workaround for ghci fragility in reusing objects compiled with ghc

.ghci

@@ -1,4 +1 @@
--- make ghci use precompiled modules, and C library
-:set -outputdir=tmp
-:set -IUtility
 :load Common

Makefile

@@ -221,4 +221,8 @@ osxapp:
 	rm -f tmp/git-annex.dmg.bz2
 	bzip2 tmp/git-annex.dmg
 
+# used by ./ghci
+getflags:
+	@echo $(ALLFLAGS)
+
 .PHONY: $(bins) test install

ghci

@@ -0,0 +1,5 @@
+#!/bin/sh
+# This runs ghci with the same flags used when compiling with ghc.
+# Certian flags need to be the same in order for ghci to reuse compiled
+# objects.
+ghci $(make getflags) $@