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-rw-r--r--test/nil/testbuild/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/test/nil/testbuild/Makefile b/test/nil/testbuild/Makefile
index 569f8c152..f3983897b 100644
--- a/test/nil/testbuild/Makefile
+++ b/test/nil/testbuild/Makefile
@@ -180,10 +180,10 @@ 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