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Re: Any known problems with relative paths in VPATH on Windows?

From: Eli Zaretskii
Subject: Re: Any known problems with relative paths in VPATH on Windows?
Date: Mon, 06 May 2013 19:22:50 +0300

> Date: Mon, 6 May 2013 15:45:43 +0200
> From: Erik Carstensen <address@hidden>
> I found the problem, there seems to be a limit in VPATH resolution of
> around 256 characters, where ..\ entries in the path are not collapsed. In
> my example, I ran make from c:\path\very-long-build-dir, and had
> ..\very-long-src-dir on VPATH; very-long-src-dir and very-long-build-dir
> were a bit over 200 characters together, so some but not all files in the
> src dir exceeded the length limit and were not found.
> I don't know where this limit comes from; if it's a Windows limitation,
> there's not much we can do. In my example it would have helped to collapse
> the ..\:s in VPATH before resolving files, but it would just move the
> problem a few characters. I have solved it myself in my use case, by
> printing a warning when detecting dangerously long paths. I'm not sure if
> it would make sense for make itself to automatically warn on too long paths.

I doubt that it has anything to do with Windows.

I'll look into this, but it would help if you could show a simple
example that can be used to reproduce this problem.


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