[Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
Very, very helpful Chris; thanks; and thanks also to the many other helpful haskellers. They have (hopefully working) cabal files to make compiling and installing ea\ sy. Unfortunately, not so easy, for PCRE.regex. But hopefully this is just due to my ignorance and there's a simple workaround. At any rate, after darcs --getting as you suggested, I ran make, and got various complaints. I installed haddock, happy, alex, hat, c2hs, and cpphs with apt-get. But was unable to find a deb repository for greencard, the final requirement with apt-cache search. I then downloaded the latest version of greencard wget http://www.haskell.org/greencard/downloads/greencard-latest-src.tar.gz and ran sudo make install install-pkg It chugged along for a while, but finally errored out with ghc -package-name greencard -cpp -fglasgow-exts -fno-prune-tydecls -prof -c Foreign/GreenCard.hs -o Foreign/GreenCard.p_o -hisuf p_hi ghc-6.4.1: unrecognised flags: -fno-prune-tydecls I then googled, but found nothing for no-prune-tydecls or no-prune-typedecls (thinking it might be a typo) Anybody out there can help me get greencard working, so I (and all us perlers) can start using PCRE from haskell? thomas. Chris wrote: I think if you paste the subRegex code above underneath an import Text.Posix.PCRE declaration then you get what you are looking for. To install: The regex-* package hosting is via darcs and has been copied/moved to http://darcs.haskell.org/packages/ (The stable regex-* versions) http://darcs.haskell.org/packages/regex-unstable/ (The unstable regex-* vers\ ions) so darcs get --partial http://darcs.haskell.org/packages/regex-pcre; might b\ e useful. They have (hopefully working) cabal files to make compiling and installing ea\ sy. Note that regex-pcre and regex-tre need libpcre and libtre to be installed separately. regex-posix needs a posix library, but GHC already provides this package with a working libary. -- View this message in context: http://www.nabble.com/trivial-function-application-question-tf2922232.html#a8192328 Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC performance of 64-bit
On Fri, 2007-01-05 at 17:51 +, Pedro Baltazar Vasconcelos wrote: Hello all, I noticed that GHC generates slower code on an Linux amd64 bit platform than the 32-bit version on a cheaper 32-bit machine. CPUTime for running sieve of Erathostenes to generate 10,000 primes: Athlon XP 2800 (32-bit): 7.98 secs Athlon 64 3800 (64-bit): 10.29 secs This is using GHC 6.6 on the 64-bit machine and 6.4.1 on the 32-bit one. I googled around and could not find any information regarding degraded performance of ghc/haskell on 64-bit machines. Any ideas? I would suggest re-running that with GHC 6.6. x86-64 support was only really added in GHC 6.4.1 (in 6.4 it only worked for really simple programs). However some general info: memory usage is mostly doubled as every pointer and integer goes from 4 to 8 bytes. Duncan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC performance of 64-bit
On Sat, Jan 06, 2007 at 10:31:08AM +, Duncan Coutts wrote: On Fri, 2007-01-05 at 17:51 +, Pedro Baltazar Vasconcelos wrote: Athlon XP 2800 (32-bit): 7.98 secs Athlon 64 3800 (64-bit): 10.29 secs This is using GHC 6.6 on the 64-bit machine and 6.4.1 on the 32-bit one. ^ I would suggest re-running that with GHC 6.6. x86-64 support was only really added in GHC 6.4.1 (in 6.4 it only worked for really simple programs). He can only switch to 6.6 on the 32-bit machine, so the difference can only get bigger :-) Best regards Tomasz ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
tphyahoo wrote: Very, very helpful Chris; thanks; and thanks also to the many other helpful haskellers. They have (hopefully working) cabal files to make compiling and installing ea\ sy. Unfortunately, not so easy, for PCRE.regex. But hopefully this is just due to my ignorance and there's a simple workaround. I think that it is simpler than you think. Cabal is confusing you. At any rate, after darcs --getting as you suggested, I ran make, and got various complaints. I installed haddock, happy, alex, hat, c2hs, and cpphs with apt-get. Well, the Makefile is just sugar for the Cabal Setup.hs file. Running --configure notices that many things are not installed, but this is just noise from Cabal. With my development directory I get this output from ./setup --configure: Configuring regex-pcre-0.80... configure: /usr/local/bin/ghc-pkg configure: Dependency base=2.0: using base-2.0 configure: Dependency regex-base-any: using regex-base-0.71 configure: Using install prefix: /usr/local configure: Binaries installed in: /usr/local/bin configure: Libraries installed