Index: llvm/utils/gn/secondary/clang/lib/ASTMatchers/Dynamic/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/lib/ASTMatchers/Dynamic/BUILD.gn
@@ -0,0 +1,18 @@
+static_library("Dynamic") {
+  output_name = "clangDynamicASTMatchers"
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Basic",
+    "//llvm/lib/Support",
+  ]
+  sources = [
+    "Diagnostics.cpp",
+    "Parser.cpp",
+    "Registry.cpp",
+    "VariantValue.cpp",
+  ]
+
+  # FIXME: if msvc cflags += /bigobj
+}
Index: llvm/utils/gn/secondary/clang/test/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/clang/test/BUILD.gn
+++ llvm/utils/gn/secondary/clang/test/BUILD.gn
@@ -125,6 +125,7 @@
     "//clang/tools/clang-rename",
     "//clang/tools/diagtool",
     "//clang/tools/driver:symlinks",
+    "//clang/unittests",
     "//clang/utils/TableGen:clang-tblgen",
     "//clang/utils/hmaptool",
     "//llvm/tools/llc",
@@ -159,7 +160,6 @@
     ]
   }
 
-  # FIXME: dep on "//clang/unittests" once it exists
   # FIXME: clang_build_examples
   testonly = true
 }
Index: llvm/utils/gn/secondary/clang/unittests/AST/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/AST/BUILD.gn
@@ -0,0 +1,36 @@
+executable("ASTTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  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/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "ASTContextParentMapTest.cpp",
+    "ASTImporterTest.cpp",
+    "ASTTypeTraitsTest.cpp",
+    "ASTVectorTest.cpp",
+    "CommentLexer.cpp",
+    "CommentParser.cpp",
+    "CommentTextTest.cpp",
+    "DataCollectionTest.cpp",
+    "DeclPrinterTest.cpp",
+    "DeclTest.cpp",
+    "EvaluateAsRValueTest.cpp",
+    "ExternalASTSourceTest.cpp",
+    "Language.cpp",
+    "NamedDeclPrinterTest.cpp",
+    "SourceLocationTest.cpp",
+    "StmtPrinterTest.cpp",
+    "StructuralEquivalenceTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/ASTMatchers/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/ASTMatchers/BUILD.gn
@@ -0,0 +1,22 @@
+executable("ASTMatchersTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Basic",
+    "//clang/lib/Frontend",
+    "//clang/lib/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "ASTMatchersInternalTest.cpp",
+    "ASTMatchersNarrowingTest.cpp",
+    "ASTMatchersNodeTest.cpp",
+    "ASTMatchersTraversalTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/ASTMatchers/Dynamic/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/ASTMatchers/Dynamic/BUILD.gn
@@ -0,0 +1,22 @@
+executable("DynamicASTMatchersTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/ASTMatchers/Dynamic",
+    "//clang/lib/Basic",
+    "//clang/lib/Frontend",
+    "//clang/lib/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "ParserTest.cpp",
+    "RegistryTest.cpp",
+    "VariantValueTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Analysis/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Analysis/BUILD.gn
@@ -0,0 +1,22 @@
+executable("ClangAnalysisTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  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/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "CFGTest.cpp",
+    "CloneDetectionTest.cpp",
+    "ExprMutationAnalyzerTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/BUILD.gn
@@ -0,0 +1,35 @@
+import("//clang/lib/StaticAnalyzer/Frontend/enable.gni")
+
+group("unittests") {
+  deps = [
+    "AST:ASTTests",
+    "ASTMatchers:ASTMatchersTests",
+    "ASTMatchers/Dynamic:DynamicASTMatchersTests",
+    "Basic:BasicTests",
+    "CodeGen:ClangCodeGenTests",
+    "CrossTU:CrossTUTests",
+    "Driver:ClangDriverTests",
+    "Format:FormatTests",
+    "Index:IndexTests",
+    "Lex:LexTests",
+    "Rename:ClangRenameTests",
+    "Rewrite:RewriteTests",
+    "Sema:SemaTests",
+    "Tooling:ToolingTests",
+  ]
+  if (clang_enable_static_analyzer) {
+    deps += [
+      "Analysis:ClangAnalysisTests",
+      "Frontend:FrontendTests",
+      "StaticAnalyzer:StaticAnalysisTests",
+    ]
+  }
+  if (host_os != "win") {
+    # FIXME: libclang unit tests are disabled on Windows due
+    # to failures, mostly in libclang.VirtualFileOverlay_*.
+    # FIXME: Also, the executable can't find libclang.dll since that's
+    # in a different directory.
