makefile: market GUI_TIMING=0 better, useful for large designs

This feature is very useful and a bit buried, add a bit
of 'marketing' in progress output.

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

Author: oharboe

flow/Makefile

@@ -162,6 +162,8 @@ export TEST_DIR      ?= $(FLOW_HOME)/test
 
 $(foreach line,$(shell $(SCRIPTS_DIR)/defaults.py),$(eval export $(line)))
 
+export GUI_TIMING ?= 1
+
 PUBLIC=nangate45 sky130hd sky130hs asap7 ihp-sg13g2 gf180
 
 ifneq ($(wildcard $(PLATFORM_HOME)/$(PLATFORM)),)

flow/scripts/gui.tcl

@@ -49,6 +49,7 @@ proc read_timing {input_file} {
   fast_route
 }
 
-if {![env_var_equals GUI_NO_TIMING 1]} {
+if {[env_var_equals GUI_TIMING 1]} {
+  puts "GUI_TIMING=1 reading timing, takes a little while for large designs..."
   read_timing $input_file
 }