defines_elementary.hpp

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//==--- defines_elementary.hpp ---- Preprocessor directives (simplified) ---==//
//
// 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
//
//===----------------------------------------------------------------------===//
 
#pragma once
 
#ifndef __SYCL_DISABLE_NAMESPACE_INLINE__
#define __SYCL_INLINE_NAMESPACE(X) inline namespace X
#else
#define __SYCL_INLINE_NAMESPACE(X) namespace X
#endif // __SYCL_DISABLE_NAMESPACE_INLINE__
 
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
 
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif // __has_builtin
 
#ifndef __SYCL_ALWAYS_INLINE
#if __has_attribute(always_inline)
#define __SYCL_ALWAYS_INLINE __attribute__((always_inline))
#else
#define __SYCL_ALWAYS_INLINE
#endif
#endif // __SYCL_ALWAYS_INLINE
 
#ifndef SYCL_EXTERNAL
#define SYCL_EXTERNAL
#endif
 
#ifndef __SYCL_ID_QUERIES_FIT_IN_INT__
#define __SYCL_ID_QUERIES_FIT_IN_INT__ 0
#endif
 
#ifndef __SYCL_DEPRECATED
// The deprecated attribute is not supported in some situations(e.g. namespace)
// in C++14 mode
#if !defined(SYCL2020_DISABLE_DEPRECATION_WARNINGS) && __cplusplus >= 201703L
#define __SYCL_DEPRECATED(message) [[deprecated(message)]]
#else // SYCL_DISABLE_DEPRECATION_WARNINGS
#define __SYCL_DEPRECATED(message)
#endif // SYCL_DISABLE_DEPRECATION_WARNINGS
#endif // __SYCL_DEPRECATED
 
#ifndef __SYCL2020_DEPRECATED
#if SYCL_LANGUAGE_VERSION >= 202001 &&                                         \
    !defined(SYCL2020_DISABLE_DEPRECATION_WARNINGS)
#define __SYCL2020_DEPRECATED(message) __SYCL_DEPRECATED(message)
#else
#define __SYCL2020_DEPRECATED(message)
#endif
#endif // __SYCL2020_DEPRECATED
 
#ifndef __SYCL_INLINE_CONSTEXPR
// inline constexpr is a C++17 feature
#if __cplusplus >= 201703L
#define __SYCL_INLINE_CONSTEXPR inline constexpr
#else
#define __SYCL_INLINE_CONSTEXPR static constexpr
#endif
#endif // __SYCL_INLINE_CONSTEXPR
 
#ifndef __SYCL_HAS_CPP_ATTRIBUTE
#if defined(__cplusplus) && defined(__has_cpp_attribute)
#define __SYCL_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
#else
#define __SYCL_HAS_CPP_ATTRIBUTE(x) 0
#endif
#endif
 
#ifndef __SYCL_FALLTHROUGH
#if defined(__cplusplus) && __cplusplus > 201402L &&                           \
    __SYCL_HAS_CPP_ATTRIBUTE(fallthrough)
#define __SYCL_FALLTHROUGH [[fallthrough]]
#elif __SYCL_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
#define __SYCL_FALLTHROUGH [[gnu::fallthrough]]
#elif __has_attribute(fallthrough)
#define __SYCL_FALLTHROUGH __attribute__((fallthrough))
#elif __SYCL_HAS_CPP_ATTRIBUTE(clang::fallthrough)
#define __SYCL_FALLTHROUGH [[clang::fallthrough]]
#else
#define __SYCL_FALLTHROUGH
#endif
#endif // __SYCL_FALLTHROUGH
 
// Stringify an argument to pass it in _Pragma directive below.
#ifndef __SYCL_STRINGIFY
#define __SYCL_STRINGIFY(x) #x
#endif // __SYCL_STRINGIFY
 
// define __SYCL_WARNING convenience macro to report compiler warnings
#if defined(__GNUC__)
#define __SYCL_WARNING(msg) _Pragma(__SYCL_STRINGIFY(GCC warning msg))
#elif defined(_MSC_VER) && !defined(__clang__)
#define __SYCL_QUOTE1(x) #x
#define __SYCL_QUOTE(x) __SYCL_QUOTE1(x)
#define __SYCL_SRC_LOC __FILE__ ":" __SYCL_QUOTE(__LINE__)
#define __SYCL_WARNING(msg) __pragma(message(__SYCL_SRC_LOC " warning: " msg))
#else // clang et. al.
// clang emits "warning:" in the message pragma output
#define __SYCL_WARNING(msg) __pragma(message(msg))
#endif // __GNUC__
 
// Define __SYCL_UNROLL to add pragma/attribute unroll to a loop.
#ifndef __SYCL_UNROLL
#if defined(__INTEL_COMPILER) || defined(__INTEL_LLVM_COMPILER)
#define __SYCL_UNROLL(x) _Pragma(__SYCL_STRINGIFY(unroll x))
#elif defined(__clang__)
#define __SYCL_UNROLL(x) _Pragma(__SYCL_STRINGIFY(unroll x))
#elif (defined(__GNUC__) && __GNUC__ >= 8) ||                                  \
    (defined(__GNUG__) && __GNUG__ >= 8)
#define __SYCL_UNROLL(x) _Pragma(__SYCL_STRINGIFY(GCC unroll x))
#else
#define __SYCL_UNROLL(x)
#endif // compiler switch
#endif // __SYCL_UNROLL
 
#if !defined(SYCL_DISABLE_CPP_VERSION_CHECK_WARNING) && __cplusplus < 201703L
 
#if defined(_MSC_VER) && !defined(__clang__)
__SYCL_WARNING("DPCPP does not support C++ version earlier than C++17. Some "
               "features might not be available.")
#else
// This is the only way to emit a warning from system headers using clang, it
// cannot be wrapped by a macro(__pragma warning doesn't work in system
// headers). The solution is borrowed from libcxx.
#warning: DPCPP does not support C++ version earlier than C++17. Some features might not be available.
#endif
 
#endif