text: """SCons.Defaults
  
  Builders and other things for the local site.  Here's where we'll
  duplicate the functionality of autoconf until we move it into the
  installation procedure or use something like qmconf.
  
  The code that reads the registry to find MSVC components was borrowed
  from distutils.msvccompiler.
  
  """
  
  #
  # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
  #
  # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject to
  # the following conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  #
  
  __revision__ = "src/engine/SCons/Defaults.py 3897 2009/01/13 06:45:54 scons"
  
  
  
  import os
  import os.path
  import errno
  import shutil
  import stat
  import string
  import time
  import types
  import sys
  
  import SCons.Action
  import SCons.Builder
  import SCons.CacheDir
  import SCons.Environment
  import SCons.PathList
  import SCons.Subst
  import SCons.Tool
  
  # A placeholder for a default Environment (for fetching source files
  # from source code management systems and the like).  This must be
  # initialized later, after the top-level directory is set by the calling
  # interface.
  _default_env = None
  
  # Lazily instantiate the default environment so the overhead of creating
  # it doesn't apply when it's not needed.
  def _fetch_DefaultEnvironment(*args, **kw):
      """
      Returns the already-created default construction environment.
      """
      global _default_env
      return _default_env
  
  def DefaultEnvironment(*args, **kw):
      """
      Initial public entry point for creating the default construction
      Environment.
  
      After creating the environment, we overwrite our name
      (DefaultEnvironment) with the _fetch_DefaultEnvironment() function,
      which more efficiently returns the initialized default construction
      environment without checking for its existence.
  
      (This function still exists with its _default_check because someone
      else (*cough* Script/__init__.py *cough*) may keep a reference
      to this function.  So we can't use the fully functional idiom of
      having the name originally be a something that *only* creates the
      construction environment and then overwrites the name.)
      """
      global _default_env
      if not _default_env:
          import SCons.Util
          _default_env = apply(SCons.Environment.Environment, args, kw)
          if SCons.Util.md5:
              _default_env.Decider('MD5')
          else:
              _default_env.Decider('timestamp-match')
          global DefaultEnvironment
          DefaultEnvironment = _fetch_DefaultEnvironment
          _default_env._CacheDir_path = None
      return _default_env
  
  # Emitters for setting the shared attribute on object files,
  # and an action for checking that all of the source files
  # going into a shared library are, in fact, shared.
  def StaticObjectEmitter(target, source, env):
      for tgt in target:
          tgt.attributes.shared = None
      return (target, source)
  
  def SharedObjectEmitter(target, source, env):
      for tgt in target:
          tgt.attributes.shared = 1
      return (target, source)
  
  def SharedFlagChecker(source, target, env):
      same = env.subst('$STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME')
      if same == '0' or same == '' or same == 'False':
          for src in source:
              try:
                  shared = src.attributes.shared
              except AttributeError:
                  shared = None
              if not shared:
                  raise SCons.Errors.UserError, "Source file: %s is static and is not compatible with shared target: %s" % (src, target[0])
  
  SharedCheck = SCons.Action.Action(SharedFlagChecker, None)
  
  # Some people were using these variable name before we made
  # SourceFileScanner part of the public interface.  Don't break their
  # SConscript files until we've given them some fair warning and a
  # transition period.
  CScan = SCons.Tool.CScanner
  DScan = SCons.Tool.DScanner
  LaTeXScan = SCons.Tool.LaTeXScanner
  ObjSourceScan = SCons.Tool.SourceFileScanner
  ProgScan = SCons.Tool.ProgramScanner
  
  # These aren't really tool scanners, so they don't quite belong with
  # the rest of those in Tool/__init__.py, but I'm not sure where else
  # they should go.  Leave them here for now.
  import SCons.Scanner.Dir
  DirScanner = SCons.Scanner.Dir.DirScanner()
  DirEntryScanner = SCons.Scanner.Dir.DirEntryScanner()
  
