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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -Wcast-align incorrectly warning on aligned type."
href="https://bugs.llvm.org/show_bug.cgi?id=46605">46605</a>
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<th>Summary</th>
<td>-Wcast-align incorrectly warning on aligned type.
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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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
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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>Frontend
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<th>Assignee</th>
<td>ahatanak@gmail.com
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<th>Reporter</th>
<td>jyknight@google.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>This seems to be a regression from 854f5f332af4640d9425e9a94442629e4f5a3f98
("[Sema] Teach -Wcast-align to compute an accurate alignment using the
alignment information on VarDecls in more cases.")
Running `clang -Wcast-align test.cc` on the following program:
```
class Foo {
long x;
};
struct Bar {
alignas(Foo) char buf[sizeof(Foo)];
Foo* getFoo() { return (Foo*)&buf; }
};
```
results in an incorrect warning, despite that "buf" is actually correctly
8-byte aligned:
test.cc:7:26: warning: cast from 'char (*)[8]' to 'Foo *' increases required
alignment from 1 to 8 [-Wcast-align]
Foo* getFoo() { return (Foo*)&buf; }
^~~~~~~~~~</pre>
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