SevenThunders wrote:
The new behavior is that under certain conditions a certain matrix inner
product produces undefined floats, that should not be there.
I now have a simple example that I have posted as ticket number 1944 for ghc
6.8.1. The behavior is that if I link
Ian Lynagh wrote:
Can any of you give us a testcase for this, please?
Thanks
Ian
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I started to work on this but so far
Simon Peyton-Jones wrote:
Alberto, SevenThunders, Joel,
Glark. This is not good. Thank you for being so polite about it. And
thanks for working on a reproducible test case -- without that we are 100%
stuck.
We did fix one just-possibly-related bug in 6.8 recently, which concerned
Alberto Ruiz-2 wrote:
Hello,
I have had exactly the same problem with my bindings to GSL, BLAS and
LAPACK.
The foreign functions (!) randomly (but very frequently) produced NaN with
ghc-6.8.1 -O. As usual, I first thought that I had a subtle bug related to
the foreign pointers, but
Alberto Ruiz-2 wrote:
Hmm, I' sorry... all seems to work well for me if I set -O -fvia-C for
building the library and for final program compilation. But I will also
try
to find a minimum test case. In the meantime I have sent to Ian
information
to expose the problem with my
The good news is that my code compiles without error and much faster under
ghc 6.8.1.
The bad news is that there appear to be subtle bugs that did not occur when
I compiled things under
6.6.1. One issue is that my code is somewhat complex and links into a C
library as well.
The new behavior is
Paul Johnson-2 wrote:
SevenThunders wrote:
Unfortunately if I wrap my matrix references in the IO monad, then at
best
computations like
S = A + B are themselves IO computations and thus whenever they are
'invoked' the computation ends up getting performed repeatedly contrary
to
my
Dominic Steinitz wrote:
If you arrange the types to try to do all the operations inside the IO
monad you can't chain together more than 1 binary operation. eg.
do
S - A + B
Z - Q * S
vs
do
S - Q * (A + B)
Are there any suggestions for this dilemma? Am I using
I have a matrix library written in C and interfaced into Haskell with a lot
of additional Haskell
support. The C library of course has a lot of side effects and actually
ties into the BLAS libraries, thus at the present time, most of the
interesting calls are done in the IO monad. I have no
Ryan Ingram wrote:
As long as the FFI calls don't make destructive updates to existing
matrices, you can do what you want.
For example, assuming you have:
-- adds the second matrix to the first overwrites the first
matrixAddIO :: MatrixIO - MatrixIO - IO ()
-- creates a new copy
Did I find a bug cabal?
I have attempted to fix the problem
Main.c:(.text+0x22): undefined reference to `__stginit_ZCMain'
by compiling my Haskell library using the flag -no-hs-main. One would think
that this would make sense if the library is to be used by an external C
program. However I
SevenThunders wrote:
I have a large Haskell/C project that needs to be linked against an even
larger set of C libraries and object files (OpNet) on a linux box (Fedora
Core 7). So far I have been able to link my Haskell libraries to some C
test code containing a main function without
I have a large Haskell/C project that needs to be linked against an even
larger set of C libraries and object files (OpNet) on a linux box (Fedora
Core 7). So far I have been able to link my Haskell libraries to some C
test code containing a main function without incident. However the link
Bulat Ziganshin-2 wrote:
Hello SevenThunders,
Saturday, June 30, 2007, 7:45:57 AM, you wrote:
My own code is half Haskell and half C. My build process is rather
complex
i have the same. initially C code was compiled by gcc but finally i
switched to ghc-only compilation. it's also
I have a very complex project that has to play nice with a lot of C code
written by other people.
My own code is half Haskell and half C. My build process is rather complex
since I generate about 5 different libraries, some of them export Haskell
routines. A supreme effort was made to try to
SevenThunders wrote:
perhaps what's contained in foo.hi that informs ghc what names to actually
link to.
I'm not so sure if this is correct or not. The truth is I have no .hi files
in the directory I try to link my test code, and yet it's somehow finding
them in the cabal created
I discovered a curious thing after a compiling a medium sized Haskell project
using
the 64 bit linux Haskell GHC 6.6.1 compiler. Several of the generated
object files (.o) show up
as containing the virus Downloader.Obfuskated by my AVG anti-virus program
when viewing
the files from windows xp
Is there a simple way to detect what operating system a given Haskell program
is running under?
It would help to make some programs that might have to interact with the
operating system more portable.
I haven't been able to quite figure out a simple way to do this.
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Brandon S. Allbery KF8NH wrote:
On May 5, 2007, at 0:21 , SevenThunders wrote:
Is there a simple way to detect what operating system a given
Haskell program
is running under?
mress:5002 Z$ ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC
Duncan Coutts wrote:
So it's easy if you link the system using ghc. If you want to link it
all using gcc instead, yeah, that's a bit harder. You can see most of
the flags ghc passes to gcc as they're just in the package configuration
for the rts and base packages (ghc-pkg display rts /
jasonm wrote:
While we're on the topic, does anyone know if there exists a similarly
simple solution like the (last) section Using both Python Haskell
with ctypes at
http://wiki.python.org/moin/PythonVsHaskell
that works on Linux to easily link Haskell libraries/functions into
Python?
