[llvm-bugs] [Bug 51639] New: Complex math functions not linking on nvptx

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https://bugs.llvm.org/show_bug.cgi?id=51639

            Bug ID: 51639
           Summary: Complex math functions not linking on nvptx
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: OpenMP
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pushpinderdhaliwal00 at gmail.com
                CC: johannes at jdoerfert.de, llvm-bugs at lists.llvm.org

I have been trying to use complex math functions in the openmp target
region. I am able to use basic complex arithmetic but math functions
like abs, sin do not work. I get a linker undefined error when I use
these methods. I noticed that these methods are defined in
openmp_wrappers/complex_cmath.h in the variant region in
https://github.com/llvm/llvm-project/blob/main/clang/lib/Headers/openmp_wrappers/complex#L47.
Am I missing something?

More details,
command line: clang++ test.cpp -fopenmp -fopenmp-targets=nvptx64-nvidia-cuda
test.cpp:
#include <iostream>
#include <complex>
#include <cmath>

int main() {
  std::complex<double> x, a, b;
#pragma omp target map(tofrom: x)
  {
    x = std::exp(a * b);
  }

  std::cout << x << std::endl;
  return 0;
}

linker error: nvlink error   : Undefined reference to 'cexp' in
'/tmp/test-a02307.cubin'
CUDA details:
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2020 NVIDIA Corporation
Built on Tue_Sep_15_19:10:02_PDT_2020
Cuda compilation tools, release 11.1, V11.1.74
Build cuda_11.1.TC455_06.29069683_0

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