July 2006 - Glasgow-haskell-users

partially applied type synonyms
by Arie Peterson 05 Mar '12

05 Mar '12

Dear list, Is there a good reason that partially applied type synonyms cannot be made instances of classes? - A simple example would be making the identity type 'Id' ("type Id x = x") instance of 'Monad'. This would eliminate the need for some silly occurrences of 'runIdentity', and perhaps narrow the gap between monads and monad transformers. - The reason I complain about this now is a more involved example, where introducing a newtype to work around the restriction is not an option. Well, not as far as I can see now, anyway. Partially applied type synonyms are, in a sense, the anonymous functions at the type level, and one might argue that they deserve the same 'first-class member status' as the lambda at the value level. Kind regards, Arie Peterson

3 2

GHC 6.4.1 and Win32 DLLs: Bug in shutdownHaskell?
by Michael Marte 24 Oct '06

24 Oct '06

Hello *, before filing a bug report, I want others to comment on my problem. Maybe it's my fault, not ghc's. I wrapped up some Haskell modules in a Win32 DLL. Loading the DLL dynamically (with LoadLibrary) works fine. However, whether I actually use the library or not, the program (an application with MFC GUI) crashes upon termination. To find the reason for the crash, I added a new function for unloading the DLL using FreeLibrary. FreeLibrary works fine, however the program crashes when it returns to the main event loop. Interestingly, when I reload the library (FreeLibrary followed by LoadLibrary) the program continues working. However, every reload cycle causes the virtual size of the process to increase by about 300K and the fourth reload fails with the error message "getMBlock: VirtualAlloc failed with: 8" (appears in a message window) accompanied by many repetitions of the message "Timer proc: wait failed -- error code: 6" (appears on stderr) and followed by the message "getMBlocks: misaligned block returned" (again in a message window). Then the programm crashes. Development takes place on Windows XP Professional using MS Visual Studio 6.0 SP 5 and ghc 6.4.1. There are no references from the C++ side to the Haskell heap. I build the DLL using the command ghc --mk-dll -optdll--def -optdllFoo.def -o Foo.dll Foo.o Foo_stub.o dllMain.c dllMain.c looks as follows: #include <windows.h> #include <Rts.h> extern void __stginit_EUzu3820zu85(void); static char* args[] = { "ghcDll", NULL }; /* N.B. argv arrays must end with NULL */ BOOL STDCALL DllMain(HANDLE hModule, DWORD reason, void* reserved) { if (reason == DLL_PROCESS_ATTACH) { /* By now, the RTS DLL should have been hoisted in, but we need to start it up. */ startupHaskell(1, args, __stginit_Foo); return TRUE; } else if (reason == DLL_PROCESS_DETACH) { shutdownHaskell(); } return TRUE; } I played around with hs_exit instead of shutdownHaskell, I moved initialization and clean-up from DllMain to my library loader, nothing helps. Even doing no clean-up whatsoever does not change the behaviour. Any ideas? Michael

7 16

using ghc with make
by Frederik Eaton 26 Aug '06

26 Aug '06

Hi all, I have a project which currently uses Cabal, and I would like to switch to using a plain Makefile. I have two examples of projects that use Makefiles, darcs and jhc, but they both appear to hand-code the list of dependencies for executables. The "-M" option to ghc should let us do this automatically, but either because of a deficiency in GHC or in GNU Make, that looks to be impossible or difficult. Does anyone have experience with this? Since I'm not using the multi-compiler features of Cabal, I think it shouldn't be too hard to get the project-specific part of my Makefile down to the size of the .cabal file. Many thanks, Frederik P.S. I want to use 'make' rather than Cabal because: - I want to be able to rebuild specific targets, rather than building everything every time - I want better dependency inference, for instance I don't want to relink every executable every time I do a build (I think this is fixed in newer versions of ghc, but not the one I use) - I ultimately want to be able to use a more sophisticated build system than Cabal's. GNU Make is a good first start, because it allows me to run several jobs simultaneously, for instance potentially utilizing multiple processors. In the future, I want to write a build system that does result caching as well. There are a lot of tricks that can be done in build systems, so in general I think it would be good to have a build system which is separable from the domain-specific configuration and compiler logic, rather than coupling them as Cabal and "ghc --make" do. The compile / fix compiler errors cycle is an important part of the development process for me, and so I want recompilation to go as quickly as possible. By the way, the GHC user manual claims that using --make is much faster than using a Makefile, but in a test on a small program, the difference was not significant (16 seconds vs. 18 seconds). Furthermore, some build systems are able to combine targets, e.g. running "ghc -c Bar.hs -c Foo.hs" instead of "ghc -c Bar.hs; ghc -c Foo.hs", which should eliminate the already small difference. -- http://ofb.net/~frederik/

