[issue27229] In tree cross-build fails copying Include/graminit.h to itself

[Martin Panter]

Martin Panter added the comment:

I was a little concerned that Alex’s patch used “test A -ef B”, which is not specified by Posix. But it is apparently widely supported (and consider we would only need it for cross compilation). Anyway, I was going to suggest test "$(srcdir)" == "." instead, but maybe Xavier’s solution is slightly better again.

I say go with vpath.patch, perhaps with a brief comment explaining that the cp + mv dance avoids copying the file onto itself when doing an in-tree build.

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stage:  -> commit review
versions: +Python 2.7, Python 3.5

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<http://bugs.python.org/issue27229>
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