Index: llvm/trunk/utils/gn/secondary/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/BUILD.gn
@@ -5,24 +5,11 @@
 group("default") {
   deps = [
     "//clang/test",
+    "//compiler-rt/test/hwasan",
     "//lld/test",
     "//llvm/test",
   ]
 
-  # FIXME: This should be a dependency of a test target instead of being
-  # depended on from here.
-  if (android_ndk_path != "") {
-    android_aarch64_toolchain =
-        "//llvm/utils/gn/build/toolchain:stage2_android_aarch64"
-    deps += [
-      "//compiler-rt/lib/hwasan:hwasan_shared($android_aarch64_toolchain)",
-      "//llvm/tools/llvm-symbolizer($android_aarch64_toolchain)",
-    ]
-  }
-  if (host_cpu == "x64" && host_os == "linux") {
-    deps += [ "//compiler-rt/lib/hwasan:hwasan_shared(//llvm/utils/gn/build/toolchain:stage2_unix)" ]
-  }
-
   testonly = true
 }
 
Index: llvm/trunk/utils/gn/secondary/compiler-rt/include/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/include/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/include/BUILD.gn
@@ -0,0 +1,26 @@
+import("//clang/resource_dir.gni")
+
+copy("include") {
+  sources = [
+    "sanitizer/allocator_interface.h",
+    "sanitizer/asan_interface.h",
+    "sanitizer/common_interface_defs.h",
+    "sanitizer/coverage_interface.h",
+    "sanitizer/dfsan_interface.h",
+    "sanitizer/esan_interface.h",
+    "sanitizer/hwasan_interface.h",
+    "sanitizer/linux_syscall_hooks.h",
+    "sanitizer/lsan_interface.h",
+    "sanitizer/msan_interface.h",
+    "sanitizer/netbsd_syscall_hooks.h",
+    "sanitizer/scudo_interface.h",
+    "sanitizer/tsan_interface.h",
+    "sanitizer/tsan_interface_atomic.h",
+    "xray/xray_interface.h",
+    "xray/xray_log_interface.h",
+    "xray/xray_records.h",
+  ]
+  outputs = [
+    "$clang_resource_dir/include/{{source_target_relative}}",
+  ]
+}
Index: llvm/trunk/utils/gn/secondary/compiler-rt/lib/cfi/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/lib/cfi/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/lib/cfi/BUILD.gn
@@ -0,0 +1,10 @@
+import("//clang/resource_dir.gni")
+
+copy("blacklist") {
+  sources = [
+    "cfi_blacklist.txt",
+  ]
+  outputs = [
+    "$clang_resource_dir/share/{{source_target_relative}}",
+  ]
+}
Index: llvm/trunk/utils/gn/secondary/compiler-rt/test/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/test/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/test/BUILD.gn
@@ -0,0 +1,79 @@
+import("//compiler-rt/target.gni")
+import("//compiler-rt/test/test.gni")
+import("//llvm/triples.gni")
+import("//llvm/utils/gn/build/toolchain/compiler.gni")
+import("//llvm/utils/gn/build/write_cmake_config.gni")
+import("//llvm/version.gni")
+
+write_cmake_config("lit_common_configured") {
+  input = "lit.common.configured.in"
+  output = "$target_gen_dir/lit.common.configured"
+
+  values = [
+    "LIT_SITE_CFG_IN_HEADER=## Autogenerated from $input, do not edit",
+
+    "COMPILER_RT_DEFAULT_TARGET_TRIPLE=$llvm_current_triple",
+    "COMPILER_RT_DEFAULT_TARGET_ARCH=$crt_current_target_arch",
+
+    "COMPILER_RT_TEST_COMPILER_CFLAGS=$target_flags_string",
+    "LLVM_BUILD_MODE=.",
+    "LLVM_MAIN_SRC_DIR=" + rebase_path("//llvm"),
+    "LLVM_BINARY_DIR=" + rebase_path(root_build_dir),
+    "COMPILER_RT_SOURCE_DIR=" + rebase_path("//compiler-rt"),
+
+    # This is only used by tsan to find the path to an instrumented libc++.
