December 2002 - Nhc-bugs

How to make System Calls in NHC98?
by Alberto 02 Jan '03

02 Jan '03

Hi :) , I am creating a tiny app in Haskell to search for a directory in the tree and change the current shell directory just to learn to program better in Haskell and I've always used the Win/Hugs98 interpreter but I've just moved to FreeBSD/NHC98 because I want binary code and the thing is I can't find a function in NHC98 to make a pipe to comunicate with the shell (csh in my case) and that's the question: are the FreeBSD pipes functionality available in NHC98? By the way, can one make arbitrary System Calls in NHC98 by any means? if no, how can I change the shell's current directory? Regards, Alberto Dominguez (Spain)

2 1

Problems building hmake
by Bryn Keller 02 Jan '03

02 Jan '03

Hi folks, I'm trying to build hmake, so I can build HaXml. I'm running a Windows 2000 system with the latest Cygwin (as of this morning) and GHC-5.04.2. I'm having some trouble with the cygwin path that's passed to GHC during the build process: $ make cd src/hmake; make HC=ghc install config make[1]: Entering directory `/temp/hmake-3.06/src/hmake' ghc -package lang -c -o /cygdrive/c/temp/hmake-3.06/targets/ix86-CYGWIN_NT-5.0/obj/hmake/QSort.o QSort.hs d:\ghc\ghc-5.04.2\bin\ghc.exe: error: directory portion of "/cygdrive/c/temp/hmake-3.06/targets/ix86-CYGWIN_NT-5.0/obj/hmake/QSort.o" does not exist (used with "-o" option.) make[1]: *** [/cygdrive/c/temp/hmake-3.06/targets/ix86-CYGWIN_NT-5.0/obj/hmake/Q Sort.o] Error 1 make[1]: Leaving directory `/temp/hmake-3.06/src/hmake' make: *** [targets/ix86-CYGWIN_NT-5.0/hmake-ghc] Error 2 I did find this bit of advice (linked from the NHC page, not the hmake page, btw): The build system for nhc98 uses an absolute pathname as the destination of a compile command. This is one of the areas where Cygwin and GHC can conflict if you are not careful. The important thing to remember is that the location in which you unpack the nhc98 distribution must have the same absolute filepath in both Cygwin and Windows. For instance, a Cygwin mount that maps C:\tmp to /tmp will work fine, whereas a mount that maps C:\cygwin\tmp to /tmp will probably not work. So I did this: mount c:\\temp /temp cd /temp make clean ./configure and edited the path (BUILDDIR) in config.cache to reflect this new situation. However, the path that it's passing to GHC is still the old /cygdrive path. How should I correct this? Thanks in advance, Bryn

2 1

Record typing bug
by Simon Marlow 18 Dec '02

18 Dec '02

The following program causes a type error with nhc98: module Test where type S a = a data T a = A { f :: a } | B { f :: S a } ~/scratch > nhc98 test.hs /home/simonmar/fp/bin/i386-unknown-linux/nhc98: test: -ne: unary operator expected ====== Errors after type inference/checking: Type error (type-variable occurrence check fails) when binding final type to function at 5:16. I get the "test: -ne ..." error every time I start nhc98, so it's probably unrelated. I'm not quite sure which version of nhc98 I have here: > nhc98 --version /home/simonmar/fp/bin/i386-unknown-linux/nhc98: 2.01 [ config: ix86-Linux/ by simonmar(a)cam-01-unx.europe.corp.microsoft.com on 22 Aug 2002 ] Cheers, Simon

2 1

Linker flags and nhc98
by Roland Dowdeswell 09 Dec '02

09 Dec '02

I have been using nhc98 on my systems for a while and I've noticed a couple of things that would fit quite nicely in the nhc98 script. The first is the ability to pass a -static to the linker to create statically linked executables. This is helpful in a number of situations, mainly on my web server which I run chroot'ed and so it doesn't have access to as many libraries. The other is the ability to specify the -rpath, the runtime linker path. For this, I used the standard C syntax, i.e. -Wl,foo will pass foo to the linker. The inclusion of this syntax will allow for many other linker options to be passed in as well. Please consider the attached patch. Thanks, -- Roland Dowdeswell http://www.Imrryr.ORG/~elric/ Index: nhc98.inst =================================================================== RCS file: /cvs/nhc/script/nhc98.inst,v retrieving revision 1.38 diff -u -r1.38 nhc98.inst --- nhc98.inst 2002/11/04 15:21:12 1.38 +++ nhc98.inst 2002/12/09 05:30:19 @@ -203,12 +203,14 @@ ;; -H* ) HEAP=`echo $1 | cut -c3-` ;; -[Ll]*) EXTRALIB=$EXTRALIB" "$1;; + -Wl,*) LDFLAGS=$LDFLAGS" "$1;; -i* ) CINCDIRS=$CINCDIRS" -I"`echo $1 | cut -c3-` HINCDIRS=$HINCDIRS" -I"`echo $1 | cut -c3-` ;; -I* ) CINCDIRS=$CINCDIRS" "$1 # HINCDIRS=$HINCDIRS" "`filepath $1` ;; HINCDIRS=$HINCDIRS" "$1 ;; -s ) LDFLAGS=$LDFLAGS" "$1;; + -static) LDFLAGS=$LDFLAGS" "$1;; # -P* ) GREENCARDOPTS=$GREENCARDOPTS" "`filepath $1` # COMPFLAGS=$COMPFLAGS" "`filepath $1`;; -P* ) GREENCARDOPTS=$GREENCARDOPTS" "$1

2 1