Remove dependancies on gcc/perl etc. This saves a bunch of stats and

build/SConscript.main

 # Copyright (c) 2006-2008 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.
 
 import os
 import shutil
 import sys
 
 
 p = ARGUMENTS.get('PROGRESS')
@@ skipping 320 matching lines @@
 windows_opt.Tool('target_optimized')
 windows_opt.ApplySConscript(['$CHROME_SRC_DIR/build/release.scons'])
 
 # --------------------------------------------------------------------------
 # Linux specific
 
 linux_env = root_env.Clone()
 linux_env.Tool('target_platform_linux')
 linux_env.Tool('yacc')
 
+# By default scons will depend on the first path element for any command line.
+# For example, it will resolve 'gcc' with $PATH and depend on that for any
+# action which runs gcc. This disables this behaviour:
+linux_env['IMPLICIT_COMMAND_DEPENDENCIES'] = False
+
 # TODO(bradnelson): this is needed for now because target_platform_linux has
 # OS_LINUX defined in a weird way.
 linux_env.FilterOut(CPPDEFINES = ['OS_LINUX=OS_LINUX'])
 
 # Copy some environment variables from the outer environment to the
 # SCons.Environment if they exist.
 for envvar in ('CC', 'CXX', 'LINK'):
   if envvar in os.environ:
     linux_env[envvar] = os.environ[envvar]
 # Copy these environment variables from the outer environment to the
@@ skipping 334 matching lines @@
         'all_libraries',
         'all_languages',
         'all_programs',
         'all_test_programs',
     ], projects = [p],
     COMPONENT_VS_PROJECT_SCRIPT_PATH=(
         'cd $$(ProjectDir)/$VS_PROJECT_TO_MAIN_DIR && hammer.bat'),
 )
 
 # -------------------------------------------------------------------------