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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Inconsistent issue of the `ud2` instruction at the bottom of functions with no return statements"
href="http://llvm.org/bugs/show_bug.cgi?id=16688">bug 16688</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
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<td>richard-llvm@metafoo.co.uk
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Inconsistent issue of the `ud2` instruction at the bottom of functions with no return statements"
href="http://llvm.org/bugs/show_bug.cgi?id=16688#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Inconsistent issue of the `ud2` instruction at the bottom of functions with no return statements"
href="http://llvm.org/bugs/show_bug.cgi?id=16688">bug 16688</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>This is all correct; falling of a value-returning function has undefined
behavior in C++ (and not in C). At -O0, the undefined behavior causes a trap;
at -O1 and above, we optimize on the basis of it being unreachable.
Your "-w" is suppressing both the warning telling you the code is broken and
the warning telling you that using "clang++" causes the ".c" input to be
treated as a C++ source file.</pre>
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