September 2003 - Glasgow-haskell-users

HOpenGL :(
by Arunkumar S Jadhav 21 Sep '03

21 Sep '03

Hi all, I just installed ghc-6.0.1 which apparantly comes built in with HOpenGL (In any case I've HOpenGL installed). But the simple Hello.hs which comes as example in HOpenGL package didn't compile. When I do $ ghc -package HOpenGL --make Hello.hs I get the following error ghc-6.0.1: unknown package name: HOpenGL Now, how to overcome this, will be great if someone can post the solution to this. Regards, Arun Kumar S Jadhav Masters Student, SIC-309, KReSIT, IIT-Bombay, India Ph: +91-22-25764967 http://www.it.iitb.ac.in/~arunk

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Hi
by mets 20 Sep '03

20 Sep '03

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segfault with heap profiling.
by David Roundy 20 Sep '03

20 Sep '03

I've been getting a segfault whenever I try to run my program with +RTS -hc (having compiled with profiling enabled). Any idea what might cause this, or how I might track it down? I am using ghc 6.0.1, and see this problem on both linux (debian testing) and macos X. On macos X the crash log looks like it's crashing in heapCensusChain. My program uses ForeignPtrs quite a bit, so my only (rather weak) theory is that perhaps the profiler is trying to look at the contents of my ForeignPtrs? In a sort of related question, is there any way I can make the heap size decrease? In my test case, the memory usage peaks pretty early, and then it keeps running for another few hours. It would be nice if it could shrink the heap again to release swap. And actually, even though according to +RTS -Sstderr my live memory usage drops, the heap size (as seen by top) keeps going up (a megabyte every second or so) until the process gets killed because it's eaten up all the swap and memory. :( I suspect the problem may be in the allocation I'm doing via ForeignPtrs, but I'm not sure how to track anything down without profiling working. Any suggestions would be appreciated. -- David Roundy http://www.abridgegame.org

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my 2p's worth...
by MR K P SCHUPKE 20 Sep '03

20 Sep '03

Would it not be better to have control over exactly where these options apply, could you not have: {-# OPTIONS fallow-overlapping-instances=true #-} ... some code ... {-# OPTIONS -fallow-overlapping-instances=false #-} ... more code ... So you can ensure instances you don't want overlapping cannot? Regards, Keean.

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IMPORTANT
by wolny_olkusz＠latinmail.com 19 Sep '03

19 Sep '03

Good Day, With warm heart I offer my friendship, and my greetings, and I hope this letter meets you in good time. It will be surprising to you to receive this proposal from me since you do not know me personally. However, I am sincerely seeking your confidence in this transaction, which I propose with my free mind and as a person of integrity. My name is Wolny Olkusz, the first son of Paul Olkusz, of the most popular black farmer from Zimbabwe, murdered in the land dispute in my country. As led by my instict, I decided to contact you through email, after searching for contacts via the internet, as it is the only means I can contact anybody since I am cutting off ties with Zimbabwe for security and safety reasons. However, I apologize if this is not acceptable to you. The purpose of this letter is to seek your most needed assistance in a business venture. Due to the land and political problems in Zimbabwe, as a result of President Robert Mugabe's introduction of new Land Act Reform wholly affecting the rich white farmers and the few rich black farmers, and his desire to hold on to power for life, my father for saw the danger that came in Zimbabwe. Before he was murdered, he withdrew all of our business foreign accounts in dollars and sold up our shares in major companies. We then went to SOUTH AFRICA to deposit the sum of US$14.5 million (Fourteen million, Five Hundred thousand US dollars), in a private security company. This money was deposited with this Private Security company for safety and security reasons, and was to be used for the purchase of land, new machines and chemicals establishment of new farms in Europe. President Mugabe's support for the violent Zimbabwean war veterans and some lunatics in the society, led to the murder of my beloved father and other innocent lives. I was continually threatened to abandon my inheritance from my father after he was murdered. I resited for a while, but when the danger became unbearable, and I survived two murder attempts, I fled Zimbabwe. I am currently staying in the Holland where I am seeking political asylum. In fact my decision to come here to seek asylum, is because the security company from South Africa, has a branch holland and they have moved the deposit from their office in Johannesburg down here. I need to transfer this money to an account and invest part of the money. Since the law of Netherland prohibits a refugee (asylum seeker) to open any bank account or to be involved in any financial transaction, this is why I am seeking a genuine and reliable partner, whose account this money can be transferred, hence this proposal to you.You have to understand that this decision taken by me entrusts my future and in your hands, as a result of the safe keeping of this money. If you accept to assist me, all I want you to do for me, is to assist with arrangements to claim the deposit from the security company from their office in Netherlands, as it has now been transfered from Johannesburg, South Africa to their branch here. The company will be legally informed of you representing me. For your assistance, I have two options for you. Firstly you can choose to have 10% of the money for your assistance, and helping me open an account for the money to be deposited here, or you can go into partnership with me for the proper profitable investment of the money in your country. Whichever the option you want, please to notify me in your reply. I have also set aside 1%($145,000,00) of this money for all kinds of expenses that come our way in the process of this transaction, and 4% ($580,000,00) for Charity donation. If you prefer to accept the 10or assisting with opening an account, then 85%will be left in the account here for me. Please, I want you maintain the absolute secrecy for the purpose of this transaction. I look forward to your reply and co-operation, and I thank you in advance as I anticipate your co-operation.You can reach me on my direct line which is 31-630-854-650 or via email, wolny_olkusz(a)latinmail.com Sincerely, Wolny Olkusz.

