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-rw-r--r--Makeconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/Makeconfig b/Makeconfig
index 9078b29306..fa9fb63851 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -685,6 +685,7 @@ ifeq ($(all-warnings),yes)
 else
 +gccwarn := -Wall -Wwrite-strings -Winline
 endif
++gccwarn += -Wundef
 +gccwarn-c = -Wstrict-prototypes
 
 # We do not depend on the address of constants in different files to be