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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Not treating unions with at least one literal member as literal"
href="https://bugs.llvm.org/show_bug.cgi?id=48286">48286</a>
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<th>Summary</th>
<td>Not treating unions with at least one literal member as literal
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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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>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ant.bikineev@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>Clang fails to compile the following code:
std::optional<NonLiteral> unpopulated{};
The reduced example is:
template <typename T>
struct A {
union {
char c = 0;
T t;
};
};
constexpr A<NonLiteral> unpopulated{};
The error clang emits is:
error: constexpr variable cannot have non-literal type 'const A<NonLiteral>'
constexpr A<NonLiteral> unpopulated{};
^
note: 'A<NonLiteral>' is not literal because it has data member '' of
non-literal type 'union (anonymous union at ...)'
A relevant section from the Standard (unless I'm missing another one):
[6.8.1.10]
A type is a literal type if it is:
- ...
- if it is a union, at least one of its non-static data members is of
non-volatile literal type, and ...
gcc succeeds to compile this example.</pre>
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