625 lines
22 KiB
Python
625 lines
22 KiB
Python
# Copyright 2016 The Chromium Embedded Framework Authors. Portions copyright
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# 2012 Google Inc. All rights reserved. Use of this source code is governed by
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# a BSD-style license that can be found in the LICENSE file.
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# This script determines the contents of the per-configuration `args.gn` files
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# that are used to build CEF/Chromium with GN. See comments in CEF's top-level
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# BUILD.gn file for general GN usage instructions.
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#
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# This script performs the following tasks:
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#
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# - Defines CEF's default and required arg values in cases where they differ
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# from Chromium's.
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# - Accepts user-defined arg values via the GN_DEFINES environment variable.
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# - Verifies that user-defined arg values do not conflict with CEF's
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# requirements.
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# - Generates multiple configurations by combining user-defined arg values with
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# CEF's default and required values.
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#
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# Before adding a new arg value in this script determine the following:
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#
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# - Chromium's default value. Default values are defined in the declare_args()
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# sections of *.gni files.
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# - Chromium's value requirements. Check for assert()s related to the value in
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# Chromium code.
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# - Whether a particular value is optional or required for CEF.
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# - Under what conditions a particular value is required for CEF (platform,
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# build type, CPU architecture, etc).
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#
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# If CEF can use Chromium's default value and has no additional validation
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# requirements then do nothing.
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#
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# If CEF can use Chromium's default value but would like to enforce additional
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# validation requirements then go to 3B.
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#
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# If CEF cannot or should not use Chromium's default value then choose one of
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# the following:
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#
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# 1. If CEF requires a different value either globally or based on the platform:
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# - Add an assert() for the value in CEF's top-level BUILD.gn file.
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# - Add the required value in GetRequiredArgs().
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# - Result: CEF's required value will be used. The user cannot override the
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# value via GN_DEFINES.
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#
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# 2. If CEF requires a different value based on the build type or CPU
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# architecture:
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# - Add an assert() for the value in CEF's top-level BUILD.gn file.
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# - Add the required value in GetConfigArgs().
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# - Result: CEF's required value will be used. The user cannot override the
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# value via GN_DEFINES.
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#
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# 3. If CEF recommends (but does not require) a different value either globally
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# or based on the platform:
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# A. Set the default value:
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# - Add the recommended value in GetRecommendedDefaultArgs().
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# - Result: CEF's recommended value will be used by default. The user can
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# override the value via GN_DEFINES.
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#
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# B. If CEF has additional validation requirements:
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# - Add the default Chromium value in GetChromiumDefaultArgs().
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# - Perform validation in ValidateArgs().
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# - Result: An AssertionError will be thrown if validation fails.
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from __future__ import absolute_import
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from __future__ import print_function
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import os
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import platform as python_platform
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import shlex
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import sys
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# The CEF directory is the parent directory of _this_ script.
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cef_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
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# The src directory is the parent directory of the CEF directory.
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src_dir = os.path.abspath(os.path.join(cef_dir, os.pardir))
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# Determine the platform.
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if sys.platform == 'win32':
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platform = 'windows'
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# Windows machines report 'ARM64' or 'AMD64'.
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machine = 'arm64' if python_platform.machine() == 'ARM64' else 'amd64'
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elif sys.platform == 'darwin':
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platform = 'mac'
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# Mac machines report 'arm64' or 'x86_64'.
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machine = 'arm64' if python_platform.machine() == 'arm64' else 'amd64'
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elif sys.platform.startswith('linux'):
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platform = 'linux'
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else:
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print('Unknown operating system platform')
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sys.exit()
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def msg(msg):
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print('NOTE: ' + msg)
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def NameValueListToDict(name_value_list):
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"""
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Takes an array of strings of the form 'NAME=VALUE' and creates a dictionary
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of the pairs. If a string is simply NAME, then the value in the dictionary
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is set to True. If VALUE can be converted to a boolean or integer, it is.
