[llvm-bugs] [Bug 49683] New: CUDA static member variable initialization issue

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49683

            Bug ID: 49683
           Summary: CUDA static member variable initialization issue
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: CUDA
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kjain14 at utexas.edu
                CC: llvm-bugs at lists.llvm.org

Summary:

Currently, static member variables can be used in both host and device code.
However, it is not possible to initialize
both host and device copies of these static member variables.

Description:

Marking either the declaration or definition of the static member variable with
__device__ initializes the device copy
 with the value in the definition. Attempting to define the host copy results
in a redefinition error.

In the attached code, we define the device copy on line 10. The printf
statement in the kernel prints 3 and the printf 
statement in main prints 1.

If we comment out the device definition and leave the host definition, then the
printf statement in the kernel prints 1
and the printf statement in main prints 3. We also get a warning from ptxas: 

ptxas warning : Unresolved extern variable '_ZN2c02v0E' in whole program
compilation, ignoring extern qualifier

Is there any way to define the host and device copies to either the same or
different values?

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