December 2000 - Hugs-Bugs

OSX
by Michel Schellekens 25 Oct '02

25 Oct '02

After downloading the OSX version, and typing "hugs" to start up the language, I obtain the following error: [schellekens:~] mpcs% hugs dyld: hugs can't open library: /usr/lib/libncurses.5.dylib (No such file or directory, errno = 2) Any suggestions? Michel.

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compiling hugs with latest linux glibcs
by Ganesh Sittampalam 30 Dec '00

30 Dec '00

Hi, When I try to compile the February 2000 release of hugs with latest releases of linux glibc (found in redhat 7.0 and the development distribution of debian), I get the following errors: gcc -c -g -O2 builtin.c In file included from builtin.c:1431: iomonad.c: In function `primHGetPosn': iomonad.c:715: aggregate value used where an integer was expected iomonad.c: In function `primHSetPosn': iomonad.c:730: invalid initializer iomonad.c:736: incompatible types in assignment make: *** [builtin.o] Error 1 This is caused by changes to the fpos_t type, which is no longer directly castable to an int. I'm not sure what the appropriate fix is, since there don't seem to be accessor functions for the type - making the source look inside the structure that fpos_t has become would then break with older glibcs. I've just removed the references to fgetpos and fsetpos from src/unix/configure.in to make it compile for now. Regards, Ganesh Sittampalam

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web bug
by Melchesideck＠aol.com 25 Dec '00

25 Dec '00

Received a fail to load when trying to download the WinHelp file fromthe Win32 section of the download page. Eric

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Context reduction with functional dependencies?
by Thomas Hallgren 15 Dec '00

15 Dec '00

Hi, I have been doing an experiment where I use type classes to express static (compile-time) computations in Haskell. With multi-parameter classes and functional dependencies, instance declarations can be used to define function by pattern matching (on the type level). I enclose an example where I define booleans, natural numbers, a less-than-or-equal-to function and a maximum function. In some simple examples (one_lte_two and two_lte_one), it works fine, but in the last example, where I try to compute the maximum of 1 and 2 in Hugs (hugs -98, February 2000), I get the following error message: Type checking ERROR "FuncDeps4.hs" (line 27): Unresolved top-level overloading *** Binding : max_one_two *** Outstanding context : (Lte Z (S Z) b, If b (S (S Z)) (S Z) c) Here I expected that the functional dependencies would allow b to be instantiated to T, and hence c to be instantiated to S (S Z), which would then be the type of max_one_two. Why doesn't this work? Regards, Thomas Hallgren module FuncDeps4 where data T data F class If b t e r | b t e -> r instance If T t e t instance If F t e e data Z data S n type One = S Z type Two = S One class Lte a b c | a b -> c where lte :: a -> b -> c instance Lte Z b T instance Lte (S n) Z F instance Lte a b c => Lte (S a) (S b) c one_lte_two = lte (u::One) (u::Two) -- :: T two_lte_one = lte (u::Two) (u::One) -- :: F class Max a b c | a b -> c where max' :: a -> b -> c instance (Lte a b l,If l b a c) => Max a b c -- This doesn't work without the type signature: max_one_two = max' (u::One) (u::Two) -- :: Two u=undefined -- Just a convenient abbreviation

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Maybe a bug
by Francisco Vieira de Souza 14 Dec '00

14 Dec '00

Please, I'm a beginner in Hugs, but I try to put the characters \n or \t but it doesn't work well. I'm using november 1999 version. When I use, for instance, the string "something\n\n" the result is "something\n\n" and doesn't make a newline. With \t is the same problem. Can someone help me please? Thanks in advance. Vieira -----------------------------|-------------------------------- Francisco Vieira de Souza |"O unico tirano que aceito DIE-UFPI-Fone:(086) 215 5837 |neste mundo eh a voz silenciosa Celular: (086) 987-9926 |dentro de mim, a consciencia" E-mail: vieira(a)ufpi.br | (Mahatma Gandhi, 1869-1948) _____________________________|________________________________

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Win32 lib and Greencard building
by Reuben Thomas 13 Dec '00

13 Dec '00

I'd like to integrate the building of GreenCard and the Win32 library more closely with the GHC build system, for ease of building. These are both used with Hugs (correct?) and hence presumably (unless you no longer use the versions in the fptools CVS tree) you probably don't want me just to strip out all the Hugs-related build stuff. On the other hand, I'd like to take advantage of GHC's build system, and integrate into that... Have you any suggestions on what's the nicest thing I could do? The minimum sensible is just a couple of tweaks to the files so that at least everything is built automatically as part of a GHC build, but that would just allow you to comment out a couple of lines to build for Hugs (in much the same way as I presume you do at the moment). -- http://sc3d.org/rrt/ | Caution Children At Play Drive Slowly

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Re: http://www.cse.ogi.edu/PacSoft/projects/Hugs/pages/downloading.htm
by Doug Landauer 11 Dec '00

