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-rw-r--r--Makefile.target2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.target b/Makefile.target
index 2464484012..2e8e0a0eef 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -73,7 +73,7 @@ endif
PROGS=$(QEMU_PROG)
# We require -O2 to avoid the stack setup prologue in EXIT_TB
-OP_CFLAGS := -Wall -O2 -g -fno-strict-aliasing
+OP_CFLAGS := -Wall -Wundef -O2 -g -fno-strict-aliasing
# cc-option
# Usage: OP_CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)