[SYCL] Implement sycl_khr_includes extension (#20339)

The specification can be found in KhronosGroup/SYCL-Docs#814

The implementation is a non-functional change for the existing codebase,
but definitions of macro documented by the SYCL 2020 specifications were
moved around a little bit to provide them all through the new
`sycl/khr/version.hpp`.

New headers are always present and their content is always available.
However, we do not define `SYCL_KHR_INCLUDES` macro yet because the
extension is still on review. That indicates that it is not formally
supported by the implementation.

Author: AlexeySachkov

sycl/include/sycl/define_vendors.hpp

@@ -9,5 +9,4 @@
 #pragma once
 
 #define SYCL_IMPLEMENTATION_ONEAPI
-#define SYCL_FEATURE_SET_FULL
 #define SYCL_IMPLEMENTATION_INTEL

sycl/include/sycl/detail/is_device_copyable.hpp

@@ -14,11 +14,6 @@
 #include <type_traits>
 #include <variant>
 
-/// This macro must be defined to 1 when SYCL implementation allows user
-/// applications to explicitly declare certain class types as device copyable
-/// by adding specializations of is_device_copyable type trait class.
-#define SYCL_DEVICE_COPYABLE 1
-
 namespace sycl {
 inline namespace _V1 {
 /// is_device_copyable is a user specializable class template to indicate

sycl/include/sycl/khr/includes/accessor.hpp

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_ACCESSOR
+#define __SYCL_KHR_INCLUDES_ACCESSOR
+
+#include "version.hpp"
+
+#include <sycl/accessor.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_ACCESSOR

sycl/include/sycl/khr/includes/atomic.hpp

@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_ATOMIC
+#define __SYCL_KHR_INCLUDES_ATOMIC
+
+#include "version.hpp"
+
+#include <sycl/atomic_fence.hpp>
+#include <sycl/atomic_ref.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_ATOMIC

sycl/include/sycl/khr/includes/backend.hpp

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_BACKEND
+#define __SYCL_KHR_INCLUDES_BACKEND
+
+#include "version.hpp"
+
+#include <sycl/backend.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_BACKEND

sycl/include/sycl/khr/includes/bit.hpp

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_BIT
+#define __SYCL_KHR_INCLUDES_BIT
+
+#include "version.hpp"
+
+#include <sycl/bit_cast.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_BIT

sycl/include/sycl/khr/includes/buffer.hpp

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_BUFFER
+#define __SYCL_KHR_INCLUDES_BUFFER
+
+#include "version.hpp"
+
+#include <sycl/buffer.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_BUFFER

sycl/include/sycl/khr/includes/byte.hpp

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_BYTE
+#define __SYCL_KHR_INCLUDES_BYTE
+
+#include "version.hpp"
+
+#include <sycl/aliases.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_BYTE

sycl/include/sycl/khr/includes/context.hpp

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_CONTEXT
+#define __SYCL_KHR_INCLUDES_CONTEXT
+
+#include "version.hpp"
+
+#include <sycl/context.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_CONTEXT

sycl/include/sycl/khr/includes/device.hpp

@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __SYCL_KHR_INCLUDES_DEVICE
+#define __SYCL_KHR_INCLUDES_DEVICE
+
+#include "version.hpp"
+
+#include <sycl/aspects.hpp>
+#include <sycl/device.hpp>
+
+#endif // __SYCL_KHR_INCLUDES_DEVICE