8. get directory function / get file function -dir / -notdir

1. Take the directory function —dir.

$(dir <names...>)

1.1 Introduce

$(dir <names...>)
 name ： Take the directory function ——dir.
 function ： From the file name sequence <names> Take out the table of contents . The directory section refers to the last backslash （“/”） Before 
 Part of . If there is no backslash , Then the return “./”.
 return ： Return the file name sequence <names> The table of Contents section of .

1.2 Example

all:
	$(dir dir/dir_test.c filename)
# dir/ ./

2. Take file function —notdir

2.1 Introduce

$(notdir <names...>)
 name ： Take file function ——notdir.
 function ： From the file name sequence <names> Take out the non directory part of . The non directory part refers to the last backslash （“ /”）
 The next part .
 return ： Return the file name sequence <names> The non catalog part of .

2.2 Example

$(notdir dir/dir_test.c filename)
# The return value is “dir_test.c filename”