Make the ninja generator handle symlinked paths correctly.

pylib/gyp/generator/ninja.py

 # Copyright (c) 2013 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import copy
 import hashlib
 import json
 import multiprocessing
 import os.path
@@ skipping 1654 matching lines @@
 
 def CommandWithWrapper(cmd, wrappers, prog):
   wrapper = wrappers.get(cmd, '')
   if wrapper:
     return wrapper + ' ' + prog
   return prog
 
 
 def GetDefaultConcurrentLinks():
   """Returns a best-guess for a number of concurrent links."""
-  pool_size = int(os.getenv('GYP_LINK_CONCURRENCY', 0))
+  pool_size = int(os.environ.get('GYP_LINK_CONCURRENCY', 0))
   if pool_size:
     return pool_size
 
   if sys.platform in ('win32', 'cygwin'):
     import ctypes
 
     class MEMORYSTATUSEX(ctypes.Structure):
       _fields_ = [
         ("dwLength", ctypes.c_ulong),
         ("dwMemoryLoad", ctypes.c_ulong),
         ("ullTotalPhys", ctypes.c_ulonglong),
         ("ullAvailPhys", ctypes.c_ulonglong),
         ("ullTotalPageFile", ctypes.c_ulonglong),
         ("ullAvailPageFile", ctypes.c_ulonglong),
         ("ullTotalVirtual", ctypes.c_ulonglong),
         ("ullAvailVirtual", ctypes.c_ulonglong),
         ("sullAvailExtendedVirtual", ctypes.c_ulonglong),
       ]
 
     stat = MEMORYSTATUSEX()
     stat.dwLength = ctypes.sizeof(stat)
     ctypes.windll.kernel32.GlobalMemoryStatusEx(ctypes.byref(stat))
 
     # VS 2015 uses 20% more working set than VS 2013 and can consume all RAM
     # on a 64 GB machine.
     mem_limit = max(1, stat.ullTotalPhys / (5 * (2 ** 30)))  # total / 5GB
-    hard_cap = max(1, int(os.getenv('GYP_LINK_CONCURRENCY_MAX', 2**32)))
+    hard_cap = max(1, int(os.environ.get('GYP_LINK_CONCURRENCY_MAX', 2**32)))
     return min(mem_limit, hard_cap)
   elif sys.platform.startswith('linux'):
     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
           # Allow 8Gb per link on Linux because Gold is quite memory hungry
@@ skipping 557 matching lines @@
 
     this_make_global_settings = data[build_file].get('make_global_settings', [])
     assert make_global_settings == this_make_global_settings, (
         "make_global_settings needs to be the same for all targets. %s vs. %s" %
         (this_make_global_settings, make_global_settings))
 
     spec = target_dicts[qualified_target]
     if flavor == 'mac':
       gyp.xcode_emulation.MergeGlobalXcodeSettingsToSpec(data[build_file], spec)
 
-    build_file = gyp.common.RelativePath(build_file, options.toplevel_dir)
+    # If build_file is a symlink, we must not follow it because there's a chance
+    # it could point to a path above toplevel_dir, and we cannot correctly deal
+    # with that case at the moment.
+    build_file = gyp.common.RelativePath(build_file, options.toplevel_dir,
+                                         False)
 
     qualified_target_for_hash = gyp.common.QualifiedTarget(build_file, name,
                                                            toolset)
     hash_for_rules = hashlib.md5(qualified_target_for_hash).hexdigest()
 
     base_path = os.path.dirname(build_file)
     obj = 'obj'
     if toolset != 'target':
       obj += '.' + toolset
     output_file = os.path.join(obj, base_path, name + '.ninja')
@@ skipping 93 matching lines @@
           arglists.append(
               (target_list, target_dicts, data, params, config_name))
         pool.map(CallGenerateOutputForConfig, arglists)
       except KeyboardInterrupt, e:
         pool.terminate()
         raise e
     else:
       for config_name in config_names:
         GenerateOutputForConfig(target_list, target_dicts, data, params,
                                 config_name)