Makefile.in

CC = riscv64-linux-gnu-gcc
CFLAGS = -O1 \
	-fno-ipa-pure-const  \
	-fno-inline-functions-called-once \
	-fno-stack-protector \
	-Wall -Werror -march=rv64g

DIRS = $(shell ls -l| grep -v build | grep ^d |awk '{print $$9}')
TARGET_DEST = $(addprefix build/,$(DIRS))
FILES = $(basename $(notdir $(shell find . -maxdepth 1 -name "*.c")))
TARGET_FILE = $(addprefix build/,$(FILES))
TARGET = $(notdir $(shell pwd))

$(shell touch $(DIRS) .)

all: $(TARGET_FILE) $(TARGET_DEST)
	@echo $(FILES)
	@echo $(DIRS)

$(TARGET_FILE) : %:%.o
	@mkdir -p build
	@$(CC) $(CFLAGS) $^ -o $@

%.o: %.s
	@$(CC) $(CFLAGS) $^ -c -o $@

build/%.s: %.c
	@mkdir -p build
	@$(CC) $(CFLAGS) $^ -S -o $@

$(TARGET_DEST) : build/%: %
	@mkdir -p build
	@echo "include ../../Makefile-dir.in" > $^/Makefile
	@mkdir -p $^/build
	-@make -C $^ TARGET=../$@
	@rm $^/Makefile

.NOTINTERMEDIATE: $(TARGET_FILE:%=%.s)