  # Actions for common languages.
  CAction = SCons.Action.Action("$CCCOM", "$CCCOMSTR")
  ShCAction = SCons.Action.Action("$SHCCCOM", "$SHCCCOMSTR")
  CXXAction = SCons.Action.Action("$CXXCOM", "$CXXCOMSTR")
  ShCXXAction = SCons.Action.Action("$SHCXXCOM", "$SHCXXCOMSTR")
  
  ASAction = SCons.Action.Action("$ASCOM", "$ASCOMSTR")
  ASPPAction = SCons.Action.Action("$ASPPCOM", "$ASPPCOMSTR")
  
  LinkAction = SCons.Action.Action("$LINKCOM", "$LINKCOMSTR")
  ShLinkAction = SCons.Action.Action("$SHLINKCOM", "$SHLINKCOMSTR")
  
  LdModuleLinkAction = SCons.Action.Action("$LDMODULECOM", "$LDMODULECOMSTR")
  
  # Common tasks that we allow users to perform in platform-independent
  # ways by creating ActionFactory instances.
  ActionFactory = SCons.Action.ActionFactory
  
  def get_paths_str(dest):
      # If dest is a list, we need to manually call str() on each element
      if SCons.Util.is_List(dest):
          elem_strs = []
          for element in dest:
              elem_strs.append('"' + str(element) + '"')
          return '[' + string.join(elem_strs, ', ') + ']'
      else:
          return '"' + str(dest) + '"'
  
  def chmod_func(dest, mode):
      SCons.Node.FS.invalidate_node_memos(dest)
      if not SCons.Util.is_List(dest):
          dest = [dest]
      for element in dest:
          os.chmod(str(element), mode)
  
  def chmod_strfunc(dest, mode):
      return 'Chmod(%s, 0%o)' % (get_paths_str(dest), mode)
  
  Chmod = ActionFactory(chmod_func, chmod_strfunc)
  
  def copy_func(dest, src):
      SCons.Node.FS.invalidate_node_memos(dest)
      if SCons.Util.is_List(src) and os.path.isdir(dest):
          for file in src:
              shutil.copy2(file, dest)
          return 0
      elif os.path.isfile(src):
          return shutil.copy2(src, dest)
      else:
          return shutil.copytree(src, dest, 1)
  
  Copy = ActionFactory(copy_func,
                       lambda dest, src: 'Copy("%s", "%s")' % (dest, src),
                       convert=str)
  
  def delete_func(dest, must_exist=0):
      SCons.Node.FS.invalidate_node_memos(dest)
      if not SCons.Util.is_List(dest):
          dest = [dest]
      for entry in dest:
          entry = str(entry)
          if not must_exist and not os.path.exists(entry):
              continue
          if not os.path.exists(entry) or os.path.isfile(entry):
              os.unlink(entry)
              continue
          else:
              shutil.rmtree(entry, 1)
              continue
  
  def delete_strfunc(dest, must_exist=0):
      return 'Delete(%s)' % get_paths_str(dest)
  
  Delete = ActionFactory(delete_func, delete_strfunc)
  
  def mkdir_func(dest):
      SCons.Node.FS.invalidate_node_memos(dest)
      if not SCons.Util.is_List(dest):
          dest = [dest]
      for entry in dest:
          try:
              os.makedirs(str(entry))
          except os.error, e:
              p = str(entry)
              if e[0] == errno.EEXIST and os.path.isdir(str(entry)):
                  pass            # not an error if already exists
              else:
                  raise
  
  Mkdir = ActionFactory(mkdir_func,
                        lambda dir: 'Mkdir(%s)' % get_paths_str(dir))
  
  def move_func(dest, src):
      SCons.Node.FS.invalidate_node_memos(dest)
      SCons.Node.FS.invalidate_node_memos(src)
      os.rename(src, dest)
  
  Move = ActionFactory(move_func,
                       lambda dest, src: 'Move("%s", "%s")' % (dest, src),
                       convert=str)
  
  def touch_func(dest):
      SCons.Node.FS.invalidate_node_memos(dest)
      if not SCons.Util.is_List(dest):
          dest = [dest]
      for file in dest:
          file = str(file)
          mtime = int(time.time())
          if os.path.exists(file):
              atime = os.path.getatime(file)
          else:
              open(file, 'w')
              atime = mtime
          os.utime(file, (atime, mtime))
  
