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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - constexpr constructors for data types from -finclude-default-header"
href="https://bugs.llvm.org/show_bug.cgi?id=42387">42387</a>
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<th>Summary</th>
<td>constexpr constructors for data types from -finclude-default-header
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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>OpenCL
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>drohr@jwdt.org
</td>
</tr>
<tr>
<th>CC</th>
<td>anastasia.stulova@arm.com, llvm-bugs@lists.llvm.org
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<pre>The following code
struct float3a { float x, y, z; };
constexpr float3 crossProduct(const float3& firstVector, const float3&
secondVector)
{
return float3{ (firstVector.y * secondVector.z) - (firstVector.z *
secondVector.y),
(firstVector.z * secondVector.x) - (firstVector.x *
secondVector.z),
(firstVector.x * secondVector.y) - (firstVector.y *
secondVector.x) };
}
constexpr float3a crossProduct(const float3& firstVector, const float3&
secondVector)
{
return float3a{ (firstVector.y * secondVector.z) - (firstVector.z *
secondVector.y),
(firstVector.z * secondVector.x) - (firstVector.x *
secondVector.z),
(firstVector.x * secondVector.y) - (firstVector.y *
secondVector.x) };
}
compiled with "clang++ -cl-std=c++ -Xclang -finclude-default-header" fails with
test.cl:3:18: error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
constexpr float3 crossProduct(const float3& firstVector, const float3&
secondVector)
^
test.cl:5:19: note: subexpression not valid in a constant expression
return float3{ (firstVector.y * secondVector.z) - (firstVector.z *
secondVector.y),
^
test.cl:10:19: error: functions that differ only in their return type cannot be
overloaded
constexpr float3a crossProduct(const float3& firstVector, const float3&
secondVector)
~~~~~~~ ^
test.cl:3:18: note: previous definition is here
constexpr float3 crossProduct(const float3& firstVector, const float3&
secondVector)
since apparently one cannot create a float3 from -finclude-default-header in a
constexpr way, while it works with the manually-defined float3a.</pre>
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