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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dangling StringRef in clang/lib/Driver/ToolChains.cpp"
href="http://llvm.org/bugs/show_bug.cgi?id=22625">22625</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Dangling StringRef in clang/lib/Driver/ToolChains.cpp
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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>Driver
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zilla@kayari.org
</td>
</tr>
<tr>
<th>CC</th>
<td>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=13898" name="attach_13898" title="Avoid constructing a temporary std::string">attachment 13898</a> <a href="attachment.cgi?id=13898&action=edit" title="Avoid constructing a temporary std::string">[details]</a></span>
Avoid constructing a temporary std::string
In Linux::AddClangSystemIncludeArgs:
std::string SysRoot = computeSysRoot();
// ...
StringRef Prefix = llvm::sys::path::is_absolute(dir) ? SysRoot : "";
The conditional operator produces a std::string rvalue (either a copy of
SysRoot or constructed from the string literal) and so the StringRef is left
dangling.
This breaks clang bootstrap when using the new non-COW std::string in GCC5 (I'm
curious why it doesn't show up with the non-COW string in libc++).</pre>
</div>
</p>
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