If cpp is troublesome, another workaround might be to persuade ghc to use cpphs, which at least is aware of Haskell syntax.
Regards,
Malcolm (iPhone)
On 1 Feb 2015, at 21:51, Brandon Allbery
With the new version of GHC (7.8.3) I am running into problems with cpp.
The header of one of the files of my uu-parsinglib library reads as follows:
{-# LANGUAGE NoMonomorphismRestriction, RankNTypes, FlexibleContexts, CPP #-} #define DEMO(p,i) demo "p" i p #define DEMOG(p,i) demo "p" i (mkP (p)) module Text.ParserCombinators.UU.Demo.MergeAndPermute where
...
However when I try to compile this file I get error messages like:
Text/ParserCombinators/UU/Demo/Demo.hs:88:17: Not in scope: data constructor ‘DEMOG’
(1) ghc is at 7.8.4. I *think* 7.8.4 does slightly better here, but only slightly: (2) May I guess that Demo.hs line 88 starts with an identifier with a prime in it? GHC 7.8.3 on OS X tries to make clang's cpp behave like gcc's, but does not completely succeed; clang's cpp will ignore macros in what it thinks are quoted strings/chars, so fails when faced with things like foo' = ... something using a cpp macro here ... One workaround is to install ghc from MacPorts (forces gcc's cpp) or the github ghcformacosx repo (which I think is Homebrew-based? so it depends on how much you like code with no error checking to speak of and curl-pipe-sh "hack me please" installation). 7.8.4 may also provide some way to point cpp to "gcc --traditional -E". Long term, we need to move away from using a C preprocessor for Haskell code; there are no guarantees that it won't try to enforce C syntax on you, like clang's does. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe