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-rw-r--r--src/ghdldrv/ghdlsynth.adb2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/ghdldrv/ghdlsynth.adb b/src/ghdldrv/ghdlsynth.adb
index 8ee8e02d8..138dca8df 100644
--- a/src/ghdldrv/ghdlsynth.adb
+++ b/src/ghdldrv/ghdlsynth.adb
@@ -227,6 +227,8 @@ package body Ghdlsynth is
Flag_Debug_Elaborate := True;
elsif Option = "-de" then
Flag_Debug_Noexpand := True;
+ elsif Option = "-dn" then
+ Flag_Debug_Nonull := True;
elsif Option = "-t" then
Flag_Trace_Statements := True;
elsif Option = "-i" then