Work on GN toolchain definitions and build

build/toolchain/linux/find_android_compilers.py

+# Copyright 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 script locates the Android compilers given the bin directory of the
+# android toolchain.
+
+import glob
+import subprocess
+import sys
+
+if len(sys.argv) != 2:
+  print "Error: expecting one argument of the android toolchain dir."
+  sys.exit(1)
+
+# TODO(brettw) this logic seems like a bad idea. It was copied from
+# common.gypi. It seems like the toolchain should just know the name given the
+# current platform rather than having to rely on glob.
+android_toolchain = sys.argv[1]
+cc = glob.glob(android_toolchain + "/*-gcc")
+cxx = glob.glob(android_toolchain + "/*-g++")
+if len(cc) != 1 or len(cxx) != 1:
+  print "Either none or more than one matching compiler."
+  sys.exit(1)
+
+# Get the host compilers from the current path.
+which_gcc = subprocess.check_output(["which gcc"], shell=True).strip()
+which_gxx = subprocess.check_output(["which g++"], shell=True).strip()
+
+print ('["' + cc[0] + '","' + cxx[0] + '","' + which_gcc + '","' +
+       which_gxx + '"]')