<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - static constexpr symbol removed in offload when using -O1"
href="https://bugs.llvm.org/show_bug.cgi?id=51976">51976</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>static constexpr symbol removed in offload when using -O1
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gcgt96@durham.ac.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hi,
We use llvm13-rc3 with cuda10.1.243 for OMP offloading on x86 and power9.
We noticed that when turning on optimisation (-O1 and higher), symbols are
lost, leading to program errors of the kind
Target CUDA RTL --> Loading global /bar/ failed"
Our code looks like this:
class foo
{
public:
#pragma omp declare target
static constexpr int bar = 42;
#pragma omp end declare target
};
Johannes Doerfert pointed out that we can do
class foo
{
public:
#pragma omp declare target
static constexpr int bar = 42;
static const int * _keepalive_bar;
#pragma omp end declare target
};
and use this in the implementation:
const int *foo::_keepalive_bar = &foo::bar;
While I can confirm that this indeed works, it would be nice not having to do
that.
Thanks a lot,
Holger</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>