- Glasgow-haskell-users

Re: Andy Gill's Html library
by Albert Lai 26 Jun '02

26 Jun '02

"Thomas L. Bevan" <tom(a)regex.com.au> writes: > Can someone explain the reasoning behind using > a function to describe a Table rather than just a list of lists? Just my feeling, but perhaps it is essentially the same reason why ShowS is String -> String rather than String, so that concatenation becomes efficient?

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GHCI Can't Find Module But GHC Can
by Dominic Steinitz 25 Jun '02

25 Jun '02

When I run ghc, everything works fine. ghc -o test1 test1.hs -i../lib -I../lib SVG-part1.o SVG-part2.o ../lib/*.o -package lang But when I run ghci it tells me it can't find a module. Is there anything I can do to stop this? Dominic. ghci test1.hs -i../lib -I../lib SVG-part1.o SVG-part2.o ../lib/*.o -package lang ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 5.02.3, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package std ... linking ... done. Loading package lang ... linking ... done. Loading object (static) SVG-part1.o ... done. Loading object (static) SVG-part2.o ... done. Loading object (static) ../lib/Haskell2Xml.o ... done. Loading object (static) ../lib/ParseSTLib.o ... done. Loading object (static) ../lib/Pretty.o ... done. Loading object (static) ../lib/Xml2Haskell.o ... done. Loading object (static) ../lib/XmlCombinators.o ... done. Loading object (static) ../lib/XmlHtmlGen.o ... done. Loading object (static) ../lib/XmlHtmlParse.o ... done. Loading object (static) ../lib/XmlLex.o ... done. Loading object (static) ../lib/XmlLib.o ... done. Loading object (static) ../lib/XmlPP.o ... done. Loading object (static) ../lib/XmlParse.o ... done. Loading object (static) ../lib/XmlTypes.o ... done. final link ... done. can't find module `IOMisc' Prelude> Dominic Steinitz

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compiling hmake on Mac OS X
by Kristofer Johannisson 25 Jun '02

25 Jun '02

I would just like to check if anyone on the list has managed to compile the tool hmake with ghc (version 5.03) on Mac OS X? I'm having some trouble with this (even though I got some hints from Malcolm Wallace, the author of hmake), and I would like to find out if my troubles are related to ghc on OS X, or to something else. / Kristofer Johannisson

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Apologies
by Thomas L. Bevan 25 Jun '02

25 Jun '02

My email client has gone mad.

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RE: GHC and the FFI
by Simon Marlow 25 Jun '02

25 Jun '02

> Should GHC 5.02.3 support the latest version of the FFI or is > that still only in CVS? Only in CVS (and forthcoming 5.04). Cheers, Simon

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GHC and the FFI
by Ian Lynagh 25 Jun '02

25 Jun '02

Hi all, Should GHC 5.02.3 support the latest version of the FFI or is that still only in CVS? Thanks Ian

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Re: HGL with GHC in Win32
by C.Reinke 24 Jun '02

24 Jun '02

> >> The size problem is traceable to [Greencard's ffi code generation] > I took a look at this and found that Sigbjorn had fixed it some months > ago Would that be in the released Greencard or only in the cvs version? > Building GDITypes with this command: > > green-card --target=ffi -i. --include-dir ../../green-card/lib/ghc -i . GDITypes.gc > generates correct code for prim_RGB (the problem Hal Daume ran into). > and for Win32Window.adjustWindowRect So the Win32 sources could now be regenerated and future builds and releases wouldn't run into these problems with Win32 or HGL anymore? ------------------------------------------------------------------- >>> Just as long as someone remembers to do the re-greencarding <<< ------------------------------------------------------------------- in cvs: hslibs/win32 before the next release, please, because that won't happen automatically anymore (but then I may be wrong about this - I don't understand the fptools Makefiles, yet;-). Great - thanks, Claus PS. I still have to figure out how to make hslibs/win32 in isolation, so I won't be able to test & confirm whether this solves all the HGL/GHC/Win32 problems for a while (e.g., there was the problem of polygon creation running out of resources, see Friday's email; that could easily be related to the same ffi problem, but it would be good to check) - anyone else in a better position for testing?

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Andy Gill's Html library
by Thomas L. Bevan 24 Jun '02

24 Jun '02

Hi, I've been working through the source code of Andy Gill's Html library for my own edification. Andrew makes the following definitions. \begin{code} instance (Show a) => Show (BlockTable a) where showsPrec p = showsTable type TableI a = [[(a,(Int,Int))]] -> [[(a,(Int,Int))]] data BlockTable a = Table (Int -> Int -> TableI a) Int Int \end{code} You can create a (1x1) table entry \begin{code} single :: a -> BlockTable a single a = Table (\ x y z -> [(a,(x+1,y+1))] : z) 1 1 \end{code} Can someone explain the reasoning behind using a function to describe a Table rather than just a list of lists? Tom

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Re: HGL with GHC in Win32
by C.Reinke 24 Jun '02

24 Jun '02

> Thanks for looking at this Claus. no problem - I'm kind of nearby, and I'm not promising anything (unless just looking at it is going to help;-). > > - the full-screen titlebar effect with the SOE variant suggests > > some window-handling incompatibility, if it wasn't for Hugs and GHC > > using the same graphics source code.. (is there a difference in the > > win32 bindings for Hugs vs GHC?) > > [This mail got rather long. My best guess is that yield on GHC > doesn't yield as thoroughly as on Hugs and that the Win32 library > isn't being greencarded with the --safe-code flag. (Either by itself > would probably be fine, it's having both at once that is probably > killing you.)] According to the docs, yield does as yield should, and the unix version (ghc/hgl/X) seems to work.. Btw, while looking at code with scheduling-related issues in mind, other questions appeared to me: Shouldn't all those IORefs (e.g., for the list of windows) be MVars in the GHC version? For a start, what about NoInline pragmas for global IORefs? But, at least on unix, these don't seem to be the problem.. Unless there are any other suggestions, I could give the green card --safe-code a try. But why doesn't the green card input use %safecode to eliminate that potential error source?-) And how would cross-ffi garbage-collection issues affect window parameters at startup? Anyway, is there a useable win32 green card input package hanging around somewhere (the link to glasgow is dead it seems; CVS has moved the gc-sources aside and has never been very modular - is there a way for me to take the win32/gc-src/ directory from CVS and make it, without having to prepare the various other parts of fptools that fptools-Makefiles tend to depend on so merrily?-(. Alternatively, is anyone out there using ghc's win32 binding? Presumably, that kind of problem would show up in other uses. Claus PS. Is there a way to get system call traces on windows/cygwin?

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RE: compiling libraries with ghc
by Simon Marlow 24 Jun '02

24 Jun '02

> hi, i wrote some utilities to make my coding a little easier > and i put them in some libraries. then to use them i made a > package conf file and added it with ghc-pkg -a. i then tried > compiling them with > > ghc -package-name extensions -c Foo.hs > > but i am not sure i am compiling it right as i get linker > errors of the form > > /usr/libexec/elf/ld: cannot find -lDirectoryAndExtensions > > whenever i try to compile a program that uses my libraries. I can't tell exactly what's wrong from this error message - what does your package conf file look like? > i can fix this by copying all the .o files to libFoo.a files. > what is the right way to compile libraries? You should make a lifFoo.a for static linking, and a single Foo.o for use with GHCi. The documentation on packages in the user guide explains how to do this. Cheers, Simon

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