Index: llvm/utils/gn/secondary/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/BUILD.gn
+++ llvm/utils/gn/secondary/BUILD.gn
@@ -5,6 +5,9 @@
   deps = [
     "//clang/test",
     "//lld/test",
+    "//llvm/tools/llvm-exegesis",
+    "//llvm/tools/llvm-extract",
+    "//llvm/tools/llvm-link",
     "//llvm/tools/llvm-mca",
     "//llvm/tools/llvm-mt",
     "//llvm/tools/llvm-rc",
Index: llvm/utils/gn/secondary/llvm/lib/ExecutionEngine/MCJIT/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/ExecutionEngine/MCJIT/BUILD.gn
@@ -0,0 +1,14 @@
+static_library("MCJIT") {
+  output_name = "LLVMMCJIT"
+  deps = [
+    "//llvm/lib/ExecutionEngine",
+    "//llvm/lib/ExecutionEngine/RuntimeDyld",
+    "//llvm/lib/IR",
+    "//llvm/lib/Object",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target",
+  ]
+  sources = [
+    "MCJIT.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/BUILD.gn
@@ -0,0 +1,15 @@
+executable("llvm-exegesis") {
+  deps = [
+    "lib",
+    "//llvm/lib/CodeGen",
+    "//llvm/lib/ExecutionEngine",
+    "//llvm/lib/ExecutionEngine/MCJIT",
+    "//llvm/lib/MC",
+    "//llvm/lib/Object",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target:NativeTarget",
+  ]
+  sources = [
+    "llvm-exegesis.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/lib/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/lib/BUILD.gn
@@ -0,0 +1,41 @@
+import("//llvm/lib/Target/targets.gni")
+
+static_library("lib") {
+  output_name = "LLVMExegesis"
+  deps = [
+    "//llvm/lib/Analysis",
+    "//llvm/lib/CodeGen",
+    "//llvm/lib/ExecutionEngine",
+    "//llvm/lib/ExecutionEngine/MCJIT",
+    "//llvm/lib/IR",
+    "//llvm/lib/MC",
+    "//llvm/lib/Object",
+    "//llvm/lib/ObjectYAML",
+    "//llvm/lib/Support",
+  ]
+  sources = [
+    "Analysis.cpp",
+    "Assembler.cpp",
+    "BenchmarkResult.cpp",
+    "BenchmarkRunner.cpp",
+    "Clustering.cpp",
+    "CodeTemplate.cpp",
+    "Latency.cpp",
+    "LlvmState.cpp",
+    "MCInstrDescView.cpp",
+    "PerfHelper.cpp",
+    "RegisterAliasing.cpp",
+    "RegisterValue.cpp",
+    "SnippetGenerator.cpp",
+    "Target.cpp",
+    "Uops.cpp",
+  ]
+
+  # FIXME: Add this once llvm/lib/Target/AArch64 exists.
+  #if (llvm_build_AArch64) {
+  #  deps += [ "AArch64" ]
+  #}
+  if (llvm_build_X86) {
+    deps += [ "X86" ]
+  }
+}
Index: llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/lib/X86/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/lib/X86/BUILD.gn
@@ -0,0 +1,21 @@
+import("//llvm/utils/TableGen/tablegen.gni")
+
+tablegen("X86GenExegesis") {
+  args = [ "-gen-exegesis" ]
+  td_file = "//llvm/lib/Target/X86/X86.td"
+}
+
+static_library("X86") {
+  output_name = "LLVMExegesisX86"
+  deps = [
+    ":X86GenExegesis",
+
+    # Exegesis reaches inside the Target/X86 tablegen internals and must
+    # depend on this Target/X86-internal build target.
+    "//llvm/lib/Target/X86/MCTargetDesc",
+  ]
+  sources = [
+    "Target.cpp",
+  ]
+  include_dirs = [ "//llvm/lib/Target/X86" ]
+}
Index: llvm/utils/gn/secondary/llvm/tools/llvm-extract/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/tools/llvm-extract/BUILD.gn
@@ -0,0 +1,12 @@
+executable("llvm-extract") {
+  deps = [
+    "//llvm/lib/Bitcode/Writer",
+    "//llvm/lib/IR",
+    "//llvm/lib/IRReader",
+    "//llvm/lib/Support",
+    "//llvm/lib/Transforms/IPO",
+  ]
+  sources = [
+    "llvm-extract.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/tools/llvm-link/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/tools/llvm-link/BUILD.gn
@@ -0,0 +1,16 @@
+executable("llvm-link") {
+  deps = [
+    "//llvm/lib/Bitcode/Reader",
+    "//llvm/lib/Bitcode/Writer",
+    "//llvm/lib/IR",
+    "//llvm/lib/IRReader",
+    "//llvm/lib/Linker",
+    "//llvm/lib/Object",
+    "//llvm/lib/Support",
+    "//llvm/lib/Transforms/IPO",
+    "//llvm/lib/Transforms/Utils",
+  ]
+  sources = [
+    "llvm-link.cpp",
+  ]
+}