A previous fix to a performance problem in std::sort unfortunately has lead to a crashing bug in std::nth_element.
The following minimal patch fixes the problem (there are a couple of different ways of fixing it, this is the shortest and safest). 2013-09-19 Chris Jefferson <ch...@bubblescope.net> PR libstdc++/58800 * include/bits/stl_algo.h (__unguarded_partition_pivot) : Change __last - 2 to __last - 1, so we correctly work on arrays of length 4. * testsuite/25_algorithms/nth_element/58800.cc : New
nth_element1.patch
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