[Haskell-beginners] exceptions and stacks

Emmanuel Touzery etouzery at gmail.com
Tue Nov 6 22:37:48 CET 2012

so in the end I had to build the program with:

 ghc -prof -auto-all -rtsopts -osuf prof *.hs

so also -rtsopts. After the simple ghc *.hs build.

then I run it with:

+RTS -xc -RTS

in the command-line.

but it doesn't appear to work properly, I guess I didn't quite compile or
run it correctly. It constantly displays me some stack position during the
whole runtime even when there is no problem.
When the real problem comes, it still displays the same stack it did for
the whole runtime, but there is no "head" in that function.

I'll probably end up debugging this one "by hand", but I would really would
like to have a general solution for the problem for the future, where
tooling would help me...

annotating/modifying my code... it really seems wrong in this case :-/

On Tue, Nov 6, 2012 at 8:34 PM, Emmanuel Touzery <etouzery at gmail.com> wrote:

> well it certainly requires will to build with profiling.
> i had to reinstall all my cabal packages with profiling enabled, which i
> finally managed to do now..
> and now it tells me:
> ghc -prof -auto-all Prog.hs
>     Dynamic linking required, but this is a non-standard build (eg. prof).
>     You need to build the program twice: once the normal way, and then
>     in the desired way using -osuf to set the object file suffix.
> Ah well.. I'll fight some more with this later. Not exactly "out of the
> box"...
> Emmanuel
> On Tue, Nov 6, 2012 at 1:02 PM, Ozgur Akgun <ozgurakgun at gmail.com> wrote:
>> Hi Emmanuel,
>> It is indeed good practice to write total programs in general. However, I
>> understand the need for stack traces in practice.
>> There are some slides by Simon Marlow on the issue, ironically using your
>> example in the title.
>> In short: check the -xc flag in
>> http://www.haskell.org/ghc/docs/7.0.1/html/users_guide/runtime-control.html
>> Hope this helps,
>> Ozgur
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