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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Three way comparator complains "zero as null pointer constant""
href="https://bugs.llvm.org/show_bug.cgi?id=46803">46803</a>
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<th>Summary</th>
<td>Three way comparator complains "zero as null pointer constant"
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</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++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>gumby@henkel-wallace.org
</td>
</tr>
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<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>Bug in clang++10.0.1 libc++ installed via apt-get from your repo.
Identical on MacOS 10.15 with homebrew clang++10
Or Godbolt.
Compile following program doing `clang++-10 -std=c++20
-Wzero-as-null-pointer-constant`
#include <iostream>
#include <compare>
int main () {
bool result { (1 <=> 2) < 0 };
std::cout << (result ? "Yes" : "No") << std::endl;
}
produces the error:
foo.cc:5:27: warning: zero as null pointer constant
[-Wzero-as-null-pointer-constant]
Also compiler-synthesized comparisons will generate this which is especially
confusing as they can happen when calling a library function that needs the '<'
operator.</pre>
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