Index: tools/libclang/CIndex.cpp
===================================================================
--- tools/libclang/CIndex.cpp
+++ tools/libclang/CIndex.cpp
@@ -7930,3 +7930,10 @@
     OS << "--------------------------------------------------\n";
   }
 }
+
+#ifdef CLANG_TOOL_EXTRA_BUILD
+// This anchor is used to force the linker to link the clang-tidy plugin.
+extern volatile int ClangTidyPluginAnchorSource;
+static int LLVM_ATTRIBUTE_UNUSED ClangTidyPluginAnchorDestination =
+    ClangTidyPluginAnchorSource;
+#endif
Index: tools/libclang/CMakeLists.txt
===================================================================
--- tools/libclang/CMakeLists.txt
+++ tools/libclang/CMakeLists.txt
@@ -47,6 +47,11 @@
   list(APPEND LIBS clangARCMigrate)
 endif ()
 
+if (CLANG_TOOL_EXTRA_BUILD)
+  add_definitions(-DCLANG_TOOL_EXTRA_BUILD)
+  list(APPEND LIBS clangTidyPlugin)
+endif ()
+
 find_library(DL_LIBRARY_PATH dl)
 if (DL_LIBRARY_PATH)
   list(APPEND LIBS dl)