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<body><span class="vcard"><a class="email" href="mailto:hfinkel@anl.gov" title="Hal Finkel <hfinkel@anl.gov>"> <span class="fn">Hal Finkel</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Generated code crashes in -O2/-O3 because of template expansion"
href="http://llvm.org/bugs/show_bug.cgi?id=22636">bug 22636</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Generated code crashes in -O2/-O3 because of template expansion"
href="http://llvm.org/bugs/show_bug.cgi?id=22636#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Generated code crashes in -O2/-O3 because of template expansion"
href="http://llvm.org/bugs/show_bug.cgi?id=22636">bug 22636</a>
from <span class="vcard"><a class="email" href="mailto:hfinkel@anl.gov" title="Hal Finkel <hfinkel@anl.gov>"> <span class="fn">Hal Finkel</span></a>
</span></b>
<pre>Unfortunately, the source code provided is not valid. Specifically, binding a
null pointer to a reference in C++ produces undefined behavior. GCC does not
take advantage of this fact, but Clang does.
There was a note about this in the Clang 3.5 release notes. It says:
C++ Language Changes in Clang
-----------------------------
- Reference parameters and return values from functions are more aggressively
assumed to refer to valid objects when optimizing. Clang will attempt to
issue a warning by default if it sees null checks being performed on
references, and `-fsanitize=null` can be used to detect null references
being formed at runtime.</pre>
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