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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -Waddress-of-packed member should not trigger inside typeof/decltype/sizeof"
href="https://bugs.llvm.org/show_bug.cgi?id=42862">42862</a>
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<th>Summary</th>
<td>-Waddress-of-packed member should not trigger inside typeof/decltype/sizeof
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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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
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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>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>arichardson.kde@gmail.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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<pre>I noticed that -Waddress-of-packed member triggers inside a typeof expression:
struct foo {
char c;
int member;
} __attribute__((packed));
int* good(struct foo* f) {
__typeof__(&(f->member)) ptr = 0;
return ptr;
}
int* bad(struct foo* f) {
return &f->member;
}
GCC compiles this code fine and only complains when actually taking the
address.
Example: <a href="https://godbolt.org/z/XMrchk">https://godbolt.org/z/XMrchk</a></pre>
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