makefile: add do-generate_abstract target

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

Author: oharboe

flow/Makefile

@@ -728,6 +728,10 @@ skip_route: $(RESULTS_DIR)/4_cts.odb $(RESULTS_DIR)/4_cts.sdc
 # make skip_resize skip_cts skip_route generate_abstract
 .PHONY: generate_abstract
 generate_abstract: $(RESULTS_DIR)/6_final.gds $(RESULTS_DIR)/6_final.def  $(RESULTS_DIR)/6_final.v $(RESULTS_DIR)/6_final.sdc
+	$(UNSET_AND_MAKE) do-generate_abstract
+
+.PHONY: do-generate_abstract
+do-generate_abstract:
 	($(TIME_CMD) $(OPENROAD_CMD) $(SCRIPTS_DIR)/generate_abstract.tcl -metrics $(LOG_DIR)/generate_abstract.json) 2>&1 | tee $(LOG_DIR)/generate_abstract.log
 
 # Merge wrapped macros using Klayout