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See Note [atomic CAFs] in rts/sm/Storage.c

Ben Gamari authored Oct 12, 2011 and Simon Marlow committed Oct 17, 2011

Fixes build error:

compiler/cmm/PprC.hs:961:33:
    Couldn't match expected type `Platform'
           against inferred type `CmmExpr'
    In the first argument of `pprExpr1', namely `expr'
    In the second argument of `(<+>)', namely `pprExpr1 expr'
    In the first argument of `parens', namely
        `(cast <+> pprExpr1 expr)'

For now, turn off dynlibs when validating

Cabal will use it regardless, and if people are going to use binary then
it's a lot better if they use the one that we ship, rather than
installing a second version.

We now put the libffi objects into the RTS library, rather than trying
to mangle libffi into being a ghc package itself. It would be nicer to
 make it a separate library (but not a ghc package), but for now
 hopefully this will get the build going through on Windows again.

Now that we always link in an extra object, we may as well always
define rtsOptsEnabled in it, rather than having a default value in
rts/hooks/RtsOptsEnabled.c.

Without it we get warnings like:
    ld: warning: could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog

ld gives loads of warnings like:
    ld: warning: text reloc in _base_GHCziArr_unsafeArray_info to _base_GHCziArr_unsafeArray_closure
when linking any program. We're not sure whether this is something we
ought to fix, but for now we use the -Wl,-read_only_relocs,suppress flag
to silence them.