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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Constexpr new: uncatched UB in constant context"
href="https://bugs.llvm.org/show_bug.cgi?id=43685">43685</a>
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<th>Summary</th>
<td>Constexpr new: uncatched UB in constant context
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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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>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zamazan4ik@tut.by
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>For the following code:
#include <iostream>
#include <deque>
int main()
{
constexpr auto a = []()
{
std::deque<int> d;
d.push_back(42);
d.pop_back();
return d.front();
}();
std::cout << a << std::endl;
return 0;
}
instead of compilation error Clang(trunk) compiles successfully and the program
prints 42. If you add one more d.pop_back() compiler correctly recognizes UB
and stops compilation. Do I miss anything?
Preprocessed file: <a href="https://gofile.io/?c=XE2s96">https://gofile.io/?c=XE2s96</a>
Constexpr deque implementation:
<a href="https://github.com/ZaMaZaN4iK/llvm-project/tree/feature/deque_constexpr">https://github.com/ZaMaZaN4iK/llvm-project/tree/feature/deque_constexpr</a>
Latest commit in llvm-project: 8af5ada09319e5a021d57a1a03715b2fd022e415</pre>
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</p>
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