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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang should turn destroying delete off by default."
href="https://bugs.llvm.org/show_bug.cgi?id=40576">40576</a>
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<th>Summary</th>
<td>Clang should turn destroying delete off by default.
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>eric@efcs.ca
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Defining new names in namespace `std` is technically a non-conforming
extensions. This makes it difficult for libc++ to backport C++20 destroying
delete.
Currently Clang unconditionally defines `__cpp_impl_destroying_delete`. Unlike
aligned allocation or sized deallocation which can be turned on or off by user.
I believe we should make destroying delete act similarly. We should provide
flags for enabling destroying delete prior to C++17. After
`__cpp_impl_destroying_delete` should be defined by default.
Lets also consider whether Clang should provide destroying delete as an
extension prior to C++20.
PS. I'm concerned that if Clang always provides destroying delete but libc++
doesn't define it until C++20, then users will be dinks and define their own
`std::destroying_delete_t` as a workaround.</pre>
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