remove unused imports

remove unused imports

remove unused imports; misc cleanup

remove unused imports; misc cleanup

remove unused imports

use MachLabel rather than MachLitLit for compiling foreign label and
foreign export dynamic.

fix typo

undo what appears to be an accidental commit

Fix up the sparc native code generator.  Mostly dull stuff.  Notable
changes:

* Cleaned up ccall mechanism for sparc somewhat.

* Rearranged assignment of sparc floating point registers (includes/MachRegs.h)
  so the NCG's register allocator can handle the double-single pairing
  issue without modification.  Split VirtualRegF into VirtualRegF and
  VirtualRegD, and split RcFloating into RcFloat and RcDouble.  Net effect
  is that there are now three register classes -- int, float and double,
  and we pretend that sparc has some float and some double real regs.

* (A fix for all platforms): propagate MachFloats through as StFloats,
  not StDoubles.  Amazingly, until now literal floats had been converted
  to and treated as doubles, including in ccalls.

Test completed, file deleted.

New autoconf tests for ghc version from Michael Weber, with minor
modifications by me.

workaround for strange gcc-ism: elide 'popl %edx' in the epilogue.

Test file; will shortly be removed.

Removed carriage returns (\r) from source files. Please don't check in such
things; they can cause problems on Cygwin (funnily enough). I'm looking into
how to avoid commiting carriage returns when working under Windows.

Third attempt by two people trying to get a simple fprintf right
again...   :-}

Install HsStd.h, stgio.h, stgerror.h, and fileObject.h, too. Hmmm,
this looks not particularly nice, perhaps we should merge those into a
single HsStd.h some day.

By definition (sec. 7.3 in the H98 report), userError raises an
IOError, so Prelude.catch should catch UserError exceptions, too.
Apart from not conforming to the report, without this patch GHC's
typechecker falls straight on its face.

Synched section on packages with new generalized package file format

Generalized the package file format a little bit: include directories,
include files, and options are now lists of Strings.

After the last fix in PprAbs.ppr_amode, we now need a cast from
StgClosure* to P_ in UPD_FRAME_UPDATEE. I'm not sure if this is the
nicest way to fix this, CgCon.cgReturnDataCon is another candidate. It
looks a little bit like PrimRep distinguishes not enough between the
different kind of pointers (there's no alternative for L_).

Fixed Show instance for Exception

Synch format string with actual args

This commit moves the instance environment out of the Class data
structure, where it was immutable, to part of the type-checker
environment.  This change is absolutely essential as part of
our move to GHCi, and I think it's also going to be necessary
for Andrei's work on generic functions.

As part of this change, we can remove

  a) types/InstEnv.*	(thereby also removing a hi-boot loop)
  b) a tc-fixpoint-loop in TcModule

Both of these are worthwhile simplifications.

Improve comments

Fix duplicate class assertion error msg

Rearrange exception stuff, as per my message on glasgow-haskell-users
recently.

The main change is the IOError type is now a synonym for Exception.
IO.ioError can therefore be used for throwing exceptions.  IO.catch
still catches only IO exceptions, for backwards compatibility.

The interface exported by Exception has changed somewhat:

	try       :: IO a -> IO (Either Exception a)
	tryJust   :: (Exception -> Maybe b) -> a    -> IO (Either b a)

	catch     :: IO a -> (Exception -> IO a) -> IO a
	catchJust :: (Exception -> Maybe b) -> IO a -> (b -> IO a) -> IO a

	ioErrors		:: Exception -> Maybe IOError
	arithExceptions 	:: Exception -> Maybe ArithException
	errorCalls		:: Exception -> Maybe String
	dynExceptions		:: Exception -> Maybe Dynamic
	assertions		:: Exception -> Maybe String
	asyncExceptions 	:: Exception -> Maybe AsyncException

raiseInThread is now called throwTo.

Where possible, the old functions have been left around, but marked
deprecated.

Remove the cast from CMacroExprs - it doesn't appear to be needed.
This fixes the recently introduced bug when compiling CCS_HDR macros
in profiling code.

fix -keep-hc-file-too

revert rev. 1.81

Typo

Fix obvious typo (pprStgARg for pprStgArg).  Clearly not a frequently-
tickled part of the compiler!

* Improve the warning "M is imported but nothing from it is used"
  In particular, don't warn if some instances from it are imported.

  It's pretty much impossible to do the Right Thing always.
  A comment in Rename.lhs says
	-- NOTE: Consider
	--	      module This
	--		import M ()
	--
	--	 The import M() is not *necessarily* redundant, even if
	-- 	 we suck in no instance decls from M (e.g. it contains
	--	 no instance decls, or This contains no code).  It may be
	--	 that we import M solely to ensure that M's orphan instance
	--	 decls (or those in its imports) are visible to people who
	--	 import This.  Sigh.
	--	 There's really no good way to detect this, so the error message
	--	 in RnEnv.warnUnusedModules is weakened instead

* Minor comment changes to RnIfaces.lhs

* Use NameEnv instead of UFM in TcEnv (tidy up only)

Add Marcin Kowalczyk and Michael Weber to the "Additional
Contributors" section.

A string constant block can consist of multiple .string/.ascii
directives.  The sparc-specific code in this file already handled this
properly, but the x86 code was wrong.

no need to set hsc_lang = HscC when -split-objs is on.

New form of literal: MachLabel, for addresses of labels.  Used by
foreign label instead of MachLitLit now.

Real lit-lits now cause the NCG to panic.

Also: removed CLitLit from AbsCSyn; it was only used in one place for
a purpose it shouldn't have been used for in the first place.

Corrected URLs.

New section on Packages, collecting together the various
package-related documentation and adding some new stuff about the package
management features.

Bump the version no.

ghc 4.06 didn't have -package, so use it only for 4.07+.