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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [[clang::require_constant_initialization]] says a global with a defaulted trivial constructor is not constant initialized"
href="https://bugs.llvm.org/show_bug.cgi?id=41586">41586</a>
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<th>Summary</th>
<td>[[clang::require_constant_initialization]] says a global with a defaulted trivial constructor is not constant initialized
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
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<th>CC</th>
<td>eric@efcs.ca, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Consider:
struct Foo { int x; };
[[clang::require_constant_initialization]] Foo obj1; // error
[[clang::require_constant_initialization]] Foo obj2{}; // ok
Clang says:
t.cpp:2:48: error: variable does not have a constant initializer
[[clang::require_constant_initialization]] Foo obj1; // error
^~~~
t.cpp:2:3: note: required by 'require_constant_initialization' attribute here
[[clang::require_constant_initialization]] Foo obj1; // error
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
t.cpp:2:48: note: non-constexpr constructor 'Foo' cannot be used in a constant
expression
[[clang::require_constant_initialization]] Foo obj1; // error
^
t.cpp:1:8: note: declared here
struct Foo { int x; };
^
It's true that Foo's default constructor is not constexpr, it is trivial, and
it does not initialize its members. However, no dynamic initializer is needed
for obj1, which I think is the important thing that the user of this attribute
is probably looking for. Should we make an exception for this?</pre>
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