#811 std::sqrtf, std::sqrtl not supported

[Old Wolf 2]

Sample code:

#include <cmath>
auto x = std::sqrtf(1.0f);

Compilation command: g++ -std=c++17 foo.c

Gives error error: 'sqrtf' is not a member of 'std'

Version: g++.exe (Rev2, Built by MSYS2 project) 8.3.0

It works to use ::sqrtf, and also works to use std::sqrt (which chooses the correct overload). But the C++ Standard section [cmath.syn] requires that including <cmath> makes std::sqrtf available.

The same problem exists for std::sqrtl, std::powf, std::powl, std::ceilf and std::ceill at least. (After spotting the problem with sqrtl I tried a few other functions and saw the same issues -- this is not an exhaustive list).

[Doug Semler]

This is a bug in libstdc++ (it also exists on linux gcc), and not the runtime.
This issue has actually been known since 2017:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89279