Public bug reported:
The following program fails to compile, even with `g++ --std=c++17
test.cpp`.
```
#include <cmath>
#include <stdio.h>
int main()
{
printf("%f\n", std::cosf(0.0f));
}
```
`std::cosf` is required by the c++ standard. Draft N4659, page 1140.
g++ version is 8.3.0-6ubuntu1
ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: libstdc++-8-dev 8.3.0-6ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-15.16-generic 5.0.6
Uname: Linux 5.0.0-15-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 2 15:05:25 2019
InstallationDate: Installed on 2019-06-01 (0 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gcc-8
UpgradeStatus: Upgraded to disco on 2019-06-01 (0 days ago)
** Affects: gcc-8 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug disco
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https://bugs.launchpad.net/bugs/1831385
Title:
`std::cosf`, `std::sinf`, `std::sqrtf` are not declared in `<cmath>`
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