The current code would define ruby_qsort as a wrapper of qsort_s when it is available. When both qsort_s and POSIX (GNU) qsort_r are available, we should call qsort_r directly instead, and the qsort_s wrapper is redundant.
[Bug #18997] Don't define ruby_qsort when POSIX qsort_r is available
The current code would define ruby_qsort as a wrapper of qsort_s
when it is available. When both qsort_s and POSIX (GNU) qsort_r
are available, we should call qsort_r directly instead, and
the qsort_s wrapper is redundant.