adafruit · dhalbert · Jul 25, 2020 · Jul 18, 2020 · Jul 21, 2020 · Jul 21, 2020
diff --git a/ports/atmel-samd/Makefile b/ports/atmel-samd/Makefile
@@ -87,25 +87,28 @@ INC += -I. \
 
 ifeq ($(CHIP_FAMILY), samd21)
 PERIPHERALS_CHIP_FAMILY=samd21
-CFLAGS += -Os -DNDEBUG
+OPTIMIZATION_FLAGS ?= -Os
 # TinyUSB defines
 CFLAGS += -DCFG_TUSB_MCU=OPT_MCU_SAMD21 -DCFG_TUD_MIDI_RX_BUFSIZE=128 -DCFG_TUD_CDC_RX_BUFSIZE=128 -DCFG_TUD_MIDI_TX_BUFSIZE=128 -DCFG_TUD_CDC_TX_BUFSIZE=128 -DCFG_TUD_MSC_BUFSIZE=512
 endif
 
 ifeq ($(CHIP_FAMILY), samd51)
 PERIPHERALS_CHIP_FAMILY=sam_d5x_e5x
-CFLAGS += -Os -DNDEBUG
+OPTIMIZATION_FLAGS ?= -O2
 # TinyUSB defines
 CFLAGS += -DCFG_TUSB_MCU=OPT_MCU_SAMD51 -DCFG_TUD_MIDI_RX_BUFSIZE=128 -DCFG_TUD_CDC_RX_BUFSIZE=256 -DCFG_TUD_MIDI_TX_BUFSIZE=128 -DCFG_TUD_CDC_TX_BUFSIZE=256 -DCFG_TUD_MSC_BUFSIZE=1024
 endif
 
 ifeq ($(CHIP_FAMILY), same54)
 PERIPHERALS_CHIP_FAMILY=sam_d5x_e5x
-CFLAGS += -Os -DNDEBUG
+OPTIMIZATION_FLAGS ?= -O2
 # TinyUSB defines
 CFLAGS += -DCFG_TUSB_MCU=OPT_MCU_SAMD51 -DCFG_TUD_MIDI_RX_BUFSIZE=128 -DCFG_TUD_CDC_RX_BUFSIZE=256 -DCFG_TUD_MIDI_TX_BUFSIZE=128 -DCFG_TUD_CDC_TX_BUFSIZE=256 -DCFG_TUD_MSC_BUFSIZE=1024
 endif
 
+# option to override default optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS) -DNDEBUG
+
 $(echo PERIPHERALS_CHIP_FAMILY=$(PERIPHERALS_CHIP_FAMILY))
 #Debugging/Optimization
 ifeq ($(DEBUG), 1)

diff --git a/ports/atmel-samd/boards/kicksat-sprite/mpconfigboard.mk b/ports/atmel-samd/boards/kicksat-sprite/mpconfigboard.mk
@@ -18,3 +18,6 @@ CIRCUITPY_PS2IO = 0
 CIRCUITPY_AUDIOMP3 = 0
 
 CIRCUITPY_ULAB = 0
+
+# Override optimization to keep binary small
+OPTIMIZATION_FLAGS = -Os
diff --git a/ports/atmel-samd/boards/loc_ber_m4_base_board/mpconfigboard.mk b/ports/atmel-samd/boards/loc_ber_m4_base_board/mpconfigboard.mk
@@ -15,3 +15,5 @@ LONGINT_IMPL = MPZ
 CIRCUITPY_AUDIOBUSIO = 0
 
 CIRCUITPY_BITBANG_APA102 = 1
+# Override optimization to keep binary small
+OPTIMIZATION_FLAGS = -Os
diff --git a/ports/atmel-samd/boards/pewpew_m4/mpconfigboard.mk b/ports/atmel-samd/boards/pewpew_m4/mpconfigboard.mk
@@ -46,3 +46,5 @@ CFLAGS_INLINE_LIMIT = 45
 else
 CFLAGS_INLINE_LIMIT = 70
 endif
+# Override optimization to keep binary small
+OPTIMIZATION_FLAGS = -Os
diff --git a/ports/cxd56/Makefile b/ports/cxd56/Makefile
@@ -107,7 +107,6 @@ CFLAGS += \
 	-Dmain=spresense_main \
 	-D_estack=__stack \
 	-c \
-	-Os \
 	-pipe \
 	-std=gnu11 \
 	-mcpu=cortex-m4 \
@@ -123,6 +122,12 @@ CFLAGS += \
 	-fdata-sections \
 	-Wall \
 
+OPTIMIZATION_FLAGS ?= -O2
+
+# option to override compiler optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS)
+
+
 LIBM = "${shell "$(CC)" $(CFLAGS) -print-file-name=libm.a}"
 
 LIBGCC = "${shell "$(CC)" $(CFLAGS) -print-libgcc-file-name}"

diff --git a/ports/esp32s2/Makefile b/ports/esp32s2/Makefile
@@ -101,14 +101,19 @@ CFLAGS += -DSTACK_CANARY_VALUE=0xa5a5a5a5
 #Debugging/Optimization
 ifeq ($(DEBUG), 1)
   CFLAGS += -ggdb
+  OPTIMIZATION_FLAGS ?= -Og
   # You may want to enable these flags to make setting breakpoints easier.
   # CFLAGS += -fno-inline -fno-ipa-sra
 else
-  CFLAGS += -Os -DNDEBUG -ggdb3
+  CFLAGS += -DNDEBUG -ggdb3
+  OPTIMIZATION_FLAGS ?= -O2
   # TODO: Test with -flto
   ### CFLAGS += -flto
 endif
 
