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[草稿]Makefile学习
source link: https://cndaqiang.github.io/2020/12/02/makefile/
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[草稿]Makefile学习
- 换行
\ - 注释用
# - 默认依赖
default: [label] - 系统命令前不加
@会把命令也输出到屏幕,加@不会输出到屏幕 - 变量以最终的定义为准
- 执行命令必须用Tab键，使用空格替换Tab会报错
*** missing separator. Stop.
default: main test
main:
@echo main $(OBJ)
OBJ= \
obj1 \
obj2
test:
@echo test $(OBJ)
OBJ = None
(python37) cndaqiang@mac makefile$ make
main None
test, None
OBJ= \
obj1 \
obj2
default: main
main:
@echo $(OBJ)
https://www.cnblogs.com/wanqieddy/archive/2011/09/21/2184257.html
= 是最基本的赋值
:= 是覆盖之前的值
?= 是如果没有被赋值过就赋予等号后面的值
+= 是添加等号后面的值
删除已有元素
https://cloud.tencent.com/developer/ask/62201
default: main
main:
@echo main $(OBJ)
OBJ= \
obj1 \
obj2
TMPVAR := $(OBJ)
OBJ = $(filter-out obj1, $(TMPVAR))
排序/删除重复元素
w = z z x x y c x 1 2 \
234
w += 1 2
cnq:
@echo $w
@echo $d
d=$(sort $(w))
(python37) cndaqiang@mac tmp$ make
z z x x y c x 1 2 234 1 2
1 2 234 c x y z
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