213949 :530 4639522473 :540 7190702179 :550 8609437027 :560 7053921717 :570 6293176752 :580 3846748184 :590 6766940513 :600 2000568127 :610 1452635608 :620 2778577134 :630 2757789609 :640 1736371787 :650 2146844090 :660 1224953430 :670 1465495853 :680 7105079227 :690 9689258923 :700 5420199561 :710 1212902196 :720 0864034418 :730 1598136297 :740 7477130996 :750 0518707211 :760 3499999983 :770 7297804995 :780 1059731732 :790 8160963185 :800 9502445945 :810 5346908302 :820 6425223082 :830 5334468503 :840 5261931188 :850 1710100031 :860 3783875288 :870 6587533208 :880 3814206171 :890 7766914730 :900 3598253490 :910 4287554687 :920 3115956286 :930 3882353787 :940 5937519577 :950 8185778053 :960 2171226806 :970 6130019278 :980 7661119590 :990 9216420198 :1000 root@ldu:~#

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Installing various packages
by David Pollak 08 Nov '11

08 Nov '11

Howdy, I'm back to using GHC-iphone... I'm merging stuff I've been working on into an iPad app. I'm using certain libraries like Parsec 3 (is Parsec 3 GHC 7 only?) When I do a try to install Parsec: dpp@oldboy:~/proj/LispHaskellIPad$ iphone-cabal install parsec Warning: Error parsing config file /Users/dpp/.cabal/config:77: Parse of field 'libsubdir' failed (paths with spaces must use Haskell String syntax): Warning: Using default configuration. Resolving dependencies... Configuring deepseq-1.2.0.1... Preprocessing library deepseq-1.2.0.1... Building deepseq-1.2.0.1... [1 of 1] Compiling Control.DeepSeq ( Control/DeepSeq.hs, dist/build/Control/DeepSeq.o ) In file included from /var/folders/kQ/kQnNu0yWEJWl+kNm1oRfTE+++TI/-Tmp-/ghc4575_0/ghc4575_0.hc:3:0: /opt/iphone/lib/ghc-6.10.4-iphone/include/Stg.h:54:18: error: math.h: No such file or directory iphone-cabal: Error: some packages failed to install: deepseq-1.2.0.1 failed during the building phase. The exception was: exit: ExitFailure 1 parsec-3.1.2 depends on deepseq-1.2.0.1 which failed to install. text-0.11.1.9 depends on deepseq-1.2.0.1 which failed to install. dpp@oldboy:~/proj/LispHaskellIPad$ Bad things happen. Any pointers or hints to make iphone-cabal work for parsec? Also, a note to the developers on the list... don't upgrade to Lion... Xcode 4 on Lion seems to not work at all with any of the Haskell stuff (iphone or GHC 7). Thanks, David

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Synchronising With OE
by John Waghorne 09 Oct '11

09 Oct '11

I keep my contact details on my PC in Outlook Express and I really don't want to type them all in again to my 3GS but I can't find out how to get the 3GS to synchronise with OE. Anybody help, please? John Waghorne

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Has anybody tried Xcode 4 and ghc7 ?
by Pradeep Kumar 13 Sep '11

13 Sep '11

Hello all, I have setup the binaries from ghc-iphone-binary-1.6-sdk-4.2.tar.bz2. I can compile the GetInBehind sample project for the simulator, for compiling for the device however I get errors from the haskell project like /opt/iphone/lib/ghc-6.10.4-iphone/include/Stg.h:54:18: error: math.h: No such file or directory /opt/iphone/lib/ghc-6.10.4-iphone/include/HsFFI.h:31:20: error: stdint.h: No such file or directory /opt/iphone/lib/ghc-6.10.4-iphone/include/HsFFI.h:69:19: error: float.h: No such file or directory In file included from /opt/iphone/lib/ghc-6.10.4-iphone/include/Rts.h:22, /opt/iphone/lib/ghc-6.10.4-iphone/include/RtsExternal.h:43:0: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'forkProcess' /opt/iphone/lib/ghc-6.10.4-iphone/include/gmp.h:519:0: error: expected declaration specifiers or '...' before 'size_t' /opt/iphone/lib/ghc-6.10.4-iphone/include/gmp.h:519:0: error: expected declaration specifiers or '...' before 'size_t' /opt/iphone/lib/ghc-6.10.4-iphone/include/gmp.h:519:0: The only changes I have done to the project is to set the base sdk to ios4.3 and the SDKROOT in Haskell project to iphoneos4.3. The library search paths are set as per "Fix “Library search paths”" in the document. Any hint to what might be the issue? Thank you Pradeep

