Fish Touching🐟🎣

makefile

Nov 3, 2023

target ... : prerequisites ...
    command

prerequisites 中如果有一个以上的文件比 target 文件要新的话，command 所定义的命令就会被执行。

# 变量

:= append
= recursive find

objects = main.o kbd.o command.o display.o \
     insert.o search.o files.o utils.o

edit : $(objects)
    cc -o edit $(objects)

# 自动推导

.o 文件自动知道编译命令

objects = main.o kbd.o command.o display.o \
    insert.o search.o files.o utils.o

aout : $(objects)
    cc -o aout $(objects)

main.o : defs.h
kbd.o : defs.h command.h
command.o : defs.h command.h
display.o : defs.h buffer.h
insert.o : defs.h buffer.h
search.o : defs.h buffer.h
files.o : defs.h buffer.h command.h
utils.o : defs.h

.PHONY : clean
clean :
    -rm edit $(objects)

# Make Clean

.PHONY : clean
clean :
    -rm edit $(objects)

# phony

A phony target is one that is not the name of a file; rather it is just a name for a recipe to be executed when you make an explicit request.
- 表示出错继续运行

# Variable

# Static Pattern Rule

objects = foo.o bar.o all.o
all: $(objects)

# These files compile via implicit rules
# Syntax - targets ...: target-pattern: prereq-patterns ...
# In the case of the first target, foo.o, the target-pattern matches foo.o and sets the "stem" to be "foo".
# It then replaces the '%' in prereq-patterns with that stem
$(objects): %.o: %.c

all.c:
	echo "int main() { return 0; }" > all.c

%.c:
	touch $@

clean:
	rm -f *.c *.o all