Another attempt at getting the pipeline stuff right.  Fixed at least
one bug.

-split-objs is entirely reasonable in conjunction with -fasm

wibble

- Implement the mkdepend -X<dir> and --exclude-directory=<dir> options.
- some small cleanups

Removed isLocallyDefinedName test in isDllName, as SPJ's with SM's suggestion
that it's redundant.

The parser didn't properly check that the constructor in a data
declaration really are constructors (ie. begin with an upper case
character).  This patch fixes the problem.

bug reported by: Tim Giesler, a couple of weeks ago.

Update the documentation on the +RTS -C option, and remove the note
saying that it doesn't work.

Implement +RTS -C<n>, the context switch interval flag.  This was
previously advertised in the usage message, but there was a note in
the Users' Guide stating that it didn't work.  Anwyay, I'm going to
consider it a bug and backport to 4.08.1.

Add a cross-ref to the section on Packages from the mention of the
-package flag in the section on linking.

remove mkdependHS from the list of directories.

Remove the old mkdependHS cruft.

Assimilate mkdependHS into the driver, obsoleting the old Perl version.

The functionality is pretty much identical, except a few of the flags
accepted by the old version aren't implemented (--exclude-module,
--exclude-directory, --include-module).  If anyone needs these
options, please speak up.

Many fixes to DLLisation. These were previously covered up because code was
leaking into the import libraries for DLLs, so the fact that some symbols
were thought of as local rather than in another DLL wasn't a problem.

The main problems addressed by this commit are:

1. Fixes RTS symbols working properly when DLLised. They didn't before.
2. Uses NULL instead of stg_error_entry, because DLL entry points can't be
   used as static initialisers.
3. PrelGHC.hi-boot changed to be in package RTS, and export of PrelNum and
   PrelErr moved to PrelBase, so that references to primops & the like
   are cross-DLL as they should be.
4. Pass imports around as Modules rather than ModuleNames, so that
   ModuleInitLabels can be checked to see if they're in a DLL or not.

Now copied from ghc/rts/gmp.h

Allow GMP to be compiled as a DLL.

Simon's Marktoberdorf Commits

1.  Tidy up the renaming story for "system binders", such as
dictionary functions, default methods, constructor workers etc.  These
are now documented in HsDecls.  The main effect of the change, apart
from tidying up, is to make the *type-checker* (instead of the
renamer) generate names for dict-funs and default-methods.  This is
good because Sergei's generic-class stuff generates new classes at
typecheck time.


2.  Fix the CSE pass so it does not require the no-shadowing invariant.
Keith discovered that the simplifier occasionally returns a result
with shadowing.  After much fiddling around (which has improved the
code in the simplifier a bit) I found that it is nearly impossible to
arrange that it really does do no-shadowing.  So I gave up and fixed
the CSE pass (which is the only one to rely on it) instead.


3. Fix a performance bug in the simplifier.  The change is in
SimplUtils.interestingArg.  It computes whether an argment should 
be considered "interesting"; if a function is applied to an interesting
argument, we are more likely to inline that function.
Consider this case
	let x = 3 in f x
The 'x' argument was considered "uninteresting" for a silly reason.
Since x only occurs once, it was unconditionally substituted, but
interestingArg didn't take account of that case.  Now it does.

I also made interestingArg a bit more liberal.  Let's see if we
get too much inlining now.


4.  In the occurrence analyser, we were choosing a bad loop breaker.
Here's the comment that's now in OccurAnal.reOrderRec

    score ((bndr, rhs), _, _)
	| exprIsTrivial rhs 	   = 3	-- Practically certain to be inlined
		-- Used to have also: && not (isExportedId bndr)
		-- But I found this sometimes cost an extra iteration when we have
		--	rec { d = (a,b); a = ...df...; b = ...df...; df = d }
		-- where df is the exported dictionary. Then df makes a really
		-- bad choice for loop breaker

I also increased the score for bindings with a non-functional type, so that
dictionaries have a better chance of getting inlined early


5. Add a hash code to the InScopeSet (and make it properly abstract)
This should make uniqAway a lot more robust.  Simple experiments suggest
that uniqAway no longer gets into the long iteration chains that it used
to.


