https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70722 --- Comment #1 from Martin Thomson <martin.thomson at gmail dot com> --- My ViewCVS-fu isn't that good, it took me long enough to find this: https://gcc.gnu.org/viewcvs/gcc/trunk/libstdc%2B%2B-v3/include/c_global/cmath?r1=232585&r2=232586&