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diff --git a/contrib/llvm/tools/clang/lib/Tooling/CustomCompilationDatabase.h b/contrib/llvm/tools/clang/lib/Tooling/CustomCompilationDatabase.h
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+++ b/contrib/llvm/tools/clang/lib/Tooling/CustomCompilationDatabase.h
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+//===--- CustomCompilationDatabase.h --------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file contains a hook to supply a custom \c CompilationDatabase
+//  implementation.
+//
+//  The mechanism can be used by IDEs or non-public code bases to integrate with
+//  their build system. Currently we support statically linking in an
+//  implementation of \c findCompilationDatabaseForDirectory and enabling it
+//  with -DUSE_CUSTOM_COMPILATION_DATABASE when compiling the Tooling library.
+//
+//  FIXME: The strategy forward is to provide a plugin system that can load
+//  custom compilation databases and make enabling that a build option.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_TOOLING_CUSTOM_COMPILATION_DATABASE_H
+#define LLVM_CLANG_TOOLING_CUSTOM_COMPILATION_DATABASE_H
+
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+namespace tooling {
+class CompilationDatabase;
+
+/// \brief Returns a CompilationDatabase for the given \c Directory.
+///
+/// \c Directory can be any directory within a project. This methods will
+/// then try to find compilation database files in \c Directory or any of its
+/// parents. If a compilation database cannot be found or loaded, returns NULL.
+clang::tooling::CompilationDatabase *findCompilationDatabaseForDirectory(
+  llvm::StringRef Directory);
+
+} // namespace tooling
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLING_CUSTOM_COMPILATION_DATABASE_H