in: /usr/local/lib/regex-pcre-0.80/ghc-6.6 configure: Private binaries installed in: /usr/local/libexec configure: Data files installed in: /usr/local/share/regex-pcre-0.80 configure: Using compiler: /usr/local/bin/ghc configure: Compiler flavor: GHC configure: Compiler version: 6.6 configure: Using package tool: /usr/local/bin/ghc-pkg configure: Using ar found on system at: /usr/bin/ar configure: Using haddock found on system at: /usr/local/bin/haddock configure: No pfesetup found configure: Using ranlib found on system at: /usr/bin/ranlib configure: Using runghc found on system at: /usr/local/bin/runghc configure: No runhugs found configure: No happy found configure: No alex found configure: Using hsc2hs: /usr/local/bin/hsc2hs configure: No c2hs found configure: No cpphs found configure: No greencard found This is sufficient to compile regex-pcre so long as you also have libpcre where ghc will find it. The main this is that it found ghc-6.6 and the hsc2hs and ghc-pkg that came with ghc. Specifically commands to run: make setup # this means Setup.hs is compiled once into setup for speed ./setup --configure -p --user --prefix=/where/you/want/it ./setup build ./setup install --user ./setup clean If you really want it to be global, then remove the --user and --prefix and install with sudo. Also, ./setup --help is useful. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Redefining superclass default methods in a subclass
Bulat Ziganshin wrote: Hello Brian, Thursday, January 4, 2007, 10:00:05 PM, you wrote: deeper, the programmer is burdened more and more by the need to cut-and-paste method definitions between instances because Haskell doesn't allow a superclass (or ancestor class) method default to be redefined in a subclass. i've runned into this problem with Streams library. finally i've decided to wrote bodies of such methods outside of class: [example snipped] Hello Bulat, Thanks for the workaround, which solves the need to copy and paste method bodies though not the problem of having to write out instance decls for a potentially large chain of classes leading to the subclass of interest. Part of the motivation for proposing that a superclass method default could be redefined in a subclass (or a particular instance) is that it would allow some refactorings of the class hierarchy without affecting code that just uses the subclass - in particular it would allow existing code using Monad to compile unchanged even when Monad moved down to Functor = Applicative = Monad because return and = are enough to get completely defined instances for Functor and Applicative. Best regards, Brian. -- http://www.metamilk.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Stupid newbie question
Brian Hurt wrote: nth 0 (x:xs) = Some x nth i (x:xs) = if i 0 then Empty else nth (i-1) xs nth i [] = Empty [blows stack on large i] As other people have pointed out, this is due to laziness. I'd write it like: nth 0 (x:_) = Some x nth i (_:xs) = of i 0 then Empty else (nth $! i-1) xs nth _ [] = Empty where a general rule of thumb is always to replace (fun intexp) by (fun $! intexp) whenever intexp is just a trivial arithmetic expression that doesn't involve traversing (ie forcing of) any other data structure. Brian. -- http://www.metamilk.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Stupid newbie question
Brian Hulley wrote: Brian Hurt wrote: nth 0 (x:xs) = Some x nth i (x:xs) = if i 0 then Empty else nth (i-1) xs nth i [] = Empty [blows stack on large i] As other people have pointed out, this is due to laziness. I'd write it like: nth 0 (x:_) = Some x nth i (_:xs) = of i 0 then Empty else (nth $! i-1) xs ^^^ -- oops! nth _ [] = Empty I think the above code would be more efficient written as: nth n xs = if n 0 then Empty else nth' n xs where nth' 0 (x:_) = Some x nth' i (_:xs) = (nth' $! i - 1) xs nth' _ _ = Empty since the first 2 cases deal with every situation where we've got a non-empty list and an index = 0 (so no need to keep checking that the index is = 0 in the second case - instead the test can be moved outside the loop) and there's no need to pattern match against [] in the last case because we already know this must be an empty list. (Though in general it's probably a good idea to make each pattern as independent as possible when writing a function so that if some cases of a function are later edited there's more chance of the compiler being able to lead you to errors via the incomplete patterns warning - hopefully the compiler can optimize out any redundant checks) Brian. -- http://www.metamilk.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Stupid newbie question
