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-rw-r--r--examples/make.mk1
1 files changed, 1 insertions, 0 deletions
diff --git a/examples/make.mk b/examples/make.mk
index 0a07da21c..2ce6fb398 100644
--- a/examples/make.mk
+++ b/examples/make.mk
@@ -150,6 +150,7 @@ GCC_CFLAGS += \
-Wnull-dereference \
-Wuninitialized \
-Wunused \
+ -Wreturn-type \
-Wredundant-decls
# conversion is too strict for most mcu driver, may be disable sign/int/arith-conversion