Parallelize stage0 build

Author: bacek

tools/build/Makefile.in

@@ -280,14 +280,27 @@ $(PAST_PBC): $(PAST_SOURCES) $(DYNEXT_TARGET)
 
 $(STAGE0): $(STAGE0_PBCS)
 
-$(STAGE0_PBCS): $(DYNEXT_TARGET) $(PAST_PBC) $(STAGE0_SOURCES)
-	$(PARROT) -o $(STAGE0)/$(REGEX_PBC)        src/stage0/Regex-s0.pir
-	$(PARROT) -o $(STAGE0)/$(HLL_PBC)          src/stage0/HLL-s0.pir
-	$(PARROT) -o $(STAGE0)/$(P6REGEX_PBC)      src/stage0/P6Regex-s0.pir
-	$(PARROT) -o $(STAGE0)/$(NQP_MO_PBC)       src/stage0/NQPMO-s0.pir
-	$(PARROT) -o $(STAGE0)/$(NQP_PBC)          src/stage0/NQP-s0.pir
-	$(PARROT) -o $(STAGE0)/$(CORE_SETTING_PBC) src/stage0/NQPCORE.setting-s0.pir
-	$(PARROT) -o $(STAGE0)/$(MODULE_LOADER_PBC) src/stage0/ModuleLoader-s0.pir
+$(STAGE0)/$(NQP_MO_PBC):  src/stage0/NQPMO-s0.pir
+	$(PARROT) -o $@ $<
+
+$(STAGE0)/$(MODULE_LOADER_PBC): src/stage0/ModuleLoader-s0.pir $(STAGE0)/$(NQP_MO_PBC)
+	$(PARROT) -o $@ $<
+
+$(STAGE0)/$(REGEX_PBC):   src/stage0/Regex-s0.pir
+	$(PARROT) -o $@ $<
+
+$(STAGE0)/$(HLL_PBC):     src/stage0/HLL-s0.pir
+	$(PARROT) -o $@ $<
+
+$(STAGE0)/$(P6REGEX_PBC): src/stage0/P6Regex-s0.pir
+	$(PARROT) -o $@ $<
+
+$(STAGE0)/$(NQP_PBC):     src/stage0/NQP-s0.pir
+	$(PARROT) -o $@ $<
+
+$(STAGE0)/$(CORE_SETTING_PBC): src/stage0/NQPCORE.setting-s0.pir
+	$(PARROT) -o $@ $<
+
 
 $(STAGE1): $(STAGE1_PBCS)