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"""
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result = {}
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for item in name_value_list:
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tokens = item.split('=', 1)
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if len(tokens) == 2:
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token_value = tokens[1]
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if token_value.lower() == 'true':
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token_value = True
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elif token_value.lower() == 'false':
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token_value = False
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else:
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# If we can make it an int, use that, otherwise, use the string.
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try:
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token_value = int(token_value)
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except ValueError:
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pass
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# Set the variable to the supplied value.
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result[tokens[0]] = token_value
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else:
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# No value supplied, treat it as a boolean and set it.
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result[tokens[0]] = True
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return result
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def ShlexEnv(env_name):
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"""
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Split an environment variable using shell-like syntax.
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"""
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flags = os.environ.get(env_name, [])
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if flags:
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flags = shlex.split(flags)
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return flags
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def MergeDicts(*dict_args):
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"""
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Given any number of dicts, shallow copy and merge into a new dict.
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Precedence goes to key value pairs in latter dicts.
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"""
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result = {}
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for dictionary in dict_args:
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result.update(dictionary)
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return result
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def GetValueString(val):
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"""
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Return the string representation of |val| expected by GN.
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"""
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if isinstance(val, bool):
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if val:
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return 'true'
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else:
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return 'false'
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elif isinstance(val, int):
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return val
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else:
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return '"%s"' % val
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return val
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def GetChromiumDefaultArgs():
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"""
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Return default GN args. These must match the Chromium defaults.
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Only args that may be retrieved via GetArgValue() need to be specified here.
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"""
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# Search for these values in declare_args() sections of *.gni files to find
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# the defaults.
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defaults = {
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'dcheck_always_on': False,
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'is_asan': False,
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'is_debug': True,
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'is_official_build': False,
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'target_cpu': 'x64',
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}
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if platform == 'linux':
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defaults['use_sysroot'] = True
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if platform == 'windows':
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defaults['is_win_fastlink'] = False
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defaults['visual_studio_path'] = ''
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defaults['visual_studio_version'] = ''
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defaults['visual_studio_runtime_dirs'] = ''
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defaults['windows_sdk_path'] = ''
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return defaults
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def GetArgValue(args, key):
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"""
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Return an existing GN arg value or the Chromium default.
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"""
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defaults = GetChromiumDefaultArgs()
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assert key in defaults, "No default Chromium value specified for %s" % key
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return args.get(key, defaults[key])
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def GetRecommendedDefaultArgs():
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"""
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Return recommended default GN args that differ from Chromium defaults.
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"""
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# Search for these values in declare_args() sections of *.gni files to find
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# the defaults.
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result = {
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# Enable NaCL. Default is true. False is recommended for faster builds.
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'enable_nacl': False,
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# Disable component builds. Default depends on the platform. True results
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# in faster local builds but False is required to create a CEF binary
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# distribution.
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'is_component_build': False,
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# Specify the current PGO phase. Default is 0 (turned off) for normal
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# builds and 2 (used during the optimization phase) for official Windows
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# and macOS builds. Currently turned off for CEF because it requires
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# additional setup and is not yet tested. See issue #2956.
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'chrome_pgo_phase': 0,
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# Disable support for background apps, which don't make sense with CEF.
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# Default is enabled on desktop platforms. This feature was also causing
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# strange shutdown crashes when using the Chrome runtime with a Debug
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# component build on Windows.
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'enable_background_mode': False,
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# Disable support for resource allowlist generation. When enabled this
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# introduces a Windows official build dependency on the
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# "//chrome:chrome_dll" target, which will fail to build with CEF.
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'enable_resource_allowlist_generation': False,
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}
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if platform != 'windows':
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# Only allow non-component Debug builds on non-Windows platforms. These
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# builds will fail on Windows due to linker issues (running out of memory,
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# etc). See https://bitbucket.org/chromiumembedded/cef/issues/2679.
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result['forbid_non_component_debug_builds'] = False
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if platform == 'mac':
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# Use the system allocator on Mac. Default is 'partition' (PartitionAlloc)
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# with the allocator shim enabled. See issue #3061.
