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sdist: make it work on Windows platforms by simplifying 'tar' invocation. Hopefully not at the cost of other plats (i.e., as-yet untested there..)"

When targetting Hugs, the Paths module now uses prefix-independent
paths relative to the location of the Main module of the program,
on all platforms.

For the Hugs target, this replaces the code using GetModuleFileNameA(),
which never worked.  Behaviour under GHC should be unchanged.

This is an unpleasent way of doing it.
Will have to fix once and for all in the next version.

This change was added for ghc-6.6 but broke packages for ghc-6.2.2.

This is more normal.

In particular this means we pick up any cc-options that are
needed for preprocessing the source before haddock reads it.
This fixes the haddock build step for many of the packages in
the ghc-extralibs collection.

Ideally all the Distribution.Compat.* modules would be private,
however there is currently no sensible alternative to the FilePath module
and hiding it at this stage breaks packages.

ghc has supported --numeric-version for ages.

So it now works if you say:
./setup configure --with-compiler=ghc-6.5
ie specifying a path-relative name rather than an absolute path.
We then look for hc-pkg in the same dir as where we found the compiler.
If the compiler appears to have a version suffix then we additionally
and preferentially look for hc-pkg with that same version suffix.
(I'm not sure that bit works if you've got a .exe suffix, perhaps a
windows person could try it / take a look)