Tools for debugging makefiles - tool for debugging makefiles

problem ：

I have a large legacy codebase with very complicated makefiles, with lots of variables. I have a large legacy code base , Contains very complex makefile, There are many variables .Sometimes I need to change them, and I find that it's very difficult to figure out why the change isn't working the way I expect. Sometimes I need to change them , I find it hard to figure out why the change doesn't work as I expected .What I'd like to find is a tool that basically does step-through-debugging of the "make" process, where I would give it a directory, and I would be able to see the value of different variables at different points in the process. What I want to find is a basically right “make” A tool for step-by-step debugging of the process , I'll give it a catalog , I will be able to see the values of different variables at different points . Handle .None of the debug flags to make seem to show me what I want, although it's possible that I'm missing something. No debug flags seem to tell me what I want , Although I may miss something .Does anyone know of a way to do this? Who knows how to do this ？

---

Solution ：

Reference resources ： https://stackoom.com/en/question/EF7