  Touch = ActionFactory(touch_func,
                        lambda file: 'Touch(%s)' % get_paths_str(file))
  
  # Internal utility functions
  
  def _concat(prefix, list, suffix, env, f=lambda x: x, target=None, source=None):
      """
      Creates a new list from 'list' by first interpolating each element
      in the list using the 'env' dictionary and then calling f on the
      list, and finally calling _concat_ixes to concatenate 'prefix' and
      'suffix' onto each element of the list.
      """
      if not list:
          return list
  
      l = f(SCons.PathList.PathList(list).subst_path(env, target, source))
      if not l is None:
          list = l
  
      return _concat_ixes(prefix, list, suffix, env)
  
  def _concat_ixes(prefix, list, suffix, env):
      """
      Creates a new list from 'list' by concatenating the 'prefix' and
      'suffix' arguments onto each element of the list.  A trailing space
      on 'prefix' or leading space on 'suffix' will cause them to be put
      into separate list elements rather than being concatenated.
      """
  
      result = []
  
      # ensure that prefix and suffix are strings
      prefix = str(env.subst(prefix, SCons.Subst.SUBST_RAW))
      suffix = str(env.subst(suffix, SCons.Subst.SUBST_RAW))
  
      for x in list:
          if isinstance(x, SCons.Node.FS.File):
              result.append(x)
              continue
          x = str(x)
          if x:
  
              if prefix:
                  if prefix[-1] == ' ':
                      result.append(prefix[:-1])
                  elif x[:len(prefix)] != prefix:
                      x = prefix + x
  
              result.append(x)
  
              if suffix:
                  if suffix[0] == ' ':
                      result.append(suffix[1:])
                  elif x[-len(suffix):] != suffix:
                      result[-1] = result[-1]+suffix
  
      return result
  
  def _stripixes(prefix, list, suffix, stripprefixes, stripsuffixes, env, c=None):
      """
      This is a wrapper around _concat()/_concat_ixes() that checks for the
      existence of prefixes or suffixes on list elements and strips them
      where it finds them.  This is used by tools (like the GNU linker)
      that need to turn something like 'libfoo.a' into '-lfoo'.
      """
      
      if not list:
          return list
  
      if not callable(c):
          env_c = env['_concat']
          if env_c != _concat and callable(env_c):
              # There's a custom _concat() method in the construction
              # environment, and we've allowed people to set that in
              # the past (see test/custom-concat.py), so preserve the
              # backwards compatibility.
              c = env_c
          else:
              c = _concat_ixes
      
      stripprefixes = map(env.subst, SCons.Util.flatten(stripprefixes))
      stripsuffixes = map(env.subst, SCons.Util.flatten(stripsuffixes))
  
      stripped = []
      for l in SCons.PathList.PathList(list).subst_path(env, None, None):
          if isinstance(l, SCons.Node.FS.File):
              stripped.append(l)
              continue
  
          if not SCons.Util.is_String(l):
              l = str(l)
  
          for stripprefix in stripprefixes:
              lsp = len(stripprefix)
              if l[:lsp] == stripprefix:
                  l = l[lsp:]
                  # Do not strip more than one prefix
                  break
  
          for stripsuffix in stripsuffixes:
              lss = len(stripsuffix)
              if l[-lss:] == stripsuffix:
                  l = l[:-lss]
                  # Do not strip more than one suffix
                  break
  
          stripped.append(l)
  
      return c(prefix, stripped, suffix, env)
  