+    # Since we don't currently support running the tsan tests, leave it empty
+    # for now. Eventually it should probably be replaced with some mechanism
+    # where the libraries are found in a toolchain dir.
+    "COMPILER_RT_BINARY_DIR=",
+
+    # We don't currently support the multiarch runtime layout.
+    "LLVM_ENABLE_PER_TARGET_RUNTIME_DIR_PYBOOL=False",
+
+    "LLVM_TOOLS_DIR=" + rebase_path("$root_build_dir/bin"),
+    "LLVM_LIBRARY_OUTPUT_INTDIR=" + rebase_path("$root_build_dir/lib"),
+
+    "GOLD_EXECUTABLE=ld",
+    "COMPILER_RT_RESOLVED_TEST_COMPILER=" +
+        rebase_path("$root_build_dir/bin/clang"),
+    "COMPILER_RT_TEST_COMPILER_ID=Clang",
+    "PYTHON_EXECUTABLE=$python_path",
+    "COMPILER_RT_DEBUG_PYBOOL=False",
+    "COMPILER_RT_RESOLVED_LIBRARY_OUTPUT_DIR=" +
+        rebase_path(crt_current_out_dir),
+    "COMPILER_RT_EMULATOR=",
+    "COMPILER_RT_ASAN_SHADOW_SCALE=",
+    "SANITIZER_CAN_USE_CXXABI_PYBOOL=True",
+    "COMPILER_RT_HAS_LLD_PYBOOL=True",
+    "HAVE_RPC_XDR_H=0",
+    "ANDROID_SERIAL_FOR_TESTING=$android_serial_for_testing",
+  ]
+
+  if (host_cpu == "x64") {
+    values += [ "HOST_ARCH=x86_64" ]
+  } else {
+    assert(false, "unimplemented host_cpu " + host_cpu)
+  }
+
+  if (host_os == "mac") {
+    values += [ "HOST_OS=Darwin" ]
+  } else if (host_os == "linux") {
+    values += [ "HOST_OS=Linux" ]
+  } else if (host_os == "win") {
+    values += [ "HOST_OS=Windows" ]
+  } else {
+    assert(false, "unsupported host_os " + host_os)
+  }
+
+  if (current_os != "win" || llvm_enable_dia_sdk) {
+    values += [ "CAN_SYMBOLIZE=1" ]
+  } else {
+    values += [ "CAN_SYMBOLIZE=0" ]
+  }
+
+  if (current_os == "android") {
+    values += [ "ANDROID_PYBOOL=True" ]
+  } else {
+    values += [ "ANDROID_PYBOOL=False" ]
+  }
+}
Index: llvm/trunk/utils/gn/secondary/compiler-rt/test/hwasan/BUILD.gn
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/test/hwasan/BUILD.gn
+++ llvm/trunk/utils/gn/secondary/compiler-rt/test/hwasan/BUILD.gn
@@ -0,0 +1,99 @@
+import("//compiler-rt/target.gni")
+import("//compiler-rt/test/test.gni")
+import("//llvm/utils/gn/build/toolchain/compiler.gni")
+import("//llvm/utils/gn/build/write_cmake_config.gni")
+import("//llvm/version.gni")
+
+write_cmake_config("lit_site_cfg") {
+  input = "lit.site.cfg.in"
+  output = "$target_gen_dir/lit.site.cfg"
+
+  values = [
+    "LIT_SITE_CFG_IN_HEADER=## Autogenerated from $input, do not edit",
+
+    "HWASAN_TEST_CONFIG_SUFFIX=-$crt_current_target",
+    "HWASAN_TEST_TARGET_CFLAGS=$target_flags_string",
+    "HWASAN_TEST_TARGET_ARCH=$crt_current_target_arch",
+
+    "COMPILER_RT_BINARY_DIR=" + rebase_path("$root_gen_dir/compiler-rt"),
+    "HWASAN_LIT_SOURCE_DIR=" + rebase_path("."),
+  ]
+
+  if (current_os == "android") {
+    values += [ "HWASAN_ANDROID_FILES_TO_PUSH=[\"" + rebase_path(
+                    "$crt_current_out_dir/libclang_rt.hwasan-$crt_current_target.so") + "\", \"" + rebase_path(
+                    "$root_out_dir/bin/llvm-symbolizer") + "\"]" ]
