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Slurp unpackCString even for interfaces

more hacking

Today's hacking; more things work, but StgInterp is rapidly heading
for a brick wall.  Fortunately we're planning to swerve at the last
minute.

Infrastructure for the (machine-independent) assembler.

:l now unloads the previously loaded module collection before loading
the new ones.  This allows you to :l Main, :cd <somewhere-else> and :l
Main again without it saying "compilation IS NOT required".

omit PrelMain from the GHCi library.

remove some duplicate showPasses.

message wibble

add stuff for building GHCi libraries automatically.

Fix problems with errors during renaming causing the PIT to get out of
whack.

typos

- :type now prints names unqualified when possible.
- :module is implemented

Don't commit junk in the Makefile :-(

compiling-with-4.08.1 wibbles

message wibbles: don't print "compilation IS required" in -v0 mode.

Bugfixes, bugfixes:

  - allow compiling expressions in the context of any module we have
    an interface for, including "Prelude".
  - don't forget to pull in things like unpackCString# in the renamer,
    we might need to use them for desugaring Strings, for example.  I'm
    sure there are other things we'll need to pull in too.
  - :quit now works from the interpreter (!)

Zonk the expr we return from typecheckExpr.

Delete pci field from PersistentCMState.  Now that the list of available
packages is a global variable (v_Packages), there's no point in having it
in PersistentCMState.

merge rev. 1.9.2.6

merge rev. 1.44.2.4

Message wibbles.

Only let the finder see the set of packages which will be available for
linking with, rather than all available packages.

Add dummy import dependency to CgExpr so that booting in batch mode works.

* :t works !!!  (but it's a bit excessive about qualifying everything
  at the moment).

* lots of other things work.

Return the correct file name for .stub_[ch] files.

Mostly verbosity changes.

GONE AWAY:  -dshow-passes, -ddump-all, -ddump-most.

NEW:
    -v<n>, where <n> is

    0	|   print errors & warnings only
    1   |   minimal verbosity: print "compiling M ... done." for each module.
    2   |   equivalent to -dshow-passes
    3   |   equivalent to existing "ghc -v"
    4   |   "ghc -v -ddump-most"
    5   |   "ghc -v -ddump-all"

4 & 5 are the same at the moment.  -dshow-passes also prints out the
passes in the driver, and some in the compilation manager.

In the ModIface for an interface from a .hi file, generate an environment

Added rules for GreenCard.

make ":l hello" load hello.hs if it exists.

Clean up CM's messages a bit.

- add default default settings for typecheckExpr
- bugfixes in the interpreter

print (1+2) now works!!

fix some cut-n-pastos

Fix field name checking

add \$Id\$

rm debugging printfs

add missing case

Fix renamer bugs

Split HscResult into HscFail | HscNoRecomp | HscRecomp, and clean up
producers and consumers of such.  In particular, if no recompilation
happens, the resulting iface is put into the HIT instead of being
thrown away.

Also (trivial) unify functions *ModuleInThisPackage with *HomeModule.

wibble

Tag-o.