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diff --git a/include/clang/Basic/LangStandards.def b/include/clang/Basic/LangStandards.def
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+//===-- LangStandards.def - Language Standard Data --------------*- C++ -*-===//
+//
+// 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 LANGSTANDARD
+#error "LANGSTANDARD must be defined before including this file"
+#endif
+
+/// LANGSTANDARD(IDENT, NAME, LANG, DESC, FEATURES)
+///
+/// \param IDENT - The name of the standard as a C++ identifier.
+/// \param NAME - The name of the standard.
+/// \param LANG - The Language for which this is a standard.
+/// \param DESC - A short description of the standard.
+/// \param FEATURES - The standard features as flags, these are enums from the
+/// clang::frontend namespace, which is assumed to be be available.
+
+/// LANGSTANDARD_ALIAS(IDENT, ALIAS)
+/// \param IDENT - The name of the standard as a C++ identifier.
+/// \param ALIAS - The alias of the standard.
+
+/// LANGSTANDARD_ALIAS_DEPR(IDENT, ALIAS)
+/// Same as LANGSTANDARD_ALIAS, but for a deprecated alias.
+
+#ifndef LANGSTANDARD_ALIAS
+#define LANGSTANDARD_ALIAS(IDENT, ALIAS)
+#endif
+
+#ifndef LANGSTANDARD_ALIAS_DEPR
+#define LANGSTANDARD_ALIAS_DEPR(IDENT, ALIAS) LANGSTANDARD_ALIAS(IDENT, ALIAS)
+#endif
+
+// C89-ish modes.
+LANGSTANDARD(c89, "c89",
+             C, "ISO C 1990",
+             ImplicitInt)
+LANGSTANDARD_ALIAS(c89, "c90")
+LANGSTANDARD_ALIAS(c89, "iso9899:1990")
+
+LANGSTANDARD(c94, "iso9899:199409",
+             C, "ISO C 1990 with amendment 1",
+             Digraphs | ImplicitInt)
+
+LANGSTANDARD(gnu89, "gnu89",
+             C, "ISO C 1990 with GNU extensions",
+             LineComment | Digraphs | GNUMode | ImplicitInt)
+LANGSTANDARD_ALIAS(gnu89, "gnu90")
+
+// C99-ish modes
+LANGSTANDARD(c99, "c99",
+             C, "ISO C 1999",
+             LineComment | C99 | Digraphs | HexFloat)
+LANGSTANDARD_ALIAS(c99, "iso9899:1999")
+LANGSTANDARD_ALIAS_DEPR(c99, "c9x")
+LANGSTANDARD_ALIAS_DEPR(c99, "iso9899:199x")
+
+LANGSTANDARD(gnu99, "gnu99",
+             C, "ISO C 1999 with GNU extensions",
+             LineComment | C99 | Digraphs | GNUMode | HexFloat)
+LANGSTANDARD_ALIAS_DEPR(gnu99, "gnu9x")
+
+// C11 modes
+LANGSTANDARD(c11, "c11",
+             C, "ISO C 2011",
+             LineComment | C99 | C11 | Digraphs | HexFloat)
+LANGSTANDARD_ALIAS(c11, "iso9899:2011")
+LANGSTANDARD_ALIAS_DEPR(c11, "c1x")
+LANGSTANDARD_ALIAS_DEPR(c11, "iso9899:201x")
+
+LANGSTANDARD(gnu11, "gnu11",
+             C, "ISO C 2011 with GNU extensions",
+             LineComment | C99 | C11 | Digraphs | GNUMode | HexFloat)
+LANGSTANDARD_ALIAS_DEPR(gnu11, "gnu1x")
+
+// C17 modes
+LANGSTANDARD(c17, "c17",
+             C, "ISO C 2017",
+             LineComment | C99 | C11 | C17 | Digraphs | HexFloat)
+LANGSTANDARD_ALIAS(c17, "iso9899:2017")
+LANGSTANDARD_ALIAS(c17, "c18")
+LANGSTANDARD_ALIAS(c17, "iso9899:2018")
+LANGSTANDARD(gnu17, "gnu17",
+             C, "ISO C 2017 with GNU extensions",
+             LineComment | C99 | C11 | C17 | Digraphs | GNUMode | HexFloat)
+LANGSTANDARD_ALIAS(gnu17, "gnu18")
+
+// C2x modes
+LANGSTANDARD(c2x, "c2x",
+             C, "Working Draft for ISO C2x",
+             LineComment | C99 | C11 | C17 | C2x | Digraphs | HexFloat)
+LANGSTANDARD(gnu2x, "gnu2x",
+             C, "Working Draft for ISO C2x with GNU extensions",
+             LineComment | C99 | C11 | C17 | C2x | Digraphs | GNUMode | HexFloat)
