gnulib-tool --local-dir question

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I just modified M4 to use gnulib-tool --local-dir in order to upgrade M4
to GPLv3 (the version-etc module still prints GPLv2+ without a local
patch) [1].  However, I noticed that gnulib-tool currently requires that
.diff files be laid out in the same directory structure in the local dir
as they are in gnulib.  I was kind of hoping that, with few enough .diff
files, that I could lump them all directly inside the local dir, rather
than creating a directory structure just for a few patch files (sure, it
doesn't scale as well, but it takes less effort).  For an example, with
just gpl-3.0.texi.diff and version-etc.c.diff, the difference is between:

- --local-dir=local
local/lib/version-etc.c.diff
local/doc/gpl-3.0.texi.diff

or

- --local-dir=local
local/version-etc.c.diff
local/gpl-3.0.texi.diff

Is that worth pursuing?  At any rate, I either need a followup patch to m4
to put the .diff files in the correct location, or wait for a gnulib-tool
patch that can find the .diff files at either location; until then, m4
bootstrap doesn't quite pick up the GPLv3 local patch as intended.

[1]
http://www.nabble.com/branch---upgrade-to-GPLv3%2B-tf4027582.html#a11440548

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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