Index: denali.pro
===================================================================
diff -u -r9ae3b0d6624904693329309aaf8ff02784c17184 -raa7591d9f61f5d8d5a2b3604d4c37d6cea829700
--- denali.pro	(.../denali.pro)	(revision 9ae3b0d6624904693329309aaf8ff02784c17184)
+++ denali.pro	(.../denali.pro)	(revision aa7591d9f61f5d8d5a2b3604d4c37d6cea829700)
@@ -1,7 +1,7 @@
 QT += qml quick serialbus concurrent charts bluetooth
 CONFIG += c++17 warn_on
 # CONFIG += disable-desktop
-QMAKE_CXXFLAGS += -Wall -Werror -Wimplicit-fallthrough # -save-temps # see .ii
+QMAKE_CXXFLAGS += -Wall -Werror -Wextra -Wimplicit-fallthrough=3 # -save-temps # see .ii
 
 #CONFIG  += disable_crc
 disable_crc {