11 Dec '00

On Monday, December 11, 2000, at 08:22 AM, dkcombs(a)panix.com wrote: > > QUESTION: what about SOLARIS (7)? > > It says NOTHING about unix *other than* > LINUX. > > Also, what GRAPHICS are available? The > book I have is Hudak's, ie all via graphics > examples, code, etc. I did get the Haskell Graphics Library to work on my Solaris system (Solaris 7). It just assumes that if you have such a system, you know how to tweak their Makefile to make it build you a dynamically loadable library. So it took me a bit of studying of some man pages and stuff, but here's what worked for me (I'm using gcc on Solaris; I don't have a copy of the Sun C compiler so I can't tell ya how to get that to work). The only changes I had to make were in the x11/Makefile: diff -c -r HGL_graphics_orig/graphics-2.0.3/lib/x11/Makefile graphics-2.0.3/lib/x11/Makefile *** HGL_graphics_orig/graphics-2.0.3/lib/x11/Makefile Sun Jun 25 23:50:30 2000 --- graphics-2.0.3/lib/x11/Makefile Thu Nov 9 18:05:16 2000 *************** *** 27,33 **** # Configuration (needs to be customised) ################################################################ ! XDIR = /usr/X11R6 # Either use the next line (if you have a GreenCard binary installed) #GC = greencard --- 27,33 ---- # Configuration (needs to be customised) ################################################################ ! XDIR = /usr/openwin # Either use the next line (if you have a GreenCard binary installed) #GC = greencard *************** *** 36,43 **** GCDIR = $(HOME)/local/greencard-2.0 GC = $(RUNHUGS) -c100 -h2m $(GCDIR)/src/GreenCard.lhs ! CC = cc LDFLAGS += -shared -nostdlib ################################################################ # Files (should not need to be customised) --- 36,47 ---- GCDIR = $(HOME)/local/greencard-2.0 GC = $(RUNHUGS) -c100 -h2m $(GCDIR)/src/GreenCard.lhs ! CC = gcc -v -mimpure-text ! ! # Without -mimpure-text, these LDFLAGS lead to a bunch of "Text relocation remains" ! # error messages which stop the link. LDFLAGS += -shared -nostdlib + # ################################################################ # Files (should not need to be customised) *************** *** 77,82 **** --- 81,87 ---- %.o : %.c $(CC) $(CFLAGS) $(INCLUDES) $< -c %.so : %.o + echo LDFLAGS are '<'$(LDFLAGS)'>' $(CC) $(LDFLAGS) $(LIBS) -o $@ $< ################################################################ > Also, please tell me HOW to sign up for the > mailing list. See http://www.haskell.org/mailman/listinfo/hugs-users. However, they tell me that hugs-bugs is a more appropriate place for platform-specific questions. See http://www.haskell.org/mailman/listinfo/hugs-bugs Hope this helps, -- Doug

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Fwd: Hugs on Mac with CW6 ? ... and Haskell Graphics Lib?
by Doug Landauer 11 Dec '00

11 Dec '00

Hello, I was wondering whether you know if anyone has gotten Hugs to compile on Mac OS 9, using CodeWarrior 6. I am wanting to get to know Haskell a little, and I have a copy of Paul Hudak's book "The Haskell School of Expression", so I thought it would be cool to run the book's examples on my Mac at home. Unfortunately, I could not find any Mac port of the Haskell Graphics Library. So I decided it would make sense to try to compile Hugs on the Mac. Though I have known C for decades (worked at Sun for 10 years, now Apple for just over five), I'm a novice at using Codewarrior and at Mac GUI programming in C. It looks like Metrowerks may have changed some things about the SIOUX interface and/or how stdarg.h works, in between CW 5 and CW 6. (I deduce this from my feeble attempts at compiling and debugging a plain Hugs with CW 6.) Once I can get a plain Hugs working with CW 6, I'm hoping to try to figure out how to get it to interface to C, so I could supply something like the Haskell Graphics Library and link it in with Hugs. So anyway, I have some specific questions: -- has anyone gotten Hugs to compile on Mac OS 9 under CW 6? -- has anyone gotten Hugs+HGL to work on any Mac (OS 9 or OS X)? -- where should I look to figure out how the mac version of Hugs wants to interface with a C-based library? -- would it be easier to work with GHC or HBC instead of Hugs? (High speed is not a big concern of mine at the moment, I just want to learn and be able to play around with Haskell.) Thanks in advance for any guidance you might be able to provide. -- -- Doug Landauer landauer(a)scruznet.com (home) landauer(a)apple.com (work)

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Re: Hugs on Mac with CW6 ? ... and Haskell Graphics Lib?
by Hans Aberg 09 Dec '00