+# option to override compiler optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS)
+
 CFLAGS += $(INC) -Werror -Wall -mlongcalls -std=gnu11 -Wl,--gc-sections $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT)
 
 LDFLAGS = $(CFLAGS) -Wl,-nostdlib  -Wl,-Map=$@.map -Wl,-cref

diff --git a/ports/litex/Makefile b/ports/litex/Makefile
@@ -77,12 +77,17 @@ ifeq ($(DEBUG), 1)
   CFLAGS += -ggdb
   # You may want to enable these flags to make setting breakpoints easier.
   CFLAGS += -fno-inline -fno-ipa-sra
+  OPTIMIZATION_FLAGS ?= -Og
 else
-  CFLAGS += -Os -DNDEBUG -ggdb3
+  CFLAGS += -DNDEBUG -ggdb3
+  OPTIMIZATION_FLAGS ?= -O2
   # TODO: Test with -flto
   ### CFLAGS += -flto
 endif
 
+# option to override compiler optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS)
+
 CFLAGS += $(INC) -Werror -Wall -std=gnu11 -nostdlib -fshort-enums $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT)
 
 # TODO: check this

diff --git a/ports/mimxrt10xx/Makefile b/ports/mimxrt10xx/Makefile
@@ -105,9 +105,14 @@ CFLAGS += \
 	-DCPU_$(CHIP_VARIANT) \
 	-DDEBUG \
 	-DIMXRT10XX \
-	-Os -g3 -Wno-unused-parameter \
+	-g3 -Wno-unused-parameter \
 	-ffunction-sections -fdata-sections -fstack-usage
 
+OPTIMIZATION_FLAGS ?= -O2
+
+# option to override compiler optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS)
+
 LD_FILES = $(wildcard boards/$(BOARD)/*.ld) $(addprefix linking/, flash/$(FLASH).ld chip_family/$(CHIP_FAMILY).ld common.ld)
 
 LD_SCRIPT_FLAG := -Wl,-T,

diff --git a/ports/nrf/Makefile b/ports/nrf/Makefile
@@ -86,12 +86,16 @@ INC += -I../../supervisor/shared/usb
 
 #Debugging/Optimization
 ifeq ($(DEBUG), 1)
-  CFLAGS += -ggdb3 -Og
+  CFLAGS += -ggdb3
+  OPTIMIZATION_FLAGS = -Og
 else
-  CFLAGS += -Os -DNDEBUG -ggdb3
+  OPTIMIZATION_FLAGS ?= -O2
+  CFLAGS += -DNDEBUG -ggdb3
   CFLAGS += -flto -flto-partition=none
 endif
 
+# option to override compiler optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS)
 
 CFLAGS += $(INC) -Wall -Werror -std=gnu11 -nostdlib -fshort-enums $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
 

diff --git a/ports/nrf/boards/pca10100/mpconfigboard.mk b/ports/nrf/boards/pca10100/mpconfigboard.mk
@@ -30,3 +30,6 @@ SUPEROPT_GC = 0
 # These defines must be overridden before mpconfigboard.h is included, which is
 # why they are passed on the command line.
 CFLAGS += -DSPIM3_BUFFER_SIZE=0 -DSOFTDEVICE_RAM_SIZE='(32*1024)'
+
+# Override optimization to keep binary small
+OPTIMIZATION_FLAGS = -Os
diff --git a/ports/nrf/boards/simmel/mpconfigboard.mk b/ports/nrf/boards/simmel/mpconfigboard.mk
@@ -32,3 +32,6 @@ CIRCUITPY_WATCHDOG = 1
 # These defines must be overridden before mpconfigboard.h is included, which is
 # why they are passed on the command line.
 CFLAGS += -DSPIM3_BUFFER_SIZE=0 -DSOFTDEVICE_RAM_SIZE='(32*1024)' -DNRFX_SPIM3_ENABLED=0
+
+# Override optimization to keep binary small
+OPTIMIZATION_FLAGS = -Os
diff --git a/ports/stm/Makefile b/ports/stm/Makefile
@@ -85,12 +85,16 @@ ifeq ($(DEBUG), 1)
 	# You may want to enable these flags to make setting breakpoints easier.
 	CFLAGS += -fno-inline -fno-ipa-sra
 else
-	CFLAGS += -Os -DNDEBUG
+	CFLAGS += -DNDEBUG
+	OPTIMIZATION_FLAGS ?= -O2
 	CFLAGS += -ggdb3
 	# TODO: Test with -flto
 	# CFLAGS += -flto
 endif
 
+# to override compiler optimization level, set in boards/$(BOARD)/mpconfigboard.mk
+CFLAGS += $(OPTIMIZATION_FLAGS)
+
 # MCU Series is defined by the HAL package and doesn't need to be specified here
 C_DEFS = -D$(MCU_PACKAGE) -DUSE_HAL_DRIVER -DUSE_FULL_LL_DRIVER -D$(MCU_VARIANT)