GHC on Win32 strangeness

[Manuel M. T. Chakravarty]

Hi!

Bryn <brk@jenkon.com> is trying to compile C->Haskell with
GHC on Win32, but ran into some problems.  Firstly,
configure says,

  $ ./configure
  loading cache ./config.cache
  checking host system type... i686-pc-cygwin
  checking target system type... i686-pc-cygwin
  checking build system type... i686-pc-cygwin
  checking for Cygwin environment... (cached) no
  checking for gcc... (cached) gcc
  [..]

So, it says no Cygwin, but identifies the system as
i686-pc-cygwin.  AFAIK, GHC uses mingw32 these days, doesn't
it?  How can this be reliably tested for?  (To exclude
-package posix on that platform.)

Secondly, are there any issues with symlinks?  I append a
sequence of commands that seems to indicate that GHC doesn't
find a file, because it is symlinked.

Any ideas?

Cheers,
Manuel

-=-

Administrator@BRK ~/hipar/build/ghc5/base/admin
$ file BaseVersion.hs
BaseVersion.hs: symbolic link to ../../../../base/admin/BaseVersion.hs

So, change it to an absolute:

Administrator@BRK ~/hipar/build/ghc5/base/admin
$ ln -s /home/hipar/base/admin/BaseVersion.hs BaseVersion.hs

Administrator@BRK ~/hipar/build/ghc5/base/admin
$ ls
BaseVersion.hs  Common.hs  Config.hs  Makefile

Administrator@BRK ~/hipar/build/ghc5/base/admin
$ file BaseVersion.hs
BaseVersion.hs: symbolic link to /home/hipar/base/admin/BaseVersion.hs

The build fails the same way, copy the command line and restrict it to just
the file we changed, to be sure:

Administrator@BRK ~/hipar/build/ghc5/base
$ ghc -M -syslib lang -optdep-f -optdep.depend -iadmin -ierrors -igeneral
-igra
phs -istate -isyms -isyntax -isysdep admin/BaseVersion.hs
ghc.exe: file `admin/BaseVersion.hs' does not exist