August 2002 - 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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Hugs, Mac OS X 10.1.5, and pathnames
by Hamilton Richards 13 Sep '02

13 Sep '02

In OS X, pathnames have two distinct syntaxes. The GUI uses the pre-X syntax, in which a pathname begins with a volume name and the separator is `:', as in Macintosh HD:Users:ham:Documents:whatever.hs In the Darwin (i.e., unix) command-line "underworld", a pathname begins with /Volumes, spaces are escaped with `\', and the separator is `/', as in /Volumes/Macintosh\ HD/Users/ham/Documents/whatever.hs When you drag a file icon onto the command line, Terminal does the right thing-- it converts the pathname from the GUI syntax to the Darwin syntax, and utilities such as more work just as they should. Hugs, however, doesn't do so well. For example, Prelude> :l /Volumes/Macintosh\ HD/Users/ham/Documents/whatever.hs Reading file "/Volumes/Macintosh\": ERROR "/Volumes/Macintosh\" - Unable to open file "/Volumes/Macintosh\" Quoting the pathname changes the problem, but doesn't cure it: Prelude> :l "/Volumes/Macintosh\ HD/Users/ham/Documents/whatever.hs" ERROR - Missing `\' terminating string literal gap Apparently what's confusing Hugs is the `\', because removing it cures the problem: Prelude> :l "/Volumes/Macintosh HD/Users/ham/Documents/whatever.hs" Reading file "/Volumes/Macintosh HD/Users/ham/Documents/whatever.hs": Is this problem unavoidable, or is it just an oversight? Thanks, --Ham -- ------------------------------------------------------------------ Hamilton Richards Department of Computer Sciences Senior Lecturer Mail Code C0500 512-471-9525 The University of Texas at Austin Taylor Hall 5.138 Austin, Texas 78712-1188 ham(a)cs.utexas.edu hrichrds(a)swbell.net ------------------------------------------------------------------

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Hugs on MacOS X 10.2
by Johan Nordlander 30 Aug '02

30 Aug '02

Dear MacOS X users, As some of you have reported already, the latest MacOS X version (10.2) breaks hugs. After going through the hurdles of upgrading and fixing the problems myself, I'd like share my findings. Most importantly, the current binary distribution won't run under 10.2 due to some dynamic linking problem that I haven't investigated in any depth. A simple recompilation solves that problem, though. I've updated the binary package on the hugs download page, so a simple install of that package should solve the linking problem (note that the name is still the same as the old one). If you'd rather compile the source distribution yourself that should work just fine as well. However, MacOS X 10.2 presents a few other problems for hugs users as well. Firstly, the way tcsh finds its rc files has been changed. So if you (like me) relied on a system-wide script to find your rc files in ~/Library/init/tcsh/ you'll probably notice that your files aren't read anymore, and (worse), /usr/local/bin/ isn't in your default path. This means that hugs won't be found after you've installed it. The README file in /usr/share/tcsh/examples/ will tell you how to restore the old functionality, though. Secondly, if you did a clean install when you upgraded to 10.2 you'll find that the entire /usr/local tree has been moved away to a backup location, together with a bunch of other "system"-oriented directories. This won't affect hugs per se if you're reinstalling the new binary package, but if you're also relying on other packages (like X11 or readline), you might want to either reinstall those, or move them back from the backup directory. The backed-up file are found in /Previous\ Systems/. Hope these tips will help hugs run smoothly on your Mac again! -- Johan

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Mac OSX
by Jeff Graham 30 Aug '02

30 Aug '02

Sorry to say, but it appears that the new version 10.2 (Jaguar) of Mac OSX breaks Hugs. It fails with a Trace/BPT trap. If you are already aware of this, I'd be interested to hear once a new release is available.

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problems
by Wicks, Robert 29 Aug '02

