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Now, adding dyn to $(GhcLibWays) is how shared libs are enabled.
Everything else keys off that, rather than testing
$(BuildSharedLibs).

A few changes bundled together here:

 - Add -package-id flag, like -package but takes an
   InstalledPackageId as an argument (mainly for Cabal)
   (docs to follow)

 - Fix the shadowing behaviour: if we end up with
   two packages with the same name/version that came from
   different package databases, then one will shadow the
   other.  This may mean we have to disable other packages
   that depended on the now-shadowed package.  Lots of
   refactoring to ensure that we can get reasonable diagnostics when
   this happens

<command line>: cannot satisfy -package shadowdep: 
    shadowdep-1-XXX is unusable due to missing or recursive dependencies:
      shadow-1-XXX
    (use -v for more information)

and fix up related cruft

A fine bug report (#3403) demonstrated that we were losing the tail
call property when a complicated pattern match was involved.  After
a bit of investigation I discovered that the culprit was the failure
join-point introduced by the pattern matcher.  It was a zero-argument
thunk, which is not very CPR-friendly, and that interacted badly with
CPR worker/wrapper.

It's easy to fix, the same way that we fix other join points, by supplying
a dummy argument (that is not really passed at runtime.

When checking the interface exported by a hs-boot file against the
Real Thing, I'd failed to check the kind of a type constructor.  If you
get it wrong, the inconsistency leads to all manner of mischief, as 
'wkahl' reports in #3468.

This patch should do the job.

  - tracing facilities are now enabled with -DTRACING, and -DDEBUG
    additionally enables debug-tracing.  -DEVENTLOG has been
    removed.

  - -debug now implies -eventlog

  - events can be printed to stderr instead of being sent to the
    binary .eventlog file by adding +RTS -v (which is implied by the
    +RTS -Dx options).

  - -Dx debug messages can be sent to the binary .eventlog file
    by adding +RTS -l.  This should help debugging by reducing
    the impact of debug tracing on execution time.

  - Various debug messages that duplicated the information in events
    have been removed.

The check for whether a Capability was free was inverted, which harmed
performance for callbacks.

Also add a panic for resurrecting a thread blocked on an exception,
since it should never happen.

Fixes an ASSERTION failure with concprog001, -threaded -debug, +RTS -N2

This has no effect with static libraries, but when the RTS is in a
shared library it does two things:

 - it prevents the function from being exposed by the shared library

 - internal calls to the function can use the faster non-PLT calls,
   because the function cannot be overriden at link time.

Should help to fix the build on OpenBSD (together with a corresponding
patch to libraries/base).

When there are some absolute include dirs, don't create arguments
like -Ilibraries/base//usr/local/include.

I need this fix for injecting the iconv include dir (which is
/usr/local/include on OpenBSD) into the build of libraries/base.

rolling back:

Mon Aug  3 11:44:13 BST 2009  Simon Marlow <marlowsd@gmail.com>
  UNDO: Add -r option to darcs-all, and remove push-all (#3375)
  Contributed by: seliopou@gmail.com
      
  This patch modifies darcs-all to have feature parity with push-all by
  recognizing two new options.
  
      * -i, equivalent to --ignore-failure in push-all
      * -r <repo>, specifies the remote repository darcs commands will use
  
  Some example commands:
  
  Get the libraries from a repository of your choosing. This is useful
  when working with a git mirror:
  
      $ ./darcs-all -r http://darcs.haskell.org get
  
  Pull changes. Used to be:
  
      $ ./push-all --pull http://darcs.haskell.org
  
  Is now:
  
      $ ./darcs-all -r http://darcs.haskell.org pull
  
  Or to use the default remote of the ghc repository:
  
      $ ./darcs-all pull

    M ./darcs-all -79 +33
    A ./push-all

We need to change a dependency on
    pkg-inplace
to
    pkg-$abihash
when installing

We were running into problems like:
    for f in  LICENSE configure config.sub config.guess [...]
    make[2]: execvp: /bin/sh: Argument list too long
This patch moves the loop into make, rather than the shell.

That is, unless we're printing in LeftMode, where we bypass encoding
for speed.  This is safe, because LeftMode is used for outputting C or
asm, where everyting is Z-encoded and hence ASCII.

Error messages and other compiler output containing Unicode will now
appear correctly according to the locale settings.

I've updated the wiki page about the RTS headers
  http://hackage.haskell.org/trac/ghc/wiki/Commentary/SourceTree/Includes
to reflect the new layout and explain some of the rationale.  All the
header files now point to this page.