See the port build failure due to this problem: http://beefy10.nyi.freebsd.org/data/112i386-default/500946/logs/moony-lv2-0.26.0.log
See also bug#175811
See also bug#216863
I think, this was overcome by events. (In reply to Yuri Victorovich from comment #2) Additionally, <https://github.com/freebsd/freebsd-src/commit/6813d08ff55ae587abd7e2297e051d491c218de0> (2018-07-15) is on branches: main release/13.2.0 release/12.0.0 6813d08ff55a msun: add ld80/ld128 powl, cpow, cpowf, cpowl from openbsd