Brian Hulley wrote: Brian Hulley wrote: Brian Hurt wrote: nth 0 (x:xs) = Some x nth i (x:xs) = if i 0 then Empty else nth (i-1) xs nth i [] = Empty [blows stack on large i] As other people have pointed out, this is due to laziness. I'd write it like: nth 0 (x:_) = Some x nth i (_:xs) = of i 0 then Empty else (nth $! i-1) xs ^^^ -- oops! nth _ [] = Empty Actually I see I should have read Jeremy Shaw's answer more carefully before giving my own since I'd missed the point about the problem being with the list itself not the decrementing of (i) (which wouldn't be a problem since it is immediately forced on the next iteration by the comparison of i to 0). The answer therefore lies in the laziness of the makelist function which could be solved by: makelist i = i : (makelist $! i - 1) Jeremy Shaw wrote: pps. I didn't explain why [1..100] works, but [1..] fails, because I don't know :) It's a bit suprising to me... I think this might be because the code that produces the list [1..100] would have to be something like: produce n i = if i n then i : produce n (i +1) else [] so each element of the list is now forced by the comparison with n, so even though the end of the list will be a thunk when 100 has not yet been reached, none of the elements are thunks. Anyway it was certainly not a stupid question - thanks for asking it. Best regards, Brian. -- http://www.metamilk.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
On 06/01/07, Chris Kuklewicz [EMAIL PROTECTED] wrote: Running --configure notices that many things are not installed, but this is just noise from Cabal. This is the second time I've seen someone get confused by these messages. I propose we add a 'Configuration successful, now type runhaskell Setup.hs build.' to the bottom of the configure output. -- -David House, [EMAIL PROTECTED] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] trouble installing ghc 6.6: xargs: /usr/bin/ar: terminated by signal 11
I'm having trouble installing ghc 6.6. On ubuntu, virtual server (user mode linux). Something seems to be killing the process, no idea why. Anyone seen this? I looked around with ps to see if anything looked suspicious. I do have a lot of screens open, but I don't see why that should matter. There is no instance of haskell or gnci running. after running configure with no problem. ~$ cd ghc-6.6/ ~/ghc-6.6$ sudo make makeOut Password: ~/ghc-6.6$ tail -n8 makeOut (echo Control/Concurrent_stub.o System/CPUTime_hsc.o System/Time_hsc.o ; /usr/bin/find Control/Applicative_split Control/Arrow_split Control/Concurrent_split Control/Concurrent/Chan_split ...long mess... Text/PrettyPrint/HughesPJ_split Text/Printf_split Text/Read_split Text/Read/Lex_split Text/Show_split Text/Show/Functions_split -name '*.o' -print) | xargs /usr/bin/ar q libHSbase.a /usr/bin/ar: creating libHSbase.a xargs: /usr/bin/ar: terminated by signal 11 make[2]: *** [libHSbase.a] Error 125 make[2]: *** Deleting file `libHSbase.a' make[1]: *** [all] Error 1 make[1]: Leaving directory `/home/thartman/ghc-6.6/libraries' make: *** [stage1] Error 2 ~/ghc-6.6$ -- View this message in context: http://www.nabble.com/trouble-installing-ghc-6.6%3A-xargs%3A--usr-bin-ar%3A-terminated-by-signal-11-tf2932856.html#a8199860 Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing ghc 6.6: xargs: /usr/bin/ar: terminated by signal 11
On Sat, Jan 06, 2007 at 03:30:56PM -0800, tphyahoo wrote: I'm having trouble installing ghc 6.6. On ubuntu, virtual server (user mode linux). Something seems to be killing the process, no idea why. Anyone seen this? xargs: /usr/bin/ar: terminated by signal 11 make[2]: *** [libHSbase.a] Error 125 make[2]: *** Deleting file `libHSbase.a' make[1]: *** [all] Error 1 make[1]: Leaving directory `/home/thartman/ghc-6.6/libraries' make: *** [stage1] Error 2 ~/ghc-6.6$ Is it repeatable? i.e. If you run 'make' again, do you get the same error at the same place? If you answer 'no', swap out all your RAM and try again. Unexplained sig11's are the classic first symptom of failing memory, soon followed by filesystem corruption and data loss. I wish I'd paid attention when I had my first weird crash. :( (there are other possibilities, but they usually won't be fixed by replacing the memory and usually will be repeatable.) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing ghc 6.6: xargs: /usr/bin/ar: terminated by signal 11
