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-rw-r--r--stm/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/stm/Makefile b/stm/Makefile
index 95ee74dc61..2fecd03bad 100644
--- a/stm/Makefile
+++ b/stm/Makefile
@@ -27,9 +27,9 @@ CFLAGS = -I. -I$(PY_SRC) -I$(FATFSSRC) -I$(STMSRC) -Wall -ansi -std=gnu99 $(CFLA
#Debugging/Optimization
ifeq ($(DEBUG), 1)
-CFLAGS = -O0 -ggdb
+CFLAGS += -O0 -ggdb
else
-CFLAGS = -Os -DNDEBUG
+CFLAGS += -Os -DNDEBUG
endif
LDFLAGS = --nostdlib -T stm32f405.ld