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-rw-r--r--demos/various/RT-Win32-Simulator/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/demos/various/RT-Win32-Simulator/Makefile b/demos/various/RT-Win32-Simulator/Makefile
index ca25fd0d9..0164f138d 100644
--- a/demos/various/RT-Win32-Simulator/Makefile
+++ b/demos/various/RT-Win32-Simulator/Makefile
@@ -108,7 +108,7 @@ LIBS = $(DLIBS) $(ULIBS)
LDFLAGS = -Wl,-Map=$(PROJECT).map,--cref,--no-warn-mismatch $(LIBDIR)
ASFLAGS = -Wa,-amhls=$(<:.s=.lst) $(ADEFS)
-CPFLAGS = -Wall -Wextra -Wstrict-prototypes -fverbose-asm -Wa,-alms=$(<:.c=.lst) $(DEFS)
+CPFLAGS = -Wall -Wextra -Wundef -Wstrict-prototypes -fverbose-asm -Wa,-alms=$(<:.c=.lst) $(DEFS)
# Generate dependency information
CPFLAGS += -MD -MP -MF .dep/$(@F).d