Building On STM32F0

Here's our toolchain:

CC := $(GCC_ARM_BASE)arm-none-eabi-gcc
LD := $(GCC_ARM_BASE)arm-none-eabi-gcc
OBJCPY := $(GCC_ARM_BASE)arm-none-eabi-objcopy
OBJDUMP := $(GCC_ARM_BASE)arm-none-eabi-objdump
SIZE := $(GCC_ARM_BASE)arm-none-eabi-size
AR := $(GCC_ARM_BASE)arm-none-eabi-gcc-ar
GDB := $(GCC_ARM_BASE)arm-none-eabi-gdb

First we include all the libs, and projects:

$(foreach lib,$(VALID_LIBRARIES),$(call include_lib,$(lib)))

include_lib is defined as:

# $(call include_lib,libname)
define include_lib
$(eval TARGET := $(1));
$(eval TARGET_TYPE := LIB);
$(eval include $(MAKE_DIR)/build.mk);
$(eval undefine TARGET; undefine TARGET_TYPE)
endef

We make the binary here:

178 $(BIN_DIR)/%.bin: $(BIN_DIR)/%$(PLATFORM_EXT)                                                       
179   @$(OBJCPY) -O binary $< $(<:$(PLATFORM_EXT)=.bin)

We make application target here:

# Application target
$(BIN_DIR)/$(T)$(PLATFORM_EXT): $($(T)_OBJ) $(call dep_to_lib,$($(T)_DEPS)) | $(T) $(BIN_DIR)
	@echo "Building $(notdir $@) for $(PLATFORM)"
	@$(CC) $($(firstword $|)_CFLAGS) -Wl,-Map=$(BIN_DIR)/$(notdir $(@:%$(PLATFORM_EXT)=%.map)) $^ -o $@ \
		-L$(STATIC_LIB_DIR) $(addprefix -l,$($(firstword $|)_DEPS)) \
		$(LDFLAGS) $(addprefix -I,$($(firstword $|)_INC_DIRS))
	@$(OBJDUMP) -St $@ >$(basename $@).lst
	@$(SIZE) $@

So this is what's happening:

we call cc with -o, and we link all the libraries, then we call objdump