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<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Segfault when assigning value to a reference"
href="http://llvm.org/bugs/show_bug.cgi?id=15650">15650</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Segfault when assigning value to a reference
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.2
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vk@vedantk.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10271" name="attach_10271" title="clang++ backtrace">attachment 10271</a> <a href="attachment.cgi?id=10271&action=edit" title="clang++ backtrace">[details]</a></span>
clang++ backtrace
clang++ attempted to generate a diagnostic for me on the line;
/* Right hand side is of type Vector3f. */
Vector3f& normal = loc.second.normalized();
It segfaulted while doing that. The full trace is attached in the file
"trace.txt". Here are the last few frames;
0 libLLVM-3.2.so 0x00007f34d25f40bf
1 libLLVM-3.2.so 0x00007f34d25f4529
2 libpthread.so.0 0x00007f34d189c1e0
3 libLLVM-3.2.so 0x00007f34d25bbb75 llvm::APInt::countLeadingZerosSlowCase()
const + 37
4 libLLVM-3.2.so 0x00007f34d25bbd5d llvm::APInt::EqualSlowCase(llvm::APInt
const&) const + 253
5 clang 0x0000000000ec22b9
6 clang 0x0000000000ec3113
7 clang 0x0000000000ec4380
clang::FormatASTNodeDiagnosticArgument(clang::DiagnosticsEngine::ArgumentKind,
long, char const*, unsigned int, char const*, unsigned int,
std::pair<clang::DiagnosticsEngine::ArgumentKind, long> const*, unsigned int,
llvm::SmallVectorImpl<char>&, void*, llvm::ArrayRef<long>) + 240
8 clang 0x00000000010235fa clang::Diagnostic::FormatDiagnostic(char
const*, char const*, llvm::SmallVectorImpl<char>&) const + 2570
9 clang 0x0000000000638787
clang::TextDiagnosticPrinter::HandleDiagnostic(clang::DiagnosticsEngine::Level,
clang::Diagnostic const&) + 87
10 clang 0x0000000001027f20
clang::DiagnosticIDs::EmitDiag(clang::DiagnosticsEngine&,
clang::DiagnosticIDs::Level) const + 48
11 clang 0x0000000001028175
clang::DiagnosticIDs::ProcessDiag(clang::DiagnosticsEngine&) const + 389
12 clang 0x0000000001021d5c
clang::DiagnosticsEngine::EmitCurrentDiagnostic(bool) + 76
13 clang 0x000000000090133b
clang::Sema::EmitCurrentDiagnostic(unsigned int) + 683
clang++ was able to successfully compile the program when I removed the
reference from the left hand side;
Vector3f normal = loc.second.normalized();</pre>
</div>
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