9 23

Lookup module and package defining <<x>?
by Marc Weber 08 Aug '06

08 Aug '06

Has somene already implemented something like: $ghc-pkg --where-from ParseError package parsec: defining modules: Text.ParserCombinators.Parsec.Error, Text.ParserCombinators.Parsec ? lambdabot @index does what I want, but not with my libs installed only locally.. This might be used by any developement system for easily importing modules.. If not I'll start working on this and I'll post again after needing help ;) or finishing It can't be that hard because there is already ghc-pkg list and ghc --show-iface ... Marc

6 7

returning to cost of Integer
by Serge D. Mechveliani 02 Aug '06

02 Aug '06

Dear GHC developers, Long ago you wrote that GHC has made Integer only about 3/2 times slower than Int. I tested this once, and then all this time I have been relying on this. Now, with ghc-6.4.1 compiled for Linux - i386-unknown, running under Debian Linux, Intel Pentium III under ghc -O, I have an occasion to repeat the test on a certain simple program for processing lists of length 7 over Integer. And Integer shows 2.55 times slower (11.2 sec against 4.4). Showld we somehow agree that cost(Integer)/cost(Int) in GHC is about 2.55 or maybe we are missing something? ----------------- Serge Mechveliani mechvel(a)botik.ru

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Re: Glasgow-haskell-users Digest, Vol 35, Issue 23
by p.tanski＠gmail.com 01 Aug '06

