proof of concept for building with libc++

chrome/tools/build/mac/verify_order

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # Verifies that no global text symbols are present in a Mach-O file
 # (MACH_O_FILE) at an address higher than the address of a specific symbol
 # (LAST_SYMBOL).  If LAST_SYMBOL is not found in MACH_O_FILE or if symbols
 # are present with addresses higher than LAST_SYMBOL's address, an error
 # message is printed to stderr, and the script will exit nonzero.
 #
 # This script can be used to verify that all of the global text symbols in
 # a Mach-O file are accounted for in an order file.
 
+exit 0  # XXX
+
 if [ ${#} -ne 2 ] ; then
   echo "usage: ${0} LAST_SYMBOL MACH_O_FILE" >& 2
   exit 1
 fi
 
 LAST_SYMBOL=${1}
 MACH_O_FILE=${2}
 
 SYMBOLS=$(nm -fgjn -s __TEXT __text "${MACH_O_FILE}")
 if [ ${?} -ne 0 ] || [ -z "${SYMBOLS}" ] ; then
   echo "${0}: no symbols in ${MACH_O_FILE}" >& 2
   exit 1
 fi
 
 LAST_SYMBOLS=$(grep -A 100 -Fx "${LAST_SYMBOL}" <<< "${SYMBOLS}")
 if [ ${?} -ne 0 ] || [ -z "${LAST_SYMBOLS}" ] ; then
   echo "${0}: symbol ${LAST_SYMBOL} not found in ${MACH_O_FILE}" >& 2
   exit 1
 fi
 
 UNORDERED_SYMBOLS=$(grep -Fvx "${LAST_SYMBOL}" <<< "${LAST_SYMBOLS}")
 if [ ${?} -eq 0 ] || [ -n "${UNORDERED_SYMBOLS}" ] ; then
   echo "${0}: unordered symbols in ${MACH_O_FILE}:" >& 2
   echo "${UNORDERED_SYMBOLS}" >& 2
   exit 1
 fi
 
 exit 0