atmel-samd: Use link time optimization to reduce code size of builds …

…which

share space with the file system.

"Express" builds with SPI flash crash the compiler for some reason so its
currently disabled for them.

atmel-samd/Makefile

@@ -115,7 +115,7 @@ CFLAGS_CORTEX_M0 = \
 	-DTC_ASYNC=true \
 	-DUSB_DEVICE_LPM_SUPPORT \
 	--param max-inline-insns-single=500
-CFLAGS = $(INC) -Wall -Werror -std=gnu11 -nostdlib $(CFLAGS_CORTEX_M0) $(COPT)
+CFLAGS = $(INC) -Wall -Werror -std=gnu11 -nostdlib $(CFLAGS_CORTEX_M0) $(COPT) $(BOARD_CFLAGS)
 
 #Debugging/Optimization
 # TODO(tannewt): Figure out what NDEBUG does. Adding it to the debug build
@@ -139,8 +139,8 @@ CFLAGS += -DMICROPY_QSTR_EXTRA_POOL=mp_qstr_frozen_const_pool
 CFLAGS += -DMICROPY_MODULE_FROZEN_MPY
 endif
 
-LIBM_FILE_NAME   = $(shell $(CC) $(CFLAGS) -print-file-name=libm.a)
-LDFLAGS = -mthumb -mcpu=cortex-m0plus -Lasf/thirdparty/CMSIS/Lib/GCC/ -LQTouch/ -L$(dir $(LIBM_FILE_NAME)) -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
+#LIBM_FILE_NAME   = $(shell $(CC) $(CFLAGS) -print-file-name=libm.a)
+LDFLAGS = $(CFLAGS) -nostartfiles -fshort-enums -mthumb -mcpu=cortex-m0plus -Lasf/thirdparty/CMSIS/Lib/GCC/ -LQTouch/ -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
 LIBS = -larm_cortexM0l_math -lsamd21_qtouch_gcc -lm -lgcc -lc
 
 SRC_ASF = $(addprefix asf/sam0/,\

atmel-samd/asf/sam0/utils/cmsis/samd21/source/gcc/startup_samd21.c

@@ -127,7 +127,7 @@ void AC1_Handler             ( void ) __attribute__ ((weak, alias("Dummy_Handler
 #endif
 
 /* Exception Table */
-__attribute__ ((section(".vectors")))
+__attribute__ ((used, section(".vectors")))
 const DeviceVectors exception_table = {
 
         /* Configure Initial Stack Pointer, using linker-generated symbols */
@@ -229,7 +229,7 @@ const DeviceVectors exception_table = {
  * \brief This is the code that gets called on processor reset.
  * To initialize the device, and call the main() routine.
  */
-void Reset_Handler(void)
+__attribute__ ((used))void Reset_Handler(void)
 {
         uint32_t *pSrc, *pDest;
 

atmel-samd/boards/arduino_zero/mpconfigboard.mk

@@ -5,3 +5,5 @@ USB_PID = 0x824D
 FLASH_IMPL = internal_flash.c
 
 CHIP_VARIANT = SAMD21G18A
+
+BOARD_CFLAGS = -flto

atmel-samd/boards/feather_m0_adalogger/mpconfigboard.mk

@@ -5,3 +5,5 @@ USB_PID = 0x8015
 FLASH_IMPL = internal_flash.c
 
 CHIP_VARIANT = SAMD21G18A
+
+BOARD_CFLAGS = -flto

atmel-samd/boards/feather_m0_basic/mpconfigboard.mk

@@ -5,3 +5,5 @@ USB_PID = 0x8015
 FLASH_IMPL = internal_flash.c
 
 CHIP_VARIANT = SAMD21G18A
+
+BOARD_CFLAGS = -flto

atmel-samd/boards/gemma_m0/mpconfigboard.mk

@@ -5,3 +5,5 @@ USB_PID = 0x8015
 FLASH_IMPL = internal_flash.c
 
 CHIP_VARIANT = SAMD21E18A
+
+BOARD_CFLAGS = -flto

atmel-samd/boards/trinket_m0/mpconfigboard.mk

@@ -5,3 +5,5 @@ USB_PID = 0x8015
 FLASH_IMPL = internal_flash.c
 
 CHIP_VARIANT = SAMD21E18A
+
+BOARD_CFLAGS = -flto

atmel-samd/main.c

@@ -500,7 +500,7 @@ void samd21_init(void) {
     nvm_set_config(&config_nvm);
 }
 
