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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Stop adding new type traits builtins without adding __has_feature support for them"
href="https://bugs.llvm.org/show_bug.cgi?id=44517">44517</a>
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<th>Summary</th>
<td>Stop adding new type traits builtins without adding __has_feature support for them
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>brycelelbach@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>We seem to be forgetting to update __has_feature when adding new type traits
builtins.
__has_feature works with most type traits builtins, but not __is_function,
__is_assignable, or __is_nothrow_constructible.
This is a bit of a pain for us in libc++.
<a href="https://godbolt.org/z/iuVLDe">https://godbolt.org/z/iuVLDe</a></pre>
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