01 Aug '06

Brian, The standard method of skirting the LGPL restriction and saving your source code is to link dynamically in a separate step and then distribute your program along with the dynamically linked LGPL'd library. Compile with ghc -c (or with ghc -c -odir 'separate directory where you want to store the object files') and pass specific lines to the linker through gcc with -optc. Then link the object files for your program separately using ld and distribute the ghc runtime libraries you need to dynamically link along with your program. Some of these runtime libraries are big but on average libHSrts_dyn, libHSbase_dyn and libHSbase_cbits_dyn do the trick (I have needed cbits up for programs that use -ffi). Bulgat, Yes, GMP allows the fastest implementation but the problem I posed with GHC concerned "native" Integers, meaning that the actual implementation of Integer would be internal to the language implementation--i.e., not written in Haskell. I guess--I don't know GHC's internals apart from reading papers, such as "Haskell on a Shared-Memory Multiprocessor"--the memory problem would involve adding "carry" tag to chain thunks and allow lazy arbitrary precision arithmetic without resorting to program-level constructs like lists or big arrays. My point concerning other functional languages (OCaml and ML through MLton) was that gmp (or gmp-style) programs seem to be a common way of implementing the representation. Evolution means getting beyond that: is there another possibility? Esa, > I think the idea is to get rid of annoying dependencies (GMP), and not to > create new ones (C++). There's few other big ifs with APREC as far as I > see: Fiddling with FPU precision regs in x86 and possibly problems in > Windows environment. It might require a bit fiddling to get memory > handling right when using APREC, as well. Right on. I like ARPREC for some programs; it is easy and fast but I can imagine encountering problems when building it on Windows. ARPREC also keeps its own internal memory representation: to use it from c you essentially have to pass the numbers to its own runtime system (i.e., you have to initialise ARPREC and allocate memory for a variable using c_mpnew() before you can use it). It was just a suggestion to think about... -Peter On 7/30/06, glasgow-haskell-users-request(a)haskell.org <glasgow-haskell-users-request(a)haskell.org> wrote: > Send Glasgow-haskell-users mailing list submissions to > glasgow-haskell-users(a)haskell.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > or, via email, send a message with subject or body 'help' to > glasgow-haskell-users-request(a)haskell.org > > You can reach the person managing the list at > glasgow-haskell-users-owner(a)haskell.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Glasgow-haskell-users digest..." > > > Today's Topics: > > 1. Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL (Seth Kurtzberg) > 2. (Repost) Replacement for GMP as Bignum: ARPREC? Haskell?; OS > X and OpenSSL (p.tanski(a)gmail.com) > 3. Re: Re: Rebuilding GHC on Mac OSX PPC (p.tanski(a)gmail.com) > 4. Re: (Repost) Replacement for GMP as Bignum: ARPREC? Haskell?; > OS X and OpenSSL (Bulat Ziganshin) > 5. Re: (Repost) Replacement for GMP as Bignum: ARPREC? Haskell?; > OS X and OpenSSL (Esa Ilari Vuokko) > 6. Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL (Brian Hulley) > 7. Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL (Esa Ilari Vuokko) > 8. Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL (Duncan Coutts) > 9. Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL (Brian Hulley) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 29 Jul 2006 22:09:45 -0400 > From: Seth Kurtzberg <seth(a)cql.com> > Subject: Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL > To: p.tanski(a)gmail.com > Cc: glasgow-haskell-users(a)haskell.org > Message-ID: <20060729220945.92f3f263.seth(a)cql.com> > Content-Type: text/plain; charset=US-ASCII > > On Sat, 29 Jul 2006 21:45:21 -0400 > p.tanski(a)gmail.com wrote: > > > GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum library, BN. > > I have two questions concerning this: > > > > (1) Why not use the ARbitrary PRECision Computation Package (ARPREC) > > by David Bailey, Yozo Hida, Karthik Jeyabalan, Xiaoye Li and Brandon > > Thompson? Here is a reference web page: > > http://crd.lbl.gov/~dhbailey/mpdist/ > > > > ARPREC is written in C++ but supports calls from C (see > > include/arprec/c_mp.h in the distribution directory). ARPREC is very > > fast and supports more complex mathematics than BN. The Licensing for > > ARPREC is not a problem: essentially similar to BSD3. > > > > Note that there would be a basic configuration fix for building > > OpenSSL's BN library on OS 10.4: you would probably--I had to, > > myself--have to temporarily move the default installation of > > /usr/lib/libssl0.9.dylib (and variants) if you want to create a shared > > (.a) library because Apple's ln links dynamic libraries in preference > > to shared libraries. > > I think you meant "if you want to create a static (.a) library", not "if you want to create a shared (.a) library" > > Those of you who have some experience with > > Apple's gcc also know that Apple's gcc does not recognise the -shared > > flag. > > > > (2) A much more aesthetic solution would be to replace any external > > Bignum library with a pure Haskell library. There are many problems > > with building a truly efficient and fast Bignum library in Haskell but > > challenges like that are how languages evolve... > > > > -Peter Tanski > > _______________________________________________ > > Glasgow-haskell-users mailing list > > Glasgow-haskell-users(a)haskell.org > > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > > > > > ------------------------------ > > Message: 2 > Date: Sat, 29 Jul 2006 23:21:07 -0400 > From: p.tanski(a)gmail.com > Subject: (Repost) Replacement for GMP as Bignum: ARPREC? Haskell?; OS > X and OpenSSL > To: glasgow-haskell-users(a)haskell.org > Message-ID: > <f501497f0607292021w43160d44t3b4dc11a0478cdf7(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > (Sorry for the repost: I needed to correct a few typos--thanks > Seth--and clarify a few things.) > > GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum library, BN. > I have two questions concerning this: > > (1) Why not use the ARbitrary PRECision Computation Package (ARPREC) > by David Bailey, Yozo Hida, Karthik Jeyabalan, Xiaoye Li and Brandon > Thompson? Here is a reference web page: > http://crd.lbl.gov/~dhbailey/mpdist/ > > ARPREC is written in C++ but supports calls from C (see > include/arprec/c_mp.h in the distribution directory). ARPREC is very > fast and supports more complex mathematics than BN. The Licensing for > ARPREC is not a problem: essentially similar to BSD3. > > Note that there would be a basic configuration fix for building > OpenSSL's BN library on OS 10.4: you would probably--I had to, > myself--have to temporarily move the default installation of > /usr/lib/libssl0.9.dylib (and variants) if you want to create a static > (.a) library because Apple's ln links dynamic libraries in preference > to static libraries. > > (2) A much more aesthetic solution would be to replace any external > Bignum library with a pure Haskell library. There are many problems > with building a truly efficient and fast Bignum library in Haskell but > challenges like that are how languages evolve... Both GHC and nhc98 > seem to use GMP, OCaml uses a custom bignum library written by Xavier > Leroy and even MLton uses GMP. Robert Dockins wrote a type-based > library for arbitrary that can (slowly) handle big numbers (up to > 10^15), see http://www.eecs.tufts.edu/~rdocki01/typenats.html I don't > know what the constraints on making such native Integer support work > in GHC but my comment on the evolution of Haskell was not meant badly: > native Integer support would require modifications to how Integers are > handled in memory. (I would be glad to lend whatever support I could > on this, but it seems like a big project.) > > -Peter Tanski > > > ------------------------------ > > Message: 3 > Date: Sun, 30 Jul 2006 00:29:43 -0400 > From: p.tanski(a)gmail.com > Subject: Re: Re: Rebuilding GHC on Mac OSX PPC > To: glasgow-haskell-users(a)haskell.org > Message-ID: > <f501497f0607292129m2387ebbejbb3f9540fc3841d2(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Sorry to flood your mailboxes with my junk, but I had a few questions > on the configuration and Makefiles for building GHC on OS 10.4: > > The odd memory bugs (wierd malloc errors) seem to remind me of errors > using pthreads... > > in Joel Reymont's email, I noticed that ghc is given the -threaded option: > > ../../ghc/compiler/stage1/ghc-inplace -o stage2/ghc-6.4.3 ... > ... -threaded -package readline -DUSE_READLINE - > > I have not had any luck using -threaded with GHC on my own programs, > but I do not know what options GHC passes to gcc with -threaded. If > GHC -threaded means it passes gcc > the -pthread option when compiling -fvia-C, the problem might be that > Apple's gcc does not recognize the -pthread flag (you have to link > -lpthread manually, preferably after the object files). > > If I can get the configuration correct--or whatever parameters you > think you might want--I will get a clean distribution and try to build > ghc-6.4.3 tomorrow (I am using a 1.25 MHz PPC). > > -Peter Tanski > > > ------------------------------ > > Message: 4 > Date: Sun, 30 Jul 2006 10:35:20 +0400 > From: Bulat Ziganshin <bulat.ziganshin(a)gmail.com> > Subject: Re: (Repost) Replacement for GMP as Bignum: ARPREC? Haskell?; > OS X and OpenSSL > To: p.tanski(a)gmail.com > Cc: glasgow-haskell-users(a)haskell.org > Message-ID: <664568392.20060730103520(a)gmail.com> > Content-Type: text/plain; charset=us-ascii > > Hello p, > > Sunday, July 30, 2006, 7:21:07 AM, you wrote: > > > Leroy and even MLton uses GMP. Robert Dockins wrote a type-based > > library for arbitrary that can (slowly) handle big numbers (up to > > 10^15), see http://www.eecs.tufts.edu/~rdocki01/typenats.html I don't > > this don't have anything common with our problem of implementing > efficient runtime library > > > know what the constraints on making such native Integer support work > > in GHC but my comment on the evolution of Haskell was not meant badly: > > native Integer support would require modifications to how Integers are > > handled in memory. (I would be glad to lend whatever support I could > > on