-int main(int argc, char **argv) {
+int main(void) {
     // initialise the cpu and peripherals
     samd21_init();
 

py/objnamedtuple.c

@@ -125,7 +125,11 @@ mp_obj_t namedtuple_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t
     return MP_OBJ_FROM_PTR(tuple);
 }
 
-const mp_rom_obj_tuple_t namedtuple_base_tuple = {{&mp_type_tuple}, 1, {MP_ROM_PTR(&mp_type_tuple)}};
+const mp_rom_obj_tuple1_t namedtuple_base_tuple = {
+    .base = {&mp_type_tuple},
+    .len = 1u,
+    .items = {MP_OBJ_FROM_PTR(&mp_type_tuple)}
+};
 
 STATIC mp_obj_t mp_obj_new_namedtuple_type(qstr name, mp_uint_t n_fields, mp_obj_t *fields) {
     mp_obj_namedtuple_type_t *o = m_new_obj_var(mp_obj_namedtuple_type_t, qstr, n_fields);

py/objnamedtuple.h

@@ -25,6 +25,9 @@
  * THE SOFTWARE.
  */
 
+#ifndef __MICROPY_INCLUDED_PY_OBJNAMEDTUPLE_H__
+#define __MICROPY_INCLUDED_PY_OBJNAMEDTUPLE_H__
+
 #include <string.h>
 
 #include "py/nlr.h"
@@ -50,6 +53,8 @@ void namedtuple_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest);
 
 mp_obj_t namedtuple_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args);
 
-const mp_rom_obj_tuple_t namedtuple_base_tuple;
+const mp_rom_obj_tuple1_t namedtuple_base_tuple;
 
 #endif // MICROPY_PY_COLLECTIONS
+
+#endif  // __MICROPY_INCLUDED_PY_OBJNAMEDTUPLE_H__

py/objtuple.h

@@ -36,10 +36,18 @@ typedef struct _mp_obj_tuple_t {
 
 typedef struct _mp_rom_obj_tuple_t {
     mp_obj_base_t base;
-    mp_uint_t len;
+    uint32_t len;
     mp_rom_obj_t items[];
 } mp_rom_obj_tuple_t;
 
+// This is identical to the type above except it makes it clear that there is
+// only one item. This makes lto happy with the namedtuple_base_tuple.
+typedef struct _mp_rom_obj_tuple1_t {
+    mp_obj_base_t base;
+    uint32_t len;
+    mp_rom_obj_t items[1];
+} mp_rom_obj_tuple1_t;
+
 void mp_obj_tuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind);
 mp_obj_t mp_obj_tuple_unary_op(mp_uint_t op, mp_obj_t self_in);
 mp_obj_t mp_obj_tuple_binary_op(mp_uint_t op, mp_obj_t lhs, mp_obj_t rhs);

shared-bindings/time/__init__.c

@@ -139,7 +139,7 @@ STATIC const mp_map_elem_t time_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_monotonic), (mp_obj_t)&time_monotonic_obj },
     { MP_OBJ_NEW_QSTR(MP_QSTR_sleep), (mp_obj_t)&time_sleep_obj },
     #if MICROPY_PY_COLLECTIONS
-    { MP_OBJ_NEW_QSTR(MP_QSTR_struct_time), (mp_obj_t)&struct_time_type_obj },
+    //{ MP_OBJ_NEW_QSTR(MP_QSTR_struct_time), (mp_obj_t)&struct_time_type_obj },
     #endif
 };