include conf.mk

.PHONY:all dirs clean am_i_root help

DIRS=\
$(OBJ_DIR) \
$(MODULES_DIR) \
$(CPIO_DIR)/dev

OBJS=\
$(OBJ_DIR)/init.o \
$(OBJ_DIR)/modules.o

ifdef DEBUG
ULINUX_DEBUG_OBJS=\
$(OBJ_DIR)/mem.o \
$(OBJ_DIR)/string.o \
$(OBJ_DIR)/vsprintf.o

OBJS+= $(ULINUX_DEBUG_OBJS)
endif

help:
	@echo "targets are 'all', 'help'(this output), 'clean'"
	@echo -e "you can configure the build with the following variables:\\n\
	SYSROOT, KERNEL_VERSION, ARCH, MODULES, SCSI_WAIT, CC, LD, CFLAGS, LDFLAGS\\n\
	(you can tune the conf.mk file)"

all:am_i_root dirs ulinux/arch $(BUILD_DIR)/initramfs.cpio.xz

am_i_root:
	@if [ $$(whoami) != root ];then echo *ERROR* must be root to build;false;fi

dirs:$(DIRS)
$(DIRS):
	-mkdir -p $@

ulinux/arch:
	ln -s archs/$(ARCH) ulinux/arch

#===============================================================================
ifdef DEBUG
$(OBJ_DIR)/mem.o:ulinux/arch/utils/mem.c
	$(CC) $(CFLAGS) -c $< -o $@

$(OBJ_DIR)/string.o:ulinux/utils/ascii/string/string.c
	$(CC) $(CFLAGS) -c $< -o $@

$(OBJ_DIR)/vsprintf.o:ulinux/utils/ascii/string/vsprintf.c
	$(CC) $(CFLAGS) -c $< -o $@
endif
#===============================================================================

$(CPIO_DIR)/dev/console:
	mknod --mode=0600 $(CPIO_DIR)/dev/console c 5 1

$(BUILD_DIR)/initramfs.cpio:$(CPIO_DIR)/init $(CPIO_DIR)/dev/console
	chown -R 0:0 $(CPIO_DIR)
	DEST_FILE=$$(realpath $(BUILD_DIR))/initramfs.cpio;\
	cd $(CPIO_DIR);\
	find . -depth -print | cpio --format=newc --create >$${DEST_FILE}

$(BUILD_DIR)/initramfs.cpio.xz:$(BUILD_DIR)/initramfs.cpio
	xz --force --check=crc32 --extreme $<

$(OBJ_DIR)/modules.o:modules.c modules_list.h
	$(CC) $(CFLAGS) -c $< -o $@
 	
$(OBJ_DIR)/init.o:init.c modules.h
	$(CC) $(CFLAGS) -c $< -o $@
	
$(CPIO_DIR)/init:$(OBJS)
	$(LD) $(LDFLAGS) $(OBJS) --output $@

modules_list.h:
	./script/modules_list.sh >$@
	
clean:
	-rm -f ulinux/arch
	-rm -Rf $(BUILD_DIR)
	-rm -f modules_list.h