29 Aug '02

Have loaded hugs98 onto my pc, have written a program in notepad tried to load program within hugs but comes up with error message unable to open file c:\remall, to open file iv'e been typing :l c:\remall or :l c:\remall,hs, any suggestions would be gratefully recieved. Robert Wicks ICT Network Communications ********************************************************************** Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email. Please advise immediately if you or your employer does not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of the Council of the City and County of Cardiff shall be understood as neither given nor endorsed by it. All e-mail sent to or from this address will be processed by Cardiff County Councils Corporate E-mail system and may be subject to scrutiny by someone other than the addressee. ********************************************************************** Mae'n bosibl bod gwybodaeth gyfrinachol yn y neges hon. Os na chyfeirir y neges atoch chi'n benodol (neu os nad ydych chi'n gyfrifol am drosglwyddo'r neges i'r person a enwir), yna ni chewch gopio na throsglwyddo'r neges. Mewn achos o'r fath, dylech ddinistrio'r neges a hysbysu'r anfonwr drwy e-bost ar unwaith. Rhowch wybod i'r anfonydd ar unwaith os nad ydych chi neu eich cyflogydd yn caniatau e-bost y Rhyngrwyd am negeseuon fel hon. Rhaid deall nad yw'r safbwyntiau, y casgliadau a'r wybodaeth arall yn y neges hon nad ydynt yn cyfeirio at fusnes swyddogol Cyngor Dinas a Sir Caerdydd yn cynrychioli barn y Cyngor Sir nad yn cael sel ei fendith. Caiff unrhyw negeseuon a anfonir at, neu o'r cyfeiriad e-bost hwn eu prosesu gan system E-bost Gorfforaethol Cyngor Sir Caerdydd a gallant gael eu harchwilio gan rywun heblaw'r person a enwir. **********************************************************************

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RE: Seg Fault
by Simon Marlow 28 Aug '02

28 Aug '02

> Here's what options.h has to say: > > /* In a plain Hugs system, most signals (SIGBUS, SIGTERM, > etc) indicate > * some kind of error in Hugs - or maybe a stack overflow. > Rather than > * just crash, Hugs catches these errors and returns to the > main loop. > * It does this by calling a function "panic" which > longjmp's back to the > * main loop. > * If you're developing a GreenCard library, this may not > be the right > * behaviour - it's better if Hugs leaves them for your debugger to > * catch rather than trapping them and "panicing". > */ > #define DONT_PANIC 0 > > Most people out there are not using a C debugger to debug Hugs or C > code they are calling from Hugs using the ffi so this ought to be > turned off by default and only turned on by the few brave and hardy > souls who indulge. Gdb lets you catch signals even if the application has installed handlers for them: see 'help handle' in gdb. I'd just keep DONT_PANIC turned off - but something should probably be done to detect an infinite loop if Hugs immediately seg faults again (maybe it is, I haven't checked the code). Cheers, Simon

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Mac OS X Jaguar
by Jürgen Schweizer 28 Aug '02

28 Aug '02

Dear Folks, I just began to love hugs (and Haskell of course), but now I am no longer able to use it after upgrading Mac OS X to Version 10.2 (reinstalling hugs was no help). I'm sure that someone with a sound working knowledge of Unix (hence not me) will be able to fix it easily. A site that might provide a hint towards where the problem lies is http://www.michaelandrochellessite.com/about/michael/blog/tech. Specifically the blog "Jaguar upgrade: terminal problem". Thanks for providing binaries for Mac OS X! Juergen

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RE: Seg Fault
by Simon Marlow 27 Aug '02

27 Aug '02

> Probably a stack overflow which, unfortunately, causes Hugs > to segfault. I presume this is the C stack overflowing, right? One possibility, albeit a very non-portable one, to catch SIGSEGV and make a good guess as to whether it was caused by a stack overflow or not. Generating a beter error message in this case might help eliminate a few bug reports... Cheers, Simon

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Re: Downloading Hugs
by Tammo Ricklefs 27 Aug '02

27 Aug '02

Hello, I worked with hugs on an Apple-iBook with System 10.1.x and it worked fine. Now I updated to 10.2 and ist not possible to start hugs in the terminal. The binaries are still at usr/local/bin but wenn I tried to start hugs the terminal tells me, hugs is no command. Can you help me. How can I get hugs to work? thank you Tammo Ricklefs

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install bug an cygwin, hugs98-Dec2001
by Jan Tisje 26 Aug '02

26 Aug '02

hi, your comment on compiling using cygwin is rather old. it would work by just using the unix-method, if the stupid installation routine would add an ".EXE" to the files before trying to move them to the installation dir. in the /src/Makefile.in are some "@EXE@" strings. But there is nobody who makes any use of them. just replacing them with a ".EXE" looked better, but did not help. it still crashes with: [...]hugs/src$ make install unix/install-sh -d [...]hugs/bin unix/install-sh hugs [...]hugs/bin mv: preserving times for `[...]hugs/bin/#inst.1468#': No such file or directory mv: cannot unlink `hugs': No such file or directory mv: cannot remove `hugs': No such file or directory make: *** [install_bin] Error 1 is there anybody who can fix that? thanks Jan

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