+    deps += [ "libclang:libclangTests" ]
+  }
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Basic/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Basic/BUILD.gn
@@ -0,0 +1,21 @@
+executable("BasicTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/Basic",
+    "//clang/lib/Lex",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "CharInfoTest.cpp",
+    "DiagnosticTest.cpp",
+    "FileManagerTest.cpp",
+    "FixedPointTest.cpp",
+    "MemoryBufferCacheTest.cpp",
+    "SourceManagerTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/CodeGen/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/CodeGen/BUILD.gn
@@ -0,0 +1,24 @@
+executable("ClangCodeGenTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/CodeGen",
+    "//clang/lib/Frontend",
+    "//clang/lib/Lex",
+    "//clang/lib/Parse",
+    "//llvm/lib/IR",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "BufferSourceTest.cpp",
+    "CodeGenExternalTest.cpp",
+    "IncrementalProcessingTest.cpp",
+    "TBAAMetadataTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/CrossTU/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/CrossTU/BUILD.gn
@@ -0,0 +1,20 @@
+executable("CrossTUTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/CrossTU",
+    "//clang/lib/Frontend",
+    "//clang/lib/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target:TargetsToBuild",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "CrossTranslationUnitTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Driver/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Driver/BUILD.gn
@@ -0,0 +1,21 @@
+executable("ClangDriverTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/Basic",
+    "//clang/lib/Driver",
+    "//llvm/lib/Option",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target:TargetsToBuild",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "DistroTest.cpp",
+    "ModuleCacheTest.cpp",
+    "MultilibTest.cpp",
+    "ToolChainTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
@@ -0,0 +1,34 @@
+executable("FormatTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/Basic",
+    "//clang/lib/Format",
+    "//clang/lib/Frontend",
+    "//clang/lib/Rewrite",
+    "//clang/lib/Tooling/Core",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "CleanupTest.cpp",
+    "FormatTest.cpp",
+    "FormatTestComments.cpp",
+    "FormatTestJS.cpp",
+    "FormatTestJava.cpp",
+    "FormatTestObjC.cpp",
+    "FormatTestProto.cpp",
+    "FormatTestRawStrings.cpp",
+    "FormatTestSelective.cpp",
+    "FormatTestTableGen.cpp",
+    "FormatTestTextProto.cpp",
+    "NamespaceEndCommentsFixerTest.cpp",
+    "SortImportsTestJS.cpp",
+    "SortImportsTestJava.cpp",
+    "SortIncludesTest.cpp",
+    "UsingDeclarationsSorterTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Frontend/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Frontend/BUILD.gn
@@ -0,0 +1,28 @@
+executable("FrontendTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/CodeGen",
+    "//clang/lib/Frontend",
+    "//clang/lib/FrontendTool",
+    "//clang/lib/Lex",
+    "//clang/lib/Sema",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "ASTUnitTest.cpp",
+    "CodeGenActionTest.cpp",
+    "CompilerInstanceTest.cpp",
+    "FixedPointString.cpp",
+    "FrontendActionTest.cpp",
+    "OutputStreamTest.cpp",
+    "PCHPreambleTest.cpp",
+    "ParsedSourceLocationTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Index/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Index/BUILD.gn
@@ -0,0 +1,21 @@
+executable("IndexTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/Frontend",
+    "//clang/lib/Index",
+    "//clang/lib/Lex",
+    "//clang/lib/Serialization",
+    "//clang/lib/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "IndexTests.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Lex/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Lex/BUILD.gn
@@ -0,0 +1,23 @@
+executable("LexTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/Lex",
+    "//clang/lib/Parse",
+    "//clang/lib/Sema",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "HeaderMapTest.cpp",
+    "HeaderSearchTest.cpp",
+    "LexerTest.cpp",
+    "PPCallbacksTest.cpp",
+    "PPConditionalDirectiveRecordTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Rename/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Rename/BUILD.gn
@@ -0,0 +1,31 @@
+executable("ClangRenameTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+
+  # We'd like clang/unittests/Tooling/RewriterTestContext.h in the test.
