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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - sporadic crashes while compiling min/max implementations"
href="https://bugs.llvm.org/show_bug.cgi?id=52345">52345</a>
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<th>Summary</th>
<td>sporadic crashes while compiling min/max implementations
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>12.0
</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>C++2a
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>janezz55@gmail.com
</td>
</tr>
<tr>
<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>Interestingly, clang++ won't crash every time, but only now and then:
clang++ -std=c++20 dpp.cpp -o dpp
code is here:
<a href="https://github.com/user1095108/dpp">https://github.com/user1095108/dpp</a>
the code that appears to cause the crash:
template <typename U>
constexpr static auto bit_size_v(CHAR_BIT * sizeof(U));
template <typename U>
constexpr static auto is_integral_v(
std::is_integral_v<U> || std::is_same_v<U, DPP_INT128T>
);
template <typename U>
constexpr static auto is_signed_v(
std::is_signed_v<U> || std::is_same_v<U, DPP_INT128T>
);
template <typename U>
consteval auto min() noexcept
{
if constexpr(detail::is_signed_v<U>)
{
return U(U(1) << (detail::bit_size_v<U> - 1));
}
else
{
return U{};
}
}
template <typename U>
consteval auto max() noexcept
{
if constexpr(detail::is_signed_v<U>)
{
return -U(min<U>() + U(1));
}
else
{
return ~U();
}
}</pre>
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