oops, forgot a reverse

Fix syntax error

Cleanups:

- Move the collect* functions from HsSyn into HsUtils.  Check that we
  have a clean separation of utilties over HsSyn, with the generic
  versions in HsUtils, and the specific versions in RdrHsSyn, RnHsSyn
  and TcHsSyn as appropriate.

- Remove the RdrBinding data type, which was really just a nested list
  with O(1) append, and use OrdList instead.  This makes it much clearer
  that there's nothing strange going on.

- Various other minor cleanups.

fix bogosity spotted by -Wall

New file of miscellaneous utility functions over HsSyn.

Add accurate source location annotations to HsSyn
-------------------------------------------------

Every syntactic entity in HsSyn is now annotated with a SrcSpan, which
details the exact beginning and end points of that entity in the
original source file.  All honest compilers should do this, and it was
about time GHC did the right thing.

The most obvious benefit is that we now have much more accurate error
messages; when running GHC inside emacs for example, the cursor will
jump to the exact location of an error, not just a line somewhere
nearby.  We haven't put a huge amount of effort into making sure all
the error messages are accurate yet, so there could be some tweaking
still needed, although the majority of messages I've seen have been
spot-on.

Error messages now contain a column number in addition to the line
number, eg.

   read001.hs:25:10: Variable not in scope: `+#'

To get the full text span info, use the new option -ferror-spans.  eg.

   read001.hs:25:10-11: Variable not in scope: `+#'

I'm not sure whether we should do this by default.  Emacs won't
understand the new error format, for one thing.

In a more elaborate editor setting (eg. Visual Studio), we can arrange
to actually highlight the subexpression containing an error.  Eventually
this information will be used so we can find elements in the abstract
syntax corresponding to text locations, for performing high-level editor
functions (eg. "tell me the type of this expression I just highlighted").

Performance of the compiler doesn't seem to be adversely affected.
Parsing is still quicker than in 6.0.1, for example.

Implementation:

This was an excrutiatingly painful change to make: both Simon P.J. and
myself have been working on it for the last three weeks or so.  The
basic changes are:

 - a new datatype SrcSpan, which represents a beginning and end position
   in a source file.

 - To reduce the pain as much as possible, we also defined:

      data Located e = L SrcSpan e

 - Every datatype in HsSyn has an equivalent Located version.  eg.

      type LHsExpr id = Located (HsExpr id)

   and pretty much everywhere we used to use HsExpr we now use
   LHsExpr.  Believe me, we thought about this long and hard, and
   all the other options were worse :-)


Additional changes/cleanups we made at the same time:

  - The abstract syntax for bindings is now less arcane.  MonoBinds
    and HsBinds with their built-in list constructors have gone away,
    replaced by HsBindGroup and HsBind (see HsSyn/HsBinds.lhs).

  - The various HsSyn type synonyms have now gone away (eg. RdrNameHsExpr,
    RenamedHsExpr, and TypecheckedHsExpr are now HsExpr RdrName,
    HsExpr Name, and HsExpr Id respectively).

  - Utilities over HsSyn are now collected in a new module HsUtils.
    More stuff still needs to be moved in here.

  - MachChar now has a real Char instead of an Int.  All GHC versions that
    can compile GHC now support 32-bit Chars, so this was a simplification.

PowerPC Linux support for registerised compilation and native code
generation. (object splitting and GHCi are still unsupported).

Code for other platforms is not affected, so MERGE TO STABLE.

PowerPC NCG bugfix: 2-byte data objects should be .short, not .byte

MERGE TO STABLE

Add note about -all_load instead of --whole-archive on MacOS X.

Fixed typo in OpenAL handling.

Completely overhauled OpenGL/GLUT detection magic, making things more
modular. Removed support for Mesa and non-HW-accelerated support on
Windoze. Added initial support for handling missing glut.h header on
MinGW/MSYS (to be completed). Tested on Cygwin (plain, -mno-cygwin,
--without-x), MSYS/MinGW and SuSE 8.2 x86 Linux.

Use tso->id instead of tso as index to thread lables (tsos get relocated).

Please merge

Added the first pieces of an OpenAL binding which has been of my disk for quite
a while. Note that it is built by default when a usable OpenAL library is found,
but this could be disabled via --disable-openal on the configure commandline.
Similar behaviour should probably be the default for all optional libraries.
Note that I have created a new hierarchy rooted at "Sound", the existing
hierarchies didn't fit.

typo

Wibbles to the UNPACK docs.

fix typo

Document UNPACK pragma

On reflection, using the '!!' prefix for unboxing a constructor field
was a mistake:  firstly it has to be written '! !', and secondly it
isn't backwards-compatible.  So instead, we now use the syntax:

   data T = T {-# UNPACK #-} !Int

to unbox a field.  We thought this would be a cute reuse of the UNPACK
pragma.

The effect of -funbox-strict-fields is to add {-# UNPACK #-} to every
strict field.

Fix syntax error

Having tightened up GHC's syntax w.r.t. Haskell 98, it appears that
GHC itself was making use of the more lax syntax.

Fix a rare bug in compacting GC, related to eval_thunk_selector().  This
might be the cause of the "Closure type 0" bug in SourceForge.

Haskell 98 doesn't allow extra commas in record construction/update,
so neither should GHC.

Add a note about avoiding trailing spaces in CVSROOT

Add notes about windows build, esp the need for automake

Restore a couple of functions that are used in ASSERTs.

oops, fix overenthusiastic export-culling (noCCAttached is used in an ASSERT).

GC dead code and export list entries.

GC dead code.

GC export list.

GC dead code.

GC export list.

GC dead code.

GC export list.

Add an export list; GC dead code.

GC export list.

GC dead code.

GC dead code.

GC dead code.

GC some dead code.  In some places, I left useful-looking but
currently unused definitions in place, surrounded by #ifdef UNUSED
... #endif.

* Cleaned up test for GTK_CONFIG
* Nuked unused GTK_VERSION