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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - static constexpr floating member incorrectly identified as odr-used"
href="http://llvm.org/bugs/show_bug.cgi?id=22565">22565</a>
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<th>Summary</th>
<td>static constexpr floating member incorrectly identified as odr-used
</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>All
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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>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>yaghmour.shafik@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Given the following code from stackoverflow question
<a href="http://stackoverflow.com/q/28264279/1708801">http://stackoverflow.com/q/28264279/1708801</a> :
struct Blob {
static constexpr double a = 10;
};
int main() {
Blob b;
auto c = b.a;
}
Does not link and produces the following error:
prog.cc:(.text+0xb): undefined reference to `Blob::a' clang: error: linker
command failed with exit code 1 (use -v to see invocation)
Here is a online live version:
<a href="http://melpon.org/wandbox/permlink/JRphxTSHekwqEd6p">http://melpon.org/wandbox/permlink/JRphxTSHekwqEd6p</a>
This looks like an odr-use issue since adding an out of class definition fixes
the issue:
constexpr double Blob::a ;
As far as I can tell a is not odr-used and so this should be valid code without
the out of class definition.
Note, using qualified id to access the member works though:
auto c = Blob::a;
Also, using any level of optimization(-O1 etc...) also makes the problem go
away.</pre>
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