https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67256
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- N.B. the functions happen to be declared in <bits/mathcalls.h> but they are standard functions declared in <math.h> and so your code would already have failed to compile in C++03 if anyone included <math.h> (and the same applies for <cmath> when that is implemented in terms of <math.h>, which is permitted by the text I quoted from the standard).
