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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - incorrect sizeof for bitfield enum values"
href="https://bugs.llvm.org/show_bug.cgi?id=37979">37979</a>
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<th>Summary</th>
<td>incorrect sizeof for bitfield enum values
</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>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>sbc@chromium.org
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Looks like this was broken by <a href="https://reviews.llvm.org/rL335781">https://reviews.llvm.org/rL335781</a>
The following test case is derived from one of the GCC torture tests:
<a href="https://github.com/gcc-mirror/gcc/blob/master/gcc/testsuite/g%2B%2B.dg/conversion/bitfield1.C">https://github.com/gcc-mirror/gcc/blob/master/gcc/testsuite/g%2B%2B.dg/conversion/bitfield1.C</a>
$ cat test.cc
enum E { a, b = 1LL << 48 };
struct S {
E e : 3;
};
S s;
int main () {
static_assert(sizeof(E) == sizeof(long long));
static_assert(sizeof(s.e + 3) == sizeof(long long));
}
$ ./bin/clang++ --std=c++17 -c test.cc
test.cc:11:3: error: static_assert failed
static_assert(sizeof(s.e + 3) == sizeof(long long));
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.</pre>
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