如何处理Makefile中动态检测到的未知依赖项? [英] How to handle unknown dependencies in Makefile that are dynamically detected?
问题描述
比方说我的Makefile正在建立一个网站.我写了一个包含资产的index.html，如下所示:
Let's say my Makefile is building a website. I write a index.html containing assets, like this:
<html>
<body><img src="asset/foo.img"/></body>
</html>
现在，我想编写一条规则来创建一个包含HTML及其资产的ZIP归档文件.
Now I want to write a rule to create a ZIP archive that contains the HTML as well as its assets.
我编写了一个脚本来解析src=属性，但是该如何处理?
如果我将其放在配方中，但那时不能更改Makefile规则.
如果我将其放在$(shell ...)命令中，那么即使用户正在执行clean之类的命令，它也必须在每次Makefile解析时运行.
I write a script to parse out the src= attributes, but what do I do with it?
If I put that in a recipe, but at that point the Makefile rules can't be changed.
If I put it in a $(shell ...) command, then it will have to run every time the Makefile is parsed, even if the user is doing a clean or something.
处理这种情况的正确方法是什么?
What is the proper way to handle such a scenario?
推荐答案
实际上，我认为自己已经知道了.解决方案是对$(MAKE)的子调用-实际上，与include相比，它的主要区别似乎是它在配方执行时而不是在解析时发生.
Actually I think I just figured it out myself. The solution is a sub-call to $(MAKE)—in fact, its primary difference compared to include seems to be the fact that it occurs at recipe execution time rather than at parse time.
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