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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing warning due to uninitialized value because of construction order"
href="https://bugs.llvm.org/show_bug.cgi?id=52469">52469</a>
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<th>Summary</th>
<td>Missing warning due to uninitialized value because of construction order
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>13.0
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<th>Hardware</th>
<td>PC
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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>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>veluca@google.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The following piece of code does not generate a warning in clang 3.6+. It does
generate a warning in 3.5.2 (at least according to <a href="https://godbolt.org/">https://godbolt.org/</a>), as
well as on GCC.
struct S {
S(int& c): a(c) {}
int* b = &a;
int& a;
};
int f() {
int x = 5;
S s(x);
return *s.b;
}
Moreover (and this may be an unrelated bug, or intentional), as of clang 13,
this code produces an empty function, while on clang 12 and earlier it produced
a single `ud2` instruction.</pre>
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