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result['use_allocator'] = 'none'
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result['use_allocator_shim'] = False
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if platform == 'linux':
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# Use a sysroot environment. Default is true. False is recommended for local
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# builds.
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# Run the following commands to download the sysroot environment:
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# x86 build only: $ export GYP_DEFINES='target_arch=ia32'
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# x86 or x64 build: $ gclient runhooks
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result['use_sysroot'] = False
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# Don't add the `-Wl,--fatal-warnings` linker flag when building on Ubuntu
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# 14 (Trusty) host systems. It results in errors like the following:
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# ld.lld: error: found local symbol '__bss_start' in global part of symbol
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# table in file /usr/lib/x86_64-linux-gnu/libGL.so
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# TODO(cef): Remove this flag once we require a newer host system.
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result['fatal_linker_warnings'] = False
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return result
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def GetGNEnvArgs():
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"""
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Return GN args specified via the GN_DEFINES env variable.
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"""
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return NameValueListToDict(ShlexEnv('GN_DEFINES'))
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def GetRequiredArgs():
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"""
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Return required GN args. Also enforced by assert() in //cef/BUILD.gn.
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"""
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result = {
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# Set ENABLE_PRINTING=1 ENABLE_BASIC_PRINTING=1.
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'enable_basic_printing': True,
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# ENABLE_SERVICE_DISCOVERY=0 for print preview support
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'enable_print_preview': True,
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'optimize_webui': True,
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# Enable support for Widevine CDM.
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'enable_widevine': True,
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# Don't use the chrome style plugin.
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'clang_use_chrome_plugins': False,
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}
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if platform == 'linux':
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# Don't generate Chromium installer packages. This avoids GN dependency
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# errors with CEF (see issue #2301).
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# Due to the way this variable is declared in chrome/installer/BUILD.gn it
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# can't be enforced by assert().
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result['enable_linux_installer'] = False
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return result
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def GetMergedArgs(build_args):
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"""
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Return merged GN args.
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"""
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dict = MergeDicts(GetRecommendedDefaultArgs(), GetGNEnvArgs(), build_args)
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# Verify that the user is not trying to override required args.
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required = GetRequiredArgs()
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for key in required.keys():
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if key in dict:
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assert dict[key] == required[key], \
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"%s=%s is required" % (key, GetValueString(required[key]))
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return MergeDicts(dict, required)
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def ValidateArgs(args):
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"""
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Validate GN arg combinations that we know about. Also provide suggestions
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where appropriate.
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"""
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dcheck_always_on = GetArgValue(args, 'dcheck_always_on')
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is_asan = GetArgValue(args, 'is_asan')
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is_debug = GetArgValue(args, 'is_debug')
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is_official_build = GetArgValue(args, 'is_official_build')
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target_cpu = GetArgValue(args, 'target_cpu')
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if platform == 'linux':
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use_sysroot = GetArgValue(args, 'use_sysroot')
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if platform == 'windows':
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is_win_fastlink = GetArgValue(args, 'is_win_fastlink')
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visual_studio_path = GetArgValue(args, 'visual_studio_path')
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visual_studio_version = GetArgValue(args, 'visual_studio_version')
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visual_studio_runtime_dirs = GetArgValue(args, 'visual_studio_runtime_dirs')
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windows_sdk_path = GetArgValue(args, 'windows_sdk_path')
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# Target CPU architecture.
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# - Windows supports "x86", "x64" and "arm64".
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# - Mac supports "x64" and "arm64".
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# - Linux supports only "x64" unless using a sysroot environment.