Dan Weston wrote:
In the GHC docs:
http://www.haskell.org/ghc/docs/6.4.1/html/users_guide/sec-ffi-ghc.html#using-own-main
There can be multiple calls to hs_init(), but each one should be
matched by one (and only one) call to hs_exit()[8].
What exactly happens with nested calls? Is
I've finished a good sized Haskell project which I now must expose as a
library (along with a lot of C code) to my fellow engineers. I had
originally devoped my code on Windows XP and managed to learn how to wrap my
Haskell code in a DLL and create an MSVC linkable library stub for the DLL.
Simon Marlow wrote:
Tom Hawkins wrote:
I have a chunk of Haskell code I would like wrap up and distribute as
a library. Is there a way to build a static library (*.a) that
includes my code plus the Haskell runtime, which C programs can easily
link against? Here is what I have tried so
, namely -fglasgow-exts.
Cheers,
Spencer Janssen
On Tue, 13 Mar 2007 22:20:20 -0700 (PDT)
SevenThunders [EMAIL PROTECTED] wrote:
I have the pleasure of porting a good sized Haskell application to
linux. So far the Haskell code has compiled without incident, however
some code that I
I have the pleasure of porting a good sized Haskell application to linux.
So far the Haskell code has compiled without incident, however some code
that I hacked
to implement a Read instance for Unboxed Arrays does not compile on linux
even though it compiles just fine on Windows XP in Haskell
Brian Hulley wrote:
Since Begin would be a function exported by the DLL, Windows would ensure
that the DLL was loaded when it is first called from your application if
it
was not already loaded so there would be no need for an explicit call to
LoadLibrary.
and then End
Neil Mitchell wrote:
The problem is that something like GHC is very complex, with lots of
transformations. When transformations are firing other
transformations, which in turn fire other transformations, it doesn't
take a great deal to disrupt this flow of optimisation and end up with
a
Neil Mitchell wrote:
I found that Read was maybe 30 times slower than the slowest binary
serialisation method I could possibly think of. If performance matters
to you, and the array is more than a few elements long, switching away
from Read/Show should be the first step - before going
Donald Bruce Stewart wrote:
mattcbro:
Faster, and trivial to write! Here's a complete example:
...
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Thanks for the example.
Simon Peyton-Jones wrote:
Dear SevenThunders (if that is how you like to addressed)
Thanks for extracting a small program that exhibits the leak; that is
really helpful. We'll look into it. Would you like to create a Trac bug
and attach your files?
Simon
You can call me
I'm not sure if this is a bug, but it sure seems that way to me. When using
the wrapper technique for creating a Haskell callback function it seems
that freeHaskellFunPtr is not properly freeing the resource.
Here is an example program
leaky.hs
module Main where
import Foreign
import
SevenThunders wrote:
All my code is compiled using the -prof -auto
flag and then run using +RTS -hc -RTS. The resulting plots do not show
a linear increase in heap usage, although the Windows XP operating
system does report such an increase.
This is either a bug in GHC or a bug
Jason Dagit-2 wrote:
Do any memory leaks show up if you compile with -caf-all when you profile?
Jason
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It doesn't seem to
Michael Marte wrote:
I am still using ghc 6.4.2 for creating my DLL and, as long as the DLL
does not open a file, releasing the DLL works fine. I have not yet tried
ghc 6.5.
Michael
I just tried it under GHC 6.6 with the same results. If the DLL is loaded it
crashes when it's
SevenThunders wrote:
I just tried it under GHC 6.6 with the same results. If the DLL is loaded
it crashes when it's unloaded even if no Haskell code is actually
executed.
Here is the promised simple example. This example will cause an exception
when the DLL is unloaded
Ivan Perez-4 wrote:
Matthew Bromberg wrote:
I can't help you about the haddock thing but, in my experience,
if you forgive that kind of mistakes, many users will write
documentation with
lots of warnings and say ok, these docs ain't right but, it works for
me.
I guess this is mostly
SevenThunders wrote:
-- | compute cos (theta / 2) assuming the branch [-pi, pi]
halfcos :: Double - Double
halfcos cs = sqrt $ (cs + 1)/2
This produces a parse error
parse error in doc string: [haddock.exe: reading EOF!
on the h of the
halfcos :: Double - Double
line
David House wrote:
On 06/10/06, SevenThunders [EMAIL PROTECTED] wrote:
Some of these functions are really annoying to write type declarations
for.
Maybe I'll get ghci to do it for me and use cut and paste :)
Try using type synonyms to bring the beasts to order.
--
-David House
SevenThunders wrote:
I am having some difficulty with creating a dynamic link library using
GHC on windows XP.
I am having some problems with GHCs stdout when a Haskell program is called
from a windows program.
As I noted earlier I am calling some Haskell code from C as a bridge
Well I tried this statement
ghc --mk-dll -fglasgow-exts -fffi -I. --make ExternLib.hs
It only compiled the object file, creating ExternLib.o, but it did not
create the stub file or attempt to link in the dependent packages. I then
went back to this,
ghc --mk-dll -fglasgow-exts -fffi -o
Jason Dagit wrote:
On 9/27/06, SevenThunders [EMAIL PROTECTED] wrote:
Does cabal really work on windows?
