Index: llvm/utils/gn/secondary/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/BUILD.gn
+++ llvm/utils/gn/secondary/BUILD.gn
@@ -5,6 +5,7 @@
 group("default") {
   deps = [
     "//clang-tools-extra/clang-apply-replacements/tool:clang-apply-replacements",
+    "//clang-tools-extra/clang-doc/tool:clang-doc",
     "//clang-tools-extra/clang-tidy/tool:clang-tidy",
     "//clang/test",
     "//lld/test",
Index: llvm/utils/gn/secondary/clang-tools-extra/clang-doc/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang-tools-extra/clang-doc/BUILD.gn
@@ -0,0 +1,29 @@
+static_library("clang-doc") {
+  output_name = "clangDoc"
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Analysis",
+    "//clang/lib/Basic",
+    "//clang/lib/Frontend",
+    "//clang/lib/Index",
+    "//clang/lib/Lex",
+    "//clang/lib/Tooling",
+    "//clang/lib/Tooling/Core",
+    "//llvm/lib/Bitcode/Reader",
+    "//llvm/lib/Bitcode/Writer",
+    "//llvm/lib/Support",
+  ]
+  sources = [
+    "BitcodeReader.cpp",
+    "BitcodeWriter.cpp",
+    "ClangDoc.cpp",
+    "Generators.cpp",
+    "MDGenerator.cpp",
+    "Mapper.cpp",
+    "Representation.cpp",
+    "Serialize.cpp",
+    "YAMLGenerator.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/clang-tools-extra/clang-doc/tool/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang-tools-extra/clang-doc/tool/BUILD.gn
@@ -0,0 +1,16 @@
+executable("clang-doc") {
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang-tools-extra/clang-doc",
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Basic",
+    "//clang/lib/Frontend",
+    "//clang/lib/Tooling",
+    "//clang/lib/Tooling/Core",
+  ]
+  include_dirs = [ ".." ]
+  sources = [
+    "ClangDocMain.cpp",
+  ]
+}