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GHC supports Objective-C
by Gerold Meisinger 12 Aug '11

12 Aug '11

http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/release-7-2-1.html Compiling Objective-C (.m) files is now supported, assuming your gcc is capable of compiling them.

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new user
by Lisa McLaughlin 02 Jul '11

02 Jul '11

hi new user here, just wanted to say hi.

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Automatically freeing function pointers
by David Pollak 20 Jun '11

20 Jun '11

Howdy, I tried to build a function that would create an auto-freeing function pointer: runOnMain :: IO () -> IO () runOnMain todo = do func <- funky dispatchFunc func where funky = mkStrCB $ \v -> do todo func <- funky freeHaskellFunPtr func Unfortunately, I wind up getting: internal error: iPhoneCreateAdjustor - adjustor pool 'Main_d2K2' is empty (capacity 32) (GHC version 6.10.4-iphone-simulator for i386_apple_darwin) I'm not sure why, but I suspect that funky is being called recursively and thus stuff is never being freed. Any hints as to the issue and solutions? Thanks, David -- Lift, the simply functional web framework http://liftweb.net Simply Lift http://simply.liftweb.net Follow me: http://twitter.com/dpp Blog: http://goodstuff.im

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Thread model questions
by David Pollak 11 Jun '11

11 Jun '11

Howdy, I've got a question about threading and thread models in ghc-iphone. My understanding is that Haskell has its own threading model that under the covers uses OS threads, but allows for significantly more active threads. Is this a correct understanding? If so, how does the Haskell threading model work on the iPhone? Is it that iOS is close enough to OS X/Darwin that it "just works"? If it "just works", then how does one marshal an event back onto the iOS "UI thread" so that the display or draw or whatever command can take place on the UI thread? Is there a convention or recipe for doing so? Would it be possible to put an event on the UI event queue that applies an Haskell closure such that the Haskell code that contains the computed value (I'd force the computation before marshaling the event to minimize the actual delay on the UI thread) then mutates the UI based on the computed value? Given the 5 second rule about an iOS app getting shut down... if there are Haskell threads doing Haskell-y kind of work, is there a way of notifying those threads en masse about the shutdown? Thanks, David -- Lift, the simply functional web framework http://liftweb.net Simply Lift http://simply.liftweb.net Follow me: http://twitter.com/dpp Blog: http://goodstuff.im

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Lisp in Haskell on iPad
by David Pollak 10 Jun '11

10 Jun '11

Howdy all, Okay... got my first iPad app running (super duper big thanks to ghc-iphone): https://github.com/dpp/LispHaskellIPad It's a Lisp interpreter written in Haskell. Enjoy. Thanks, David -- Lift, the simply functional web framework http://liftweb.net Simply Lift http://simply.liftweb.net Follow me: http://twitter.com/dpp Blog: http://goodstuff.im

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ghc-iphone and GHC 7.0.2
by David Pollak 08 Jun '11

08 Jun '11

Howdy, I'm running GHC 7.0.2 on OS X Snow Leopard (64 bit) Is it possible to get ghc-iphone to work with GHC 7? Also, is there a source repository for the ghc-iphone code? Sorry for the dumb/newbie questions. It's the first week in a new environment (Haskell) and I'm feeling my way around and bumping my head a lot. Thanks, David -- Lift, the simply functional web framework http://liftweb.net Simply Lift http://simply.liftweb.net Follow me: http://twitter.com/dpp Blog: http://goodstuff.im

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