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There are two new options in the -threaded RTS:
 
  -qm       Don't automatically migrate threads between CPUs
  -qw       Migrate a thread to the current CPU when it is woken up

previously both of these were effectively off, i.e. threads were
migrated between CPUs willy-milly, and threads were always migrated to
the current CPU when woken up.  This is the first step in tweaking the
scheduling for more effective work balancing, there will no doubt be
more to come.

I think this missing dep is what broke my parallel build
I used make -j2 with ghc-6.4.2.20060323 and got:

------------------------------------------------------------------------
==fptools== make boot -wr --jobserver-fds=3,11 -j;
in /var/tmp/portage/ghc-6.4.2_pre20060323/work/ghc-6.4.2.20060323/ghc/includes
------------------------------------------------------------------------
Creating ghcplatform.h...
Done.
gcc -O -O2 -march=k8 -pipe -Wa,--noexecstack    -c mkDerivedConstants.c -o mkDerivedConstants.o
In file included from ghcconfig.h:5,
                 from Stg.h:42,
                 from Rts.h:19,
                 from mkDerivedConstants.c:20:
ghcplatform.h:1:1: unterminated #ifndef
Done.
						    
With this patch applied I can no longer repoduce this build bug.
So I think this patch should be applied to the cvs ghc-6-4-branch too.

This is pretty important when using the linker/bytecode-compiler from binaries
other than GHCi.

... again.
For now, I've added a TODO comment, but sooner or later this will have to
be made gcc-version-independent.

On x86_64 we are using C argument registers for global registers in
the STG machine.  This is always going to be problematic when it comes
to making C calls from STG and compiling via C.  Prior to GCC 4.1.0
(approx) it was possible to just assign the argument expressions to
temporaries to avoid a clash.  Now, we need to add an extra dummy
function call as a barrier between the temporary assignments and the
actual call.  The dummy call is removed by the mangler.

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.

We need to use GNUC3_ATTRIBUTE(used) to force gcc to keep the
definition of StgRunIsImplementedInAssembler() around.  In some cases
we had already made this function external rather than static to get
around the problem, but GNUC3_ATTRIBUTE(used) is a better fix.

addresses #492

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.

fixes failures in yesterday's testsuite run

Yet another attempt at shutdown & interruption.  This one appears to
work better; ^C is more responsive in multi threaded / SMP, and I
fixed one case where the runtime wasn't responding to ^C at all.