Dropping in software construction toolkit.

site_scons/site_tools/distcc.py

+#!/usr/bin/python2.4
+# Copyright 2008, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Distcc support for SCons.
+
+Since this modifies the C compiler strings, it must be specified after the
+compiler tool in the tool list.
+
+Distcc support can be enabled by specifying --distcc on the SCons command
+line.
+"""
+
+
+import optparse
+import os
+from SCons.compat._scons_optparse import OptionConflictError
+import SCons.Script
+
+
+def generate(env):
+  # NOTE: SCons requires the use of this name, which fails gpylint.
+  """SCons entry point for this tool."""
+  if not env.Detect('distcc'):
+    return
+
+  try:
+    SCons.Script.AddOption(
+        '--distcc',
+        dest='distcc',
+        action='store_true',
+        help='enable distcc support')
+    SCons.Script.Help('  --distcc                    Enable distcc suport.\n')
+
+  except (OptionConflictError, optparse.OptionConflictError):
+    # The distcc tool can be specified for multiple platforms, but the
+    # --distcc option can only be added once.  Ignore the error which
+    # results from trying to add it a second time.
+    pass
+
+  # If distcc isn't enabled, stop now
+  if not env.GetOption('distcc'):
+    return
+
+  # Copy DISTCC_HOSTS and HOME environment variables from system environment
+  for envvar in ('DISTCC_HOSTS', 'HOME'):
+    value = env.get(envvar, os.environ.get(envvar))
+    if not value:
+      print 'Warning: %s not set in environment; disabling distcc.' % envvar
+      return
+    env['ENV'][envvar] = value
+
+  # Set name of distcc tool
+  env['DISTCC'] = 'distcc'
+
+  # Modify compilers we support
+  distcc_compilers = env.get('DISTCC_COMPILERS', ['cc', 'gcc', 'c++', 'g++'])
+  for compiler_var in ('CC', 'CXX'):
+    compiler = env.get(compiler_var)
+    if compiler in distcc_compilers:
+      env[compiler_var] = '$DISTCC ' + compiler
+
+
+def exists(env):
+  """Returns true if tool exists."""
+  # NOTE: SCons requires the use of this name, which fails gpylint.
+  return env.Detect('distcc')