+  include_dirs = [ "../.." ]
+
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Basic",
+    "//clang/lib/Format",
+    "//clang/lib/Frontend",
+    "//clang/lib/Rewrite",
+    "//clang/lib/Tooling",
+    "//clang/lib/Tooling/Core",
+    "//clang/lib/Tooling/Refactoring",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "RenameAliasTest.cpp",
+    "RenameClassTest.cpp",
+    "RenameEnumTest.cpp",
+    "RenameFunctionTest.cpp",
+    "RenameMemberTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Rewrite/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Rewrite/BUILD.gn
@@ -0,0 +1,15 @@
+executable("RewriteTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/Rewrite",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "RewriteBufferTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Sema/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Sema/BUILD.gn
@@ -0,0 +1,21 @@
+executable("SemaTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/Basic",
+    "//clang/lib/Frontend",
+    "//clang/lib/Parse",
+    "//clang/lib/Sema",
+    "//clang/lib/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "CodeCompleteTest.cpp",
+    "ExternalSemaSourceTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/StaticAnalyzer/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/StaticAnalyzer/BUILD.gn
@@ -0,0 +1,20 @@
+executable("StaticAnalysisTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/Analysis",
+    "//clang/lib/Basic",
+    "//clang/lib/StaticAnalyzer/Core",
+    "//clang/lib/StaticAnalyzer/Frontend",
+    "//clang/lib/Tooling",
+    "//llvm/lib/Support",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "AnalyzerOptionsTest.cpp",
+    "RegisterCustomCheckersTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/Tooling/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/Tooling/BUILD.gn
@@ -0,0 +1,64 @@
+executable("ToolingTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  include_dirs = [ "." ]
+  deps = [
+    "//clang/lib/AST",
+    "//clang/lib/ASTMatchers",
+    "//clang/lib/Basic",
+    "//clang/lib/Format",
+    "//clang/lib/Frontend",
+    "//clang/lib/Lex",
+    "//clang/lib/Rewrite",
+    "//clang/lib/Tooling",
+    "//clang/lib/Tooling/Core",
+    "//clang/lib/Tooling/Refactoring",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target:TargetsToBuild",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "ASTSelectionTest.cpp",
+    "CastExprTest.cpp",
+    "CommentHandlerTest.cpp",
+    "CompilationDatabaseTest.cpp",
+    "DiagnosticsYamlTest.cpp",
+    "ExecutionTest.cpp",
+    "FixItTest.cpp",
+    "HeaderIncludesTest.cpp",
+    "LexicallyOrderedRecursiveASTVisitorTest.cpp",
+    "LookupTest.cpp",
+    "QualTypeNamesTest.cpp",
+    "RecursiveASTVisitorTestDeclVisitor.cpp",
+    "RecursiveASTVisitorTestPostOrderVisitor.cpp",
+    "RecursiveASTVisitorTestTypeLocVisitor.cpp",
+    "RecursiveASTVisitorTests/Attr.cpp",
+    "RecursiveASTVisitorTests/CXXBoolLiteralExpr.cpp",
+    "RecursiveASTVisitorTests/CXXMemberCall.cpp",
+    "RecursiveASTVisitorTests/CXXOperatorCallExprTraverser.cpp",
+    "RecursiveASTVisitorTests/Class.cpp",
+    "RecursiveASTVisitorTests/ConstructExpr.cpp",
+    "RecursiveASTVisitorTests/DeclRefExpr.cpp",
+    "RecursiveASTVisitorTests/ImplicitCtor.cpp",
+    "RecursiveASTVisitorTests/InitListExprPostOrder.cpp",
+    "RecursiveASTVisitorTests/InitListExprPostOrderNoQueue.cpp",
+    "RecursiveASTVisitorTests/InitListExprPreOrder.cpp",
+    "RecursiveASTVisitorTests/InitListExprPreOrderNoQueue.cpp",
+    "RecursiveASTVisitorTests/IntegerLiteral.cpp",
+    "RecursiveASTVisitorTests/LambdaDefaultCapture.cpp",
+    "RecursiveASTVisitorTests/LambdaExpr.cpp",
+    "RecursiveASTVisitorTests/NestedNameSpecifiers.cpp",
+    "RecursiveASTVisitorTests/ParenExpr.cpp",
+    "RecursiveASTVisitorTests/TemplateArgumentLocTraverser.cpp",
+    "RecursiveASTVisitorTests/TraversalScope.cpp",
+    "RefactoringActionRulesTest.cpp",
+    "RefactoringCallbacksTest.cpp",
+    "RefactoringTest.cpp",
+    "ReplacementsYamlTest.cpp",
+    "RewriterTest.cpp",
+    "ToolingTest.cpp",
+  ]
+  testonly = true
+}
Index: llvm/utils/gn/secondary/clang/unittests/libclang/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/clang/unittests/libclang/BUILD.gn
@@ -0,0 +1,17 @@
+executable("libclangTests") {
+  # test/Unit/lit.cfg expects unittests in CLANG_BINARY_DIR/unittest
+  output_dir = target_out_dir
+
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/tools/libclang",
+    "//llvm/utils/unittest/UnitTestMain",
+  ]
+  sources = [
+    "LibclangTest.cpp",
+  ]
+  if (host_os == "mac") {
+    ldflags = [ "-Wl,-rpath," + rebase_path("$root_out_dir/lib") ]
+  }
+  testonly = true
+}