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As reported in http://gcc.gnu.org/PR46863, memmove (and apparently wmemmove too) have incorrect __restrict qualifiers, eventhough their arguments may overlap.

memmove has been fixed in git already (though, the git commit apparently also includes an unrelated hunk in some *.S file), wmemmove/wmemset fix has just been posted.

This should be backported for RHEL 6.1.

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The memmove, wmemmove and wmemset operations contained incorrect "__restrict" qualifiers, even though their arguments could overlap. This issue has now been corrected.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0584.html