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-rw-r--r--ports/stm32/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile
index 3083c9957..fd5688056 100644
--- a/ports/stm32/Makefile
+++ b/ports/stm32/Makefile
@@ -106,11 +106,11 @@ LDFLAGS += --gc-sections
# Debugging/Optimization
ifeq ($(DEBUG), 1)
CFLAGS += -g -DPENDSV_DEBUG
-COPT = -Og
+COPT ?= -Og
# Disable text compression in debug builds
MICROPY_ROM_TEXT_COMPRESSION = 0
else
-COPT += -Os -DNDEBUG
+COPT ?= -Os -DNDEBUG
endif
# Flags for optional C++ source code