2008-09-19  Johannes Singler  <singler@ira.uka.de>

        PR libstdc++/37470
        * include/parallel/base.h: Rename log2 to __log2.
          (__log2) Avoid infinite loop for n <= 0, return 0.
        * include/parallel/losertree.h: Rename log2 to __log2.
        * include/parallel/multiseq_selection.h: Likewise.
        * include/parallel/random_shuffle.h: Likewise.

From-SVN: r140490