Add a .hc building rules for bootstrapping

rules/hs-suffix-rules-srcdir.mk

@@ -16,6 +16,8 @@ define hs-suffix-rules-srcdir
 
 # Preprocessing Haskell source
 
+ifneq "$$(BootingFromHc)" "YES"
+
 $1/$2/build/%.hs : $1/$4/%.ly $$(MKDIRHIER)
 	$$(MKDIRHIER) $$(dir $$@)
 	$$(HAPPY) $$($1_$2_$3_ALL_HAPPY_OPTS) $$< -o $$@
@@ -47,9 +49,14 @@ $1/$2/build/%.$$($3_hcsuf) : $1/$4/%.hs $$($1_$2_HC_DEP)
 $1/$2/build/%.$$($3_hcsuf) : $1/$4/%.lhs $$($1_$2_HC_DEP)
 	$$($1_$2_HC) $$($1_$2_$3_ALL_HC_OPTS) -C $$< -o $$@
 
+endif
+
 # XXX: for some reason these get used in preference to the direct
 # .hs->.o rule, I don't know why --SDM
 
+$1/$2/build/%.$$($3_osuf) : $1/$4/%.hc
+	$$(CC) $$($1_$2_$3_ALL_CC_OPTS) -c $$< -o $$@
+
 # $1/$2/build/%.$$($3_osuf) : $1/$2/build/%.$$($3_way_)hc
 # 	$$($1_$2_HC) $$($1_$2_$3_ALL_HC_OPTS) -c $$< -o $$@
 #