I also had an idea some time ago somehow related to what you are saying. I used to compile the kernel several times with different configurations, so every time I compile it, I wanted to know how long will it take beforehand. So I think about compiling a small program as a reference, and then use that time to estimate the compile time of the kernel files. But that sounds really complicated, because of the different variables that are related to compilation time, such as system load, memory usage, filesize and any other activities that the makefile does. So, a more simple aproach would be compile the kernel once, and then compile it again. The second time you will have knowledge of how long it takes to compile the whole thing, and so knowing which percentage you're compiling you could know how long will it take. But again, as you say, every time the kernel change you will have to modify this tool. I don't know, it seems very hard to get it done. Maybe I haven't think it that well. Hope I haven' t disturbed your thread.
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