> "Simon Marlow" <[EMAIL PROTECTED]> writes:
>
> > GHC actually has rather sophisticated recompilation checking which
> > goes beyond just checking whether the interface changed - it keeps
> > version information for each entity exported by a module and only
> > recompiles if any of the entities actually used by the module have
> > changed (this is described in the user's guide under the section on
> > recompilation checking).
>
> I've seen unexpected compiles using ghc --make. I've got a system
> with modules A, B, and C; A depends on B and B depends on C. I've
> seen the following sequence of events:
>
> I change C
> ghc --make A compiles C, B, and A
> I change A
> ghc --make A skips C and compiles B and A
>
> I don't know of any reason why it would have compiled B in the second
> case.
>
> If this is not a known bug, I can try to reproduce it and submit a
> formal bug report.
It's not a known bug, although we have encountered problems of this kind in the past.
Thanks for the report, we'll look into it.
Cheers,
Simon
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