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Merge backend-hacking-branch onto HEAD.  Yay!

Work around stricter CPP in gcc 3.4.1

wibble

avoid string gaps

Avoid string gaps

Avoid string gaps.

Avoid string gaps in CPP'd source.

Take the timestamp of an interpreted linkable from the timestamp of
the source file.  This works better when the local clock is out of
sync with the filesystem, and it's just as accurate.

Fix problem with inline foreign-call changes yesterday.  Foreign call
args sometimes have to be modified using shimFCallArg - nowadays this
is done at code generation time, whereas it used to be done at
pretty-printing time.

Two changes:

  - newly created or unblocked threads go to the back of the run
    queue.  This is fairer because it avoids possible starvation.
    Fixes problem with conc004 test going much slower with optimisation.

  - The context switch flag is only reset after a yield.  Previously,
    it was being reset before we ran a thread, which meant that a tick
    that arrived during GC would be lost, and a thread doing lots of
    GC could hog the CPU.  Now, GC is effectively counted as part of
    the last running thread's timeslice.

MERGE TO STABLE.

Allow case-of-unsafe-ccall to compile to straight-line code, like it
used to.  This has already been fixed on the backend-hacking-branch,
but I'm doing it here so that it can be merged into the STABLE branch,
where it will help to work around a bug.

The bug is in CgExpr.lhs:primRetUnboxedTuple, which picks temporaries
to assign the result of a ccall to.  The Cg monad doesn't have a uniq
supply (in the HEAD), so we always pick the same temporaries.  This
leads to clashes in complex function with multiple ccalls.  Again,
this is already fixed in the backend-hacking-branch.  I don't see an
easy fix for this bug.

The compilation of case-of-unsafe-ccall doesn't suffer from this
problem, and it will help work around some cases of the bug, so I'm
going to merge this onto the STABLE branch after some testing.

Fix scoped type variable example.

Put a "-- " before the location info, since the rest of the output
looks like Haskell source.

DocBook XML is case-sensitive. Note that this is still not correct DocBook, tons
of indexterm elements within varlistentries are still misplaced.

xmlize sgml docbooks

Update from Robert Ennals: allow either the ctags or etags file to be
generated, so as to be more friendly to case-insensitive filesystems.

Bugfix. --auto-ghci-libs doesn't work if the package was previously installed.

Add case for foreign types

Fix foreign-type predicate

Comments only

Fix GHCi buglet when browsing module

Make total_allocated be an ullong, to accommodate programs that do a lot
of allocation.

MERGE TO STABLE

Wibble to :i for (,); make algTyConRhs behave right

Add location information to :i command

-------------------------------
       Sort out the :i command for GHCi
	-------------------------------

The :info command has been broken in the HEAD for some time, since the new IfaceSyn
story.  This commit sorts it out, and makes it nicer than before. For example, when
you :i a record selector, you get a cut-down data type declaration, so you can see
the context.

do the file writes one after another, so if the underlying file system
happens to be case-insensitive we won't run into a file locking issue.

MERGE TO STABLE

Template Haskell improvements

a) Make '() and '[] work.
b) Add tupleTypeName, tupleDataName
b) Try to improve error message for (lack of) existential data constructors in TH

Comments only

oops, back out rev. 1.31

awaitEvent(): for Integrity, use socketpair() instead of pipe() to implement socket()-aborting mechanism

Add a (rather vague) FAQ entry about the readline build problem
reported in bug #988585.

tidy up gcc warnings re: %-related format specifiers, mainly rewriting \%%\% to %%%%

Workaround for hbc: It compiles matching against 0-ary constructors in
list comprehensions into wrong code, e.g.

   [ () | True <- [False] ]

results in something like

   Error: No match in I4680Pinteractive

when issued in hbi.

sec-makefile-dependencies: -o option is no longer supported.

Merge to STABLE.

Small syntactic changes to please hbc's interpretation of the layout rule and records

Correction to the construction of .hi filenames in dependency
generation.

Fixes sourceforge bug #978543

Merge to STABLE

Tiny perf improvement

Add FAQ item: how to compile a program with and without profiling in
the same directory.

Remove "EXOTICA" from the description of -osuf/-hisuf

arrow notation fixes (problems reported bu John Hughes):

* allow an infixexp (exp0) to the left of -<.  This adds 4 more
  shift/reduce conflicts, because it makes if/lambda/let/case/proc
  before -< ambiguous.  This is the same sort of thing as
  "if x then y else z + 1", and as there shifting does the right thing.

* described the grammar more precisely

* fixed an example

merge to STABLE