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In decodeFloat_Int# we have the C-- code:

    mp_tmp1  = Sp - WDS(1);
    mp_tmp_w = Sp - WDS(2);
    
    /* arguments: F1 = Float# */
    arg = F1;
    
    /* Perform the operation */
    foreign "C" __decodeFloat_Int(mp_tmp1 "ptr", mp_tmp_w "ptr", arg) [];
    
    /* returns: (Int# (mantissa), Int# (exponent)) */
    RET_NN(W_[mp_tmp1], W_[mp_tmp_w]);

Which all looks quite reasonable.  The problem is that RET_NN() might
assign the results to the stack (with an unregisterised back end), and
in this case the arguments to RET_NN() refer to the same stack slots
that will be assigned to.

The code generator should do the right thing here, but it wasn't - it
was assuming that it could assign the results sequentially.  A 1-line
fix to use emitSimultaneously rather than emitStmts (plus comments).

added:

 primop  TraceEventOp "traceEvent#" GenPrimOp
   Addr# -> State# s -> State# s
   { Emits an event via the RTS tracing framework.  The contents
     of the event is the zero-terminated byte string passed as the first
     argument.  The event will be emitted either to the .eventlog file,
     or to stderr, depending on the runtime RTS flags. }

and added the required RTS functionality to support it.  Also a bit of
refactoring in the RTS tracing code.

The docs are no longer built and installed separately.

We used to say 10.3, but this gives
    -rpath can only be used when targeting Mac OS X 10.5 or later 
when building shared libraries.
Patch from mwotton.

rather than the "second" argument. Fixes trac #3505.

Spotted by Judah.

Haddock uses TcRnDriver.tcRnGetInfo, which is only available if
GHCI is built. Set HADDOC_DOCS to NO if GhcWithInterpreter is NO,
and disable the haddock build if HADDOC_DOCS = NO.

Cleaning should always succeed now

Add changes that we inherit from haskeline

This fixes at least one problem: libHSffi-ghc<version>.so wasn't being
cleaned, because $(dyn_libsuf) wasn't defined while cleaning.