I've never had a problem with cabal on windows. I use it instead of
makefiles and I'm reasonably happy with it.
Although it's installed I notice that
when I try to build my
SevenThunders wrote:
I am having some difficulty with creating a dynamic link library using
GHC on windows XP.
I am attempting to follow the example in
http://www.haskell.org/ghc/docs/6.4/html/users_guide/win32-dlls.html
though I have a binary build of ghc 6.5
My problem (I think
SevenThunders wrote:
I am having some difficulty with creating a dynamic link library using
GHC on windows XP.
I need to report some additional strange DLL behavior with ghc.exe
unfortunately.
Although I solved my linking problems and was able to create a .dll and a MS
VC .lib file
SevenThunders wrote:
SevenThunders wrote:
I am having some difficulty with creating a dynamic link library using
GHC on windows XP.
I need to report some additional strange DLL behavior with ghc.exe
unfortunately.
Although I solved my linking problems and was able
Yes I do have another test on my path. It is in a utilities directory of
unix like commands that have been ported to windows. However I also have a
test.exe that was created by ghc that seems to do nothing, even if I type
./test.exe. Thanks for the hint though.
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Florian Weimer wrote:
* SevenThunders:
OK it was stupid. Apparently GHC behaves differently according to what
the
name of the high level source file is. If I renamed test.hc to main.hc
everything works the same as GHCi. I probably should actually read the
manual some day.
Some
Sebastian Sylvan-2 wrote:
Well, why would you want a huge array of random numbers?
In Haskell there are two big ways to gain efficiency, strictness and
laziness. In this case I think laziness is a big candidate (the huge
array part gives it away).
Also there is no reason generating
Bulat Ziganshin-2 wrote:
Hello Matthew,
Sunday, July 23, 2006, 10:35:41 AM, you wrote:
sequence $ [ reffill b s | s - [0..(fi temits)-1], b - [0..(fi
nc)-1]]
Now thats interesting. I can see that this function is more appropriate
since I do not need to retrieve data from the
Alberto Ruiz-2 wrote:
The GSL has been ported to Windows:
http://gnuwin32.sourceforge.net/packages/gsl.htm
so I think that GSLHaskell could also be adapted to work in Windows... I
will
try to do it.
Alberto
On Monday 24 July 2006 02:56, SevenThunders wrote:
Jared Updike wrote
Bulat Ziganshin-2 wrote:
Hello Matthew,
Sunday, July 23, 2006, 10:35:41 AM, you wrote:
sequence $ [ reffill b s | s - [0..(fi temits)-1], b - [0..(fi
nc)-1]]
Now thats interesting. I can see that this function is more appropriate
since I do not need to retrieve data from the
Jared Updike wrote:
GSL Haskell bindings:
http://dis.um.es/~alberto/GSLHaskell/
http://dis.um.es/~alberto/GSLHaskell/doc/
Specifically for Linary Algebra:
http://dis.um.es/~alberto/GSLHaskell/doc/GSL-Base.html
You make a good point and the decision was by no means cut and dry.
Are there Haskell specific tools for Eclipse? My experience so far has been
somewhat negative.
I tried to use eclipse with D some time ago, but the plugin kept crashing
and Eclipse seems to
have kind of a mind of it's own. I think for java development it's highly
regarded.
Everytime I try one
Has anyone actually seen ghc link successfully to third party libraries on
windows?
While I have been able to link to C object code compiled by ghc (and thus
gcc by proxy), I have not been able to actually link against any substantial
third party library or dll in windows.
I am currently
Aarrgh! Are the formatting commands the same?
I don't want to have to rewrite the whole thing.
That is a bit confusing.
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Thats some good info. It probably should go on that wiki page.
All I need now is an unlimited amount of spare time...
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Thanks for the gnuplot stuff. I intend to try that out. Perhaps sooner than
later.
As for lhs2tex, since no windows installer is provided, it might be a bit
trickier and my time
is very limited. Also after reviewing the manual it seems to still be
focused on literate programming more than
I am new to Haskell and found myself in a bind concerning the use of
the C types, CDouble in particular. I extract a CDouble via it's pointer
from a StorableArray. Since the array must interface with C the elements of
the array must be CDouble. Now I'd like to use Text.Printf to format print
Thanks that helps a bit. The realToFrac type coercion works, but ultimately
it seems
that printf won't play nice. Consider this simple haskell code
module Test
where
import IO
-- import Data.Array.Storable
import Text.Printf
import Foreign.C.Types (CInt, CDouble )
y :: CDouble
y =
The rabbit hole goes a bit deeper I'm afraid
y :: CDouble
y = 5.2
u :: Double
u = realToFrac(y)
test = do printf %14.7g u
gives
Compiling Test ( test.hs, interpreted )
test.hs:14:11:
No instance for (PrintfType (t t1))
arising from use of `printf' at test.hs:14:11-16
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