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Makefile
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Makefile
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# CanBoot build system
#
# Copyright (C) 2016-2020 Kevin O'Connor <[email protected]>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
# Output directory
OUT=out/
# Kconfig includes
export KCONFIG_CONFIG := $(CURDIR)/.config
-include $(KCONFIG_CONFIG)
# Common command definitions
CC=$(CROSS_PREFIX)gcc
AS=$(CROSS_PREFIX)as
LD=$(CROSS_PREFIX)ld
OBJCOPY=$(CROSS_PREFIX)objcopy
OBJDUMP=$(CROSS_PREFIX)objdump
STRIP=$(CROSS_PREFIX)strip
CPP=cpp
PYTHON=python3
# Source files
src-y =
dirs-y = src
# Default compiler flags
cc-option=$(shell if test -z "`$(1) $(2) -S -o /dev/null -xc /dev/null 2>&1`" \
; then echo "$(2)"; else echo "$(3)"; fi ;)
CFLAGS := -I$(OUT) -Isrc -I$(OUT)board-generic/ -std=gnu11 -Os -MD \
-Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \
-ffunction-sections -fdata-sections
CFLAGS += -flto -fwhole-program -fno-use-linker-plugin -ggdb3
OBJS_canboot.elf = $(patsubst %.c, $(OUT)src/%.o,$(src-y))
OBJS_canboot.elf += $(OUT)compile_time_request.o
CFLAGS_canboot.elf = $(CFLAGS) -Wl,--gc-sections
CPPFLAGS = -I$(OUT) -P -MD -MT $@
# Default targets
target-y := $(OUT)canboot.elf
all:
# Run with "make V=1" to see the actual compile commands
ifdef V
Q=
else
Q=@
MAKEFLAGS += --no-print-directory
endif
# Include board specific makefile
include src/Makefile
-include src/$(patsubst "%",%,$(CONFIG_BOARD_DIRECTORY))/Makefile
################ Main build rules
$(OUT)%.o: %.c $(OUT)autoconf.h
@echo " Compiling $@"
$(Q)$(CC) $(CFLAGS) -c $< -o $@
$(OUT)%.ld: %.lds.S $(OUT)autoconf.h
@echo " Preprocessing $@"
$(Q)$(CPP) -I$(OUT) -P -MD -MT $@ $< -o $@
$(OUT)canboot.elf: $(OBJS_canboot.elf)
@echo " Linking $@"
$(Q)$(CC) $(OBJS_canboot.elf) $(CFLAGS_canboot.elf) -o $@
$(Q)scripts/check-gcc.sh $@ $(OUT)compile_time_request.o
################ Compile time requests
$(OUT)%.o.ctr: $(OUT)%.o
$(Q)$(OBJCOPY) -j '.compile_time_request' -O binary $^ $@
$(OUT)compile_time_request.o: $(patsubst %.c, $(OUT)src/%.o.ctr,$(src-y)) ./scripts/buildcommands.py
@echo " Building $@"
$(Q)cat $(patsubst %.c, $(OUT)src/%.o.ctr,$(src-y)) | tr -s '\0' '\n' > $(OUT)compile_time_request.txt
$(Q)$(PYTHON) ./scripts/buildcommands.py $(OUT)compile_time_request.txt $(OUT)compile_time_request.c
$(Q)$(CC) $(CFLAGS) -c $(OUT)compile_time_request.c -o $@
################ Auto generation of "board/" include file link
create-board-link:
@echo " Creating symbolic link $(OUT)board"
$(Q)mkdir -p $(addprefix $(OUT), $(dirs-y))
$(Q)rm -f $(OUT)*.d $(patsubst %,$(OUT)%/*.d,$(dirs-y))
$(Q)rm -f $(OUT)board
$(Q)ln -sf $(CURDIR)/src/$(CONFIG_BOARD_DIRECTORY) $(OUT)board
$(Q)mkdir -p $(OUT)board-generic
$(Q)rm -f $(OUT)board-generic/board
$(Q)ln -sf $(CURDIR)/src/generic $(OUT)board-generic/board
# Hack to rebuild OUT directory and reload make dependencies on Kconfig change
$(OUT)board-link: $(KCONFIG_CONFIG)
$(Q)mkdir -p $(OUT)
$(Q)echo "# Makefile board-link rule" > $@
$(Q)$(MAKE) create-board-link
include $(OUT)board-link
################ Kconfig rules
$(OUT)autoconf.h: $(KCONFIG_CONFIG)
@echo " Building $@"
$(Q)mkdir -p $(OUT)
$(Q) KCONFIG_AUTOHEADER=$@ $(PYTHON) lib/kconfiglib/genconfig.py src/Kconfig
$(KCONFIG_CONFIG) olddefconfig: src/Kconfig
$(Q)$(PYTHON) lib/kconfiglib/olddefconfig.py src/Kconfig
menuconfig:
$(Q)$(PYTHON) lib/kconfiglib/menuconfig.py src/Kconfig
################ Generic rules
# Make definitions
.PHONY : all clean distclean olddefconfig menuconfig create-board-link FORCE
.DELETE_ON_ERROR:
all: $(target-y)
clean:
$(Q)rm -rf $(OUT)
distclean: clean
$(Q)rm -f .config .config.old
-include $(OUT)*.d $(patsubst %,$(OUT)%/*.d,$(dirs-y))