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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wzero-as-null-pointer-constant warns when using `operator<=>`"
href="https://bugs.llvm.org/show_bug.cgi?id=44325">44325</a>
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<th>Summary</th>
<td>Wzero-as-null-pointer-constant warns when using `operator<=>`
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david@doublewise.net
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>```
#include <compare>
auto b = 1 <=> 2 < 0;
```
Outputs:
```
<source>:3:20: warning: zero as null pointer constant
[-Wzero-as-null-pointer-constant]
auto b = 1 <=> 2 < 0;
^
nullptr
1 warning generated.
Compiler returned: 0
```
See it live: <a href="https://godbolt.org/z/9a8cnD">https://godbolt.org/z/9a8cnD</a>
Technically, the warning is accurate. User code has a literal `0` that is being
passed to a function accepting a `nullptr`. However, this is an implementation
detail of the standard library and the intended interface for use (users should
not use `nullptr` there), so we should not warn users for doing so (and
definitely should not direct them to change their code).</pre>
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