[llvm-bugs] [Bug 47882] New: Not all OpenCL extensions are disabled by default

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47882

            Bug ID: 47882
           Summary: Not all OpenCL extensions are disabled by default
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: OpenCL
          Assignee: unassignedclangbugs at nondot.org
          Reporter: marco.antognini at arm.com
                CC: anastasia.stulova at arm.com, llvm-bugs at lists.llvm.org

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.

https://godbolt.org/z/WrMsMj

For reference, see the specification
https://www.khronos.org/registry/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#compiler-directives-for-optional-extensions

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