1.@放在行首，表示不打印此行。默认在编译的过程中，会把此行的展开效果字符串打印出来。
2.make distclean
https://blog.csdn.net/qdujunjie/article/details/43918285
3.make与make all的区别
all : hello another
hello : hello.cpp
g++ -o $@ $<
another : another.cpp
g++ -o $@ $<
直接 make 或 make all 的话会执行 hello.cpp 和 another.cpp 的编译命令
后面不加参数的话，会把第一个目标作为默认的
make hello 的话只编译 hello.cpp
make another 的话只编译 another.cpp
https://blog.csdn.net/electrocrazy/article/details/79348357
https://blog.csdn.net/qing101hua/article/details/53228432
4.Makefile文件
https://www.cnblogs.com/lidabo/p/4521123.html
https://blog.csdn.net/dodonei/article/details/73928827
https://blog.csdn.net/lizhidefengzi/article/details/68960082
http://www.cnblogs.com/coderkian/p/3479564.html
https://www.cnblogs.com/Anker/p/3242207.html
https://www.cnblogs.com/bakoom/p/9697274.html
https://blog.csdn.net/u013774102/article/details/79043559
https://blog.csdn.net/weixin_38391755/article/details/80380786
https://www.cnblogs.com/wang_yb/p/3990952.html
5.$@ $^ %<的使用
https://blog.csdn.net/gmq_syy/article/details/73928782
https://blog.csdn.net/u013774102/article/details/79043559
6.make –C 跳转
https://blog.csdn.net/chinus_yan/article/details/8911049
7.cc –c
https://blog.csdn.net/sunxiaopengsun/article/details/79192192
8.makefile： 如何在.h文件更新之后，相应的.o文件能重新编译
https://blog.csdn.net/u010278579/article/details/52868789
9.all
http://blog.chinaunix.net/uid-28458801-id-3452277.html
https://blog.csdn.net/kooktao/article/details/78112419
10.=,:=区别
11.=取最终值，:=取当前值
https://www.cnblogs.com/wanqieddy/archive/2011/09/21/2184257.html
12.怎么获取makefile文件中定义的变量，或者说编译选项怎么与程序发生联系？
13.伪命令PHONY
https://www.cnblogs.com/hnrainll/archive/2011/04/12/2014082.html
https://www.cnblogs.com/samuelwnb/p/3895191.html
https://blog.csdn.net/gxlzyt123456/article/details/54965408
https://blog.csdn.net/derkampf/article/details/70256891
14.Makefile 与 shell脚本的区别
https://blog.csdn.net/gx19862005/article/details/40375909
https://blog.csdn.net/zengzhihao/article/details/79035319
https://blog.csdn.net/absurd/article/details/636418
15.make –j8 加快编译速度