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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - False positive on calling new(std::size_t, std::align_val_t)"
href="https://bugs.llvm.org/show_bug.cgi?id=44693">44693</a>
</td>
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<th>Summary</th>
<td>False positive on calling new(std::size_t, std::align_val_t)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dcoughlin@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cassio.neri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider:
struct X {
alignas(32) char c;
};
int main() {
X* p = new X; // #1
delete p;
}
compiled with
scan-build clang++ -g -std=c++17 main.cpp
yields warning: Function taking 2 arguments is called with fewer (1)
X* p = new X;"
^~~~~
Since X is an over-aligned type, in C++17 the new expression in #1 makes the
compiler to call operator new(std::size_t, std::align_val_t). It seems the
static analyzer believes the compiler behaves as per C++14 and makes a call to
new(std::size_t).
At least the warning could output a more informative message mentioning
over-alignment.</pre>
</div>
</p>
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