GN: Harmonize ARM compiler settings with GYP

build/config/sysroot.gni

 # Copyright (c) 2013 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.
 
 # This header file defines the "sysroot" variable which is the absolute path
 # of the sysroot. If no sysroot applies, the variable will be an empty string.
 
 import("//build/config/chrome_build.gni")
 
 declare_args() {
@@ skipping 27 matching lines @@
   if (current_cpu == "x64") {
     sysroot = rebase_path("//build/linux/debian_wheezy_amd64-sysroot")
   } else if (current_cpu == "x86") {
     sysroot = rebase_path("//build/linux/debian_wheezy_i386-sysroot")
   } else {
     # Any other builds don't use a sysroot.
     sysroot = ""
   }
 } else if (is_linux && !is_chromeos) {
   if (current_cpu == "mipsel") {
     sysroot = rebase_path("//mipsel-sysroot/sysroot")

[Sam Clegg, 2015/09/19 08:40:06]

Looks like the mips path is out-of-date too, but maybe thats a different CL?

+  } else if (current_cpu == "arm") {
+    sysroot = rebase_path("//build/linux/debian_wheezy_arm-sysroot")
   } else {
     sysroot = ""
   }
 } else if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 
   sysroot = mac_sdk_path
 } else if (is_ios) {
   import("//build/config/ios/ios_sdk.gni")
   sysroot = ios_sdk_path
 } else {
   sysroot = ""
 }