Windows: Support building with a custom VS toolchain (issue #1470).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1950 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

tools/gclient_hook.py

@@ -6,8 +6,10 @@
 from gclient_util import *
 import os, sys
 
-# The CEF root directory is the parent directory of _this_ script.
+# The CEF directory is the parent directory of _this_ script.
 cef_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
+# The src directory is the parent directory of the CEF directory.
+src_dir = os.path.abspath(os.path.join(cef_dir, os.pardir))
 
 print "\nGenerating CEF version header file..."
 gyper = [ 'python', 'tools/make_version_header.py',
@@ -30,6 +32,77 @@ print "\nGenerating CEF project files..."
 if not 'DEPOT_TOOLS_WIN_TOOLCHAIN' in os.environ.keys():
   os.environ['DEPOT_TOOLS_WIN_TOOLCHAIN'] = '0'
 
+# By default GYP+Ninja on Windows expects Visual Studio to be installed on the
+# local machine. To build when Visual Studio is extracted to a directory but not
+# installed (e.g. via a custom toolchain) you have two options:
+#
+# 1. Set up the environment using only environment variables:
+#   set WIN_CUSTOM_TOOLCHAIN=1
+#   set VS_ROOT=<VS root directory>
+#   set SDK_ROOT=<Platform SDK root directory>
+#   set INCLUDE=<VS include paths>
+#   set PATH=<VS executable paths>
+#   set LIB=<VS library paths>
+#
+# 2. Set up the environment using a combination of environment variables and the
+#    "%GYP_MSVS_OVERRIDE_PATH%\VC\vcvarsall.bat" script:
+#   set GYP_MSVS_OVERRIDE_PATH=<VS root directory>
+#   set GYP_DEFINES="windows_sdk_path=<Platform SDK root directory>"
+#
+# The following environment variables must also be set:
+#   set DEPOT_TOOLS_WIN_TOOLCHAIN=0
+#   set GYP_MSVS_VERSION=<VS version>
+#   set CEF_VCVARS=<empty .bat file>
+custom_toolchain = False
+if 'WIN_CUSTOM_TOOLCHAIN' in os.environ.keys() and \
+    os.environ['WIN_CUSTOM_TOOLCHAIN'] == '1':
+  required_vars = [
+    'GYP_MSVS_VERSION',
+    'VS_ROOT',
+    'SDK_ROOT',
+    'INCLUDE',
+    'PATH',
+    'LIB',
+  ]
+  for var in required_vars:
+    if not var in os.environ.keys():
+      raise Exception('%s environment variable must be set' % var)
+
+  custom_toolchain = True
+
+  # Set windows_sdk_path via GYP_DEFINES.
+  gyp_defines = ''
+  if 'GYP_DEFINES' in os.environ.keys():
+    gyp_defines = os.environ['GYP_DEFINES'] + ' '
+  gyp_defines = gyp_defines + \
+                'windows_sdk_path=' + os.environ['SDK_ROOT'].replace('\\', '/')
+  os.environ['GYP_DEFINES'] = gyp_defines
+
+  # Necessary to return correct VS version information via GetVSVersion in
+  # src/tools/gyp/pylib/gyp/msvs_emulation.py.
+  os.environ['GYP_MSVS_OVERRIDE_PATH'] = os.environ['VS_ROOT']
+
+  # Generate environment files (environment.x64, environment.x86) in each
+  # build output directory.
+  # When using the default toolchain this is done by GenerateEnvironmentFiles
+  # in src/tools/gyp/pylib/gyp/msvs_emulation.py.
+  setup_script = \
+      os.path.join(src_dir, 'build/toolchain/win/setup_toolchain.py')
+  win_tool_script = os.path.join(src_dir, 'tools/gyp/pylib/gyp/win_tool.py')
+  out_dirs = ['Debug', 'Debug_x64', 'Release', 'Release_x64']
+  for out_dir in out_dirs:
+    out_dir_abs = os.path.join(src_dir, 'out', out_dir)
+    if not os.path.exists(out_dir_abs):
+      os.makedirs(out_dir_abs)
+    cmd = ['python', setup_script,
+           os.environ['VS_ROOT'], win_tool_script, os.environ['SDK_ROOT']]
+    RunAction(out_dir_abs, cmd)
+
 os.environ['CEF_DIRECTORY'] = os.path.basename(cef_dir)
 gyper = [ 'python', '../build/gyp_chromium', 'cef.gyp', '-I', 'cef.gypi' ]
+if custom_toolchain:
+  # Disable GYP's auto-detection of the VS install.
+  gyper.extend(['-G', 'ninja_use_custom_environment_files'])
+if 'GYP_ARGUMENTS' in os.environ.keys():
+  gyper.extend(os.environ['GYP_ARGUMENTS'].split(' '))
 RunAction(cef_dir, gyper)