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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Can't have OpenMP enabled while compiling CUDA (even without any OpenMP constructs)"
href="https://llvm.org/bugs/show_bug.cgi?id=28723">28723</a>
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<th>Summary</th>
<td>Can't have OpenMP enabled while compiling CUDA (even without any OpenMP constructs)
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>CUDA
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>poliakoff1@llnl.gov
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Please excuse if this is in the wrong tracker, it might need to be in the CUDA
or OpenMP section (in fact, I'll file an issue there as well)
I have a file without any OpenMP in it, and if I try
clang++ [cuda args] -x cuda -std=c++11 --cuda-gpu-arch=sm_30 -stdlib=libc++
b.cpp
it is successful. If on the other hand I try
clang++ [cuda args] -x cuda -std=c++11 --cuda-gpu-arch=sm_30 -stdlib=libc++
-fopenmp b.cpp
I get
error: The target 'nvptx64-nvidia-cuda' is not a supported OpenMP host target.
It appears that Clang only sees that I am using a CUDA backend and am using the
OpenMP flag, not checking whether any OpenMP code actually needs to go to the
PTX backend. Much like the Sandia folks, we're writing portable parallel
programming models and would really love to put Clang through its paces, but if
we can't write code where CUDA sections follow OpenMP ones, we won't be able
to.</pre>
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</p>
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