diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -33,10 +33,12 @@ USB_INCLUDES = -Imiddlewares/ST/STM32_US
 USB_INCLUDES += -Imiddlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc
 
 # USER_CFLAGS: user C flags (enable warnings, enable debug info)
-USER_CFLAGS = -Wall -g -ffunction-sections -fno-exceptions -fdata-sections -Os
+USER_CFLAGS = -Wall -g -ffunction-sections -fno-exceptions -fdata-sections -Os --function-sections -fno-common
 # USER_LDFLAGS:  user LD flags
 USER_LDFLAGS = -fno-exceptions -ffunction-sections -fno-exceptions -fdata-sections -Wl,--gc-sections
 
+USER_LDFLAGS += --static 
+
 # TARGET_DEVICE: device to compile for
 TARGET_DEVICE = STM32F042x6