CC ?= clang CFLAGS = -O0 -g -Wall -Wextra .PHONY: all all: day_1 clean: rm -rf *.o rm -rf day_1 %.o: %.c $(CC) $(CFLAGS) -c -o $@ $< day_1: day_1.o $(CC) -o $@ $^ ./day_1 day_1.in