At Sat, 6 Jan 2007 15:41:37 -0800, Stefan O'Rear wrote: On Sat, Jan 06, 2007 at 03:30:56PM -0800, tphyahoo wrote: I'm having trouble installing ghc 6.6. On ubuntu, virtual server (user mode linux). Is it repeatable? i.e. If you run 'make' again, do you get the same error at the same place? If you answer 'no', swap out all your RAM and try again. Unexplained sig11's are the classic first symptom of failing memory, soon followed by filesystem corruption and data loss. I wish I'd paid attention when I had my first weird crash. :( In my experience bad memory causing signal 11 can even be very repeatable. If you haven't tried a memory test yet, memtest86 and its derivatives are a good place to start. memtest86, memtest86+, and a bunch of other hardware diagnostics can be found on this (free as in beer) cd: http://www.ultimatebootcd.com/ j. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
dmhouse: On 06/01/07, Chris Kuklewicz [EMAIL PROTECTED] wrote: Running --configure notices that many things are not installed, but this is just noise from Cabal. This is the second time I've seen someone get confused by these messages. I propose we add a 'Configuration successful, now type runhaskell Setup.hs build.' to the bottom of the configure output. I agree. This issue is even mentioned here: www.serpentine.com/blog/2007/01/05/getting-started-with-installing-third-party-haskell-packages/ Those new to Cabal always seem to assume things are going badly when happy not found. We need to address the psychological aspect of Cabal's config process :) -- Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
On Sun, Jan 07, 2007 at 12:44:46PM +1100, Donald Bruce Stewart wrote: dmhouse: On 06/01/07, Chris Kuklewicz [EMAIL PROTECTED] wrote: Running --configure notices that many things are not installed, but this is just noise from Cabal. This is the second time I've seen someone get confused by these messages. I propose we add a 'Configuration successful, now type runhaskell Setup.hs build.' to the bottom of the configure output. I agree. This issue is even mentioned here: www.serpentine.com/blog/2007/01/05/getting-started-with-installing-third-party-haskell-packages/ Those new to Cabal always seem to assume things are going badly when happy not found. We need to address the psychological aspect of Cabal's config process :) But it's not enough to just say Ignore any errors above. Some packages really do need happy (or some other tool) to build. Cabal would need to crawl over the source files to see what preprocessors are really needed. (It does that in the build phase, but not configure.) If haddock is absent, you can build and install, but not build documentation. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
Donald Bruce Stewart writes: dmhouse: This is the second time I've seen someone get confused by these messages. I propose we add a 'Configuration successful, now type runhaskell Setup.hs build.' to the bottom of the configure output. I agree. This issue is even mentioned here: www.serpentine.com/blog/2007/01/05/getting-started-with-installing-third -party-haskell-packages/ Those new to Cabal always seem to assume things are going badly when happy not found. We need to address the psychological aspect of Cabal's config process :) Perhaps it would be better not to print the missing component messages by default. There could be a verbose option to turn them back on. -- David Menendez [EMAIL PROTECTED] | In this house, we obey the laws http://www.eyrie.org/~zednenem |of thermodynamics! ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )
Em Dom, 2007-01-07 às 02:07 +, Ross Paterson escreveu: On Sun, Jan 07, 2007 at 12:44:46PM +1100, Donald Bruce Stewart wrote: dmhouse: On 06/01/07, Chris Kuklewicz [EMAIL PROTECTED] wrote: Running --configure notices that many things are not installed, but this is just noise from Cabal. This is the second time I've seen someone get confused by these messages. I propose we add a 'Configuration successful, now type runhaskell Setup.hs build.' to the bottom of the configure output. I agree. This issue is even mentioned here: www.serpentine.com/blog/2007/01/05/getting-started-with-installing-third-party-haskell-packages/ Those new to Cabal always seem to assume things are going badly when happy not found. We need to address the psychological aspect of Cabal's config process :) But it's not enough to just say Ignore any errors above. Some packages really do need happy (or some other tool) to build. Cabal would need to crawl over the source files to see what preprocessors are really needed. (It does that in the build phase, but not configure.) If haddock is absent, you can build and install, but not build documentation. Maybe if in the Cabal file was specified what's needed for compiling the package, this would not happen. -- malebria Marco Túlio Gontijo e Silva Correio (MSN): [EMAIL PROTECTED] Jabber (GTalk): [EMAIL PROTECTED] Telefone: 33346720 Celular: 98116720 Endereço: Rua Paula Cândido, 257/201 Gutierrez 30430-260 Belo Horizonte/MG Brasil ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
