1. makefile命令前的 @ 符号作用：

加了@就不会显示命令本身，不加则相反。

test:
	@echo '123'
	
$ make test
123

-----------我是分隔符------------

test:
	echo '123'

$ make test
echo '123'
123
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2. 打印当前object名

test:
	@echo "object name is : $@"

$ make test
object name is : test
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3. PHONY伪目标的作用

参考：https://blog.csdn.net/tilblackout/article/details/114766598

4. Makefile中的$@, $^, $< , $?, $%, $+, $*

参考：https://blog.csdn.net/dlf1769/article/details/78997967/

5. Makefile中foreach使用

参考：https://blog.csdn.net/u012554768/article/details/46043193/

Makefile

Apps = aaa bbb ccc ddd eee fff

kkk: $(foreach App,$(Apps),test-$(App))

test-%:
	@echo "object name is : $@"
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$ make kkk
object name is : test-aaa
object name is : test-bbb
object name is : test-ccc
object name is : test-ddd
object name is : test-eee
object name is : test-fff
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