[clangd] Rename Features.h -> Feature.h to avoid confilct with libstdc++

[sammccall]

Summary

Fixes https://github.com/clangd/clangd/issues/835

[kadircet]

Thanks, LGTM!

clang-tools-extra/clangd/CMakeLists.txt

add_clang_library(clangDaemon
   ConfigCompile.cpp
   ConfigProvider.cpp
   ConfigYAML.cpp
   Diagnostics.cpp
   DraftStore.cpp
   DumpAST.cpp
   ExpectedTypes.cpp
   FeatureModule.cpp
-  Features.cpp
+  Feature.cpp
   FindSymbols.cpp
   FindTarget.cpp
   FileDistance.cpp
   Format.cpp
   FS.cpp
   FuzzyMatch.cpp
   GlobalCompilationDatabase.cpp
   Headers.cpp

clang-tools-extra/clangd/ClangdLSPServer.cpp

 //===--- ClangdLSPServer.cpp - LSP server ------------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 
 #include "ClangdLSPServer.h"
 #include "ClangdServer.h"
 #include "CodeComplete.h"
 #include "Diagnostics.h"
 #include "DraftStore.h"
 #include "DumpAST.h"
-#include "Features.h"
+#include "Feature.h"
 #include "GlobalCompilationDatabase.h"
 #include "LSPBinder.h"
 #include "Protocol.h"
 #include "SemanticHighlighting.h"
 #include "SourceCode.h"
 #include "TUScheduler.h"
 #include "URI.h"
 #include "refactor/Tweak.h"

clang-tools-extra/clangd/ConfigCompile.cpp

 //
 //===----------------------------------------------------------------------===//
 
 #include "CompileCommands.h"
 #include "Config.h"
 #include "ConfigFragment.h"
 #include "ConfigProvider.h"
 #include "Diagnostics.h"
-#include "Features.h"
+#include "Feature.h"
 #include "TidyProvider.h"
 #include "support/Logger.h"
 #include "support/Path.h"
 #include "support/Trace.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"

clang-tools-extra/clangd/Feature.h

-//===--- Features.h - Compile-time configuration ------------------*-C++-*-===//
+//===--- Feature.h - Compile-time configuration ------------------*-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
 //
 //===----------------------------------------------------------------------===//
+// This file is not named "Features.h" because of a conflict with libstdc++:
+// https://github.com/clangd/clangd/issues/835
+//===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_FEATURES_H
-#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_FEATURES_H
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_FEATURE_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_FEATURE_H
 #include <string>
 
 // Export constants like CLANGD_BUILD_XPC
 #include "Features.inc"
 
 namespace clang {
 namespace clangd {
 

clang-tools-extra/clangd/Feature.cpp

-//===--- Features.cpp - Compile-time configuration ------------------------===//
+//===--- Feature.cpp - Compile-time configuration ------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-#include "Features.h"
+#include "Feature.h"
 #include "clang/Basic/Version.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Host.h"
 
 namespace clang {
 namespace clangd {
 
 std::string versionString() { return clang::getClangToolFullVersion("clangd"); }

clang-tools-extra/clangd/ParsedAST.cpp

 //===--- ParsedAST.cpp -------------------------------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 
 #include "ParsedAST.h"
 #include "../clang-tidy/ClangTidyCheck.h"
 #include "../clang-tidy/ClangTidyDiagnosticConsumer.h"
 #include "../clang-tidy/ClangTidyModuleRegistry.h"
 #include "AST.h"
 #include "Compiler.h"
 #include "Config.h"
 #include "Diagnostics.h"
+#include "Feature.h"
 #include "FeatureModule.h"
-#include "Features.h"
 #include "Headers.h"
 #include "HeuristicResolver.h"
 #include "IncludeFixer.h"
 #include "Preamble.h"
 #include "SourceCode.h"
 #include "TidyProvider.h"
 #include "index/CanonicalIncludes.h"
 #include "index/Index.h"

clang-tools-extra/clangd/Transport.h

 // The Transport interface allows the mechanism to be replaced, and the JSONRPC
 // Transport is the standard implementation.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_TRANSPORT_H_
 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_TRANSPORT_H_
 
-#include "Features.h"
+#include "Feature.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/JSON.h"
 #include "llvm/Support/raw_ostream.h"
 
 namespace clang {
 namespace clangd {
 
 // A transport is responsible for maintaining the connection to a client

clang-tools-extra/clangd/index/remote/Client.cpp

 //===--- Client.cpp ----------------------------------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 
 #include <grpc++/grpc++.h>
 
 #include "Client.h"
-#include "Features.h"
+#include "Feature.h"
 #include "Service.grpc.pb.h"
 #include "index/Index.h"
 #include "marshalling/Marshalling.h"
 #include "support/Logger.h"
 #include "support/Trace.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Error.h"

clang-tools-extra/clangd/index/remote/server/Server.cpp

 //===--- Server.cpp - gRPC-based Remote Index Server  ---------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-#include "Features.h"
+#include "Feature.h"
 #include "Index.pb.h"
 #include "MonitoringService.grpc.pb.h"
 #include "MonitoringService.pb.h"
 #include "Service.grpc.pb.h"
 #include "Service.pb.h"
 #include "index/Index.h"
 #include "index/Serialization.h"
 #include "index/Symbol.h"
 #include "index/remote/marshalling/Marshalling.h"

clang-tools-extra/clangd/tool/ClangdMain.cpp

 //===--- ClangdMain.cpp - clangd server loop ------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 #include "ClangdLSPServer.h"
 #include "CodeComplete.h"
 #include "Config.h"
 #include "ConfigProvider.h"
-#include "Features.h"
+#include "Feature.h"
 #include "PathMapping.h"
 #include "Protocol.h"
 #include "TidyProvider.h"
 #include "Transport.h"
 #include "index/Background.h"
 #include "index/Index.h"
 #include "index/Merge.h"
 #include "index/ProjectAware.h"

clang-tools-extra/clangd/unittests/ConfigCompileTests.cpp

 //===-- ConfigCompileTests.cpp --------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 #include "Config.h"
 #include "ConfigFragment.h"
 #include "ConfigTesting.h"
-#include "Features.h"
+#include "Feature.h"
 #include "TestFS.h"
 #include "clang/Basic/DiagnosticSema.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/SourceMgr.h"
 #include "gmock/gmock.h"

clang-tools-extra/clangd/unittests/DiagnosticsTests.cpp

 //===--- DiagnosticsTests.cpp ------------------------------------*- 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
 //
 //===----------------------------------------------------------------------===//
 
 #include "Annotations.h"
 #include "Config.h"
 #include "Diagnostics.h"
+#include "Feature.h"
 #include "FeatureModule.h"
-#include "Features.h"
 #include "ParsedAST.h"
 #include "Protocol.h"
 #include "SourceCode.h"
 #include "TestFS.h"
 #include "TestIndex.h"
 #include "TestTU.h"
 #include "TidyProvider.h"
 #include "index/MemIndex.h"