build: Fix getting available memory on mac

build/toolchain/get_concurrent_links.py

 # Copyright 2014 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 computs the number of concurrent links we want to run in the build
 # as a function of machine spec. It's based on GetDefaultConcurrentLinks in GYP.
 
 import optparse
 import os
 import re
@@ skipping 24 matching lines @@
     if os.path.exists("/proc/meminfo"):
       with open("/proc/meminfo") as meminfo:
         memtotal_re = re.compile(r'^MemTotal:\s*(\d*)\s*kB')
         for line in meminfo:
           match = memtotal_re.match(line)
           if not match:
             continue
           return float(match.group(1)) * 2**10
   elif sys.platform == 'darwin':
     try:
-      avail_bytes = int(subprocess.check_output(['sysctl', '-n', 'hw.memsize']))
+      return int(subprocess.check_output(['sysctl', '-n', 'hw.memsize']))
     except Exception:
       return 0
   # TODO(scottmg): Implement this for other platforms.
   return 0
 
 
 def _GetDefaultConcurrentLinks(mem_per_link_gb, reserve_mem_gb):
   # Inherit the legacy environment variable for people that have set it in GYP.
   pool_size = int(os.getenv('GYP_LINK_CONCURRENCY', 0))
   if pool_size:
@@ skipping 12 matching lines @@
   parser.add_option('--reserve_mem_gb', action="store", type="int", default=0)
   parser.disable_interspersed_args()
   options, args = parser.parse_args()
 
   print _GetDefaultConcurrentLinks(options.mem_per_link_gb,
                                    options.reserve_mem_gb)
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())