makefile: make RUN_LOG_NAME_STEM=foo run to specify name of log

Short explanation: simpler scripting, better impedance match
with makefiles and bazel.

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

Author: oharboe

flow/Makefile

@@ -1051,10 +1051,12 @@ test-unset-and-make-%: ; $(UNSET_AND_MAKE) $*
 klayout:
 	$(KLAYOUT_CMD)
 
+export RUN_LOG_NAME_STEM ?= run
+
 .phony: run
 run:
 	@mkdir -p $(RESULTS_DIR) $(LOG_DIR) $(REPORTS_DIR) $(OBJECTS_DIR)
-	($(OPENROAD_CMD) -no_splash $(if $(filter %.py,$(RUN_SCRIPT)),-python) $(RUN_SCRIPT) 2>&1 | tee $(abspath $(LOG_DIR)/run.log))
+	($(OPENROAD_CMD) -no_splash $(if $(filter %.py,$(RUN_SCRIPT)),-python) $(RUN_SCRIPT) 2>&1 | tee $(abspath $(LOG_DIR)/$(RUN_LOG_NAME_STEM).log))
 
 # Utilities
 #-------------------------------------------------------------------------------