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if platform == 'mac':
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assert target_cpu in ('x64', 'arm64'), 'target_cpu must be "x64" or "arm64"'
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elif platform == 'windows':
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assert target_cpu in ('x86', 'x64',
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'arm64'), 'target_cpu must be "x86", "x64" or "arm64"'
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elif platform == 'linux':
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assert target_cpu in (
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'x86', 'x64', 'arm',
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'arm64'), 'target_cpu must be "x86", "x64", "arm" or "arm64"'
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if platform == 'linux':
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if target_cpu == 'x86':
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assert use_sysroot, 'target_cpu="x86" requires use_sysroot=true'
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elif target_cpu == 'arm':
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assert use_sysroot, 'target_cpu="arm" requires use_sysroot=true'
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elif target_cpu == 'arm64':
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assert use_sysroot, 'target_cpu="arm64" requires use_sysroot=true'
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# ASAN requires Release builds.
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if is_asan:
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assert not is_debug, "is_asan=true requires is_debug=false"
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if not dcheck_always_on:
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msg('is_asan=true recommends dcheck_always_on=true')
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# Official build requires Release builds.
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if is_official_build:
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assert not is_debug, "is_official_build=true requires is_debug=false"
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if platform == 'windows':
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# Official builds should not use /DEBUG:FASTLINK.
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if is_official_build:
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assert not is_win_fastlink, "is_official_build=true precludes is_win_fastlink=true"
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# Windows custom toolchain requirements.
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#
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# Required GN arguments:
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# visual_studio_path="<path to VS root>"
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# The directory that contains Visual Studio. For example, a subset of
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# "C:\Program Files (x86)\Microsoft Visual Studio 14.0".
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# visual_studio_version="<VS version>"
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# The VS version. For example, "2015".
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# visual_studio_runtime_dirs="<path to VS CRT>"
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# The directory that contains the VS CRT. For example, the contents of
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# "C:\Program Files (x86)\Windows Kits\10\Redist\ucrt\DLLs\x64" plus
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# "C:\Windows\System32\ucrtbased.dll"
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# windows_sdk_path="<path to WinSDK>"
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# The directory that contains the Win SDK. For example, a subset of
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# "C:\Program Files (x86)\Windows Kits\10".
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#
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# Required environment variables:
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# DEPOT_TOOLS_WIN_TOOLCHAIN=0
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# GYP_MSVS_OVERRIDE_PATH=<path to VS root, must match visual_studio_path>
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# GYP_MSVS_VERSION=<VS version, must match visual_studio_version>
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# CEF_VCVARS=none
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#
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# Optional environment variables (required if vcvarsall.bat does not exist):
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# INCLUDE=<VS include paths>
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# LIB=<VS library paths>
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# PATH=<VS executable paths>
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#
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# See comments in gclient_hook.py for environment variable usage.
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#
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if visual_studio_path != '':
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assert visual_studio_version != '', 'visual_studio_path requires visual_studio_version'
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assert visual_studio_runtime_dirs != '', 'visual_studio_path requires visual_studio_runtime_dirs'
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assert windows_sdk_path != '', 'visual_studio_path requires windows_sdk_path'
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assert os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '') == '0', \
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"visual_studio_path requires DEPOT_TOOLS_WIN_TOOLCHAIN=0 env variable"
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msvs_path = os.environ.get('GYP_MSVS_OVERRIDE_PATH', '')
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assert msvs_path == visual_studio_path and os.path.exists(msvs_path), \
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"visual_studio_path requires matching GYP_MSVS_OVERRIDE_PATH env variable"
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msvs_version = os.environ.get('GYP_MSVS_VERSION', '')
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assert msvs_version == visual_studio_version, \
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"visual_studio_version requires matching GYP_MSVS_VERSION env variable"
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assert os.environ.get('CEF_VCVARS', '') == 'none', \
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"visual_studio_path requires CEF_VCVARS=none env variable"
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# If vcvarsall.bat exists then environment variables will be derived from
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# there and any specified INCLUDE/LIB values will be ignored by Chromium
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# (PATH is retained because it might contain required VS runtime
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# libraries). If this file does not exist then the INCLUDE/LIB/PATH values
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# are also required by Chromium.
