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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - function declared as returning value but not returning a value results in SIGILL when executed"
href="http://llvm.org/bugs/show_bug.cgi?id=17375">17375</a>
</td>
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<th>Summary</th>
<td>function declared as returning value but not returning a value results in SIGILL when executed
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jorgensen@lowtechsolutions.net
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11282" name="attach_11282" title="c++ source demonstrating the problem, preprocessed">attachment 11282</a> <a href="attachment.cgi?id=11282&action=edit" title="c++ source demonstrating the problem, preprocessed">[details]</a></span>
c++ source demonstrating the problem, preprocessed
The following code, built against libstdc++ 4.7.3 results in SIGILL:
#include <future>
int main()
{
std::promise<int> promise;
(void) promise.get_future();
}
It turns out there's a bug in libstdc++ (include/future):
template<typename _Tp>
static bool
_S_check(const shared_ptr<_Tp>& __p)
{
if (!static_cast<bool>(__p))
__throw_future_error((int)future_errc::no_state);
}
the function doesn't return a value, but resulting in a SIGILL at runtime
doesn't seem like the best outcome. This bug may be the same as 16071 however
the comments there say that this problem is noted at compile-time by a warning
that is enabled by default. However I compiled with clang++ out of svn right
now and I got no such warning, no warnings at all in fact. Try it yourself:
clang++ -std=c++11 -g -o tester preprocessed.cpp
I've attached the (lzma-compressed) preprocessed source from above just to make
it easy.</pre>
</div>
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