- Hugs-Bugs - Haskell.org

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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Hugs indexed at AboutWebmasters.com e-commerce portal
by about＠aboutwebmasters.com 08 Dec '00

08 Dec '00

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

08 Dec '00

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. Cheers, - Conal -----Original Message----- From: Alastair Reid [mailto:reid@cs.utah.edu] Sent: Thursday, December 07, 2000 12:43 PM To: Doug Landauer (by way of Hans Aberg); Hugs Bugs Subject: RE: Hugs on Mac with CW6 ? ... and Haskell Graphics Lib? [Hugs Users removed from Cc list. Messages about machine support traditionally go to hugs bugs only. Also, since hugs-bugs members are supposed to be in hugs-users also, listing both is redundant.] > Unfortunately, I could not find any Mac port of the Haskell > Graphics Library. I'm afraid there isn't one. I have access to Unix and to Windows but not to a Mac. (Also I don't know the Mac API.) > 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. Let me describe a few major steps in being able to write (or port) something like the HGL for the Mac: 1) Get Hugs working (obviously) 2) Learn how to use one of the many Hugs Foreign Function Interfaces (FFIs) on the Mac. Choices: 1) Directly modify builtin.c in the Hugs distribution. Tedious, error-prone, not recommended. 2) Use GreenCard (http://www.dcs.gla.ac.uk/fp/software/green-card/) Stable, simple, limited level of support (none?) Requires you to find out how to build the Mac equivalent of shared libraries (Unix terminology) or DLLs (Windows terminology). (Looking at the Hugs sources, it appears that the answer is a .pef file and that someone has figured this out before - hopefully someone can send instructions in response to this message.) 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. It's not clear whether it's still supported since the above page says the real home page is at: http://www.dcs.gla.ac.uk/fp/software/hdirect which is a broken link. 4) Use the FFI standard (http://haskell.cs.yale.edu/definition/ffi/) possibly in conjunction with some of the ffi tools/libraries that have come out such as Manuel Chakravaty's C->Haskell library (http://www.cse.unsw.edu.au/~chak/haskell/c2hs/) This is the preferred option. There's just one small problem that I'll expand on below. 5) Consult Haskell.org (http://haskell.org/libraries/#interfacing) Of these, I strongly recommend (4) with (2) as a second choice. The one small problem with (4) is that the official Hugs distribution does not support the FFI standard. However, there is an unofficial Hugs distribution which does support it. You can download it from my home page: http://www.cs.utah.edu/~reid/tmp/hugs98-ffi-03122000.tgz If you need to use foreign export dynamic, you will need to write a small machine code stub for your architecture. 3) Learn how to write simple graphical programs in C for the Mac. By simple I mean how to do things like: Hello World (where the text appears centred on a window). A simple drawing program that puts a black pixel on the screen if the mouse button is depressed. Responds to simple keyboard input. Responds to periodic and/or one-shot timers. 4) Use your choice of FFI to translate your simple C programs into Haskell. 5) Contact me for help on understanding the code in the Hugs Graphics Library (or for hints on how to produce something equivalent). (There's someone else trying to port the HGL to GHC so a 3-way discussion might arise.) [The above list could take a while to work through and might be best tackled by a team of people rather than just one person who is new to Haskell. The HGL and all the associated tools, libraries and techniques I had to develop to write it was spread out over a period of about 5 years.] > -- would it be easier to work with GHC or HBC instead of Hugs? It would be easier in that both have mature implementations of the ffi. However, I don't know if either of them has been ported to the Mac yet. If the answer is no, I think it would be significantly easier to work with Hugs. (This belief is based on lots of experience with Hugs and GHC. I know very little about HBC.) -- Alastair Reid _______________________________________________ Hugs-Bugs mailing list Hugs-Bugs(a)haskell.org http://www.haskell.org/mailman/listinfo/hugs-bugs

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Hugs Feb2000
by Will Newton 04 Dec '00

04 Dec '00

I don't know if there is a newer release than this, I can't find it. In iomonad.c there are a number of places where fpos_t is cast to an int. You cannot do this. It can be fixed by using ftell instead. On glibc systems fpos_t is an aggregate type.

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Quick question
by Micha Pringle 04 Dec '00

04 Dec '00

I'd like to make a simple infix expression evaluator. It should be able to support simple functions, such as *, +, -,/ as well as simpl recursion. That is, if I define G <- 19 H <- G + 6 evaluate G shoulr return 25 Anyone know a good webpage for some info? cheers, Micha __________________________________________ Micha Pringle Systems Development TISCOM Systems Albisriederstrasse 365 CH-8047 Zurich Switzerland Tel: +41 (0)1 405 60 80 Fax: +41 (0)1 405 60 99 e-mail: micha.pringle(a)tiscom.com __________________________________________

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Re: ERROR: Too many ForeignObjs open
by Sigbjorn Finne 01 Dec '00

01 Dec '00

Koen Claessen koen@.cs.chalmers.se writes: > > Playing around with H/Direct, I often get the error: > > ERROR: Too many ForeignObjs open > > I think that in my case, a simple garbage collect would get > rid of a lot of these foreign objects. Is this true? In > other words: would a garbage collect just before this error > is generated help? Yes, it often will & the code already does this if there are no more empty slots in the table (by default, the table size is 10000 in a large Hugs configuration.) Exhausting that limit is in my experience a sign that you're accidentally holding on to too much external state (maybe at a too fine-grained a level -- this was an issue in an earlier version of the Com support libraries, for instance.) If you need to have that many FOs live, upping the limit & recompiling Hugs is the only way around the problem. --sigbjorn

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ERROR: Too many ForeignObjs open
by Koen Claessen 29 Nov '00

29 Nov '00

Hi, Playing around with H/Direct, I often get the error: ERROR: Too many ForeignObjs open I think that in my case, a simple garbage collect would get rid of a lot of these foreign objects. Is this true? In other words: would a garbage collect just before this error is generated help? Regards, Koen. -- Koen Claessen http://www.cs.chalmers.se/~koen phone:+46-31-772 5424 mailto:koen@cs.chalmers.se ----------------------------------------------------- Chalmers University of Technology, Gothenburg, Sweden

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