Dropping in software construction toolkit.

site_scons/site_tools/target_platform_windows.py

Index: site_scons/site_tools/target_platform_windows.py
===================================================================
--- site_scons/site_tools/target_platform_windows.py	(revision 0)
+++ site_scons/site_tools/target_platform_windows.py	(revision 0)
@@ -0,0 +1,262 @@
+#!/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.
+
+"""Build tool setup for Windows.
+
+This module is a SCons tool which should be include in the topmost windows
+environment.
+It is used as follows:
+  env = base_env.Clone(tools = ['component_setup'])
+  win_env = base_env.Clone(tools = ['target_platform_windows'])
+"""
+
+
+import os
+import time
+import command_output
+import SCons.Script
+
+
+def WaitForWritable(target, source, env):
+  """Waits for the target to become writable.
+
+  Args:
+    target: List of target nodes.
+    source: List of source nodes.
+    env: Environment context.
+
+  Returns:
+    Zero if success, nonzero if error.
+
+  This is a necessary hack on Windows, where antivirus software can lock exe
+  files briefly after they're written.  This can cause subsequent reads of the
+  file by env.Install() to fail.  To prevent these failures, wait for the file
+  to be writable.
+  """
+  target_path = target[0].abspath
+  if not os.path.exists(target_path):
+    return 0      # Nothing to wait for
+
+  for retries in range(10):
+    try:
+      f = open(target_path, 'a+b')
+      f.close()
+      return 0    # Successfully opened file for write, so we're done
+    except (IOError, OSError):
+      print 'Waiting for access to %s...' % target_path
+      time.sleep(1)
+
+  # If we're still here, fail
+  print 'Timeout waiting for access to %s.' % target_path
+  return 1
+
+
+def RunManifest(target, source, env, resource_num):
+  """Run the Microsoft Visual Studio manifest tool (mt.exe).
+
+  Args:
+    target: List of target nodes.
+    source: List of source nodes.
+    env: Environment context.
+    resource_num: Resource number to modify in target (1=exe, 2=dll).
+
+  Returns:
+    Zero if success, nonzero if error.
+
+  The mt.exe tool seems to experience intermittent failures trying to write to
+  .exe or .dll files.  Antivirus software makes this worse, but the problem
+  can still occur even if antivirus software is disabled.  The failures look
+  like:
+
+      mt.exe : general error c101008d: Failed to write the updated manifest to
+      the resource of file "(name of exe)". Access is denied.
+
+  with mt.exe returning an errorlevel (return code) of 31.  The workaround is
+  to retry running mt.exe after a short delay.
+  """
+
+  cmdline = env.subst(
+      'mt.exe -nologo -manifest ${TARGET}.manifest -outputresource:$TARGET;%d'
+      % resource_num,
+      target=target, source=source)
+  print cmdline
+
+  for retry in range(5):
+    # If this is a retry, print a message and delay first
+    if retry:
+      # mt.exe failed to write to the target file.  Print a warning message,
+      # delay 3 seconds, and retry.
+      print 'Warning: mt.exe failed to write to %s; retrying.' % target[0]
+      time.sleep(3)
+
+    return_code, output = command_output.RunCommand(
+        cmdline, env=env['ENV'], echo_output=False)
+    if return_code != 31:    # Something other than the intermittent error
+      break
+
+  # Pass through output (if any) and return code from manifest
+  if output:
+    print output
+  return return_code
+
+
+def RunManifestExe(target, source, env):
+  """Calls RunManifest for updating an executable (resource_num=1)."""
+  return RunManifest(target, source, env, resource_num=1)
+
+
+def RunManifestDll(target, source, env):
+  """Calls RunManifest for updating a dll (resource_num=2)."""
+  return RunManifest(target, source, env, resource_num=2)
+
+
+def ComponentPlatformSetup(env, builder_name):
+  """Hook to allow platform to modify environment inside a component builder.
+
+  Args:
+    env: Environment to modify
+    builder_name: Name of the builder
+  """
+  if env.get('ENABLE_EXCEPTIONS'):
+    env.FilterOut(
+        CPPDEFINES=['_HAS_EXCEPTIONS=0'],
+        # There are problems with LTCG when some files are compiled with
+        # exceptions and some aren't (the v-tables for STL and BOOST classes
+        # don't match).  Therefore, turn off LTCG when exceptions are enabled.