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vcvars_path = os.path.join(msvs_path, 'VC', 'vcvarsall.bat')
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if not os.path.exists(vcvars_path):
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vcvars_path = os.path.join(msvs_path, 'VC', 'Auxiliary', 'Build',
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'vcvarsall.bat')
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if os.path.exists(vcvars_path):
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if 'INCLUDE' in os.environ:
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del os.environ['INCLUDE']
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if 'LIB' in os.environ:
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del os.environ['LIB']
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if 'LIBPATH' in os.environ:
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del os.environ['LIBPATH']
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else:
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assert 'INCLUDE' in os.environ \
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and 'LIB' in os.environ \
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and 'PATH' in os.environ, \
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"visual_studio_path requires INCLUDE, LIB and PATH env variables"
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def GetConfigArgs(args, is_debug, cpu):
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"""
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Return merged GN args for the configuration and validate.
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"""
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add_args = {}
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# Cannot create is_official_build=true is_debug=true builds.
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# This restriction is enforced in //build/config/BUILDCONFIG.gn.
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# Instead, our "official Debug" build is a Release build with dchecks and
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# symbols. Symbols will be generated by default for official builds; see the
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# definition of 'symbol_level' in //build/config/compiler/compiler.gni.
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if is_debug and GetArgValue(args, 'is_official_build'):
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is_debug = False
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add_args['dcheck_always_on'] = True
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result = MergeDicts(args, add_args, {
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'is_debug': is_debug,
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'target_cpu': cpu,
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})
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if platform == 'linux' and not cpu.startswith('arm'):
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# Remove any arm-related values from non-arm configs.
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for key in result.keys():
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if key.startswith('arm_'):
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del result[key]
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ValidateArgs(result)
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return result
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def GetConfigArgsSandbox(platform, args, is_debug, cpu):
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"""
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Return merged GN args for the cef_sandbox configuration and validate.
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"""
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add_args = {
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# Avoid libucrt.lib linker errors.
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'use_allocator_shim': False,
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# PartitionAlloc is selected as the default allocator in some cases.
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# We can't use it because it requires use_allocator_shim=true.
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|
'use_allocator': "none",
|
|
|
|
# Avoid /LTCG linker warnings and generate smaller lib files.
|
|
'is_official_build': False,
|
|
|
|
# Enable base target customizations necessary for distribution of the
|
|
# cef_sandbox static library.
|
|
'is_cef_sandbox_build': True,
|
|
}
|
|
|
|
if platform == 'windows':
|
|
# Avoid Debug build linker errors caused by custom libc++.
|
|
add_args['use_custom_libcxx'] = False
|
|
|
|
# Avoid dependency on //third_party/perfetto:libperfetto which fails to
|
|
# build with MSVC libc++.
|
|
add_args['enable_base_tracing'] = False
|
|
|
|
# Don't enable -Wmax-tokens in combination with MSVC libc++.
|
|
add_args['enable_wmax_tokens'] = False
|
|
|
|
# Allow non-component Debug builds for the sandbox.
|
|
add_args['forbid_non_component_debug_builds'] = False
|
|
|
|
result = MergeDicts(args, add_args, {
|
|
'is_debug': is_debug,
|
|
'target_cpu': cpu,
|
|
})
|
|
|
|
ValidateArgs(result)
|
|
return result
|
|
|
|
|
|
def LinuxSysrootExists(cpu):
|
|
"""
|
|
Returns true if the sysroot for the specified |cpu| architecture exists.
|
|
"""
|
|
# Directory that contains sysroots.
|
|
sysroot_root = os.path.join(src_dir, 'build', 'linux')
|
|
# CPU-specific sysroot directory names.
|
|
# Should match the values in build/config/sysroot.gni.
|
|
if cpu == 'x86':
|
|
sysroot_name = 'debian_sid_i386-sysroot'
|
|
elif cpu == 'x64':
|
|
sysroot_name = 'debian_sid_amd64-sysroot'
|
|
elif cpu == 'arm':
|
|
sysroot_name = 'debian_sid_arm-sysroot'
|
|
elif cpu == 'arm64':
|
|
sysroot_name = 'debian_sid_arm64-sysroot'
|
|
else:
|
|
raise Exception('Unrecognized sysroot CPU: %s' % cpu)
|
|
|
|
return os.path.isdir(os.path.join(sysroot_root, sysroot_name))
|
|
|
|
|
|
def GetAllPlatformConfigs(build_args):
|
|
"""
|
|
Return a map of directory name to GN args for the current platform.