this, but it seems like a big project.) > > imho, you are wrong. current representation allows fastest operations. > but anyway Haskell code will be several times slower than C one - even > for GHC, much more for Haskell interpreters > > > -- > Best regards, > Bulat mailto:Bulat.Ziganshin@gmail.com > > > > ------------------------------ > > Message: 5 > Date: Sun, 30 Jul 2006 13:00:24 +0300 > From: "Esa Ilari Vuokko" <eivuokko(a)gmail.com> > Subject: Re: (Repost) Replacement for GMP as Bignum: ARPREC? Haskell?; > OS X and OpenSSL > To: "p.tanski(a)gmail.com" <p.tanski(a)gmail.com> > Cc: glasgow-haskell-users(a)haskell.org > Message-ID: > <cd4c8b540607300300m7dbd4359q1aea51d723500cf0(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi > > On 7/30/06, p.tanski(a)gmail.com <p.tanski(a)gmail.com> wrote: > > (Sorry for the repost: I needed to correct a few typos--thanks > > Seth--and clarify a few things.) > > > > GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum library, BN. > > I have two questions concerning this: > > > > (1) Why not use the ARbitrary PRECision Computation Package (ARPREC) > > by David Bailey, Yozo Hida, Karthik Jeyabalan, Xiaoye Li and Brandon > > Thompson? Here is a reference web page: > > http://crd.lbl.gov/~dhbailey/mpdist/ > > > > ARPREC is written in C++ but supports calls from C (see > > include/arprec/c_mp.h in the distribution directory). ARPREC is very > > fast and supports more complex mathematics than BN. The Licensing for > > ARPREC is not a problem: essentially similar to BSD3. > > I think the idea is to get rid of annoying dependencies (GMP), and not to > create new ones (C++). There's few other big ifs with APREC as far as I > see: Fiddling with FPU precision regs in x86 and possibly problems in > Windows environment. It might require a bit fiddling to get memory > handling right when using APREC, as well. > > In past, I tried to get rid of GMP by replacing it with libtommath > http://math.libtomcrypt.com/ > But I have given up for now - because of related and unrelated problems. > > But, whoever starts the work probably gets to pick their lib, so OpenSSL's > BN, APREC, LibTomMath or anything else...it's open :-) > > Best regards, > Esa > > > ------------------------------ > > Message: 6 > Date: Sun, 30 Jul 2006 11:53:30 +0100 > From: "Brian Hulley" <brianh(a)metamilk.com> > Subject: Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL > To: <p.tanski(a)gmail.com>, <glasgow-haskell-users(a)haskell.org> > Message-ID: <002801c6b3c7$5cab93d0$c8ec2950@osmet> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=response > > p.tanski(a)gmail.com wrote: > > GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum > > library, BN. I have two questions concerning this: > > >From the ticket, this looks very scary: > > but its LGPL license is problematic for users of GHC > (it prohibits static linking of GHC-compiled programs, for > example). > > Does this mean I can't distribute my Haskell app as a commercial > application? I certainly don't want to distribute source code and I've got > no idea how to compile a Haskell app other than using ghc --make, which > creates a single exe ie with static linkage. > > If I only use Int's (not Integer's) in my code, is there a way to get rid of > GMP so that I won't have an impossible licencing problem when trying to > distribute my application binary? If not, then it would seem absolutely > vital to get rid of GMP as soon as possible or else try to persuade the > authors to add the usual static linking exception to their LGPL licence for > it. > > Thanks, Brian. > > -- > Logic empowers us and Love gives us purpose. > Yet still phantoms restless for eras long past, > congealed in the present in unthought forms, > strive mightily unseen to destroy us. > > http://www.metamilk.com > > > > ------------------------------ > > Message: 7 > Date: Sun, 30 Jul 2006 14:18:30 +0300 > From: "Esa Ilari Vuokko" <eivuokko(a)gmail.com> > Subject: Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL > To: "Brian Hulley" <brianh(a)metamilk.com> > Cc: p.tanski(a)gmail.com, glasgow-haskell-users(a)haskell.org > Message-ID: > <cd4c8b540607300418s744b3972w4cf3230083e8ac77(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 7/30/06, Brian Hulley <brianh(a)metamilk.com> wrote: > > p.tanski(a)gmail.com wrote: > > > GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum > > > library, BN. I have two questions concerning this: > > > > >From the ticket, this looks very scary: > > > > but its LGPL license is problematic for users of GHC > > (it prohibits static linking of GHC-compiled programs, for > > example). > > > > Does this mean I can't distribute my Haskell app as a commercial > > application? I certainly don't want to distribute source code and I've got > > I am not a lawyer, and you should consult lawyer if you want real > advice about licensing issues. > > Strict answer to first question: No. You can distribute statically compiled > binaries. > > > no idea how to compile a Haskell app other than using ghc --make, which > > creates a single exe ie with static linkage. > > But in this case, yes, you can't. You need to provide way to > relink gmp in you program. As far as I know, this is simply possible > by taking all the