On Mon, 2010-04-12 at 06:51 +0100, Malcolm Wallace wrote:

Even without that, it may be possible to get what you want, using -pgmPcpphs -optP-cpp -optP-ansi that is, to override ghc's addition of -traditional with -ansi. However I'm not sure exactly what order the preprocessor arguments will reach cpphs - in a choice between -traditional and -ansi, it is the last one on the cpphs commandline that will take effect.

This worked in my .cabal file: cpp-options: --cpp -ansi ghc-options: -pgmPcpphs Thanks! -- Ashley Yakeley