在GNU中保留先决条件的尾部斜杠使3.81

/ 似乎不可能,但也许 bar/. 会帮助你吗?它将需要重写所有目录目标,以包括尾随的 /.

_empty :=
_space := $(_empty) $(_empty)

.PHONY: bar bar/.
bar bar/.:
       @echo "$@ -> $(dir $@)"

foo: bar/

foo_quoted: "bar/ "

foo_space: bar/$(_space)

foo_space_quoted: "bar/$(_space)"

BAR = "bar/ "

foo_var: $(BAR)

BAR_DIR = bar/

foo_dir: $(dir $(BAR_DIR))

BAR_SPACE = bar/$(_space)

foo_var_space: $(BAR_SPACE)

foo_dot: bar/.

foo_double: bar//

bar ,也就是说,GNU会将尾随剥离 foo_dot 另一方面,示例的结果是

$ ./make --version
GNU Make 3.81
...
$ ./make foo_dot
bar/. -> bar/

$ make --version
GNU Make 4.2.1
...
$ make foo_dot
bar/. -> bar/