Am Donnerstag, 8. Januar 2004 17:39 schrieb Simon Marlow:

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$ ghc -E -cpp -D__HADDOCK__ Foo.hs -o Foo.raw-hs

This only replaces all __HADDOCK__ occurences with 1 but doesn't process #ifdefs.

Are you sure? It works for me, and it's what we use in GHC's libraries.

I found the problem, meanwhile. You have to put the #ifdefs etc. at the beginning of the line. Uuh—terrible, I'd say. The same holds for cpp -traditional. cpp without -traditional is more tolerant but treats everything beginning with // as a comment and is therefore not usable with Hugs when you need Data.Array. Generally, I'd say that using a C preprocessor for Haskell is a bad idea but, of course, I can imagine that it requires less work to make cpp usable for Haskell than to develop a new preprocessor from scratch. But is using cpp planned to be a long-term solution?

Cheers, Simon

Wolfgang