ghci doesn't run FFi'd code which works under ghc on WinXP

Simon Marlow simonmarhaskell at
Thu Apr 5 05:23:58 EDT 2007

Vivian McPhail wrote:
> Hi All,
> I wrote a binding to matlab matrix.h and mat.h.  My test program works 
> when I compile a binary, but when I try to use the code in ghci nothing 
> happens.  There are no error messages, but all computations return a 
> blank line.
> Does this fall into a known class of error?
> I can provide my source code, but because of licensing requirements I 
> can't provide the .dll's against which the code is linked.

I can't think of a reason off-hand why this would happen.  Could you investigate 
deeper by adding traces into your code?  If you can boil down a small example 
that doesn't have licensing restrictions, please submit it as a bug report.


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