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Messages involving Template Haskell are deeply puzzling
if you don't know about TH, so it seems better to make
-fth an explicit flag.  It is no longer switched on
by -fglasgow-exts.

Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.

The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level.  The build system now makes no
pretense at being multi-project, it is just the GHC build system.

No doubt this will break many things, and there will be a period of
instability while we fix the dependencies.  A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.

-fignore-breakpoints can be used to ignore breakpoints.

I've removed -fno-code from Main to make it work
equally well with --make and -c.
I've also allowed it not to write hi files unless
-fwrite-iface is given.

I've removed -fno-code from Main to make it work
equally well with --make and -c.
I've also allowed it not to write hi files unless
-fwrite-iface is given.

This seems to be required now that we're stealing more registers.

This commit adds bang-patterns, 
	enabled by -fglasgow-exts or -fbang-patterns
	diabled by -fno-bang-patterns

The idea is described here
	http://haskell.galois.com/cgi-bin/haskell-prime/trac.cgi/wiki/BangPatterns

-ddump-minimal-imports shouldn't turn off recompilation checking

x86_64: pass -fno-unit-at-a-time to gcc.  See comment for details.

Add -stubdir option to control location of generated stub files.  Also
do some clean up while I'm here - remove hscStubCOut/hscStubHOut from
DynFlags, and add

  mkStubPaths :: DynFlags -> Module -> ModLocation -> (FilePath,FilePath)

to Finder.  (this seemed better than caching the stub paths in every
ModLocation, because they are rarely needed and only present in home
modules, and are easily calculated from other available information).

-stubdir behaves in exactly the same way as -odir and -hidir.

Change the default executable name to match the basename of the source
file containing the Main module (or the module specified by -main-is),
if there is one.  On Windows, the .exe extension is added.

As requested on the ghc-users list, and as implemented by Tomasz
Zielonka <tomasz.zielonka at gmail.com>, with modifications by me.

I changed the type of the mainModIs field of DynFlags from Maybe
String to Module, which removed some duplicate code.

Two changes from Krasimir Angelov, which were required for Visual
Haskell:

  - messaging cleanup throughout the compiler.  DynFlags has a new
    field:

    log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()

    this action is invoked for every message generated by the
    compiler.  This means a client of the GHC API can direct messages to
    any destination, or collect them up in an IORef for later
    perusal.

    This replaces previous hacks to redirect messages in the GHC API
    (hence some changes to function types in GHC.hs).

  - The JustTypecheck mode of GHC now does what it says.  It doesn't
    run any of the compiler passes beyond the typechecker for each module,
    but does generate the ModIface in order that further modules can be
    typechecked.

And one change from me:

  - implement the LANGUAGE pragma, finally

Make -fno-code work again

fix bogus #ifdef in defaultHscTarget

x86_64: Pass -fno-asynchronous-unwind-tables to gcc, which eliminates
some unnecessary junk from the via-C generated code and allows
-split-objs to work.

-ddump-hi-diffs shouldn't turn off recompilation checking

Track new semantics of splitLongestPrefix; fixes -main-is bug

Back out previous revision.

It appears that passing -g to the assembly phase of C compilation
results in an object file with broken debug info, that gdb can't
read.  This is probably a bug in gcc and/or binutils, but this change
means that I can't avoid it (unless we were to hack the pipeline to
do .c->.s->.o in one stage instead of two).

Requested by Duncan Coutts: -optc flags get passed to the assembler
phase too.  It's not obvious, when using GHC to compile a .c file,
that options need to be passed both with -optc and -opta - gcc doesn't
need this, for example.

This is an experimental change - if it breaks anything we can back it
out.  If anyone needs to pass flags to the .c->.s phase *only*, then
we will need to add another flag for that purpose.  It seems unlikely,
though (there aren't many flags that affect the assembler only, and
those that do don't conflict with flags for the C phase).

enable splitting on x86_64

Add the -hide-all-packages flag.

Tweaks to get the GHC sources through Haddock.  Doesn't quite work
yet, because Haddock complains about the recursive modules.  Haddock
needs to understand SOURCE imports (it can probably just ignore them
as a first attempt).

Windows wibbles

Complete the transition of -split-objs into a dynamic flag (looks like I
half-finished it in the last commit).

Also: complete the transition of -tmpdir into a dynamic flag, which
involves some rearrangement of code from SysTools into DynFlags.

Someday, initSysTools should move wholesale into initDynFlags, because
most of the state that it initialises is now part of the DynFlags
structure, and the rest could be moved in easily.

Flags cleanup.

Basically the purpose of this commit is to move more of the compiler's
global state into DynFlags, which is moving in the direction we need
to go for the GHC API which can have multiple active sessions
supported by a single GHC instance.

Before:

$ grep 'global_var' */*hs | wc -l
     78

After:

$ grep 'global_var' */*hs | wc -l
     27

Well, it's an improvement.  Most of what's left won't really affect
our ability to host multiple sessions.

Lots of static flags have become dynamic flags (yay!).  Notably lots
of flags that we used to think of as "driver" flags, like -I and -L,
are now dynamic.  The most notable static flags left behind are the
"way" flags, eg. -prof.  It would be nice to fix this, but it isn't
urgent.

On the way, lots of cleanup has happened.  Everything related to
static and dynamic flags lives in StaticFlags and DynFlags
respectively, and they share a common command-line parser library in
CmdLineParser.  The flags related to modes (--makde, --interactive
etc.) are now private to the front end: in fact private to Main
itself, for now.