state of the cabal (preprocessors)

Isaac Jones ijones at
Tue Oct 26 17:33:41 EDT 2004

"Simon Marlow" <simonmar at> writes:

> 3. We add CPP to the list of extensions in Cabal, so you can say {-#
> LANGUAGE CPP #-} to get C preprocessing in the current file, or add CPP
> to the list of extensions in the package description to get CPP on every
> file.  That doesn't preclude also using a .cpp extension, but it means
> you don't have to.

For hugs this would mean preprocessing all files and putting the new
.hs files into a temp directory and compiling these.  Hopefully, there
will be directives in the preprocessed sources to refer back to the
original source, and hugs should report errors against the original
source lines rather than the preprocessed source lines.  Is hugs able
to do this already?

For GHC and NHC, this just means we use the -cpp flag.

Is this correct?  If so, that's fine by me (and I speak for the cabal
;) )



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