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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Not all OpenCL extensions are disabled by default"
href="https://bugs.llvm.org/show_bug.cgi?id=47882">47882</a>
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<th>Summary</th>
<td>Not all OpenCL extensions are disabled by default
</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>Linux
</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
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<th>Component</th>
<td>OpenCL
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>marco.antognini@arm.com
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<th>CC</th>
<td>anastasia.stulova@arm.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The OpenCL specification requires implementation to disable all extensions by
default. This implies that using any builtin functions from an extension should
produce a compile-time error.
Clang doesn't respect this rules, at least not for all extensions as the
following example shows:
unsigned int foo() {
return get_sub_group_size();
}
This code compiles (while it should not) when using `opencl-c.h` and doesn't
(as expected) when using -fdeclare-opencl-builtins.
<a href="https://godbolt.org/z/WrMsMj">https://godbolt.org/z/WrMsMj</a>
For reference, see the specification
<a href="https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#compiler-directives-for-optional-extensions">https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#compiler-directives-for-optional-extensions</a></pre>
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</p>
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