broken symlinks after updating from gnulib

[Eric Blake]

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I've noticed that after using either gnulib-tool (such as in m4 or
findutils) or bootstrap (in coreutils), when symlinks are used instead of
copies, that the deletion of a file in gnulib leaves a broken symlink in
the tree.  In the worst case, when a .m4 file is left dangling, it breaks
the autoreconf of the directory, because autoreconf refuses to proceed in
the face of a broken symlink.

For findutils, I recently added a patch to the import-gnulib.sh script to
call 'find -L -lname '*' -delete' after the fact (yes, this is GNU find
specific, but does the job of deleting all broken symlinks).  But it would
be better if gnulib-tool and bootstrap were taught to do this instead.

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

Eric Blake             address@hidden
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