Makefile: limit 'ln -fs' usage to within the results dir and .odb files

ln -fs makes a difference for .odb files, because they can be
large, but for smaller files, simply copy.

Also, limit ln -fs to within the results folder. This removes
chances of surprises, such as files within the results folder
changing when the source file changes.

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/Makefile

@@ -399,11 +399,11 @@ $(RESULTS_DIR)/1_1_yosys.v: $(DONT_USE_LIBS) $(WRAPPED_LIBS) $(DONT_USE_SC_LIB)
 
 $(RESULTS_DIR)/1_synth.v: $(RESULTS_DIR)/1_1_yosys.v
 	mkdir -p $(RESULTS_DIR) $(LOG_DIR) $(REPORTS_DIR)
-	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
+	cp $< $@
 
 $(RESULTS_DIR)/1_synth.sdc: $(SDC_FILE)
 	mkdir -p $(RESULTS_DIR) $(LOG_DIR) $(REPORTS_DIR)
-	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
+	cp $< $@
 
 clean_synth:
 	rm -f  $(RESULTS_DIR)/1_*.v $(RESULTS_DIR)/1_synth.sdc
@@ -532,7 +532,7 @@ $(RESULTS_DIR)/3_place.odb: $(RESULTS_DIR)/3_5_place_dp.odb
 	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
 
 $(RESULTS_DIR)/3_place.sdc: $(RESULTS_DIR)/2_floorplan.sdc
-	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
+	cp $< $@
 
 # Clean Targets
 #-------------------------------------------------------------------------------
@@ -611,7 +611,7 @@ $(RESULTS_DIR)/5_route.odb: $(RESULTS_DIR)/5_2_route.odb
 	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
 
 $(RESULTS_DIR)/5_route.sdc: $(RESULTS_DIR)/4_cts.sdc
-	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
+	cp $< $@
 
 $(RESULTS_DIR)/5_route.v:
 	@export OR_DB=5_route ;\
@@ -674,10 +674,10 @@ $(RESULTS_DIR)/6_1_fill.odb: $(RESULTS_DIR)/5_route.odb
 endif
 
 $(RESULTS_DIR)/6_1_fill.sdc: $(RESULTS_DIR)/5_route.sdc
-	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
+	cp $< $@
 
 $(RESULTS_DIR)/6_final.sdc: $(RESULTS_DIR)/5_route.sdc
-	ln -sf $(shell realpath --relative-to=$(dir $@) $<) $@
+	cp $< $@
 
 $(LOG_DIR)/6_report.log: $(RESULTS_DIR)/6_1_fill.odb $(RESULTS_DIR)/6_1_fill.sdc
 	($(TIME_CMD) $(OPENROAD_CMD) $(SCRIPTS_DIR)/final_report.tcl -metrics $(LOG_DIR)/6_report.json) 2>&1 | tee $(LOG_DIR)/6_report.log