我有以下递归生成文件：
.PHONY: all clean
%.subdir:
$(MAKE) -C src $*
$(MAKE) -C dict $*
all: all.subdir
clean: clean.subdir
它工作正常：
$ make all
make -C src all
make[1]: Entering directory `/or-1.3.6-fix/src'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/or-1.3.6-fix/src'
make -C dict all
make[1]: Entering directory `/or-1.3.6-fix/dict'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/or-1.3.6-fix/dict'
但定义会更合乎逻辑%.subdir规则是假的：
.PHONY: all clean all.subdir clean.subdir
现在让停止工作如我所愿：
$ make all
make: Nothing to be done for `all'.
$ make -d all
...
Updating goal targets....
Considering target file `all'.
File `all' does not exist.
Considering target file `all.subdir'.
File `all.subdir' does not exist.
Finished prerequisites of target file `all.subdir'.
Must remake target `all.subdir'.
Successfully remade target file `all.subdir'.
Finished prerequisites of target file `all'.
Must remake target `all'.
Successfully remade target file `all'.
make: Nothing to be done for `all'.
有人可以解释一下为什么吗（或者更好地指出我制作文档）？
你是对的，将子目录规则定义为 PHONY 会更有意义。但是 Make 不考虑 PHONY 目标的隐式规则，因此您必须重写该规则。我建议如下：
SUBDIR_TARGETS = all.subdir clean.subdir
.PHONY: all clean $(SUBDIR_TARGETS)
$(SUBDIR_TARGETS): %.subdir:
$(MAKE) -C src $*
$(MAKE) -C dict $*
all: all.subdir
clean: clean.subdir
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