31 Oct
2005
31 Oct
'05
4:02 a.m.
Neil Mitchell
None are terribly attractive (and they would only be for cpp).
I agree. Is there no other way to stop the preprocessor running on all files, and restricting it to just those which are needed?
There was talk at one stage of a standard language-extensions pragma, corresponding to your third option. {-# LANGUAGE cpp MPTC fundeps #-} I think SimonM has just implemented it for ghc, the rest of us are lagging behind. FWIW, hmake uses both of your first two suggestions - detect a # in the first column, and also permit a filename extension to trigger cpp. The latter doesn't seem too awful, since other preprocessors use the same method (Happy .y, Alex .x, hsc2hs .hsc, etc). Regards, Malcolm