Hacky slashy

build/toolchain/fuchsia/BUILD.gn

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/toolchain/gcc_toolchain.gni")
+import("//build/config/fuchsia/config.gni")
+
+gcc_toolchain("x64") {
+  assert(current_cpu == "x64")
+  clang_cpu = "x86_64"
+
+  assert(host_os == "linux")
+  clang_os = "linux"
+
+  clang_name = "clang+llvm-$clang_cpu-$clang_os"
+  clang_path = fuchsia_sdk + "/$clang_name"
+  prefix = rebase_path("$clang_path/bin/", root_build_dir)
+
+  cc = "${prefix}clang"
+  cxx = "${prefix}clang++"
+  ld = cxx
+  ar = "${prefix}llvm-ar"
+
+  toolchain_args = {
+    current_cpu = "x64"
+    current_os = "fuchsia"
+  }
+}