tidy up conditional forkProcess() support

Deal gracefully with arrow commands where an expression is expected,
instead of panicking.  (Bug reported by Isaac Jones)

merge to STABLE

clean up pretty printing slightly

Fix a nasty and long-standing bug in the handling of functional dependencies.

The story is told in comments with TcSimplify.tcSimplifyRestricted.  We were
simpifying a group of constraints *twice*: once to establish the type vars to
quantify over, and once "for real" but less brutally.  Unfortunately, the
less-brutally part meant that we did less improvement, which in turn meant
that an invariant (no captured constraints) was violated.  Consequential
bizarre results.

The test is typecheck/should_compile/tc177

Better printing for LHsBinds

Sanity checking

Comments

Add sanity check

Better layout in interppSP

Fix a long-standing bug; the type checker should recover from a failure
in the default method of a class declaration, else the default method
doesn't get added to the type envt, and we get an opaque
	    tcLookupGlobal: `FunnyError.$dmb' is not in scope
message.

Don't call hGetArray with a size of zero (fixes read021).

Add dependency on GHC.TopHandler if this is the main module.

Remove -static flag from non-darwin PowerPC builds
(this was a relic from the long-dead AIX support)

Merge to STABLE.

Apply $libdir hack to GHCi libs in the same way as ordinary .a libs.

Add small embellishment to one of the filename rules.

Ignore #! lines for scripts.

-Wall police

INLINEs for Intel's icc

if X is available, build X11 and HGL packages.

Be clearer about when source files must match module names.

Fail with an error if the interface file we're reading doesn't contain
the module we were expecting.

Fix #ifdef'ed flags for FreeBSD.

comments

Reduce noise if there's no in-tree version of Happy.

Fix a URL link

Comments only

Patches to configuration script for MSYS.  It's not clear that this'll
always work, because we generate paths like /c/mingw/bin, which MinGW
binaries won't understand -- but all of them seem to be fed to the
MSYS shell, which translates them to c:/mingw/bin etc.

Perhaps the Right Thing is to implement msyspath, by analogy with
cygpath, to convert /c/xxx to c:/xxx? 

Anyway, this patch seems to work for now.

Once more revised some details of the Data class.
Comitting the Data.Generics* library in a second.

New chapter on MSYS, filenames etc

Threaded RTS improvements:

  - Make the main_threads list doubly linked.  Have threads
    remove themselves from this list when they complete, rather
    than searching for completed main threads each time around
    the scheduler loop.  This removes an O(n) loop from the
    scheduler, but adds some new constraints (basically completed
    threads must remain on the run queue until dealt with, including
    threads which have been killed by an async exception).

  - Add a pointer from the TSO to the StgMainThread struct, for
    main threads.  This avoids a number of places where we had
    to traverse the list of main threads to find the right one,
    including one place in the scheduler loop.  Adding a field to
    a TSO is cheap.

  - taskStart: we should be resetting the startingWorkerThread flag
    in here.  Not sure why we aren't; maybe this got lost at some point.

  - Use the BlockedOnCCall flags in the non-threaded RTS too.  Q: what
    should happen if a thread does a foreign call which re-enters the
    RTS, and then sends an async exception to the original thread?
    Answer: it should deadlock, which it does in the threaded RTS, and
    this commit makes it do so in the non-threaded RTS too (see
    testsuite/tests/concurrent/should_run/conc040.hs).

Remove Deadlock_closure (not used any more).

add a few RTS ways (combinations) I missed out

Warning police, and omit a useless debugging msg in !RTS_SUPPORTS_THREADS.

wibble

Update version numbering policy: we now allow snapshots along the
stable branch (eg. 6.2.20040229).

Update docs for RTS options and GhcRtsThreaded

Add -fno-generics to SRC_HC_OPTS

build target should use '::' not ':'

make it compile (win32)

Revised dataTypeOf member in "deriving ( ... Data ...)".
This revised schemes relies on the updated modules
Data.Typeable and Data.Generics*.