+
+// C++ modes
+LANGSTANDARD(cxx98, "c++98",
+             CXX, "ISO C++ 1998 with amendments",
+             LineComment | CPlusPlus | Digraphs)
+LANGSTANDARD_ALIAS(cxx98, "c++03")
+
+LANGSTANDARD(gnucxx98, "gnu++98",
+             CXX, "ISO C++ 1998 with amendments and GNU extensions",
+             LineComment | CPlusPlus | Digraphs | GNUMode)
+LANGSTANDARD_ALIAS(gnucxx98, "gnu++03")
+
+LANGSTANDARD(cxx11, "c++11",
+             CXX, "ISO C++ 2011 with amendments",
+             LineComment | CPlusPlus | CPlusPlus11 | Digraphs)
+LANGSTANDARD_ALIAS_DEPR(cxx11, "c++0x")
+
+LANGSTANDARD(gnucxx11, "gnu++11", CXX,
+             "ISO C++ 2011 with amendments and GNU extensions",
+             LineComment | CPlusPlus | CPlusPlus11 | Digraphs | GNUMode)
+LANGSTANDARD_ALIAS_DEPR(gnucxx11, "gnu++0x")
+
+LANGSTANDARD(cxx14, "c++14",
+             CXX, "ISO C++ 2014 with amendments",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | Digraphs)
+LANGSTANDARD_ALIAS_DEPR(cxx14, "c++1y")
+
+LANGSTANDARD(gnucxx14, "gnu++14",
+             CXX, "ISO C++ 2014 with amendments and GNU extensions",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | Digraphs |
+             GNUMode)
+LANGSTANDARD_ALIAS_DEPR(gnucxx14, "gnu++1y")
+
+LANGSTANDARD(cxx17, "c++17",
+             CXX, "ISO C++ 2017 with amendments",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | CPlusPlus17 |
+             Digraphs | HexFloat)
+LANGSTANDARD_ALIAS_DEPR(cxx17, "c++1z")
+
+LANGSTANDARD(gnucxx17, "gnu++17",
+             CXX, "ISO C++ 2017 with amendments and GNU extensions",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | CPlusPlus17 |
+             Digraphs | HexFloat | GNUMode)
+LANGSTANDARD_ALIAS_DEPR(gnucxx17, "gnu++1z")
+
+LANGSTANDARD(cxx2a, "c++2a",
+             CXX, "Working draft for ISO C++ 2020",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | CPlusPlus17 |
+             CPlusPlus2a | Digraphs | HexFloat)
+
+LANGSTANDARD(gnucxx2a, "gnu++2a",
+             CXX, "Working draft for ISO C++ 2020 with GNU extensions",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | CPlusPlus17 |
+             CPlusPlus2a | Digraphs | HexFloat | GNUMode)
+
+// OpenCL
+LANGSTANDARD(opencl10, "cl1.0",
+             OpenCL, "OpenCL 1.0",
+             LineComment | C99 | Digraphs | HexFloat | OpenCL)
+LANGSTANDARD_ALIAS_DEPR(opencl10, "cl")
+
+LANGSTANDARD(opencl11, "cl1.1",
+             OpenCL, "OpenCL 1.1",
+             LineComment | C99 | Digraphs | HexFloat | OpenCL)
+LANGSTANDARD(opencl12, "cl1.2",
+             OpenCL, "OpenCL 1.2",
+             LineComment | C99 | Digraphs | HexFloat | OpenCL)
+LANGSTANDARD(opencl20, "cl2.0",
+             OpenCL, "OpenCL 2.0",
+             LineComment | C99 | Digraphs | HexFloat | OpenCL)
+LANGSTANDARD(openclcpp, "clc++",
+             OpenCL, "C++ for OpenCL",
+             LineComment | CPlusPlus | CPlusPlus11 | CPlusPlus14 | CPlusPlus17 |
+             Digraphs | HexFloat | OpenCL)
+
+LANGSTANDARD_ALIAS_DEPR(opencl10, "CL")
+LANGSTANDARD_ALIAS_DEPR(opencl11, "CL1.1")
+LANGSTANDARD_ALIAS_DEPR(opencl12, "CL1.2")
+LANGSTANDARD_ALIAS_DEPR(opencl20, "CL2.0")
+LANGSTANDARD_ALIAS_DEPR(openclcpp, "CLC++")
+
+// CUDA
+LANGSTANDARD(cuda, "cuda", CUDA, "NVIDIA CUDA(tm)",
+             LineComment | CPlusPlus | Digraphs)
+
+// HIP
+LANGSTANDARD(hip, "hip", HIP, "HIP",
+             LineComment | CPlusPlus | Digraphs)
+
+#undef LANGSTANDARD
+#undef LANGSTANDARD_ALIAS
+#undef LANGSTANDARD_ALIAS_DEPR