[llvm-bugs] [Bug 45982] New: Device friend function is not seen in different file

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https://bugs.llvm.org/show_bug.cgi?id=45982

            Bug ID: 45982
           Summary: Device friend function is not seen in different file
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: CUDA
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nikolay_nechaev at mail.ru
                CC: llvm-bugs at lists.llvm.org

Created attachment 23505
  --> https://bugs.llvm.org/attachment.cgi?id=23505&action=edit
The archive containing files being compiled

I figure out it's a bug because `nvcc` compiles this without issues, but
`clang` gives a compilation error


I have got the `MyClass` class described at MyClass.cu, MyClass.cuh files.
There is a friend function declared in .cuh and defined in .cu file. The header
is included to main.cu, the project is compiled with both cu files.


Compilation commands are `nvcc main.cu MyClass.cu` and `clang++-10
--cuda-gpu-arch=sm_30 -L/usr/local/cuda/lib64 -lcudart_static -ldl -lrt
-pthread main.cu MyClass.cu`


Expected behaviour (like `nvcc`)
No output is produced, an executable is created


Actual behaviour (`clang`'s)
Getting compilation error:
```
main.cu:8:5: error: use of undeclared identifier 'init'
    init<<<1, 1>>>(&obj);
    ^
1 error generated when compiling for sm_30.
```

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