--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang-tools-extra/clang-tidy/bugprone/SuspiciousIncludeCheck.h	Mon May 25 11:55:54 2020 +0900
@@ -0,0 +1,57 @@
+//===--- SuspiciousIncludeCheck.h - clang-tidy ------------------*- 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 LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SUSPICIOUSINCLUDECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SUSPICIOUSINCLUDECHECK_H
+
+#include "../ClangTidyCheck.h"
+#include "../utils/FileExtensionsUtils.h"
+
+namespace clang {
+namespace tidy {
+namespace bugprone {
+
+/// Warns on inclusion of files whose names suggest that they're implementation
+/// files, instead of headers. E.g:
+///
+///     #include "foo.cpp"  // warning
+///     #include "bar.c"    // warning
+///     #include "baz.h"    // no diagnostic
+///
+/// The check supports these options:
+///   - `HeaderFileExtensions`: a semicolon-separated list of filename
+///     extensions of header files (The filename extensions should not contain
+///     "." prefix) ";h;hh;hpp;hxx" by default. For extension-less header
+///     files, using an empty string or leaving an empty string between ";" if
+///     there are other filename extensions.
+///
+///   - `ImplementationFileExtensions`: likewise, a semicolon-separated list of
+///     filename extensions of implementation files. "c;cc;cpp;cxx" by default.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone-suspicious-include.html
+class SuspiciousIncludeCheck : public ClangTidyCheck {
+public:
+  SuspiciousIncludeCheck(StringRef Name, ClangTidyContext *Context);
+  void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
+                           Preprocessor *ModuleExpanderPP) override;
+  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+
+  utils::FileExtensionsSet HeaderFileExtensions;
+  utils::FileExtensionsSet ImplementationFileExtensions;
+
+private:
+  const std::string RawStringHeaderFileExtensions;
+  const std::string RawStringImplementationFileExtensions;
+};
+
+} // namespace bugprone
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SUSPICIOUSINCLUDECHECK_H