6.  Fix a bug in the inliner that made the simplifier tend to get into
a loop where it would keep iterating ("4 iterations, bailing out" message).
In SimplUtils.mkRhsTyLam we float bindings out past a big lambda, thus:
	x = /\ b -> let g = \x -> f x x
		    in E
becomes
	g* = /\a -> \x -> f x x
	x = /\ b -> let g = g* b in E
	
It's essential that we don't simply inling g* back into the RHS of g,
else we will be back to square 1.  The inliner is meant not to do this
because there's no benefit to the inlining, but the size calculation
was a little off in CoreUnfold.


7.  In SetLevels we were bogus-ly building a Subst with an empty in-scope
set, so a WARNING popped up when compiling some modules.  (knights/ChessSetList
was the example that tickled it.)  Now in fact the warning wasn't an error,
but the Right Thing to do is to carry down a proper Subst in SetLevels, so
that is what I have now done.  It is very little more expensive.

include GMP's configure files in a src dist.

x.yy.DDMMYYYY should be x.yy.YYYYMMDD for unstable snapshots.

typo

fix for .hc files

Cleanup of the compilation pipeline.  Now the list of phases to run
for each filename is generated statically, rather than on-the-fly.

Things should be more robust; some nonsense combinations of flags and
input files are now thrown out.

Redo the sparc Ccall machinery, so as to correctly handle the case
where one or more of the args to a Ccall is itself a Ccall.  Prior to
the advent of the Stix inliner, this could never happen, but now it
does.

* backup files are only generated, if there is an old dependency file.

* if $Makefile is "-", print dependencies to STDOUT *without* creating
  a backup file.


*** MERGE with 4.08.1 ***

added newline at EOF of package files

Panic if we try to allocate more than a block's worth of memory in one
go.  No fix yet, but at least this is better than going into an
infinite loop at runtime.

- add wORD_SIZE		(size of an StgWord in bytes)
- add bLOCK_SIZE_W	(size of a storage manager block in words)

Add a constant definition for WORD_SIZE, the size of an StgWord in bytes.

Revert part of the previous change, which broke the build by
generating a PrelStable.hi with some bogus kind information in it.

Advised Windows users to read the Windows installation notes for GHC before
trying to build anything.

Pointed out that Windows users should read the GHC installation guide before
trying to build anything.

increase the repeat count; this bug is pretty fragile

Add test for handle finalization bug, fixed in
  1.60      +1 -2      fptools/ghc/lib/std/PrelHandle.lhs
  1.15      +4 -10     fptools/ghc/lib/std/PrelIO.lhs

Fix bug reported by Hannah Schroeter: reading a file lazily using
hGetContents and then closing it using hClose can cause the program to
fall over with a deadlock.

The reason is that when closing the file in lazyRead{Block,Line,Char},
we set the foreign object in the handle to nullFile__, which causes
the finalizer to run (at some point in the future).  The finalizer
takes the MVar in the handle, frees the contents, but never puts the
MVar back.  hClose then tries to take the MVar, and deadlocks.

The solution is not to set the foreign object to nullFile__ in the
first place; I'm not sure why it was done this way, and in fact it
leads to a memory leak.  hClose itself has a similar problem, leading
to a leak of the fileObject.

giving the version number when asked for is NOT an error, therefore
output now goes to stdout (cf. Coding Standards)

update documentation to reflect changes in the format of a package spec.

Sigh, change the package definition again.  We weren't making a
distinction between libraries which need a suffix tag
(eg. libHSstd_p), and those that don't (eg. libHSstd_cbits).

The package spec now has two components for libraries, hs_libraries
(tagged) and extra_libraries (untagged).  The ordering of these
components is important: we specify that hs_libraries are linked
before extra_libraries.  This sounds problematic if you want to link
some plain C libraries before some Haskell libs, but in these cases it
should be possible to create separate packages for the two libs and
specify the dependencies explicitly.

Some changes to the way FFI decls are handled:

  - a foreign export dynamic which returns a newtype of
    an Addr now works correctly.  Similarly for foreign label.

  - unlifted types are not allowed in the arguments of a foreign
    export.  Previously we generated incorrect code for these cases.

Newtypes in FFI declarations now work everywhere they should, as far
as I can see.

These changes will be backported into 4.08.1.

Strictfp-like behaviour is the default now, which can be switched off
via -fexcess-precision. (Has anybody a better name for this option?)

Fix EXTINFO_RTS.

Add EXTINFO_RTS and use it (same as EXTFUN_RTS for info tables).