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-rw-r--r--demos/STM32/RT-STM32F429-DISCOVERY/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/demos/STM32/RT-STM32F429-DISCOVERY/Makefile b/demos/STM32/RT-STM32F429-DISCOVERY/Makefile
index daffd3d85..f99504f74 100644
--- a/demos/STM32/RT-STM32F429-DISCOVERY/Makefile
+++ b/demos/STM32/RT-STM32F429-DISCOVERY/Makefile
@@ -183,10 +183,10 @@ AOPT =
TOPT = -mthumb -DTHUMB
# Define C warning options here
-CWARN = -Wall -Wextra -Wstrict-prototypes
+CWARN = -Wall -Wextra -Wundef -Wstrict-prototypes
# Define C++ warning options here
-CPPWARN = -Wall -Wextra
+CPPWARN = -Wall -Wextra -Wundef
#
# Compiler settings