Index: llvm/trunk/utils/gn/secondary/clang/runtimes.gni
===================================================================
--- llvm/trunk/utils/gn/secondary/clang/runtimes.gni
+++ llvm/trunk/utils/gn/secondary/clang/runtimes.gni
@@ -0,0 +1,13 @@
+import("//clang/resource_dir.gni")
+import("//llvm/triples.gni")
+
+declare_args() {
+  # Use target triple as the name of the runtimes directory.
+  clang_enable_per_target_runtime_dir = false
+}
+
+if (clang_enable_per_target_runtime_dir) {
+  runtimes_dir = "$clang_resource_dir/$llvm_target_triple/lib"
+} else {
+  runtimes_dir = "$root_build_dir/lib"
+}
Index: llvm/trunk/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/lib/builtins/BUILD.gn
@@ -11,7 +11,7 @@
 
 static_library("builtins") {
   output_dir = crt_current_out_dir
-  output_name = "clang_rt.builtins-$crt_current_target"
+  output_name = "clang_rt.builtins$crt_current_target_suffix"
   complete_static_lib = true
   cflags = [
     "-fPIC",
Index: llvm/trunk/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/lib/hwasan/BUILD.gn
@@ -16,10 +16,10 @@
     "--version-list",
     "--extra",
     rebase_path(sources[0], root_build_dir),
-    rebase_path("$crt_current_out_dir/libclang_rt.hwasan-$crt_current_target.a",
+    rebase_path("$crt_current_out_dir/libclang_rt.hwasan$crt_current_target_suffix.a",
                 root_build_dir),
     rebase_path(
-        "$crt_current_out_dir/libclang_rt.hwasan_cxx-$crt_current_target.a",
+        "$crt_current_out_dir/libclang_rt.hwasan_cxx$crt_current_target_suffix.a",
         root_build_dir),
     "-o",
     rebase_path(outputs[0], root_build_dir),
@@ -75,7 +75,7 @@
 
 static_library("hwasan") {
   output_dir = crt_current_out_dir
-  output_name = "clang_rt.hwasan-$crt_current_target"
+  output_name = "clang_rt.hwasan$crt_current_target_suffix"
   complete_static_lib = true
   configs -= [
     "//llvm/utils/gn/build:llvm_code",
@@ -89,7 +89,7 @@
 
 static_library("hwasan_cxx") {
   output_dir = crt_current_out_dir
-  output_name = "clang_rt.hwasan_cxx-$crt_current_target"
+  output_name = "clang_rt.hwasan_cxx$crt_current_target_suffix"
   complete_static_lib = true
   configs -= [
     "//llvm/utils/gn/build:llvm_code",
@@ -103,7 +103,7 @@
 
 shared_library("hwasan_shared") {
   output_dir = crt_current_out_dir
-  output_name = "clang_rt.hwasan-$crt_current_target"
+  output_name = "clang_rt.hwasan$crt_current_target_suffix"
   configs -= [ "//llvm/utils/gn/build:llvm_code" ]
   configs += [ "//llvm/utils/gn/build:crt_code" ]
   deps = [
Index: llvm/trunk/utils/gn/secondary/compiler-rt/target.gni
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/target.gni
+++ llvm/trunk/utils/gn/secondary/compiler-rt/target.gni
@@ -1,10 +1,5 @@
 import("//clang/resource_dir.gni")
-
-if (current_os == "linux" || current_os == "android") {
-  crt_current_out_dir = "$clang_resource_dir/lib/linux"
-} else {
-  assert(false, "unimplemented current_os " + current_os)
-}
+import("//clang/runtimes.gni")
 
 if (current_cpu == "x86") {
   crt_current_target_arch = "i386"
@@ -16,7 +11,17 @@
   assert(false, "unimplemented current_cpu " + current_cpu)
 }
 
-crt_current_target = crt_current_target_arch
-if (current_os == "android") {
-  crt_current_target += "-android"
+if (clang_enable_per_target_runtime_dir) {
+  crt_current_out_dir = runtimes_dir
+
+  crt_current_target_suffix = ""
+} else if (current_os == "linux" || current_os == "android") {
+  crt_current_out_dir = "$clang_resource_dir/lib/linux"
+
+  crt_current_target_suffix = "-$crt_current_target_arch"
+  if (current_os == "android") {
+    crt_current_target_suffix += "-android"
+  }
+} else {
+  assert(false, "unimplemented current_os " + current_os)
 }
Index: llvm/trunk/utils/gn/secondary/compiler-rt/test/hwasan/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/test/hwasan/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/test/hwasan/BUILD.gn
@@ -11,7 +11,7 @@
   values = [
     "LIT_SITE_CFG_IN_HEADER=## Autogenerated from $input, do not edit",
 
-    "HWASAN_TEST_CONFIG_SUFFIX=-$crt_current_target",
+    "HWASAN_TEST_CONFIG_SUFFIX=$crt_current_target_suffix",
     "HWASAN_TEST_TARGET_CFLAGS=$target_flags_string",
     "HWASAN_TEST_TARGET_ARCH=$crt_current_target_arch",
 
@@ -21,7 +21,7 @@
 
   if (current_os == "android") {
     values += [ "HWASAN_ANDROID_FILES_TO_PUSH=[\"" + rebase_path(
-                    "$crt_current_out_dir/libclang_rt.hwasan-$crt_current_target.so") + "\", \"" + rebase_path(
+                    "$crt_current_out_dir/libclang_rt.hwasan$crt_current_target_suffix.so") + "\", \"" + rebase_path(
                     "$root_out_dir/bin/llvm-symbolizer") + "\"]" ]
   } else {
     values += [ "HWASAN_ANDROID_FILES_TO_PUSH=[]" ]