[llvm-bugs] [Bug 48014] New: Using both -x cuda and -fopenmp complex wrappers block compilation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48014

            Bug ID: 48014
           Summary: Using both -x cuda and -fopenmp complex wrappers block
                    compilation
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: OpenMP
          Assignee: unassignedclangbugs at nondot.org
          Reporter: joachim at joameyer.de
                CC: llvm-bugs at lists.llvm.org

This is very related to Bug 45533.
If compiling with both -x cuda and -fopenmp (the latter to target CPU), a
number of errors similar to the following are emitted:

In file included from <built-in>:1:
In file included from
/home/joachim/Projekte/sycl/install/llvm11/lib/clang/11.0.0/include/__clang_cuda_runtime_wrapper.h:406:
/home/joachim/Projekte/sycl/install/llvm11/lib/clang/11.0.0/include/__clang_cuda_complex_builtins.h:76:7:
error: no matching function for call to '__nv_isnand'
  if (_ISNANd(__real__(z)) && _ISNANd(__imag__(z))) {
      ^~~~~~~
/home/joachim/Projekte/sycl/install/llvm11/lib/clang/11.0.0/include/__clang_cuda_complex_builtins.h:47:17:
note: expanded from macro '_ISNANd'
#define _ISNANd __nv_isnand
                ^~~~~~~~~~~
/home/joachim/Projekte/sycl/install/llvm11/lib/clang/11.0.0/include/__clang_cuda_libdevice_declares.h:226:16:
note: candidate function not viable: call to __device__ function from __host__
function
__DEVICE__ int __nv_isnand(double __a);

This is fixed in https://reviews.llvm.org/D90415 for master.
As this is the only missing piece to get the combination of -x cuda and
-fopenmp running with clang 11, I would suggest to backport the change to
release/11.x as well.

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