objs --make generates, other objs and libs and giving > them on - users need to have ghc distro+their own gmp set in. > > > If I only use Int's (not Integer's) in my code, is there a way to get rid of > > GMP so that I won't have an impossible licencing problem when trying to > > I am fairly certain you cannot force or rely GMP getting dropped by > linker. > > > distribute my application binary? If not, then it would seem absolutely > > vital to get rid of GMP as soon as possible or else try to persuade the > > authors to add the usual static linking exception to their LGPL licence for > > it. > > GMP being rather GNU ;-) replacing is probably the only option. > > There's other reason for dropping GMP as well: The ghc rts steals GMP > memory allocation (sort of integrating it with garbage collector) which > makes it impossible for other parts of program use GMP (in practice). > > HTH, > --Esa > > > ------------------------------ > > Message: 8 > Date: Sun, 30 Jul 2006 12:58:09 +0100 > From: Duncan Coutts <duncan.coutts(a)worc.ox.ac.uk> > Subject: Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL > To: Brian Hulley <brianh(a)metamilk.com> > Cc: p.tanski(a)gmail.com, glasgow-haskell-users(a)haskell.org > Message-ID: <1154260689.14437.26.camel@localhost> > Content-Type: text/plain > > On Sun, 2006-07-30 at 11:53 +0100, Brian Hulley wrote: > > p.tanski(a)gmail.com wrote: > > > GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum > > > library, BN. I have two questions concerning this: > > > > >From the ticket, this looks very scary: > > > > but its LGPL license is problematic for users of GHC > > (it prohibits static linking of GHC-compiled programs, for > > example). > > > > Does this mean I can't distribute my Haskell app as a commercial > > application? I certainly don't want to distribute source code and I've got > > no idea how to compile a Haskell app other than using ghc --make, which > > creates a single exe ie with static linkage. > > GHC only statically links Haskell code. It dynamically links to GMP and > the system C library and other C libs. > > So you're fine. > > On unix you can check for yourself with ldd. It lists all the shared > libs that your program needs. For example: > > $ ldd /usr/lib/ghc-6.4.2/ghc-6.4.2 > libreadline.so.5 => /lib/libreadline.so.5 (0x00002b568fca6000) > libncurses.so.5 => /lib/libncurses.so.5 (0x00002b568fde3000) > libdl.so.2 => /lib/libdl.so.2 (0x00002b568ff3f000) > libm.so.6 => /lib/libm.so.6 (0x00002b5690042000) > libgmp.so.3 => /usr/lib/libgmp.so.3 (0x00002b569019a000) > libpthread.so.0 => /lib/libpthread.so.0 (0x00002b56902cf000) > libc.so.6 => /lib/libc.so.6 (0x00002b56903e4000) > /lib64/ld-linux-x86-64.so.2 (0x00002b568fb8e000) > > Duncan > > > > ------------------------------ > > Message: 9 > Date: Sun, 30 Jul 2006 13:21:12 +0100 > From: "Brian Hulley" <brianh(a)metamilk.com> > Subject: Re: Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and > OpenSSL > To: "Esa Ilari Vuokko" <eivuokko(a)gmail.com> > Cc: glasgow-haskell-users(a)haskell.org > Message-ID: <003901c6b3d2$a6c01cb0$c8ec2950@osmet> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=response > > Esa Ilari Vuokko wrote: > > On 7/30/06, Brian Hulley <brianh(a)metamilk.com> wrote: > >> p.tanski(a)gmail.com wrote: > >>> GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum > >>> library, BN. I have two questions concerning this: > >> > >>> From the ticket, this looks very scary: > >> > >> but its LGPL license is problematic for users of GHC > >> (it prohibits static linking of GHC-compiled programs, for > >> example). > [snip] > > But in this case, yes, you can't. You need to provide way to > > relink gmp in you program. As far as I know, this is simply possible > > by taking all the objs --make generates, other objs and libs and > > giving them on - users need to have ghc distro+their own gmp set in. > > Hi Esa - > Thanks for reminding me about the distinction between source and object > files. I keep forgetting that object files exist (!) and that it's > sufficient for LGPL to just make them available. > > Still, a slight problem is that since there is one object file per source > file, the names of the object files give quite a lot of information away > about the structure of the program especially when they are arranged in a > module hierarchy, so I'll be glad when GMP is replaced by something without > such a burdensome licence. (Although perhaps I can bundle my object files > into a single library file but I don't know how to do this yet, or if it > would really help in the goal to make the code completely obfuscated, > impenetrable, and unavailable to any rival company... ;-) ) > > Thanks again, > Brian. > -- > Logic empowers us and Love gives us purpose. > Yet still phantoms restless for eras long past, > congealed in the present in unthought forms, > strive mightily unseen to destroy us. > > http://www.metamilk.com > > > > ------------------------------ > > _______________________________________________ > Glasgow-haskell-users mailing list > Glasgow-haskell-users(a)haskell.org > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > > > End of Glasgow-haskell-users Digest, Vol 35, Issue 23 > ***************************************************** >