  def _defines(prefix, defs, suffix, env, c=_concat_ixes):
      """A wrapper around _concat_ixes that turns a list or string
      into a list of C preprocessor command-line definitions.
      """
      if SCons.Util.is_List(defs):
          l = []
          for d in defs:
              if SCons.Util.is_List(d) or type(d) is types.TupleType:
                  l.append(str(d[0]) + '=' + str(d[1]))
              else:
                  l.append(str(d))
      elif SCons.Util.is_Dict(defs):
          # The items in a dictionary are stored in random order, but
          # if the order of the command-line options changes from
          # invocation to invocation, then the signature of the command
          # line will change and we'll get random unnecessary rebuilds.
          # Consequently, we have to sort the keys to ensure a
          # consistent order...
          l = []
          keys = defs.keys()
          keys.sort()
          for k in keys:
              v = defs[k]
              if v is None:
                  l.append(str(k))
              else:
                  l.append(str(k) + '=' + str(v))
      else:
          l = [str(defs)]
      return c(prefix, env.subst_path(l), suffix, env)
      
  class NullCmdGenerator:
      """This is a callable class that can be used in place of other
      command generators if you don't want them to do anything.
  
      The __call__ method for this class simply returns the thing
      you instantiated it with.
  
      Example usage:
      env["DO_NOTHING"] = NullCmdGenerator
      env["LINKCOM"] = "${DO_NOTHING('$LINK $SOURCES $TARGET')}"
      """
  
      def __init__(self, cmd):
          self.cmd = cmd
  
      def __call__(self, target, source, env, for_signature=None):
          return self.cmd
  
  class Variable_Method_Caller:
      """A class for finding a construction variable on the stack and
      calling one of its methods.
  
      We use this to support "construction variables" in our string
      eval()s that actually stand in for methods--specifically, use
      of "RDirs" in call to _concat that should actually execute the
      "TARGET.RDirs" method.  (We used to support this by creating a little
      "build dictionary" that mapped RDirs to the method, but this got in
      the way of Memoizing construction environments, because we had to
      create new environment objects to hold the variables.)
      """
      def __init__(self, variable, method):
          self.variable = variable
          self.method = method
      def __call__(self, *args, **kw):
          try: 1/0
          except ZeroDivisionError: 
              # Don't start iterating with the current stack-frame to
              # prevent creating reference cycles (f_back is safe).
              frame = sys.exc_info()[2].tb_frame.f_back
          variable = self.variable
          while frame:
              if frame.f_locals.has_key(variable):
                  v = frame.f_locals[variable]
                  if v:
                      method = getattr(v, self.method)
                      return apply(method, args, kw)
              frame = frame.f_back
          return None
  
  ConstructionEnvironment = {
      'BUILDERS'      : {},
      'SCANNERS'      : [],
      'CONFIGUREDIR'  : '#/.sconf_temp',
      'CONFIGURELOG'  : '#/config.log',
      'CPPSUFFIXES'   : SCons.Tool.CSuffixes,
      'DSUFFIXES'     : SCons.Tool.DSuffixes,
      'ENV'           : {},
      'IDLSUFFIXES'   : SCons.Tool.IDLSuffixes,
      'LATEXSUFFIXES' : SCons.Tool.LaTeXSuffixes,
      '_concat'       : _concat,
      '_defines'      : _defines,
      '_stripixes'    : _stripixes,
      '_LIBFLAGS'     : '${_concat(LIBLINKPREFIX, LIBS, LIBLINKSUFFIX, __env__)}',
      '_LIBDIRFLAGS'  : '$( ${_concat(LIBDIRPREFIX, LIBPATH, LIBDIRSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)',
      '_CPPINCFLAGS'  : '$( ${_concat(INCPREFIX, CPPPATH, INCSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)',
      '_CPPDEFFLAGS'  : '${_defines(CPPDEFPREFIX, CPPDEFINES, CPPDEFSUFFIX, __env__)}',
      'TEMPFILE'      : NullCmdGenerator,
      'Dir'           : Variable_Method_Caller('TARGET', 'Dir'),
      'Dirs'          : Variable_Method_Caller('TARGET', 'Dirs'),
      'File'          : Variable_Method_Caller('TARGET', 'File'),
      'RDirs'         : Variable_Method_Caller('TARGET', 'RDirs'),
  }
  