[llvm-bugs] [Bug 47662] New: libcxx, `std::sqrt(std::complex<int>(2))` doesn't compile

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47662

            Bug ID: 47662
           Summary: libcxx, `std::sqrt(std::complex<int>(2))` doesn't
                    compile
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jdoerfert at anl.gov
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com,
                    xw111luoye at gmail.com

The complex header in libcxx (and its copy for use in OpenMP target regions) do
not properly call `polar` for complex integers. While this can be resolved by
explicit instantiation of polar, my initial experiments suggested this will not
match the expected outcome.

Minimal reproducer: https://godbolt.org/z/jWGzj7
```
#include <complex>
#include <cmath>

std::complex<int> foo () {
   return std::sqrt(std::complex<int>(2));
}
```

Found as part of PR47655.

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