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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - CUDA static member variable initialization issue"
href="https://bugs.llvm.org/show_bug.cgi?id=49683">49683</a>
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<th>Summary</th>
<td>CUDA static member variable initialization issue
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>CUDA
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>kjain14@utexas.edu
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>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?</pre>
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