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Rebuilding GHC on Mac OSX PPC
by Joel Reymont 01 Aug '06

01 Aug '06

Simon, Did you say I need to check out the version from CVS and build that? I tried building crypto with the darwinports version and it went fine. I did not see -threaded passed to stage2 builds, though. Thanks, Joel -- http://wagerlabs.com/

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--show-iface grammar?
by David House 01 Aug '06

01 Aug '06

Hi list. Is there a document anywhere describing the grammar of the --show-iface output? Should there be one? This seems like a fairly complicated output, and parsing it could be very useful for tools that, e.g., need to know the strictness of various functions. Thanks in advance. -- -David House, dmhouse(a)gmail.com

3 2

cost of Integer
by Serge D. Mechveliani 31 Jul '06

31 Jul '06

By my previous letter about cost(Integer)/cost(Int) = 2.55 I wanted to ask is there anything new in ghc-6.4.1 in comparison to, say, ghc-5.01, to ghc-4, with relation to this cost ratio? Regards, ----------------- Serge Mechveliani mechvel(a)botik.ru

1 0

Replacement for GMP as Bignum: ARPREC? Haskell?; OS-X and OpenSSL
by p.tanski＠gmail.com 30 Jul '06

30 Jul '06

GHC Task Ticket # 601 suggests replacing GMP with OpenSSL's Bignum library, BN. I have two questions concerning this: (1) Why not use the ARbitrary PRECision Computation Package (ARPREC) by David Bailey, Yozo Hida, Karthik Jeyabalan, Xiaoye Li and Brandon Thompson? Here is a reference web page: http://crd.lbl.gov/~dhbailey/mpdist/ ARPREC is written in C++ but supports calls from C (see include/arprec/c_mp.h in the distribution directory). ARPREC is very fast and supports more complex mathematics than BN. The Licensing for ARPREC is not a problem: essentially similar to BSD3. Note that there would be a basic configuration fix for building OpenSSL's BN library on OS 10.4: you would probably--I had to, myself--have to temporarily move the default installation of /usr/lib/libssl0.9.dylib (and variants) if you want to create a shared (.a) library because Apple's ln links dynamic libraries in preference to shared libraries. Those of you who have some experience with Apple's gcc also know that Apple's gcc does not recognise the -shared flag. (2) A much more aesthetic solution would be to replace any external Bignum library with a pure Haskell library. There are many problems with building a truly efficient and fast Bignum library in Haskell but challenges like that are how languages evolve... -Peter Tanski

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