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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - When compiling with `-fopenmp` clang will under certain circumstances not produce symbols for const or constexpr static data members."
href="https://bugs.llvm.org/show_bug.cgi?id=37918">37918</a>
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<th>Summary</th>
<td>When compiling with `-fopenmp` clang will under certain circumstances not produce symbols for const or constexpr static data members.
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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>chris@detrino.org
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>This seems to happen when the following is true:
- A const or constexpr static data member is declared in a class.
- The data member is ODR-used before its definition is seen.
- The TU is compiled with `-fopenmp`
- This all happens in the global namespace.
A reduced test-case:
// Section A - Define a class with a static constexpr data member.
struct Foo {
static constexpr int bar = 1;
};
// Section B - ODR-use the data member.
void F(const int&);
void Test() { F(Foo::bar); }
// Section C - Define the data member.
constexpr int Foo::bar;
In this example, the `Foo::bar` symbol will not be produced in the output
.s/.o. This can be worked around by moving `Section C` before `Section B`. See
<a href="https://godbolt.org/g/LrzUvY">https://godbolt.org/g/LrzUvY</a> for a live demo.</pre>
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