Index: llvm/utils/gn/secondary/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/BUILD.gn
+++ llvm/utils/gn/secondary/BUILD.gn
@@ -1,5 +1,6 @@
 group("default") {
   deps = [
+    "//llvm/lib/LTO",
     "//llvm/tools/llc",
     "//llvm/tools/llvm-undname",
   ]
Index: llvm/utils/gn/secondary/llvm/lib/LTO/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/LTO/BUILD.gn
@@ -0,0 +1,32 @@
+static_library("LTO") {
+  output_name = "LLVMLTO"
+  deps = [
+    "//llvm/include/llvm/Config:config",
+    "//llvm/lib/Analysis",
+    "//llvm/lib/Bitcode/Reader",
+    "//llvm/lib/Bitcode/Writer",
+    "//llvm/lib/CodeGen",
+    "//llvm/lib/IR",
+    "//llvm/lib/Linker",
+    "//llvm/lib/MC",
+    "//llvm/lib/Object",
+    "//llvm/lib/Passes",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target",
+    "//llvm/lib/Transforms/AggressiveInstCombine",
+    "//llvm/lib/Transforms/IPO",
+    "//llvm/lib/Transforms/InstCombine",
+    "//llvm/lib/Transforms/ObjCARC",
+    "//llvm/lib/Transforms/Scalar",
+    "//llvm/lib/Transforms/Utils",
+  ]
+  sources = [
+    "Caching.cpp",
+    "LTO.cpp",
+    "LTOBackend.cpp",
+    "LTOCodeGenerator.cpp",
+    "LTOModule.cpp",
+    "ThinLTOCodeGenerator.cpp",
+    "UpdateCompilerUsed.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/lib/Linker/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/Linker/BUILD.gn
@@ -0,0 +1,12 @@
+static_library("Linker") {
+  output_name = "LLVMLinker"
+  deps = [
+    "//llvm/lib/IR",
+    "//llvm/lib/Support",
+    "//llvm/lib/Transforms/Utils",
+  ]
+  sources = [
+    "IRMover.cpp",
+    "LinkModules.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/lib/Passes/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/Passes/BUILD.gn
@@ -0,0 +1,22 @@
+static_library("Passes") {
+  output_name = "LLVMPasses"
+  deps = [
+    "//llvm/lib/Analysis",
+    "//llvm/lib/CodeGen",
+    "//llvm/lib/IR",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target",
+    "//llvm/lib/Transforms/AggressiveInstCombine",
+    "//llvm/lib/Transforms/IPO",
+    "//llvm/lib/Transforms/InstCombine",
+    "//llvm/lib/Transforms/Instrumentation",
+    "//llvm/lib/Transforms/Scalar",
+    "//llvm/lib/Transforms/Utils",
+    "//llvm/lib/Transforms/Vectorize",
+  ]
+  sources = [
+    "PassBuilder.cpp",
+    "PassPlugin.cpp",
+    "StandardInstrumentations.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/lib/Transforms/IPO/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/Transforms/IPO/BUILD.gn
@@ -0,0 +1,58 @@
+static_library("IPO") {
+  output_name = "LLVMipo"
+  deps = [
+    "//llvm/lib/Analysis",
+    "//llvm/lib/Bitcode/Reader",
+    "//llvm/lib/Bitcode/Writer",
+    "//llvm/lib/IR",
+    "//llvm/lib/IRReader",
+    "//llvm/lib/Linker",
+    "//llvm/lib/Object",
+    "//llvm/lib/ProfileData",
+    "//llvm/lib/Support",
+    "//llvm/lib/Transforms/AggressiveInstCombine",
+    "//llvm/lib/Transforms/InstCombine",
+    "//llvm/lib/Transforms/Instrumentation",
+    "//llvm/lib/Transforms/Scalar",
+    "//llvm/lib/Transforms/Utils",
+    "//llvm/lib/Transforms/Vectorize",
+  ]
+  sources = [
+    "AlwaysInliner.cpp",
+    "ArgumentPromotion.cpp",
+    "BarrierNoopPass.cpp",
+    "BlockExtractor.cpp",
+    "CalledValuePropagation.cpp",
+    "ConstantMerge.cpp",
+    "CrossDSOCFI.cpp",
+    "DeadArgumentElimination.cpp",
+    "ElimAvailExtern.cpp",
+    "ExtractGV.cpp",
+    "ForceFunctionAttrs.cpp",
+    "FunctionAttrs.cpp",
+    "FunctionImport.cpp",
+    "GlobalDCE.cpp",
+    "GlobalOpt.cpp",
+    "GlobalSplit.cpp",
+    "HotColdSplitting.cpp",
+    "IPConstantPropagation.cpp",
+    "IPO.cpp",
+    "InferFunctionAttrs.cpp",
+    "InlineSimple.cpp",
+    "Inliner.cpp",
+    "Internalize.cpp",
+    "LoopExtractor.cpp",
+    "LowerTypeTests.cpp",
+    "MergeFunctions.cpp",
+    "PartialInlining.cpp",
+    "PassManagerBuilder.cpp",
+    "PruneEH.cpp",
+    "SCCP.cpp",
+    "SampleProfile.cpp",
+    "StripDeadPrototypes.cpp",
+    "StripSymbols.cpp",
+    "SyntheticCountsPropagation.cpp",
+    "ThinLTOBitcodeWriter.cpp",
+    "WholeProgramDevirt.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/lib/Transforms/Instrumentation/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/Transforms/Instrumentation/BUILD.gn
@@ -0,0 +1,29 @@
+static_library("Instrumentation") {
+  output_name = "LLVMInstrumentation"
+  deps = [
+    "//llvm/lib/Analysis",
+    "//llvm/lib/IR",
+    "//llvm/lib/MC",
+    "//llvm/lib/ProfileData",
+    "//llvm/lib/Support",
+    "//llvm/lib/Transforms/Utils",
+  ]
+  sources = [
+    "AddressSanitizer.cpp",
+    "BoundsChecking.cpp",
+    "CGProfile.cpp",
+    "ControlHeightReduction.cpp",
+    "DataFlowSanitizer.cpp",
+    "EfficiencySanitizer.cpp",
+    "GCOVProfiling.cpp",
+    "HWAddressSanitizer.cpp",
+    "IndirectCallPromotion.cpp",
+    "InstrProfiling.cpp",
+    "Instrumentation.cpp",
+    "MemorySanitizer.cpp",
+    "PGOInstrumentation.cpp",
+    "PGOMemOPSizeOpt.cpp",
+    "SanitizerCoverage.cpp",
+    "ThreadSanitizer.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/lib/Transforms/ObjCARC/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/Transforms/ObjCARC/BUILD.gn
@@ -0,0 +1,20 @@
+static_library("ObjCARC") {
+  output_name = "LLVMObjCARCOpts"
+  deps = [
+    "//llvm/lib/Analysis",
+    "//llvm/lib/IR",
+    "//llvm/lib/Support",
+    "//llvm/lib/Transforms/Utils",
+  ]
+  sources = [
+    "DependencyAnalysis.cpp",
+    "ObjCARC.cpp",
+    "ObjCARCAPElim.cpp",
+    "ObjCARCContract.cpp",
+    "ObjCARCExpand.cpp",
+    "ObjCARCOpts.cpp",
+    "ProvenanceAnalysis.cpp",
+    "ProvenanceAnalysisEvaluator.cpp",
+    "PtrState.cpp",
+  ]
+}