If the configure script determined that the build-tree version of happy
is to be used, descend into happy/ and build it, if needs be.

- change the interpretation of FPTOOLS_TOP_ABS, it is now the UNIXy path.
  For Win32, it is of the form <drive>:<path> where '/' is the directory
  separator. Prior to this commit, the directory separator was '\'.
- for the (only) place we need to have a platform-native representation
  of FPTOOLS_TOP_ABS, use FPTOOLS_TOP_ABS_PLATFORM.

Tidy up imports

Improve error msg

--------------------------------------
	Yet another cut at the DmdAnal domains
	--------------------------------------

This version of the domain for demand analysis was developed
in discussion with Peter Sestoft, so I think it might at last
be more or less right!

Our idea is mentally to separate
	strictness analysis
from
	absence and boxity analysis

Then we combine them back into a single domain.  The latter
is all you see in the compiler (the Demand type, as before)
but we understand it better now.

Added a new section that covers lexing and parsing.

if IS_CBITS_LIB is YES: Extend SRC_HS2HS_OPTS in the same way that SRC_CC_OPTS is

---------------------------------------
	Add continuation splitting to Simplify
	---------------------------------------

When the simplifier finds a 'case', it calls mkDupableAlt
to make the "continuation" (that is, the context of the
case expression) duplicatable, so that it can push it into
the case branches.  This is crucial for the case-of-case
transformation.

But it turns out that it's a bad idea to do that when
the context is "I'm the argument of a strict function".  Consider

	f (case x of { True -> False; False -> True }) arg2

where f is a strict function.  Then we *could* (and were)
transforming to

	let $j a = f a arg2
	in
	case x of { True -> $j False; False -> $j True }

But this is in general a terribly bad thing to do.
See the example in comments with Simplify.mkDupableCont.

Correct docs about SPECIALIZE instance; MERGE TO STABLE

Don't restrict doc building to i386-linux.  please merge.

use SET_HDR rather than explicitly setting p->header.info.

Fix up the interpreter following the recent modifications to
suspendThread/resumeThread.  Someone should test that foreign imports
in the interpreter still work.

Change the way we do finalization for duplex handles.  Previously, we
arranged that the read side pointed to the right side via a special
handle type (ReadSideHandle _), and the finalizer points to the write
side.  This turned out to interact badly with hGetContents, which
likes to explicitly close the read side of the handle after it reads
EOF or gets an error, which resulted in double-closes for duplex
handles.

Now we store the pointer from the read side to the write side in the
Handle structure itself, so it doesn't get lost when hGetContents
changes the handle type to SemiClosedHandle.  Furthermore, in hClose
we no longer close the file descriptor associated with the read side
of a duplex handle - the actual close will have to wait until the
finalizer runs, because someone might still be using the write side.

Thanks to Volker Stolz for pointing out the problem.

remove an unnecessary duplicate binding

GC unused import

Remove unused ticks_since_timestamp.

Fix daVinci URL.

Mention in the summary of section 7 that extra arguments to
./configure may be required.

Updated building guide, now incorporating the CVS cheat sheet.

A little more info about type checking

Added a link to apt's External Core document.

Generate .a files into a temporary file before renaming to the actual
target, to avoid a problem whereby 'ar' could leave a partially-built
archive lying around.

comment update

Remove pprTrace

GhcCanonVersion: leave out GhcPatchLevel, causes problems when
the GhcPatchLevel isn't a patchlevel but a date.

prel_PrelHandle_read(): de-hebetudified.

Make recent rts/ changes work by recognising symbols starting
with __stg as being known-funny-things.

Still recognise "^stg" as 'funny', not sure if that's still
needed.

lookupInstEnv: "#ifdef DEBUG"-protect trace code
that got included in prev. commit.

(I'm guessing it either should be removed or moved
into the ASSERT, but I'll let the original committer
decide which).

* Moved CANON_HC_VERSION out of ghc/compiler/Makefile and into mk/config.mk.in
  (and renamed it as GhcCanonVersion).
* Have ghc/driver/Makefile use it; cheaper and more robust than the version
  testing it was already doing.

Optimised defn of CANON_HC_VERSION, synthesise it from config.mk info,
not via an expensive $(shell ...) call.

Use -fvia-C when compiling rename/ParseIface.hs and parser/Parser.hs -
Int16 primops aren't supported by the NCG on all plats.

---------------------------------------
	Fix an obscure overlapping-instance bug
	---------------------------------------

	MERGE TO STABLE BRANCH

When searching for instances, we used bale out if the type
we seek could be instantiated to match the instance (because
it might be so instantiated later, in which case we don't
want to miss the opportunity).

The bug was that we used *matching* whereas we should use
*unification*.

Comments in the file InstEnv.

Auto-rule for INSTALL_DATAS and cbits/ header files:

Nuke $(shell perl -e '...') use, i.e., don't load in and start up
a 3M binary just to capitalise a word (which gets done twice per
invocation of 'make').

gen_Eq_binds: when comparing constructor tags, emit just

   a == b = case con2tag_Foo# a of
              a# -> case con2tag_Foo# b of b# -> a# PrelGHC.==# b#

and not

   a == b = case con2tag_Foo# a of
              a# -> case con2tag_Foo# b of
                      b# -> if a# PrelGHC.==# b# then PrelBase.True else PrelBase.False

(Not that this wouldn't get simplified, but still).

rnHsForeignDecl: 'foreign import's (incl 'f.e.d's) _define_ local toplevel
names, so better use RnEnv.lookupTopBndrRn and not RnEnv.lookupOccRn to
resolve the name.

As was, declaring ForeignImports with the same name as an imported entity
wasn't permitted.

gencode: for completeness sake only, handle CCallTypedefs

ghc-inplace: single-quote -B option to avoid de-escaping those b-slashes

hardtop_plat: escape those backslashes (exponentially so).

Prev. commit upset world order - revert back to printing out
build tree loc. first.

minor simplification