haddock the stage2 compiler if HADDOCK_DOCS is YES

Makefile

@@ -148,6 +148,9 @@ stage1 : $(GCC_LIB_DEP) check-all
 stage2 : check-all
 	$(MAKE) -C compiler stage=2 boot
 	$(MAKE) -C compiler stage=2
+ifeq "$(HADDOCK_DOCS)" "YES"
+	$(MAKE) -C compiler stage=2 doc
+endif
 	$(MAKE) -C ghc      stage=2 boot
 	$(MAKE) -C ghc      stage=2
 

compiler/Makefile

@@ -44,6 +44,8 @@ boot:: boot.stage.$(stage)
 
 all:: build.stage.$(stage)
 
+doc:: doc.stage.$(stage)
+
 stage1 ::
 	$(MAKE) stage=1
 
@@ -175,6 +177,9 @@ build.stage.%:
 	$(MAKE) -f Makefile-stage$* stage=$*
 	$(CABAL) register  --distpref dist-stage$* --inplace
 
+doc.stage.%:
+	$(CABAL) haddock --distpref dist-stage$*
+
 # XXX We ought to actually install the (stage 2) library
 install:
 	@: