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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-cl encodes signed arbitrary precision integers incorrectly."
href="https://bugs.llvm.org/show_bug.cgi?id=39618">39618</a>
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<th>Summary</th>
<td>clang-cl encodes signed arbitrary precision integers incorrectly.
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>DebugInfo
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>zturner@google.com
</td>
</tr>
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<th>CC</th>
<td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org, mosescu@google.com, rnk@google.com
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<p>
<div>
<pre>enum SmallSignedEnum : char {
SSE_A = 0,
SSE_B = 100,
SSE_C = -100,
};
SmallSignedEnum GlobalEnumA = SSE_A;
SmallSignedEnum GlobalEnumB = SSE_B;
SmallSignedEnum GlobalEnumC = SSE_C;
int main(int argc, char **argv) {
return GlobalEnumA + GlobalEnumB + GlobalEnumC;
}
Compile with clang-cl and MSVC, and compare the results of dumping the
LF_ENUMERATE field list members. For SSE_C, with clang-cl llvm-pdbutil outputs
this:
- LF_ENUMERATE [SSE_C = 18446744073709551516]
Whereas with cl, llvm-pdbutil outputs this:
- LF_ENUMERATE [SSE_C = -100]
I suspect that clang's version is equivalent to -100 mod 2^64, but we should
really be emitting the exact same byte sequence as cl, and we clearly aren't.</pre>
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</p>
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