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This means that, provided the values are small enough, files
serialized are portable between architectures. In particular,
.haddock files are portable.

2 reasons for this:
  - compilation is more predictable.  Adding or removing an instance
    is less likely to force unnecessary recompilation due to
    renumbering other dfun names.
  - it makes it easier to read Core / C-- / asm

The names aren't completely deterministic.  To do that, we'd have to
include package and module names, which would make the symbol names
long and reduce readability.  So the compromise is that if there's a
clash, we disambiguate by adding an integer suffix.  This is fairly
unlikely in practice unless you're using overlapping instances.

Type family instances are handled in the same way, with the same
disambiguation strategy.

The export list was ordered according to the whim of FastStrings,
which meant that interface fingerprints could change for no good
reason, causing spurious recompilation.

Instead, we just put the flags we need in there (e.g. -m64 on OS X 64).
This fixes a problem found by Simon M, where we were compiling
everything with -g, leading to a bloated RTS.

Also, libdir is now part of the --info output, so this subsumes the old
--print-libdir flag.
The mode parsing was getting rather adhoc, so I've tidied it up a bit
in the process.

Patch from
    Max Bolingbroke <batterseapower@hotmail.com>
Rerecorded to avoid conflicts.

They're now fixed to not generate those warnings

We already require GHC 6.8 to build, and that included stripPrefix
in Data.List.

Should fix Solaris build failures

This patch allow you to use "Language CPP", or even "LaNgUaGe CPP",
if you wish, as the manual claims you can.

This fixes the unused imports warning when
    Foo (F(x,y,z))
is imported and
    Foo (F(..))
is exported.

This patch, joint work between and Ian and Simon, fixes Trac #1074
by reporting unused import declarations much more accuratly than 
before.  The specification is described at 

http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/UnusedImports

The implementation is both easier to understand than before, and shorter
too.  

Also fixed are #1148, #2267

Also fixed is -ddump-minimal imports, which now works properly, fixing 
Trac #1792.