09 Dec '00

>Hello, I was wondering whether you know if anyone has gotten >Hugs to compile on Mac OS 9, using CodeWarrior 6. I am wanting >to get to know Haskell a little, and I have a copy of Paul >Hudak's book "The Haskell School of Expression", so I thought >it would be cool to run the book's examples on my Mac at home. I have forwarded your letter to Johan Nordlander <nordland(a)cse.ogi.edu> who is interested in implementing graphics on MacOS Hugs. -- I do not know whether he is using CW Pro 5 or 6, though. I'm & Pablo are currently using CW Pro 5, but feel free to use CW Pro 6 for any contributions you make. -- If I continue using CW, I will probably upgrade in the future. -- If you are not currently subscribing to the Hugs-Users & Hugs_bugs mailing lists, please do so <http://haskell.org/>, because the kind of info you look for will be posted there. > -- has anyone gotten Hugs to compile on Mac OS 9 > under CW 6? I would suggest you to try compile the sources I have for CW 5 under CW 6, and see what breaks. Perhaps Johan has already done this. In these version, I have implemented AppleEvent's using the AEGizmo's package, which might interest you if you work at Apple -- I think a functional language light Haskell might be suitable to describe the high level events. > -- has anyone gotten Hugs+HGL to work on any Mac > (OS 9 or OS X)? Yes, GCC is available under MacOS X, in Hugs compiles straight off, Atze Dijkstra <atze(a)cs.uu.nl> reports to the Hugs-users mailing list. He is currently working on GHC. There will (hopefully) be a interpreter GHCi possibly replacing Hugs in the future(?), so this work in important. -- I think myself that it is not really worth developing for pre-MacOS X, and for MacOS X, it is perhaps better to simply use the freely available GCC. >It looks like Metrowerks may have changed some things >about the SIOUX interface and/or how stdarg.h works, in >between CW 5 and CW 6. (I deduce this from my feeble >attempts at compiling and debugging a plain Hugs with CW 6.) The interface we use is that CW's SIOUX sources are duplicated and then modified. So if it is not working under CW 6, it is probably because we didn't put copies of all CW 5 SIOUX sources into the project. Even though this is just a quick-fix way to develop the GUI, the components could be used for developing an entirely new GUI. The SIOUX CW 5 windows isn't a very good package, because it contains too many updates, isn't thread safe. So it would be better to make an entirely new GUI. This is probably an interesting topic, though time consuming, and I think one would be better off developing a new GUI for MacOS X directly. > -- where should I look to figure out how the mac version > of Hugs wants to interface with a C-based library? There is something called HDirect, I think but I have never used it. When I implemented the AppleEvent's via the AEGizmo's package, I did that via strings. Then the problem to overcome is that Haskell is a lazy language, so in order to retrieve the string for a C-program, the entry on the stack must first be evaluated. So for that I stile some code I happened to find somewhere in the Hugs package. The lack of such an interface for common C-types seems to be a weakness of the current Hugs, but it is not so difficult implementing the stuff if one only figures out how Hugs works. Another problem with Hugs is that it is not thread-safe (pure, re-entrant), so if one interrupts (say via an AppleEvent) the current evaluations to execute some other Haskell code, you may end up with trouble (or, if you are luck the code doesn't break.) -- My wish is that if a new Haskell interpreter shows up, GHCi, or whatever, it is going to be thread-safe in the sense that multiple Haskell threads can be executed in parallel. This would be most important for applications, such as executing AppleEvent's and such. But I do not know if that is the plan for GHCi. Otherwise, it was not so difficult making Hugs working with C-code. > -- would it be easier to work with GHC or HBC instead of Hugs? > (High speed is not a big concern of mine at the moment, > I just want to learn and be able to play around with > Haskell.) I do not know exactly what will happen in the future: For Mac's, it seems most prudent to develop for MacOS X, as that is available already as a beta. GHCi is said to arrive in the spring, so when that arrives, so will be able to know. If Atze is making progress with GCC under MacOS X, that will simplify matters, I think. -- Perhaps somebody else can explain the exact differences between Hugs & GHCi. -- As it is extremely time-consuming developing a MacOS GUI, probably also under MacOS X, even though the situation would be better, I think it would be great if people agree to different parts on the same MacHugs. Hans Aberg * Email: Hans Aberg <mailto:haberg@member.ams.org> * Home Page: <http://www.matematik.su.se/~haberg/> * AMS member listing: <http://www.ams.org/cml/>

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RE: Hugs on Mac with CW6 ? ... and Haskell Graphics Lib?
by Hans Aberg 08 Dec '00

08 Dec '00

At 17:10 -0800 0-12-07, Conal Elliott wrote: >> 3) Use H/Direct (http://haskell.cs.yale.edu/haskellscript/hdirect.html) >> Easy to use if you already have a COM/IDL specification of the API >> you want to use. ... >I'm surprised at the preference of GreenCard over H/Direct. H/Direct was >designed as an evolution of GreenCard based on experience with it, and has a >strong foundation, as described in ICFP '98. The home page is >http://haskell.org/hdirect. I don't know about its status relative to the >Mac. Maybe Sigbjorn could comment. There is in MacOS X's pre-OS X's cmpatible stuff called "Carbon" compatibility with MS's COM, see http://developer.apple.com/techpubs/macosx/ReleaseNotes/CFBundleAndCFPlugIn… http://developer.apple.com/techpubs/macosx/System/Documentation/Developer/R… eNotes/CFBundleAndCFPlugIn.html But I found no docs' for it with respect to the new MacOS X components. Hans Aberg * Email: Hans Aberg <mailto:haberg@member.ams.org> * Home Page: <http://www.matematik.su.se/~haberg/> * AMS member listing: <http://www.ams.org/cml/>

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