But what's the best way to manage this? Suppose you have several modules, some of which need no preprocessor, while others need to be preprocessed in different ways (ignoring multiple extensions -- too hard). I've been doing this by using different filename extensions to distinguish them, plus a patched version of Hugs that can be told what filename extensions to accept, plus a preprocessor that uses the filename extensions to decide what to do. (For example, .y files could be sent through happy.)
The latest version of hmake (3.01) has support for calling a preprocessor based on the filename extension, before calling the compiler on the resulting file. Currently, it recognises: .y Happy .ly literate Happy .gc GreenCard .hsc hsc2hs .chs C->HS .hs.cpp C preprocessor I'm not really sure whether the invocation magic for all of these is correct yet, but I would encourage people to try it out and send patches. It is pretty easy to add new preprocessors - there are basically four options to define for each pp in addition to the filename extension. Regards, Malcolm