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RE: Placement of OPTION pragmas
by Simon Marlow 19 Sep '03

19 Sep '03

> On Fri, 19 Sep 2003 14:27:19 +0100 > "Simon Marlow" <simonmar(a)microsoft.com> wrote: > > > We could make it understand comments, but that adds extra > > complication (nested comments, maximal munch for '--' > comments, etc.). > > Hmm. > > Nested comments yes, I see how that'd be a problem. > > But surely it wouldn't be hard to ignore lines matching "^\s*--"? A technical point: matching line comments is a bit more tricky than that. Eg. GHC's lexer uses the following regular expression: "--"\-* ([^$symbol] .*)? Actually the easy way to do this would be to invoke the lexer to look for the OPTIONS pragma. I think we can now do this with the new lexer - I'll look into it. Cheers, Simon

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RE: Placement of OPTION pragmas
by Simon Marlow 19 Sep '03

19 Sep '03

> > OPTIONS pragmas are only looked for at the top of your source files, > > upto the first (non-literate,non-empty) line not containing > OPTIONS. > > Why doesn't "non-empty" include comment-only lines? One concrete reason for this is that the code which looks for '{-# OPTIONS' isn't the full Haskell lexer, so it doesn't understand comments. We could make it understand comments, but that adds extra complication (nested comments, maximal munch for '--' comments, etc.). Cheers, Simon

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RE: stg_ap_v_ret porting crash: solved?
by Simon Marlow 19 Sep '03

19 Sep '03

> Numerous additions to configure/configure.in. I can add these > in CVS, but I'm not sure if I should add > > +s390-ibm-linux*) > + HostPlatform=s390-ibm-linux > + TargetPlatform=s390-ibm-linux #hack > + BuildPlatform=s390-ibm-linux #hack > + HostPlatform_CPP='s390_ibm_linux' > + HostArch_CPP='s390' > + HostVendor_CPP='ibm' > + HostOS_CPP='linux' > + ;; > > as it is or with unknown instead of ibm? Not a big deal, I'll leave this up to you. I don't think we ever discriminate based on the vendor. > alpha: > > --- ghc6-6.0.1.orig/ghc/includes/Stg.h > +++ ghc6-6.0.1/ghc/includes/Stg.h > @@ -33,6 +33,8 @@ > # endif > #endif > > +#include "TailCalls.h" > + > /* Configuration */ > #include "config.h" > > @@ -186,7 +188,6 @@ > #include "SMP.h" > #include "MachRegs.h" > #include "Regs.h" > -#include "TailCalls.h" > #include "Block.h" > > /* RTS public interface */ > > > --- ghc6-6.0.1.orig/ghc/includes/TailCalls.h > +++ ghc6-6.0.1/ghc/includes/TailCalls.h > @@ -83,7 +83,9 @@ > > #ifdef alpha_TARGET_ARCH > > +#ifdef IN_STG_CODE > register void *_procedure __asm__("$27"); > +#endif > > #define JMP_(cont) \ > do { _procedure = (void *)(cont); \ I'm a bit suspicious about taking a whole register globally just to do tailcalls. Someone needs to investigate this. > > alpha and hppa (probably): > > --- ghc6-6.0.1.orig/ghc/includes/PrimOps.h > +++ ghc6-6.0.1/ghc/includes/PrimOps.h > @@ -254,7 +254,7 @@ > EXTFUN_RTS(catchzh_fast); > EXTFUN_RTS(raisezh_fast); > > -extern void stg_exit(I_ n) __attribute__ ((noreturn)); > +extern void stg_exit(int n) __attribute__ ((noreturn)); This has been fixed in the HEAD. The other patches look fine: commit away, I'll merge into 6.2. Cheers, Simon

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RE: stg_ap_v_ret porting crash: solved?
by Simon Marlow 19 Sep '03

19 Sep '03

> 1.- OK. The "distrib/hc-build" migth not handle the > dependencies soundly. What do you mean here? Could you elaborate? > Now I build on the target T as in the host H: > > cd hslibs/ && gmake boot && gmake > cd ghc && gmake boot && gmake > > The "touch config.h" patch seems to solve the stg_ap_v_ret bug... > > 2.- Now the problem seems to be another one: > > bash-2.05$ ghc/compiler/ghc-inplace hello.hs > > crash, and tracing the core it seems a problem having to do with gmp > software: > > bash-2.05a$ gdb ghc-6.0.1 core > > # 0x1153a208 in __decodeFloat () > > if I apply the "-v" flag, then > > bash-2.05$ ghc/compiler/ghc-inplace -v hello.hs > bash-2.05a$ gdb ghc-6.0.1 core > > # 0x11554ae4 in __gmpn_tdiv_qr / ( qp=0x454ed518 ...) > > Any idea ? Adding -v shouldn't make any difference! Try using a debugging version of the RTS (see mk/config.mk for instructions). Is the build attempting to use an already-installed copy of GMP, or is it building the one in the tree? > 3) Simon M. : For the time beeing this is the patch you can integrate > safely into the CVS repository . I have read-only > permissions. There is no doubt on it. Thanks. I noticed that this was the same as the Solaris case, so I merged the two. Cheers, Simon

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Placement of OPTION pragmas
by Juanma Barranquero 19 Sep '03

19 Sep '03

A very small nitpick: > OPTIONS pragmas are only looked for at the top of your source files, > upto the first (non-literate,non-empty) line not containing OPTIONS. Why doesn't "non-empty" include comment-only lines? I usually start source files with the equivalent of: ----------------------------------------------- -*- mode: Haskell -*- -- -- -- -- My Program -- -- -- -- Description: This program does this and that -- -- -- -- Author: Me -- -- Copyright (C) 2003 By Me -- -- -- ------------------------------------------------------------------------ and currently {-# OPTIONS ... #-} must be before the header... Juanma

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