+  } else {
+    values += [ "HWASAN_ANDROID_FILES_TO_PUSH=[]" ]
+  }
+}
+
+if (current_toolchain != host_toolchain) {
+  group("hwasan_toolchain") {
+    deps = [
+      ":lit_site_cfg",
+      "//compiler-rt/include($host_toolchain)",
+      "//compiler-rt/lib/cfi:blacklist($host_toolchain)",
+      "//compiler-rt/lib/hwasan:hwasan_shared",
+      "//compiler-rt/test:lit_common_configured",
+      "//llvm/utils/FileCheck($host_toolchain)",
+      "//llvm/utils/llvm-lit($host_toolchain)",
+      "//llvm/utils/not($host_toolchain)",
+    ]
+
+    # FIXME: Make the host use the stage2 llvm-symbolizer as well, for
+    # consistency. Currently lit.common.cfg sets up the sanitizer runtime to
+    # look for llvm-symbolizer in llvm_tools_dir, and also looks there for
+    # other tools which are built with the host toolchain.
+    if (current_os == host_os && current_cpu == host_cpu) {
+      deps += [ "//llvm/tools/llvm-symbolizer($host_toolchain)" ]
+    } else {
+      deps += [ "//llvm/tools/llvm-symbolizer" ]
+    }
+  }
+}
+
+supported_toolchains = []
+if (host_os == "linux" && host_cpu == "x64") {
+  supported_toolchains += [ "//llvm/utils/gn/build/toolchain:stage2_unix" ]
+}
+if (android_ndk_path != "") {
+  supported_toolchains +=
+      [ "//llvm/utils/gn/build/toolchain:stage2_android_aarch64" ]
+}
+
+group("hwasan") {
+  deps = []
+  foreach(toolchain, supported_toolchains) {
+    deps += [ ":hwasan_toolchain($toolchain)" ]
+  }
+}
+
+if (supported_toolchains != []) {
+  action("check-hwasan") {
+    script = "$root_build_dir/bin/llvm-lit"
+    if (host_os == "win") {
+      script += ".py"
+    }
+    args = [ "-sv" ]
+    foreach(toolchain, supported_toolchains) {
+      args += [ rebase_path(
+              get_label_info(":lit_site_cfg($toolchain)", "target_gen_dir"),
+              root_build_dir) ]
+    }
+    outputs = [
+      "$target_gen_dir/run-lit",  # Non-existing, so that ninja runs it each time.
+    ]
+
+    # Since check-hwasan is always dirty, //:default doesn't depend on it so that
+    # it's not part of the default ninja target.  Hence, check-hwasan shouldn't
+    # have any deps except :hwasan. so that the default target is sure to build
+    # all the deps.
+    deps = [
+      ":hwasan",
+    ]
+    testonly = true
+
+    pool = "//:console"
+  }
+}
Index: llvm/trunk/utils/gn/secondary/compiler-rt/test/test.gni
===================================================================
--- llvm/trunk/utils/gn/secondary/compiler-rt/test/test.gni
+++ llvm/trunk/utils/gn/secondary/compiler-rt/test/test.gni
@@ -0,0 +1,16 @@
+import("//llvm/utils/gn/build/toolchain/target_flags.gni")
+
+declare_args() {
+  # Specifies the serial number of the Android device to be used for testing.
+  android_serial_for_testing = ""
+}
+
+target_flags_string = ""
+
+foreach(flag,
+        target_flags + target_cflags + target_ldflags + [ "-fuse-ld=lld" ]) {
+  if (target_flags_string != "") {
+    target_flags_string += " "
+  }
+  target_flags_string += flag
+}