text: """
  mbed SDK
  Copyright (c) 2011-2013 ARM Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  """
  from os.path import join, commonprefix, realpath
  from os import getenv
  
  # Conventions about the directory structure
  from tools.settings import ROOT, BUILD_DIR
  
  # Allow overriding some of the build parameters using environment variables
  BUILD_DIR = getenv("MBED_BUILD_DIR") or BUILD_DIR
  
  # Embedded Libraries Sources
  LIB_DIR = join(ROOT, "features/unsupported")
  
  TOOLS = join(ROOT, "tools")
  TOOLS_DATA = join(TOOLS, "data")
  TOOLS_BOOTLOADERS = join(TOOLS, "bootloaders")
  
  # mbed libraries
  MBED_HEADER = join(ROOT, "mbed.h")
  MBED_DRIVERS = join(ROOT, "drivers")
  MBED_PLATFORM = join(ROOT, "platform")
  MBED_HAL = join(ROOT, "hal")
  
  MBED_CMSIS_PATH = join(ROOT, "cmsis")
  MBED_TARGETS_PATH = join(ROOT, "targets")
  
  MBED_LIBRARIES = join(BUILD_DIR, "mbed")
  MBED_LIBRARIES_DRIVERS = join(MBED_LIBRARIES, "drivers")
  MBED_LIBRARIES_PLATFORM = join(MBED_LIBRARIES, "platform")
  MBED_LIBRARIES_HAL = join(MBED_LIBRARIES, "hal")
  
  MBED_CONFIG_FILE = join(ROOT, "platform/mbed_lib.json")
  
  # Tests
  TEST_DIR = join(LIB_DIR, "tests")
  HOST_TESTS = join(ROOT, "tools", "host_tests")
  
  # mbed RPC
  MBED_RPC = join(LIB_DIR, "rpc")
  
  RPC_LIBRARY = join(BUILD_DIR, "rpc")
  
  # DSP
  DSP = join(LIB_DIR, "dsp")
  DSP_CMSIS = join(DSP, "cmsis_dsp")
  DSP_ABSTRACTION = join(DSP, "dsp")
  DSP_LIBRARIES = join(BUILD_DIR, "dsp")
  
  # USB Device
  USB = join(LIB_DIR, "USBDevice")
  USB_LIBRARIES = join(BUILD_DIR, "usb")
  
  # Export
  EXPORT_DIR = join(BUILD_DIR, "export")
  EXPORT_WORKSPACE = join(EXPORT_DIR, "workspace")
  EXPORT_TMP = join(EXPORT_DIR, ".temp")
  
  # CppUtest library
  CPPUTEST_DIR = join(ROOT, "..")
  CPPUTEST_SRC = join(CPPUTEST_DIR, "cpputest", "src", "CppUTest")
  CPPUTEST_INC = join(CPPUTEST_DIR, "cpputest", "include")
  CPPUTEST_INC_EXT = join(CPPUTEST_DIR, "cpputest", "include", "CppUTest")
  # Platform dependant code is here (for armcc compiler)
  CPPUTEST_PLATFORM_SRC = join(CPPUTEST_DIR, "cpputest", "src", "Platforms",
                               "armcc")
  CPPUTEST_PLATFORM_INC = join(CPPUTEST_DIR, "cpputest", "include", "Platforms",
                               "armcc")
  # Function 'main' used to run all compiled UTs
  CPPUTEST_TESTRUNNER_SCR = join(TEST_DIR, "utest", "testrunner")
  CPPUTEST_TESTRUNNER_INC = join(TEST_DIR, "utest", "testrunner")
  
  CPPUTEST_LIBRARY = join(BUILD_DIR, "cpputest")
  
  
  def is_relative_to_root(dirs):
      if not isinstance(dirs, list):
          dirs = [dirs]
      dirs = [realpath(d) for d in dirs]
      out = commonprefix(dirs + [ROOT])
      return out == ROOT
  