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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong size of arrays with over-aligned elements"
href="https://bugs.llvm.org/show_bug.cgi?id=48787">48787</a>
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<th>Summary</th>
<td>Wrong size of arrays with over-aligned elements
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
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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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ju.orth@gmail.com
</td>
</tr>
<tr>
<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>
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<pre>Consider
__declspec(align(8)) typedef int Int[3];
struct Y {
Int y[3];
int i;
};
int f(void) {
return sizeof(struct Y);
}
msvc returns 40, clang returns 48 for the x86_64-pc-windows-msvc target.
Presumably because [1] rounds up the size to the alignment.
[1]
<a href="https://github.com/llvm/llvm-project/blob/689aaba7acf5778bfe96bfd7bc4f1f3ceed20dc8/clang/lib/AST/ASTContext.cpp#L1926-L1928">https://github.com/llvm/llvm-project/blob/689aaba7acf5778bfe96bfd7bc4f1f3ceed20dc8/clang/lib/AST/ASTContext.cpp#L1926-L1928</a></pre>
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