+        CCFLAGS=['/GL'],
+        LINKFLAGS=['/LTCG'],
+        ARFLAGS=['/LTCG'],
+    )
+    env.Append(CCFLAGS=['/EHsc'])
+
+  if builder_name in ('ComponentObject', 'ComponentLibrary'):
+    if env.get('COMPONENT_STATIC'):
+      env.Append(CPPDEFINES=['_LIB'])
+    else:
+      env.Append(CPPDEFINES=['_USRDLL', '_WINDLL'])
+
+  if builder_name == 'ComponentTestProgram':
+    env.FilterOut(
+        CPPDEFINES=['_WINDOWS'],
+        LINKFLAGS=['/SUBSYSTEM:WINDOWS'],
+    )
+    env.Append(
+        CPPDEFINES=['_CONSOLE'],
+        LINKFLAGS=['/SUBSYSTEM:CONSOLE'],
+    )
+
+#------------------------------------------------------------------------------
+
+
+def generate(env):
+  # NOTE: SCons requires the use of this name, which fails gpylint.
+  """SCons entry point for this tool."""
+
+  # Set up environment paths first
+
+  # Load various Visual Studio related tools.
+  env.Tool('as')
+  env.Tool('msvs')
+  env.Tool('windows_hard_link')
+
+  pre_msvc_env = env['ENV'].copy()
+
+  env.Tool('msvc')
+  env.Tool('mslib')
+  env.Tool('mslink')
+
+  # The msvc, mslink, and mslib tools search the registry for installed copies
+  # of Visual Studio and prepends them to the PATH, INCLUDE, and LIB
+  # environment variables.  Block these changes if necessary.
+  if env.get('MSVC_BLOCK_ENVIRONMENT_CHANGES'):
+    env['ENV'] = pre_msvc_env
+
+  # Declare bits
+  DeclareBit('windows', 'Target platform is windows.',
+             exclusive_groups=('target_platform'))
+  env.SetBits('windows')
+
+  env.Replace(
+      TARGET_PLATFORM='WINDOWS',
+      COMPONENT_PLATFORM_SETUP=ComponentPlatformSetup,
+
+      # A better rebuild command (actually cleans, then rebuild)
+      MSVSREBUILDCOM=''.join(['$MSVSSCONSCOM -c "$MSVSBUILDTARGET" && ',
+                              '$MSVSSCONSCOM "$MSVSBUILDTARGET"']),
+  )
+
+  env.Append(
+      HOST_PLATFORMS=['WINDOWS'],
+      CPPDEFINES=['OS_WINDOWS=OS_WINDOWS'],
+
+      # Turn up the warning level
+      CCFLAGS=['/W3'],
+
+      # Force x86 platform for now
+      LINKFLAGS=['/MACHINE:X86'],
+      ARFLAGS=['/MACHINE:X86'],
+
+      # Settings for debug
+      CCFLAGS_DEBUG=[
+          '/Od',     # disable optimizations
+          '/RTC1',   # enable fast checks
+          '/MTd',    # link with LIBCMTD.LIB debug lib
+      ],
+      LINKFLAGS_DEBUG=['/DEBUG'],
+
+      # Settings for optimized
+      CCFLAGS_OPTIMIZED=[
+          '/O1',     # optimize for size
+          '/MT',     # link with LIBCMT.LIB (multi-threaded, static linked crt)
+          '/GS',     # enable security checks
+      ],
+
+      # Settings for component_builders
+      COMPONENT_LIBRARY_LINK_SUFFIXES=['.lib'],
+      COMPONENT_LIBRARY_DEBUG_SUFFIXES=['.pdb'],
+  )
+
+  # Add manifests to EXEs and DLLs
+  wait_action = SCons.Script.Action(WaitForWritable,
+                                    lambda target, source, env: ''),
+  env['LINKCOM'] = [
+      env['LINKCOM'],
+      SCons.Script.Action(RunManifestExe, lambda target, source, env: ''),
+      SCons.Script.Delete('${TARGET}.manifest'),
+      wait_action,
+  ]
+  env['SHLINKCOM'] = [
+      env['SHLINKCOM'],
+      SCons.Script.Action(RunManifestDll, lambda target, source, env: ''),
+      SCons.Script.Delete('${TARGET}.manifest'),
+      wait_action,
+  ]
+  env['WINDOWS_INSERT_MANIFESTS'] = True
+  env.Append(LINKFLAGS=['-manifest'])