Build hslibs first if we're bootstrapping from .hc files.

Changes to allow Hugs to be built with mingw32, not cygwin.  Also,
updates so that DietHEP works properly for mingw32.  Most changes are
trivial (assert --> ASSERT), etc.  For hugs, have deleted queries
about the width of a terminal window, and so the printing of dots
as progress indicators is gone too.  No great loss.  Zapped various
other out-of-date platform-specific junk in machdep.c.

Don't mv, but cp foreign export header file (as was done before)

Add missing AP_UPD case in THUNK_SELECTOR.

* Small fix for SPJ's last huge commit: Remove dependency on ghc-iface
  from Makefile.

* Nuke ghc-recomp.lprl, this hasn't been used for a long time (I hope :-}

(merge when/if SPJ's commit is merged)

Cosmetics: Removed a whole bunch of "Field `foo' is not initialised"
warnings. This should not have any impact on efficiency, as GHC
inserts `recConError "blah"' expressions for uninitialised fields
anyway, and I can't see any danger of space leaks.
(can be merged with 4.07)

Cosmetics: Removed two "Pattern match(es) are overlapped" warnings.
(can be merged with 4.07)

~~~~~~~~~~~~
		Apr/May 2000
		~~~~~~~~~~~~

This is a pretty big commit!  It adds stuff I've been working on
over the last month or so.  DO NOT MERGE IT WITH 4.07!

Interface file formats have changed a little; you'll need
to make clean before remaking.

						Simon PJ

Recompilation checking
~~~~~~~~~~~~~~~~~~~~~~
Substantial improvement in recompilation checking.  The version management
is now entirely internal to GHC.  ghc-iface.lprl is dead!

The trick is to generate the new interface file in two steps:
  - first convert Types etc to HsTypes etc, and thereby
	build a new ParsedIface
  - then compare against the parsed (but not renamed) version of the old
	interface file
Doing this meant adding code to convert *to* HsSyn things, and to
compare HsSyn things for equality.  That is the main tedious bit.

Another improvement is that we now track version info for
fixities and rules, which was missing before.


Interface file reading
~~~~~~~~~~~~~~~~~~~~~~
Make interface files reading more robust.
  * If the old interface file is unreadable, don't fail. [bug fix]

  * If the old interface file mentions interfaces
    that are unreadable, don't fail. [bug fix]

  * When we can't find the interface file,
    print the directories we are looking in.  [feature]


Type signatures
~~~~~~~~~~~~~~~
  * New flag -ddump-types to print type signatures


Type pruning
~~~~~~~~~~~~
When importing
	data T = T1 A | T2 B | T3 C
it seems excessive to import the types A, B, C as well, unless
the constructors T1, T2 etc are used.  A,B,C might be more types,
and importing them may mean reading more interfaces, and so on.
 So the idea is that the renamer will just import the decl
	data T
unless one of the constructors is used.  This turns out to be quite
easy to implement.  The downside is that we must make sure the
constructors are always available if they are really needed, so
I regard this as an experimental feature.


Elimininate ThinAir names
~~~~~~~~~~~~~~~~~~~~~~~~~
Eliminate ThinAir.lhs and all its works.  It was always a hack, and now
the desugarer carries around an environment I think we can nuke ThinAir
altogether.

As part of this, I had to move all the Prelude RdrName defns from PrelInfo
to PrelMods --- so I renamed PrelMods as PrelNames.

I also had to move the builtinRules so that they are injected by the renamer
(rather than appearing out of the blue in SimplCore).  This is if anything simpler.

Miscellaneous
~~~~~~~~~~~~~
* Tidy up the data types involved in Rules

* Eliminate RnEnv.better_provenance; use Name.hasBetterProv instead

* Add Unique.hasKey :: Uniquable a => a -> Unique -> Bool
  It's useful in a lot of places

* Fix a bug in interface file parsing for __U[!]

