Using ghc-5.04.2 under cygwin, and cygwin (v. 1.3.10-1), I'm having some horrible problems with inconistent treatment of filenames, especially when using (gnu, cygwin) make. In a nutshell, make seems to be passing paths such as "/usr/local/hmake" (etc) to ghc, which is, as I understand it, interpretting these in a manner consistent with windows, but not with cygwin. (i.e., it'd expect the above to be something like: /cygwin/usr/local/hmake, where the root of the cygwin installation is in c:\cygwin. Experimenting with similar arguments to ghc by hand seems to confirm this.

Is there a work-around for this, or is using cygwin and ghc together just an out and out bad idea?

{another candidate for the ghc faq?-} I'd say using absolute paths is a bad idea. cygwin/ghc is my main development environment, and mostly problem-free. The pure-windows-ghc did cause the occasional headache with third-party tools, but the problem has so far not been on the cygwin or ghc side, but always in unwarranted assumptions in the construction of build processes. In the examples I've seen of this conflict, the makefiles in question explicitly forced the use of absolute paths at some point or other. If you absolutely have to do this, 'cygpath' is your friend, ideally used at the places where those makefiles insist on doing ROOT=`pwd` or the like.. (if you can't catch the problem there at the root, you can still try to convert the paths before passing them to ghc proper, but that might become messy). The one occasion where this wasn't sufficient to resolve the issue was in the case of nhc, compiled by ghc, but that was because ghc-compiled executables also don't know about cygwin paths, and the nhc make system relies on feeding the generated tools with absolute paths during the make process in a variety of ways (AFAIR) - not impossible to resolve, but would be a lot of work.. [fiddling with the mount points may lead to other problems - I never saw a reason to try that] Cheers, Claus $ cygpath --help Usage: cygpath [-p|--path] (-u|--unix)|(-w|--windows [-s|--short-name]) filename -a|--absolute output absolute path -c|--close handle close handle (for use in captured process) -f|--file file read file for input path information -i|--ignore ignore missing argument -p|--path filename argument is a path -s|--short-name print Windows short form of filename -u|--unix print Unix form of filename -v|--version output version information and exit -w|--windows print Windows form of filename -A|--allusers use `All Users' instead of current user for -D, -P -D|--desktop output `Desktop' directory and exit -P|--smprograms output Start Menu `Programs' directory and exit -S|--sysdir output system directory and exit -W|--windir output `Windows' directory and exit