On Sat, 20 Feb 2010, Olaf Mersmann wrote:
Hello,
the included XZ Utils source code contains an incorrect use of the
restrict keyword. This leads to data corruption under certain
circumstances. For a short discussion of the problem see
http://sourceforge.net/projects/lzmautils/forums/forum/708858/topic/3306733
This was fixed in the XZ Utils git repository in commit
commit 49cfc8d392cf535f8dd10233225b1fc726fec9ef
Author: Lasse Collin <[email protected]>
Date: Tue Sep 15 21:07:23 2009 +0300
Fix incorrect use of "restrict".
Since then, there has not been a proper release of the XZ Utils so I
have applied said patch to the sources included in R and added a note
to the R_changes file in the src/extra/xz/ directory detailing the
changes.
This 'bug' is only triggered if the Intel C or gcc 4.4 is used to
compile R and the included liblzma is used instead of a system wide
one, so it might not be worth the trouble of patching the sources
instead of waiting for a new release. If anyone wants to apply a fix,
I have prepared a patch with all the changes which can be found here
http://www.statistik.tu-dortmund.de/~olafm/temp/xz_restrict.patch
We had been waiting for xz 5.000, but decided to go with 4.999
for R 2.10.0 as it was so long a-coming -- and are still waiting.
We do use the included sources on several platforms, and with gcc
4.4.4 on 64-bit Windows, so I will patch this, thank you.
Cheers,
Olaf Mersmann
--
Brian D. Ripley, [email protected]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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