Add missing case in parsing of inline pragmas.

raise_info, the info table we use for overwriting thunks with an
exception, had the bogus closure type of FUN.  This was mostly
harmless, but caused some confusion for THUNK_SELECTORs, which rightly
assumed that they shouldn't be pointing at FUNs.

The fix is to change the type to THUNK, which is slightly closer to
being true.

This fixes Alastair Reid's "THUNK_SELECTOR: strange selectee" bug.

Fixing up names to make a reasonable use of Java packages.
This is just one of a number of steps before attacking the Prelude.

Fixing up the output order of the inner classes, making postprocessing easier.

Fix compilation errors when OMIT_NATIVE_CODEGEN is on.

MERGE 4.07

* This fix cures the weird 'ifaceBinds' error that
  Sven and George tripped over.  It was quite obscure!

  Basically, there was a top level binding
	f = x
  lying around, which CoreToStg didn't like.  Why hadn't
  it been substituted away?  Because it had a NOINLINE
  pragma.  Why did it have a NOINLINE pragma?  Because
  it's an always-diverging function, so we never want to
  inline it.

Changed ref to building guide to a ref to the installation guide.

Added a few ids to stop weirdly-named web pages being built for sections
without ids.

Only report shadowed names in source files (merge with 4.07)

Tweaked title not to have   (which is simply omitted in HTML Title
meta-info), and upped version no. to 4.07.

Pls mrg.

Removed a bogus XRef.

Lots of ids added so that all HTML pages generated have sensible names.
Various other little tidies up.

Please merge.

Fix unused-import warning --- again!

MERGE 4.07

* When float outwards (full laziness) remember to
  switch off the demand flag.  Else we wrongly
  can transform
	\x -> let y __D = (...) in y+x
  into
	let y __D = (...)
	in \x -> y+x
  In the latter, y is not necessarily demanded;
  it depends whether the function is called.  We
  should switch off the demand flag.

  The fix is right at the bottom in SetLevels.subst_id_info

MERGE 4.07

* Another wibble on records

don't use underscores in type variable names

don't use underscores in type variable names

Don't try to use getclock on HPUX, gettimeofday is more standard in
any case.

Add ids to the book tags.

don't use underscores in type variable names

disable -fwarn-hi-shadowing again, because we duplicate include paths
in the driver too much.

Tried to clear up some backslash confusion under Windows by always using
forward slashes.

Please merge.

Adding a field to the Method constructor, to allow methods
to say what they might raise. This is needed to actually
compile generated code.

Also, the generated code now imports haskell.runtime.*

verbatim no longer supported; now in rts.tex

de-verbatimed (verbatim is no longer supported).

Don't use commas in an SLIT("..")

zap spurious semicolon wibble

Fix a Real Bug(TM) in the new code for detecting dead threads: we
weren't taking into account the case when a ThreadRelocated is found
on the all_threads list.

MERGE 4.07

* Fix records with polymorphic fields (broken by previous 'fix')
  As a tidy-up I also put a TyCon into a FieldLabel

* Fix a glitch with the result-type-sig change

Add tests for result type sigs

Fix bug in diet_hep_initialise to do with argc/argv handling.

*** MERGE WITH 4.07 (once I've checked it works) ***

* Fix result type signatures.  Note that a consequential change is that
  an ordinary binding with a variable on the left
	f = e
  is now treated as a FunMonoBind, not a PatMonoBind.  This makes
  a few things a bit simpler (eg rnMethodBinds)

* Fix warnings for unused imports.  This meant moving where provenances
  are improved in RnNames.  Move mkExportAvails from RnEnv to RnNames.

* Print module names right (small change in Module.lhs and Rename.lhs)

* Remove a few unused bindings
  
* Add a little hack to let us print info about join points that turn
  out not to be let-no-escaped.  The idea is to call them "$j" and report
  any such variables that are not let-no-escaped.

* Some small things aiming towards -ddump-types (harmless but incomplete)

zu => _ (i.e. sync name decoding with OccName :-)