|
|
"""
|
|
result = {}
|
|
|
|
# Merged args without validation.
|
|
args = GetMergedArgs(build_args)
|
|
|
|
create_debug = True
|
|
|
|
# Don't create debug directories for asan builds.
|
|
if GetArgValue(args, 'is_asan'):
|
|
create_debug = False
|
|
msg('Not generating Debug configuration due to is_asan=true')
|
|
|
|
supported_cpus = []
|
|
|
|
if platform == 'linux':
|
|
use_sysroot = GetArgValue(args, 'use_sysroot')
|
|
if use_sysroot:
|
|
# Only generate configurations for sysroots that have been installed.
|
|
for cpu in ('x86', 'x64', 'arm', 'arm64'):
|
|
if LinuxSysrootExists(cpu):
|
|
supported_cpus.append(cpu)
|
|
else:
|
|
msg('Not generating %s configuration due to missing sysroot directory'
|
|
% cpu)
|
|
else:
|
|
supported_cpus = ['x64']
|
|
elif platform in ('windows', 'mac'):
|
|
if machine == 'amd64' or os.environ.get('CEF_ENABLE_AMD64', '') == '1':
|
|
supported_cpus.append('x64')
|
|
if platform == 'windows':
|
|
supported_cpus.append('x86')
|
|
if machine == 'arm64' or os.environ.get('CEF_ENABLE_ARM64', '') == '1':
|
|
supported_cpus.append('arm64')
|
|
else:
|
|
raise Exception('Unsupported platform')
|
|
|
|
if len(supported_cpus) == 0:
|
|
raise Exception('No supported architectures')
|
|
|
|
for cpu in supported_cpus:
|
|
if create_debug:
|
|
result['Debug_GN_' + cpu] = GetConfigArgs(args, True, cpu)
|
|
result['Release_GN_' + cpu] = GetConfigArgs(args, False, cpu)
|
|
|
|
if platform in ('windows', 'mac') and GetArgValue(args,
|
|
'is_official_build'):
|
|
# Build cef_sandbox.lib with a different configuration.
|
|
if create_debug:
|
|
result['Debug_GN_' + cpu + '_sandbox'] = GetConfigArgsSandbox(
|
|
platform, args, True, cpu)
|
|
result['Release_GN_' + cpu + '_sandbox'] = GetConfigArgsSandbox(
|
|
platform, args, False, cpu)
|
|
|
|
return result
|
|
|
|
|
|
def GetConfigFileContents(args):
|
|
"""
|
|
Generate config file contents for the arguments.
|
|
"""
|
|
pairs = []
|
|
for k in sorted(args.keys()):
|
|
pairs.append("%s=%s" % (k, GetValueString(args[k])))
|
|
return "\n".join(pairs)
|
|
|
|
|
|
# Program entry point.
|
|
if __name__ == '__main__':
|
|
import sys
|
|
|
|
# Allow override of the platform via the command-line for testing.
|
|
if len(sys.argv) > 1:
|
|
platform = sys.argv[1]
|
|
if not platform in ('linux', 'mac', 'windows'):
|
|
sys.stderr.write('Usage: %s <platform>\n' % sys.argv[0])
|
|
sys.exit()
|
|
|
|
print('Platform: %s' % platform)
|
|
|
|
# Dump the configuration based on platform and environment.
|
|
configs = GetAllPlatformConfigs({})
|
|
for dir, config in configs.items():
|
|
print('\n\nout/%s:\n' % dir)
|
|
print(GetConfigFileContents(config))
|