clearmake和gnu make都可以检测出来target之间的循环依赖

最新推荐文章于 2024-12-25 13:52:29 发布

lantianjialiang

最新推荐文章于 2024-12-25 13:52:29 发布

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本文通过实例演示了Makefile中定义和执行清洁(clean)目标的过程。包括如何通过make命令调用清洁目标，解决循环依赖警告，并展示Makefile中变量与目标的定义方式。

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[jialiang@ht191w tmp]$ make -f mk clean # gnu make
make: Circular target <- clean dependency dropped.
echo "clean is called"
clean is called
echo "clean running"
clean running
echo "current dir is: "
current dir is:
pwd
/home/jialiang/tmp
[jialiang@ht191w tmp]$ cmake -f mk clean # clearmake
clearmake: Warning: Cycle in dependency graph?
clearmake: Warning: "clean" was already seen.
        echo "clean is called"
clean is called

        echo "clean running"
clean running
        echo "current dir is: "
current dir is:
        pwd
/home/jialiang/tmp

[jialiang@ht191w tmp]$ cat mk
# Marco/Variable define
a = "great"

# Target/Dependency define
all:
        echo "great"

.PHONY: clean
clean: target
        echo "clean running"
ifeq ($(a), great)
        echo "equals"
endif

ifneq ($(a), dd)
        echo "current dir is: "
        pwd
endif

target: clean
        echo "clean is called"

# this line is useless, unless you put it the first line when you start define target
default: clean