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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang incorrectly emits definition for undefined constexpr static data member."
href="https://llvm.org/bugs/show_bug.cgi?id=28390">28390</a>
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<th>Summary</th>
<td>Clang incorrectly emits definition for undefined constexpr static data member.
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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
</td>
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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>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>eric@efcs.ca
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Reproducer:
//---------------------
struct Foo {
static const bool undefined = true; // still is correctly undefined
static constexpr bool incorrectly_defined = true; // clang emits a definition
};
void test(const bool&) {}
int main() {
test(Foo::incorrectly_defined); // shouldn't link
// test(Foo::undefined); // doesn't link
}
//------------------------
Clang has started emitting a definition for "incorrectly_defined", this means
the above test case compiles and links successfully when it could fail to
compile. It also causes ODR violations when "incorrectly_defined" is actually
defined in another TU.
Note that Clang did not emit a definition for this code in 3.8, and I think it
started within the last two weeks, since that's when I started noticing errors.</pre>
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