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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang should warn about memcmp of pointers to structs with padding"
href="http://llvm.org/bugs/show_bug.cgi?id=16942">16942</a>
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<th>Summary</th>
<td>clang should warn about memcmp of pointers to structs with padding
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>clattner@apple.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>This is almost always a bug:
#include <string.h>
struct foo {
char x; int y;
};
int test(struct foo *P, struct foo *Q) {
return memcmp(P, Q, sizeof(struct foo));
}
because the padding between the elements of the struct fields is being compared
as well. It would be nice for clang to warn on this. LLVM itself tripped over
this recently.</pre>
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