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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Undefined Reference to static constexpr when compiling with -fprofile-instr-generate"
href="https://bugs.llvm.org/show_bug.cgi?id=51883">51883</a>
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<th>Summary</th>
<td>Undefined Reference to static constexpr when compiling with -fprofile-instr-generate
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++14
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>thoren.paulson@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Godbolt link: <a href="https://godbolt.org/z/vqEjKEKch">https://godbolt.org/z/vqEjKEKch</a>
When I compile the following code with `-Oz -std=c++14
-fprofile-instr-generate`, it refers to the undefined symbol kUndefined, which
causes "undefined reference" at link time.
```
#include <algorithm>
class Foo {
private:
static constexpr int kUndefined = 4;
public:
int Bar(int a);
};
int Foo::Bar(int a) {
return std::max(a, kUndefined);
}
```
It seems this is because std::max takes its arguments by reference, so if it
doesn't get inlined (consequence of -Oz), code is generated referring to
kUndefined, but there is no code generated to define kUndefined.</pre>
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