Merge pull request #3079 from The-OpenROAD-Project-staging/env-ref

scripts/write_ref_sdc.tcl: $env(RESULTS_DIR) -> $::env(RESULTS_DIR)

Author: maliberty

flow/scripts/write_ref_sdc.tcl

@@ -25,7 +25,7 @@ if { [llength $clks] == 0 } {
       create_clock -name $clk_name -period $ref_period $sources
       # Undo the set_propagated_clock so SDC at beginning of flow uses ideal clocks.
       unset_propagated_clock [all_clocks]
-      write_sdc -no_timestamp [file join $env(RESULTS_DIR) "updated_clks.sdc"]
+      write_sdc -no_timestamp [file join $::env(RESULTS_DIR) "updated_clks.sdc"]
       # Reset
       create_clock -name $clk_name -period $period $sources
       set_propagated_clock [all_clocks]