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.gn
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# This file is used by the GN meta build system to find the root of the source
# tree and to set startup options. For documentation on the values set in this
# file, run "gn help dotfile" at the command line.
import("//build/dotfile_settings.gni")
import("//third_party/angle/dotfile_settings.gni")
# The location of the build configuration file.
buildconfig = "//build/config/BUILDCONFIG.gn"
# The python interpreter to use by default. On Windows, this will look
# for python3.exe and python3.bat.
script_executable = "python3"
# These arguments override the default values for items in a declare_args
# block. "gn args" in turn can override these.
#
# In general the value for a build arg in the declare_args block should be the
# default. In some cases, a DEPS-ed in project will want different defaults for
# being built as part of Chrome vs. being built standalone. In this case, the
# Chrome defaults should go here. There should be no overrides here for
# values declared in the main Chrome repository.
#
# Important note for defining defaults: This file is executed before the
# BUILDCONFIG.gn file. That file sets up the global variables like "is_ios".
# This means that the default_args can not depend on the platform,
# architecture, or other build parameters. If you really need that, the other
# repo should define a flag that toggles on a behavior that implements the
# additional logic required by Chrome to set the variables.
default_args = {
# TODO(brettw) bug 684096: Chrome on iOS does not build v8, so "gn gen" prints
# a warning that "Build argument has no effect". When adding a v8 variable, it
# also needs to be defined to src/ios/BUILD.gn (respectively removed from both
# location when it is removed).
v8_extra_library_files = []
v8_experimental_extra_library_files = []
v8_enable_gdbjit = false
v8_imminent_deprecation_warnings = false
# Don't include webrtc's builtin task queue implementation.
rtc_link_task_queue_impl = false
# Don't include the iLBC audio codec.
# TODO(bugs.webrtc.org/8396): Once WebRTC gets rid of its internal
# deps on codecs, we can remove this.
rtc_include_ilbc = false
# Changes some setup for the Crashpad build to set them to build against
# Chromium's zlib, base, etc.
crashpad_dependencies = "chromium"
# Override ANGLE's Vulkan dependencies.
angle_vulkan_headers_dir = "//third_party/vulkan-deps/vulkan-headers/src"
angle_vulkan_loader_dir = "//third_party/vulkan-deps/vulkan-loader/src"
angle_vulkan_tools_dir = "//third_party/vulkan-deps/vulkan-tools/src"
angle_vulkan_validation_layers_dir =
"//third_party/vulkan-deps/vulkan-validation-layers/src"
}
# These are the targets to skip header checking by default. The files in targets
# matching these patterns (see "gn help label_pattern" for format) will not have
# their includes checked for proper dependencies when you run either
# "gn check" or "gn gen --check".
no_check_targets = [
"//extensions/browser:*", # 20 errors
"//extensions:*", # 28 errors
"//headless:*", # 107 errors
"//ppapi/proxy:ipc_sources", # 13 errors
"//ppapi/thunk:*", # 1071 errors
"//remoting/host/security_key:*", # 10 errors
"//remoting/host/win:*", # 43 errors
"//sandbox/win:*", # 7 errors
"//third_party/icu/*",
"//third_party/libwebp:*", # 80 errors, https://crbug.com/800762
# //v8, https://crbug.com/v8/7330
"//v8/src/inspector:inspector", # 20 errors
"//v8/test/cctest:cctest_sources", # 2 errors
"//v8:cppgc_base", # 1 error
"//v8:v8_internal_headers", # 11 errors
"//v8:v8_libplatform", # 2 errors
]
# These are the list of GN files that run exec_script. This whitelist exists
# to force additional review for new uses of exec_script, which is strongly
# discouraged.
#
# PLEASE READ
#
# You should almost never need to add new exec_script calls. exec_script is
# slow, especially on Windows, and can cause confusing effects. Although
# individually each call isn't slow or necessarily very confusing, at the scale
# of our repo things get out of hand quickly. By strongly pushing back on all
# additions, we keep the build fast and clean. If you think you need to add a
# new call, please consider:
#
# - Do not use a script to check for the existence of a file or directory to
# enable a different mode. Instead, use GN build args to enable or disable
# functionality and set options. An example is checking for a file in the
# src-internal repo to see if the corresponding src-internal feature should
# be enabled. There are several things that can go wrong with this:
#
# - It's mysterious what causes some things to happen. Although in many cases
# such behavior can be conveniently automatic, GN optimizes for explicit
# and obvious behavior so people can more easily diagnose problems.
#
# - The user can't enable a mode for one build and not another. With GN build
# args, the user can choose the exact configuration of multiple builds
# using one checkout. But implicitly basing flags on the state of the
# checkout, this functionality is broken.
#
# - It's easy to get stale files. If for example the user edits the gclient
# to stop checking out src-internal (or any other optional thing), it's
# easy to end up with stale files still mysteriously triggering build
# conditions that are no longer appropriate (yes, this happens in real
# life).
#
# - Do not use a script to iterate files in a directory (glob):
#
# - This has the same "stale file" problem as the above discussion. Various
# operations can leave untracked files in the source tree which can cause
# surprising effects.
#
# - It becomes impossible to use "git grep" to find where a certain file is
# referenced. This operation is very common and people really do get
# confused when things aren't listed.
#
# - It's easy to screw up. One common case is a build-time script that packs
# up a directory. The author notices that the script isn't re-run when the
# directory is updated, so adds a glob so all the files are listed as
# inputs. This seems to work great... until a file is deleted. When a
# file is deleted, all the inputs the glob lists will still be up to date
# and no command-lines will have been changed. The action will not be
# re-run and the build will be broken. It is possible to get this correct
# using glob, and it's possible to mess it up without glob, but globs make
# this situation much easier to create. if the build always lists the
# files and passes them to a script, it will always be correct.
exec_script_whitelist =
build_dotfile_settings.exec_script_whitelist +
angle_dotfile_settings.exec_script_whitelist +
[
# Whitelist entries for //build should go into
# //build/dotfile_settings.gni instead, so that they can be shared
# with other repos. The entries in this list should be only for files
# in the Chromium repo outside of //build.
"//build_overrides/build.gni",
"//chrome/android/webapk/shell_apk/prepare_upload_dir/BUILD.gn",
# TODO(dgn): Layer violation but breaks the build otherwise, see
# https://crbug.com/474506.
"//clank/java/BUILD.gn",
"//clank/native/BUILD.gn",
"//google_apis/BUILD.gn",
"//printing/BUILD.gn",
"//remoting/host/installer/linux/BUILD.gn",
"//remoting/remoting_version.gni",
"//remoting/host/installer/win/generate_clsids.gni",
"//tools/grit/grit_rule.gni",
"//tools/gritsettings/BUILD.gn",
]