3.17 regression: building with cwd outside of source root fails

From: Daniel Peebles
Date: Tue Aug 26 2014 - 21:36:10 EST

I'm a kernel newbie so I feel a bit out of place here, but I wanted to
draw attention to this bug I filed:
https://bugzilla.kernel.org/show_bug.cgi?id=83251. It fails in both
3.17-rc1 and -rc2, and the same workflow worked fine with 3.16.

I *think* the problem was introduced by the new references to $PWD in
the makefiles in commit 00a2430ff07d4e0e0e7e24e02fd8adede333b797
for the lazy), since my working directory isn't the main source tree.
Then again, it looks like there were already some mentions of $PWD
before that commit, so I'm not too sure.

Anyway, I'd appreciate feedback and/or hints for how to better
diagnose this or advice as to what the correct fix is.

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