[Haskell-cafe] ghc 6.8.1 bug?

SevenThunders mattcbro at earthlink.net
Thu Nov 15 13:58:26 EST 2007

Alberto Ruiz-2 wrote:
> Hello,
> I have had exactly the same problem with my bindings to GSL, BLAS and
> 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 after a lot of refactoring, experiments, and 
> tracing everything, I'm reasonably sure that memory is safely used. What I 
> have found is that the same errors can be reproduced on ghc-6.6.1 
> with -O -fasm. So I tried -O -fvia-C on ghc-6.8.1 (which now it is not the 
> default) and apparently everything works well. So it seems that now the
> ffi 
> requires and additional and explicit -fvia-C. In any case I don't know 
> why -fasm produces those strange NaN in precompiled foreign functions...
> Alberto
Arrgh, the fix of using -fvia-C doesn't seem to be working for me.
You got my hopes up for a moment :).
I also am calling BLAS via C bindings. 
I am going to try to distill my case down to the bare minimum if possible
and then provide an example. It may take a while.

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