在父目录上编写具有前提条件的递归制作配方 [英] writing a recursive make recipe with prerequisite on parent directory

问题描述

我正在尝试编写一个递归的make配方.在此配方中，每个目标都依赖于在父目录上具有相同名称的文件.一个最小的(无效的)示例:

I am trying to write a recursive make recipe. In this recipe, each target is dependent on a file with an equal name on the parent directory. A minimal (non-working) example:

foo/.dirstamp:
  mkdir $(dir $@)
  touch $@

.SECONDEXPANSION:
%/.dirstamp: $$(dir $$*).dirstamp
  mkdir $(dir $@)
  touch $@

在此示例中，我希望make foo/bar/qux/lol/.dirstamp生成整个目录树(如果它不存在)，并一路触摸所有.dirstamp文件.但是，它不起作用:

With this example, I would expect make foo/bar/qux/lol/.dirstamp to generate the whole directory tree (if it does not exist), touching all .dirstamp files along the way. However, it does not work:

$ ls # note that there is nothing, make is meant to create the dir tree
Makefile
$ make --debug=v foo/bar/qux/lol/.dirstamp
GNU Make 4.0
[...]
Reading makefiles...
Reading makefile 'Makefile'...
Updating goal targets....
Considering target file 'foo/bar/qux/lol/.dirstamp'.
 File 'foo/bar/qux/lol/.dirstamp' does not exist.
 Finished prerequisites of target file 'foo/bar/qux/lol/.dirstamp'.
Must remake target 'foo/bar/qux/lol/.dirstamp'.
make: *** No rule to make target 'foo/bar/qux/lol/.dirstamp'.  Stop.

只要递归配方只需要扩展两次即可，例如make foo/bar/.dirstamp可以正常工作.

It works fine as long as the recursive recipe only needs to be expanded twice, e.g., make foo/bar/.dirstamp works fine.

如何在任意数量的级别上使用?如何处理目标名称和先决条件名称的递归扩展?

How can this work for an arbitrary number of levels? How can I handle a recursive expansion for the target and prerequisites names?

注意:我的真正问题是我的食谱的先决条件在根中 目录不同于目标目录，因此我使用上面的配方来复制目录树.我知道mkdir -p 在GNU系统中似乎工作正常.我仍然很想知道如何解决任意级别的递归问题.不再起作用，因为团队的一部分正在使用Mac并将该目录安装在smb上.

Note: my real problem is that the prerequisites of my recipes are in a root directory different from the target so I am using the recipe above to duplicate the directory tree. I know about mkdir -p which seems to work fine in GNU systems. I am still interested on knowing how I would solve the recursion problem for arbitrary levels. which no longer works because part of the team is using Mac and mounting this directories over smb.

有关实际问题的更多详细信息:先决条件在data/x/y/z中，而目标进入results/x/y/z中.但是，results目录树不存在，需要根据需要创建.为了解决这个问题，我将创建父目录作为仅顺序的先决条件(通过上面的最小示例中的.dirstamp文件).

More details on the actual problem: prerequisites are in data/x/y/z while targets go into results/x/y/z. However, the results directory tree does not exist and needs to be created as needed. To solve this, I made the creation of parent directories an order-only prerequisite (via the .dirstamp files on my minimal example above).

• 无法将data复制到results，这是几TB的数据；
• 无法在data中创建目标，这是只读的；
• 不能使用mkdir -p，因为results目录将不是本地目录，而是通过smb挂载，其他目录可能使用非GNU系统；

• can't copy data into results, that's several TB of data;
• can't have the targets created in data, that's read-only;
• can't use mkdir -p because the results directory will not be local, mounted over smb, and others may use non-GNU systems;

推荐答案

@EtanReisner对这个问题的提示后:

After an hint from @EtanReisner on the question:

make不会多次应用规则.这是一个内置的(有意的)限制.如果不通过手动递归或手动构建目标集并使用静态模式规则来解决(我不确定这可能会或可能不会实际工作)，那么您将无能为力.

make won't apply a rule more than once. That's a built-in (intentional) limitation. Without working around that with manual recursion or manually building the set of targets and using a static pattern rule (which may or may not actually work I'm not sure) there's not much you can do about this.

我制定了此解决方案:

RESULT_DIRS := $(patsubst data/%, results/%, $(shell find data/* -type d -print))
DIRSTAMPS := $(addsuffix /.dirstamp, $(RESULT_DIRS))

results/.dirstamp:
    mkdir $(dir $@)
    touch $@

.SECONDEXPANSION:
$(DIRSTAMPS): $$(dir $$(patsubst %/.dirstamp, %, $$@)).dirstamp
    mkdir $(dir $@)
    touch $@

它将复制results中的data目录树，因为需要dirstamp文件.通过使它们成为其他配方的先决条件(请注意|使其成为仅订购的先决条件)来实现它们:

It will duplicate the data directory tree in results as the dirstamp files are required. They are required by making them prerequisites of the other recipes (note the | which makes them order-only prerequisites):

results/%/foo.analysis: data/%/foo.data | results/%/.dirstamp
    $(SOME_ANALYSIS_PROGRAM) $^ > $@

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