Merge pull request #1936 from Pinata-Consulting/makefile-cleanup

makefile: put copyright.txt marker file into OBJECTS_DIR

flow/.gitignore

@@ -2,4 +2,3 @@ settings.mk
 vars.sh
 vars.gdb
 vars.tcl
-copyright.txt

flow/Makefile

@@ -536,9 +536,10 @@ UNSET_VARS = for var in $(UNSET_VARIABLES_NAMES); do unset $$var; done
 SUB_MAKE = $(MAKE) $(foreach V,$(COMMAND_LINE_ARGS), $(if $($V),$V=$(shell echo "$($V)" | $(FLOW_HOME)/scripts/escape.sh),$V='')) --no-print-directory DESIGN_CONFIG=$(DESIGN_CONFIG)
 UNSET_AND_MAKE = @bash -c '$(UNSET_VARS); $(SUB_MAKE) $$@' --
 
-copyright.txt:
+$(OBJECTS_DIR)/copyright.txt:
 	@$(OPENROAD_CMD) $(SCRIPTS_DIR)/noop.tcl
-	@touch copyright.txt
+	mkdir -p $(OBJECTS_DIR)
+	@touch $(OBJECTS_DIR)/copyright.txt
 
 # Separate dependency checking and doing a step. This can
 # be useful to retest a stage without having to delete the
@@ -570,7 +571,7 @@ $(if $(5),$(5),$(RESULTS_DIR))/$(1)$(if $(4),$(4),.odb): $(2)
 	$$(UNSET_AND_MAKE) do-$(1)
 
 .PHONY: do-$(1)
-do-$(1): copyright.txt
+do-$(1): $(OBJECTS_DIR)/copyright.txt
 	@echo Running $(3).tcl, stage $(1)
 	@(trap 'mv $(LOG_DIR)/$(1).tmp.log $(LOG_DIR)/$(1).log' EXIT; \
 	 $(OPENROAD_CMD) $(SCRIPTS_DIR)/noop.tcl 2>&1 >$(LOG_DIR)/$(1).tmp.log; \
@@ -985,7 +986,7 @@ nuke: clean_test clean_issues
 	rm -rf ./results ./logs ./reports ./objects
 	rm -rf layer_*.mps macrocell.list *best.plt *_pdn.def
 	rm -rf *.rpt *.rpt.old *.def.v pin_dumper.log
-	rm -f versions.txt copyright.txt dummy.guide
+	rm -f versions.txt $(OBJECTS_DIR)/copyright.txt dummy.guide
 
 .PHONY: vars
 vars: