from–https://blog.csdn.net/LostSpeed/article/details/84984020
前言
查资料时，看到如何看gn都提供什么参数列表了.
这样，编译chromium工程时，可以编译的更精细。
实验
可以将参数写到 Z:\chromium\src\out\my_x86_d\args.gn 中
编译时，执行 gn –ide=vs args out\my_x86_d
e.g.
# @file Z:\chromium\src\out\my_x86_d\args.gn
# @brief build chromium x86 release version
# @ref https://www.chromium.org/developers/gn-build-configuration
# https://blog.csdn.net/Vincent95/article/details/78477822
# @note
# cd /d Z:\chromium\src\
# gn –ide=vs args out\my_x86_d
# autoninja -C out\my_x86_d chrome
#
#
# args.gn begin
#
target_os=”win”
target_cpu = “x86”
is_component_build = true
dcheck_always_on = true
enable_nacl = false
use_goma = false
symbol_level = 2
is_debug = true
is_win_fastlink = false
remove_webcore_debug_symbols = false
# proprietary_codecs 和 media_use_ffmpeg 不兼容, 只能定义一个
# proprietary_codecs = true
# media_use_ffmpeg = true
# rtc_initialize_ffmpeg = true
# rtc_use_h264 = true
# use_openh264 = true
# ffmpeg_branding = “Chrome”
#
# args.gn end
#
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得到gn支持的全部参数列表
gn –ide=vs args out\my_x86_d –list
1
action_pool_depth
Current value (from the default) = -1
From //build/toolchain/BUILD.gn:10
Pool for non goma tasks.
aec_untrusted_delay_for_testing
Current value (from the default) = false
From //third_party/webrtc/modules/audio_processing/BUILD.gn:19
Disables the usual mode where we trust the reported system delay
values the AEC receives. The corresponding define is set appropriately
in the code, but it can be force-enabled here for testing.
allow_critical_memory_pressure_handling_in_foreground
Current value (from the default) = false
From //content/common/features.gni:13
Whether to perform critical memory pressure handling when in foreground (if
false, critical memory pressure is treated like moderate pressure in foreground).
alternate_cdm_storage_id_key
Current value (from the default) = “”
From //media/media_options.gni:160
If |enable_cdm_storage_id| is set, then an implementation specific key
must also be provided. It can be provided by defining CDM_STORAGE_ID_KEY
(which takes precedence), or by setting |alternate_cdm_storage_id_key|.
The key must be a string of at least 32 characters.
android_channel
Current value (from the default) = “default”
From //chrome/android/channel.gni:8
The channel to build on Android: stable, beta, dev, canary, work, or
default. “default” should be used on non-official builds.
android_full_debug
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:47
Normally, Android builds are lightly optimized, even for debug builds, to
keep binary size down. Setting this flag to true disables such optimization
angle_64bit_current_cpu
Current value (from the default) = false
From //third_party/angle/gni/angle.gni:33
angle_enable_d3d11
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:57
angle_enable_d3d9
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:56
angle_enable_essl
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:63
angle_enable_gl
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:58
angle_enable_gl_null
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:68
angle_enable_glsl
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:64
angle_enable_hlsl
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:69
angle_enable_null
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:62
angle_enable_vulkan
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:60
angle_enable_vulkan_validation_layers
Current value (from the default) = true
From //third_party/angle/gni/angle.gni:73
angle_libs_suffix
Current value (from the default) = “”
From //third_party/angle/gni/angle.gni:52
angle_link_glx
Current value (from the default) = false
From //third_party/angle/BUILD.gn:22
Link in system libGL, to work with apitrace. See doc/DebuggingTips.md.
angle_shared_libvulkan
Current value (from the default) = false
From //third_party/angle/gni/angle.gni:51
apm_debug_dump
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:72
Selects whether debug dumps for the audio processing module
should be generated.
asan_globals
Current value (from the default) = true
From //build/config/sanitizers/sanitizers.gni:150
Detect overflow/underflow for global objects.
Mac: http://crbug.com/352073
auto_profile_path
Current value (from the default) = “”
From //build/config/compiler/BUILD.gn:91
AFDO (Automatic Feedback Directed Optimizer) is a form of profile-guided
optimization that GCC supports. It used by ChromeOS in their official
builds. To use it, set auto_profile_path to the path to a file containing
the needed gcov profiling data.
binutils_path
Current value (from the default) = “../../third_party/binutils/Linux_x64/Release/bin”
From //build/config/compiler/BUILD.gn:56
blink_gc_plugin
Current value (from the default) = true
From //third_party/blink/renderer/BUILD.gn:17
Set to true to enable the clang plugin that checks the usage of the Blink
garbage-collection infrastructure during compilation.
blink_gc_plugin_option_do_dump_graph
Current value (from the default) = false
From //third_party/blink/renderer/BUILD.gn:21
Set to true to have the clang Blink GC plugin emit class graph (in JSON)
with typed pointer edges; for debugging or other (internal) uses.
blink_gc_plugin_option_warn_trace_wrappers_missing_base_dispatch
Current value (from the default) = false
From //third_party/blink/renderer/BUILD.gn:30
Set to true to have the clang Blink GC plugin additionally check if a
TraceWrappers method also dispatches to all its base classes.
blink_gc_plugin_option_warn_unneeded_finalizer
Current value (from the default) = false
From //third_party/blink/renderer/BUILD.gn:26
Set to true to have the clang Blink GC plugin additionally check if
a class has an empty destructor which would be unnecessarily invoked
when finalized.
blink_symbol_level
Current value (from the default) = -1
From //third_party/blink/renderer/config.gni:32
How many symbols to include in the build of blink. This affects
the performance of the build since the symbols are large and dealing with
them is slow.
2 means regular build with symbols.
1 means minimal symbols, usually enough for backtraces only. Symbols with
internal linkage (static functions or those in anonymous namespaces) may not
appear when using this level.
0 means no symbols.
-1 means auto-set according to debug/release and platform.
build_angle_deqp_tests
Current value (from the default) = false
From //third_party/angle/src/tests/BUILD.gn:19
Don’t build dEQP by default.
build_angle_gles1_conform_tests
Current value (from the default) = false
From //third_party/angle/src/tests/BUILD.gn:20
build_devil_arm_deps
Current value (from the default) = false
From //build/secondary/third_party/catapult/devil/devil_arm.gni:8
Whether to build Devil host dependencies for Linux arm, e.g. for use on
Raspberry Pis.
build_display_configuration
Current value (from the default) = false
From //ui/display/display.gni:7
Build Chrome OS display configuration code.
build_libsrtp_tests
Current value (from the default) = false
From //third_party/libsrtp/BUILD.gn:10
Tests may not be appropriate for some build environments, e.g. Windows.
Rather than enumerate valid options, we just let clients ask for them.
build_sfntly_samples
Current value (from the default) = false
From //third_party/sfntly/BUILD.gn:9
Flip to true to build sfntly sample programs.
build_with_mozilla
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:87
Enable to use the Mozilla internal settings.
cc_wrapper
Current value (from the default) = “”
From //build/toolchain/cc_wrapper.gni:36
Set to “ccache”, “icecc” or “distcc”. Probably doesn’t work on windows.
chrome_pgo_phase
Current value (from the default) = 0
From //build/config/compiler/pgo/pgo.gni:13
Specify the current PGO phase.
Here’s the different values that can be used:
0 : Means that PGO is turned off.
1 : Used during the PGI (instrumentation) phase.
2 : Used during the PGO (optimization) phase.
TODO(sebmarchand): Add support for the PGU (update) phase.
clang_base_path
Current value (from the default) = “//third_party/llvm-build/Release+Asserts”
From //build/config/clang/clang.gni:14
clang_sample_profile_path
Current value (from the default) = “”
From //build/config/compiler/BUILD.gn:112
Path to an AFDO profile to use while building with clang, if any. Empty
implies none.
clang_use_chrome_plugins
Current value (from the default) = true
From //build/config/clang/clang.gni:12
Indicates if the build should use the Chrome-specific plugins for enforcing
coding guidelines, etc. Only used when compiling with Clang.
clang_use_default_sample_profile
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:120
Some configurations have default sample profiles. If this is true and
clang_sample_profile_path is empty, we’ll fall back to the default.
We currently only have default profiles for Chromium in-tree, so we disable
this by default for all downstream projects, since these profiles are likely
nonsensical for said projects.
clang_version
Current value (from the default) = “7.0.0”
From //build/toolchain/toolchain.gni:51
Clang compiler version. Clang files are placed at version-dependent paths.
closure_compile
Current value (from the default) = false
From //ui/webui/webui_features.gni:14
Enable closure type-checking for Chrome’s web technology-based UI. This
enables the webui_closure_compile target which does a no-op without this
flag enabled. Requires Java.
com_init_check_hook_disabled
Current value (from the default) = false
From //base/BUILD.gn:52
Set to true to disable COM init check hooks.
compiler_timing
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:124
Turn this on to have the compiler output extra timing information.
compute_grit_inputs_for_analyze
Current value (from the default) = false
From //tools/grit/grit_rule.gni:106
When set, this will fork out to grit at GN-time to get all inputs
referenced by the .grd file.
Normal builds don’t need this since proper incremental builds are handled
by grit writing out the inputs in .d files at build-time. But for analyze
to work on the bots, it needs to know about all input files at GN-time so
it knows which tests to trigger when something changes. This option will
slow down the GN run.
concurrent_links
Current value (from the default) = -1
From //build/toolchain/concurrent_links.gni:19
Limit the number of concurrent links; we often want to run fewer
links at once than we do compiles, because linking is memory-intensive.
The default to use varies by platform and by the amount of memory
available, so we call out to a script to get the right value.
content_shell_product_name
Current value (from the default) = “Content Shell”
From //content/shell/BUILD.gn:28
content_shell_version
Current value (from the default) = “99.77.34.5”
From //content/shell/BUILD.gn:29
crashpad_dependencies
Current value = “chromium”
From //.gn:69
Overridden from the default = “standalone”
From //third_party/crashpad/crashpad/build/crashpad_buildconfig.gni:19
Determines various flavors of build configuration, and which concrete
targets to use for dependencies. Valid values are “standalone”, “chromium”,
and “fuchsia”.
current_cpu
Current value (from the default) = “”
(Internally set; try `gn help current_cpu`.)
current_os
Current value (from the default) = “”
(Internally set; try `gn help current_os`.)
custom_toolchain
Current value (from the default) = “”
From //build/config/BUILDCONFIG.gn:144
Allows the path to a custom target toolchain to be injected as a single
argument, and set as the default toolchain.
dcheck_always_on
Current value = true
From //out/my_x86_d/args.gn:17
Overridden from the default = false
From //build/config/dcheck_always_on.gni:14
Set to true to enable dcheck in Release builds.
dcheck_is_configurable
Current value (from the default) = false
From //build/config/dcheck_always_on.gni:9
Enables DCHECKs to be built-in, but to default to being non-fatal/log-only.
DCHECKS can then be set as fatal/non-fatal via the DCheckIsFatal feature.
See crbug.com/596231 for details on how this is used.
debug_devtools
Current value (from the default) = false
From //third_party/blink/public/public_features.gni:12
If debug_devtools is set to true, JavaScript files for DevTools are stored
as is and loaded from disk. Otherwise, a concatenated file is stored in
resources.pak. It is still possible to load JS files from disk by passing
–debug-devtools cmdline switch.
disable_brotli_filter
Current value (from the default) = false
From //net/features.gni:27
Do not disable brotli filter by default.
disable_file_support
Current value (from the default) = false
From //net/features.gni:12
Disables support for file URLs. File URL support requires use of icu.
disable_ftp_support
Current value (from the default) = false
From //net/features.gni:17
disable_libfuzzer
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:91
Helper variable for testing builds with disabled libfuzzer.
Not for client use.
enable_ac3_eac3_audio_demuxing
Current value (from the default) = false
From //media/media_options.gni:56
Enables AC3/EAC3 audio demuxing. This is enabled only on Chromecast, since
it only provides demuxing, and is only useful for AC3/EAC3 audio
pass-through to HDMI sink on Chromecast.
enable_app_list
Current value (from the default) = false
From //chrome/common/features.gni:23
enable_app_shell_installer
Current value (from the default) = false
From //extensions/shell/installer/BUILD.gn:15
enable_arcore
Current value (from the default) = false
From //device/vr/buildflags/buildflags.gni:44
TODO(crbug.com/841389): We should eventually have a single flag for
enabling arcore, but we currently don’t support ARCore in 64bit, and we do
not support all channels. This flag governs the inclusion of code that must
be identical across configs.
enable_av1_decoder
Current value (from the default) = false
From //third_party/libaom/options.gni:5
Enable decoding AV1 video files.
enable_background_contents
Current value (from the default) = true
From //chrome/common/features.gni:26
Enables support for background apps.
enable_background_mode
Current value (from the default) = true
From //chrome/common/features.gni:27
enable_basic_print_dialog
Current value (from the default) = true
From //chrome/common/features.gni:31
Enable the printing system dialog for platforms that support printing
and have a system dialog.
enable_basic_printing
Current value (from the default) = true
From //printing/buildflags/buildflags.gni:10
Enable basic printing support and UI.
enable_blink_heap_incremental_marking
Current value (from the default) = true
From //third_party/blink/renderer/platform/heap/BUILD.gn:15
Build Blink with incremental marking infrastructure for Oilpan.
To turn on incremental marking also use
–enable-blink-features=HeapIncrementalMarking
enable_blink_heap_verification
Current value (from the default) = false
From //third_party/blink/renderer/platform/heap/BUILD.gn:18
Enables heap verification.
enable_callgrind
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:54
Enable callgrind for performance profiling
enable_captive_portal_detection
Current value (from the default) = true
From //chrome/common/features.gni:33
enable_cbcs_encryption_scheme
Current value (from the default) = true
From //media/media_options.gni:65
Enable parsing for the ‘cbcs’ encryption scheme added by MPEG Common
Encryption 3rd Edition (ISO/IEC 23001-7), published 02/15/2016.
enable_cdm_host_verification
Current value (from the default) = false
From //media/media_options.gni:149
enable_cdm_storage_id
Current value (from the default) = false
From //media/media_options.gni:153
Enable Storage ID which is used by CDMs. This is only available with chrome
branding, but may be overridden by other embedders.
enable_cros_assistant
Current value (from the default) = false
From //chromeos/assistant/assistant.gni:4
Enable assistant features. Assistant related code is compiled only when
true. The default assistant implementation is a stub.
enable_cros_libassistant
Current value (from the default) = false
From //chromeos/assistant/assistant.gni:8
Enable assistant implementation based on libassistant. This requires
enable_cros_assistant also enabled.
enable_cros_libassistant_so
Current value (from the default) = false
From //chromeos/assistant/assistant.gni:12
Enable building libassistant.so shared library from local checkout. This is
for development purposes only.
enable_debugallocation
Current value (from the default) = true
From //base/allocator/BUILD.gn:13
Provide a way to force disable debugallocation in Debug builds,
e.g. for profiling (it’s more rare to profile Debug builds,
but people sometimes need to do that).
enable_desktop_in_product_help
Current value (from the default) = true
From //components/feature_engagement/features.gni:9
In-Product Help is only available in Windows and Linux OS for
desktop. Other platforms such as Mac OS currently does not support
Views and there have been no strong feelings about CrOS.
enable_dolby_vision_demuxing
Current value (from the default) = false
From //media/media_options.gni:74
Enable Dolby Vision demuxing. Enable by default for Chromecast. Actual
decoding must be provided by the platform. Note some Dolby Vision profiles
which are encoded using HEVC require |enable_hevc_demuxing| to be enabled.
enable_extensions
Current value (from the default) = true
From //extensions/buildflags/buildflags.gni:8
enable_feed_in_chrome
Current value (from the default) = false
From //components/feed/features.gni:6
enable_ffmpeg_video_decoders
Current value (from the default) = true
From //media/media_options.gni:118
On Android, FFMpeg is built without video decoders by default.
This flag gives the option to override that decision in case there are no
hardware decoders. To do so, you will also need to update ffmpeg build files
in order to define which decoders to build in.
enable_full_stack_frames_for_profiling
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:64
Compile in such a way as to make it possible for the profiler to unwind full
stack frames. Setting this flag has a large effect on the performance of the
generated code than just setting profiling, but gives the profiler more
information to analyze.
Requires profiling to be set to true.
enable_google_now
Current value (from the default) = false
From //chrome/common/features.gni:37
Google Now is disabled to prepare for its removal.
http://crbug.com/539674
enable_gvr_services
Current value (from the default) = false
From //device/vr/buildflags/buildflags.gni:13
TODO(733935): Enable for other Android architectures too. Currently we only
support arm and arm64.
enable_hangout_services_extension
Current value (from the default) = false
From //chrome/common/features.gni:41
Hangout services is an extension that adds extra features to Hangouts.
It is enableable separately to facilitate testing.
enable_hevc_demuxing
Current value (from the default) = false
From //media/media_options.gni:69
Enable HEVC/H265 demuxing. Actual decoding must be provided by the
platform. Enable by default for Chromecast.
enable_hls_sample_aes
Current value (from the default) = false
From //media/media_options.gni:77
Enable HLS with SAMPLE-AES decryption.
enable_internal_app_remoting_targets
Current value (from the default) = false
From //remoting/remoting_options.gni:18
Set this to enable building internal AppRemoting apps.
enable_ipc_fuzzer
Current value (from the default) = false
From //tools/ipc_fuzzer/ipc_fuzzer.gni:15
enable_ipc_logging
Current value (from the default) = true
From //ipc/features.gni:7
Enabling debug builds automatically sets enable_ipc_logging to true.
enable_iterator_debugging
Current value (from the default) = true
From //build/config/BUILD.gn:36
When set (the default) enables C++ iterator debugging in debug builds.
Iterator debugging is always off in release builds (technically, this flag
affects the “debug” config, which is always available but applied by
default only in debug builds).
Iterator debugging is generally useful for catching bugs. But it can
introduce extra locking to check the state of an iterator against the state
of the current object. For iterator- and thread-heavy code, this can
significantly slow execution.
enable_linux_installer
Current value (from the default) = false
From //chrome/installer/BUILD.gn:11
enable_location_source
Current value (from the default) = true
From //base/BUILD.gn:44
Indicates if the Location object contains the source code information
(file, function, line). False means only the program counter (and currently
file name) is saved.
enable_mdns
Current value (from the default) = true
From //net/features.gni:30
Multicast DNS.
enable_media_remoting
Current value (from the default) = true
From //media/media_options.gni:241
This switch defines whether the Media Remoting implementation will be built.
When enabled, media is allowed to be renderer and played back on remote
devices when the tab is being casted and other conditions are met.
enable_media_remoting_rpc
Current value (from the default) = true
From //media/media_options.gni:247
Media Remoting RPC is disabled on Android since it’s unused but increases
the native binary size by ~70Kb.
enable_media_router_jscompile
Current value (from the default) = false
From //chrome/browser/resources/media_router/extension/BUILD.gn:12
Determines whether JSCompiler should be used to typecheck
JavaScript code for the Media Router extension.
enable_message_center
Current value (from the default) = true
From //ui/base/ui_features.gni:18
Whether the message center should be included for displaying notifications.
enable_mojo_media
Current value (from the default) = true
From //media/media_options.gni:132
enable_mojo_tracing
Current value (from the default) = false
From //mojo/public/cpp/bindings/BUILD.gn:7
enable_mojom_message_id_scrambling
Current value (from the default) = true
From //mojo/public/tools/bindings/mojom.gni:33
Controls message ID scrambling behavior. If |true|, message IDs are
scrambled (i.e. randomized based on the contents of //chrome/VERSION) on
non-Chrome OS desktop platforms. Set to |false| to disable message ID
scrambling on all platforms.
enable_mojom_typemapping
Current value (from the default) = true
From //mojo/public/tools/bindings/mojom.gni:27
Indicates whether typemapping should be supported in this build
configuration. This may be disabled when building external projects which
depend on //mojo but which do not need/want all of the Chromium tree
dependencies that come with typemapping.
Note that (perhaps obviously) a huge amount of Chromium code will not build
with typemapping disabled, so it is never valid to set this to |false| in
any Chromium build configuration.
enable_mpeg_h_audio_demuxing
Current value (from the default) = false
From //media/media_options.gni:58
enable_mse_mpeg2ts_stream_parser
Current value (from the default) = false
From //media/media_options.gni:61
enable_mus
Current value (from the default) = false
From //ui/base/ui_features.gni:21
Set to true to if mus (aka the window service) is enabled.
enable_mutex_priority_inheritance
Current value (from the default) = false
From //base/BUILD.gn:57
Set to true to enable mutex priority inheritance. See the comments in
LockImpl::PriorityInheritanceAvailable() in lock_impl_posix.cc for the
platform requirements to safely enable priority inheritance.
enable_nacl
Current value = false
From //out/my_x86_d/args.gn:18
Overridden from the default = true
From //components/nacl/features.gni:13
enable_nacl_nonsfi
Current value (from the default) = true
From //components/nacl/features.gni:18
Non-SFI is not yet supported on mipsel
enable_native_notifications
Current value (from the default) = true
From //chrome/common/features.gni:44
Enables usage of the system-provided notification center.
enable_native_window_nav_buttons
Current value (from the default) = false
From //ui/views/features.gni:12
enable_net_mojo
Current value (from the default) = true
From //net/features.gni:45
enable_nocompile_tests
Current value (from the default) = false
From //build/nocompile.gni:63
enable_oculus_vr
Current value (from the default) = false
From //device/vr/buildflags/buildflags.gni:20
To build with Oculus support, the Oculus SDK for Windows will need to be
installed in third_party/libovr/src. See
third_party/libovr/README.chromium for details.
enable_offline_pages
Current value (from the default) = false
From //components/offline_pages/buildflags/features.gni:8
Whether to enable OfflinePages support. Currently user-visible features
are Android-only.
enable_offline_pages_harness
Current value (from the default) = false
From //components/offline_pages/buildflags/features.gni:12
This enables test API for locally-built harness which is used for quality
evaluations. Requires setting this variable manually at local environment.
enable_one_click_signin
Current value (from the default) = true
From //chrome/common/features.gni:48
enable_openvr
Current value (from the default) = true
From //device/vr/buildflags/buildflags.gni:15
enable_pdf
Current value (from the default) = true
From //pdf/features.gni:12
enable_plugins
Current value (from the default) = true
From //ppapi/buildflags/buildflags.gni:10
enable_precompiled_headers
Current value (from the default) = true
From //build/config/pch.gni:11
Precompiled header file support is by default available,
but for distributed build system uses (like goma) or when
doing official builds.
enable_print_preview
Current value (from the default) = true
From //printing/buildflags/buildflags.gni:16
Enable printing with print preview. It implies enable_basic_printing.
Note: It would be convenient to not repeat many of the same conditions in
enable_basic_printing below. However, GN does not allow the use of
enable_basic_printing within the same declare_args() block.
enable_profiling
Current value (from the default) = false
From //build/config/compiler/compiler.gni:30
Compile in such a way as to enable profiling of the generated code. For
example, don’t omit the frame pointer and leave in symbols.
enable_reading_list
Current value (from the default) = true
From //components/reading_list/features/reading_list.gni:8
Controls whether reading list support is active or not. Currently only
supported on iOS (on other platforms, the feature is always disabled).
enable_remoting
Current value (from the default) = true
From //remoting/remoting_enable.gni:12
enable_remoting_jscompile
Current value (from the default) = false
From //remoting/remoting_options.gni:15
Set this to run the jscompile checks after building the webapp.
enable_reporting
Current value (from the default) = true
From //net/features.gni:33
Reporting not used on iOS.
enable_resource_whitelist_generation
Current value (from the default) = false
From //build/config/android/config.gni:373
Enables used resource whitelist generation. Set for official builds only
as a large amount of build output is generated.
enable_runtime_media_renderer_selection
Current value (from the default) = false
From //media/media_options.gni:144
When enabled, this feature allows developers to use a runtime flag to
choose the implementation of the renderer that is used. On a build which
enables the mojo renderer, if –disable-mojo-renderer is passed at start-up,
the “default” renderer will be used instead. Both renderer implementations
will be linked if this feature is enabled, increasing the binary size. This
feature does not make sense if the mojo renderer is not enabled.
enable_service_discovery
Current value (from the default) = true
From //chrome/common/features.gni:50
enable_session_service
Current value (from the default) = true
From //chrome/common/features.gni:54
Enables use of the session service, which is enabled by default.
Android stores them separately on the Java side.
enable_supervised_users
Current value (from the default) = true
From //chrome/common/features.gni:56
enable_swiftshader
Current value (from the default) = true
From //ui/gl/BUILD.gn:15
enable_test_mojo_media_client
Current value (from the default) = false
From //media/media_options.gni:136
Enable the TestMojoMediaClient to be used in mojo MediaService. This is for
testing only and will override the default platform MojoMediaClient, if any.
enable_vr
Current value (from the default) = true
From //device/vr/buildflags/buildflags.gni:28
enable_vulkan
Current value (from the default) = false
From //gpu/vulkan/features.gni:9
Enable experimental vulkan backend.
enable_wayland_server
Current value (from the default) = false
From //chrome/common/features.gni:59
Indicates if Wayland display server support is enabled.
enable_websockets
Current value (from the default) = true
From //net/features.gni:16
WebSockets and socket stream code are not used on iOS and are optional in
cronet.
enable_widevine
Current value (from the default) = false
From //third_party/widevine/cdm/widevine.gni:10
Allow Widevine key system support in Chromium.
enable_wifi_display
Current value (from the default) = false
From //extensions/buildflags/buildflags.gni:12
Enables Wi-Fi Display functionality
WARNING: This enables MPEG Transport Stream (MPEG-TS) encoding!
fatal_linker_warnings
Current value (from the default) = true
From //build/config/compiler/BUILD.gn:80
Enable fatal linker warnings. Building Chromium with certain versions
of binutils can cause linker warning.
See: https://bugs.chromium.org/p/chromium/issues/detail?id=457359
ffmpeg_branding
Current value (from the default) = “Chromium”
From //third_party/ffmpeg/ffmpeg_options.gni:34
Controls whether we build the Chromium or Google Chrome version of FFmpeg.
The Google Chrome version contains additional codecs. Typical values are
Chromium, Chrome, and ChromeOS.
ffmpeg_use_atomics_fallback
Current value (from the default) = false
From //third_party/ffmpeg/ffmpeg_options.gni:51
Set to true to force the use of ffmpeg’s stdatomic fallback code.
Windows and GCC prior to 4.9 lack stdatomic.h.
This is also useful for developers who use icecc, which relies upon
clang’s -frewrite-includes flag which is broken with #include_next
directives as used in chromium’s clang stdatomic.h.
Some background: https://bugs.llvm.org/show_bug.cgi?id=26828
fieldtrial_testing_like_official_build
Current value (from the default) = false
From //build/config/features.gni:46
Set to true make a build that disables activation of field trial tests
specified in testing/variations/fieldtrial_testing_config_*.json.
Note: this setting is ignored if is_chrome_branded.
full_wpo_on_official
Current value (from the default) = false
From //build/config/compiler/compiler.gni:156
generate_linker_map
Current value (from the default) = false
From //build/toolchain/toolchain.gni:28
Used for binary size analysis.
Currently disabled on LLD because of a bug (fixed upstream).
See https://crbug.com/716209.
generate_order_files
Current value (from the default) = false
From //build/config/chrome_build.gni:17
Turn this on to generate order files. See
https://chromium.googlesource.com/chromium/src/+/master/docs/win_order_files.md
gold_path
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:68
When we are going to use gold we need to find it.
This is initialized below, after use_gold might have been overridden.
goma_dir
Current value (from the default) = “C:\src\goma\goma-win64”
From //build/toolchain/goma.gni:14
Absolute directory containing the gomacc.exe binary.
google_api_key
Current value (from the default) = “”
From //google_apis/BUILD.gn:46
Set these to bake the specified API keys and OAuth client
IDs/secrets into your build.
If you create a build without values baked in, you can instead
set environment variables to provide the keys at runtime (see
src/google_apis/google_api_keys.h for details). Features that
require server-side APIs may fail to work if no keys are
provided.
Note that if you are building an official build or if
use_official_google_api_keys has been set to trie (explicitly or
implicitly), these values will be ignored and the official
keys will be used instead.
google_default_client_id
Current value (from the default) = “”
From //google_apis/BUILD.gn:49
See google_api_key.
google_default_client_secret
Current value (from the default) = “”
From //google_apis/BUILD.gn:52
See google_api_key.
has_native_accessibility
Current value (from the default) = true
From //ui/base/ui_features.gni:15
Whether the platform provides a native accessibility toolkit.
headless_fontconfig_utils
Current value (from the default) = false
From //headless/headless.gni:10
Provide bindings for font loading for headless embedders.
headless_use_embedded_resources
Current value (from the default) = false
From //headless/headless.gni:7
Embed resource.pak file into the binary for easier distribution.
host_byteorder
Current value (from the default) = “undefined”
From //build/config/host_byteorder.gni:9
host_cpu
Current value (from the default) = “x64”
(Internally set; try `gn help host_cpu`.)
host_os
Current value (from the default) = “win”
(Internally set; try `gn help host_os`.)
host_pkg_config
Current value (from the default) = “”
From //build/config/linux/pkg_config.gni:36
A optional pkg-config wrapper to use for tools built on the host.
host_toolchain
Current value (from the default) = “”
From //build/config/BUILDCONFIG.gn:148
This should not normally be set as a build argument. It’s here so that
every toolchain can pass through the “global” value via toolchain_args().
icu_use_data_file
Current value (from the default) = true
From //third_party/icu/config.gni:15
Tells icu to load an external data file rather than rely on the icudata
being linked directly into the binary.
This flag is a bit confusing. As of this writing, icu.gyp set the value to
0 but common.gypi sets the value to 1 for most platforms (and the 1 takes
precedence).
TODO(GYP) We’ll probably need to enhance this logic to set the value to
true or false in similar circumstances.
ignore_elf32_limitations
Current value (from the default) = false
From //build_overrides/build.gni:41
Android 32-bit non-component, non-clang builds cannot have symbol_level=2
due to 4GiB file size limit, see https://crbug.com/648948.
Set this flag to true to skip the assertion.
include_transport_security_state_preload_list
Current value (from the default) = true
From //net/features.gni:41
Includes the transport security state preload list. This list includes
mechanisms (e.g. HSTS, HPKP) to enforce trusted connections to a significant
set of hardcoded domains. While this list has a several hundred KB of binary
size footprint, this flag should not be disabled unless the embedder is
willing to take the responsibility to make sure that all important
connections use HTTPS.
include_vr_data
Current value (from the default) = false
From //device/vr/buildflags/buildflags.gni:32
Whether to include VR extras like test APKs in non-VR-specific targets
internal_gles2_conform_tests
Current value (from the default) = false
From //gpu/gles2_conform_support/BUILD.gn:7
Set to true to compile with the OpenGL ES 2.0 conformance tests.
internal_khronos_glcts_tests
Current value (from the default) = false
From //gpu/khronos_glcts_support/BUILD.gn:8
ios_deployment_target
Current value (from the default) = “10.0”
From //build/config/ios/ios_sdk_overrides.gni:10
Version of iOS that we’re targeting.
is_asan
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:11
Compile for Address Sanitizer to find memory bugs.
is_cast_audio_only
Current value (from the default) = false
From //build/config/chromecast_build.gni:14
Set this true for an audio-only Chromecast build.
is_cast_desktop_build
Current value (from the default) = false
From //build/config/chromecast_build.gni:26
True if Chromecast build is targeted for linux desktop. This type of build
is useful for testing and development, but currently supports only a subset
of Cast functionality. Though this defaults to true for x86 Linux devices,
this should be overriden manually for an embedded x86 build.
TODO(slan): Remove instances of this when x86 is a fully supported platform.
is_cast_using_cma_backend
Current value (from the default) = true
From //media/media_options.gni:80
If true, use cast CMA backend instead of default chromium media pipeline.
is_cfi
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:53
Compile with Control Flow Integrity to protect virtual calls and casts.
See http://clang.llvm.org/docs/ControlFlowIntegrity.html
TODO(pcc): Remove this flag if/when CFI is enabled in all official builds.
is_chrome_branded
Current value (from the default) = false
From //build/config/chrome_build.gni:9
Select the desired branding flavor. False means normal Chromium branding,
true means official Google Chrome branding (requires extra Google-internal
resources).
is_chromecast
Current value (from the default) = false
From //build/config/chromecast_build.gni:11
Set this true for a Chromecast build. Chromecast builds are supported on
Linux and Android.
is_clang
Current value (from the default) = true
From //build/config/BUILDCONFIG.gn:137
Set to true when compiling with the Clang compiler.
is_component_build
Current value = true
From //out/my_x86_d/args.gn:15
Overridden from the default = true
From //build/config/BUILDCONFIG.gn:165
Component build. Setting to true compiles targets declared as “components”
as shared libraries loaded dynamically. This speeds up development time.
When false, components will be linked statically.
For more information see
https://chromium.googlesource.com/chromium/src/+/master/docs/component_build.md
is_component_ffmpeg
Current value (from the default) = true
From //third_party/ffmpeg/ffmpeg_options.gni:41
Set true to build ffmpeg as a shared library. NOTE: this means we should
always consult is_component_ffmpeg instead of is_component_build for
ffmpeg targets. This helps linux chromium packagers that swap out our
ffmpeg.so with their own. See discussion here
https://groups.google.com/a/chromium.org/forum/#!msg/chromium-packagers/R5rcZXWxBEQ/B6k0zzmJbvcJ
is_debug
Current value = true
From //out/my_x86_d/args.gn:22
Overridden from the default = true
From //build/config/BUILDCONFIG.gn:155
Debug build. Enabling official builds automatically sets is_debug to false.
is_desktop_linux
Current value (from the default) = false
From //build/config/BUILDCONFIG.gn:134
Whether we’re a traditional desktop unix.
is_lsan
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:14
Compile for Leak Sanitizer to find leaks.
is_msan
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:17
Compile for Memory Sanitizer to find uninitialized reads.
is_multi_dll_chrome
Current value (from the default) = false
From //build/config/chrome_build.gni:13
Break chrome.dll into multple pieces based on process type. Only available
on Windows.
is_nacl_glibc
Current value (from the default) = false
From //build/config/nacl/config.gni:9
Native Client supports both Newlib and Glibc C libraries where Newlib
is assumed to be the default one; use this to determine whether Glibc
is being used instead.
is_official_build
Current value (from the default) = false
From //build/config/BUILDCONFIG.gn:131
Set to enable the official build level of optimization. This has nothing
to do with branding, but enables an additional level of optimization above
release (!is_debug). This might be better expressed as a tri-state
(debug, release, official) but for historical reasons there are two
separate flags.
is_proto_quic
Current value (from the default) = false
From //net/features.gni:9
If true, prune things down as needed for proto-quic build.
is_tsan
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:20
Compile for Thread Sanitizer to find threading bugs.
is_ubsan
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:24
Compile for Undefined Behaviour Sanitizer to find various types of
undefined behaviour (excludes vptr checks).
is_ubsan_no_recover
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:27
Halt the program if a problem is detected.
is_ubsan_null
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:30
Compile for Undefined Behaviour Sanitizer’s null pointer checks.
is_ubsan_security
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:83
Enables core ubsan security features. Will later be removed once it matches
is_ubsan.
is_ubsan_vptr
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:33
Compile for Undefined Behaviour Sanitizer’s vptr checks.
is_unsafe_developer_build
Current value (from the default) = true
From //base/BUILD.gn:49
Unsafe developer build. Has developer-friendly features that may weaken or
disable security measures like sandboxing or ASLR.
IMPORTANT: Unsafe developer builds should never be distributed to end users.
is_win_fastlink
Current value = false
From //out/my_x86_d/args.gn:23
Overridden from the default = false
From //build/config/compiler/compiler.gni:51
Tell VS to create a PDB that references information in .obj files rather
than copying it all. This should improve linker performance. mspdbcmf.exe
can be used to convert a fastlink pdb to a normal one.
jumbo_build_excluded
Current value (from the default) = []
From //build/config/jumbo.gni:15
A list of targets to exclude from jumbo builds, for optimal round trip time
when frequently changing a set of cpp files.
jumbo_file_merge_limit
Current value (from the default) = -1
From //build/config/jumbo.gni:31
How many files to group at most. Smaller numbers give more
parallellism, higher numbers give less total CPU usage. Higher
numbers also give longer single-file recompilation times.
Recommendations:
Higher numbers than 100 does not reduce wall clock compile times
even for 4 cores or less so no reason to go higher than 100.
Going from 50 to 100 with a 4 core CPU saves about 3% CPU time and
3% wall clock time in a tree with blink, v8 and content
jumbofied. At the same time it increases the compile time for the
largest jumbo chunks by 10-20% and reduces the chance to use all
available CPU cores. So set the default to 50 to balance between
high and low-core build performance. -1 means do the default which
varies depending on whether goma is enabled.
libcpp_is_static
Current value (from the default) = false
From //build/config/c++/c++.gni:33
ASan, MSan and TSan builds need to override operator new, operator delete,
and some exception handling symbols, so libc++ must be a shared library to
prevent duplicate symbol errors when linking.
Additionally, -fsanitize=vptr requires libc++ to be a shared library
because the ubsan runtime library that implements -fsanitize=vptr calls
dynamic_cast with the ABI type info classes, which won’t return the right
answer if each DSO has its own copy of the ABI classes.
libyuv_disable_jpeg
Current value (from the default) = false
From //third_party/libyuv/libyuv.gni:15
libyuv_include_tests
Current value (from the default) = false
From //third_party/libyuv/libyuv.gni:14
libyuv_symbols_visible
Current value (from the default) = false
From //third_party/libyuv/BUILD.gn:19
When building a shared library using a target in WebRTC or
Chromium projects that depends on libyuv, setting this flag
to true makes libyuv symbols visible inside that library.
libyuv_use_gflags
Current value (from the default) = true
From //third_party/libyuv/BUILD.gn:14
Set to false to disable building with gflags.
libyuv_use_msa
Current value (from the default) = false
From //third_party/libyuv/libyuv.gni:18
libyuv_use_neon
Current value (from the default) = false
From //third_party/libyuv/libyuv.gni:16
link_pulseaudio
Current value (from the default) = false
From //media/media_options.gni:33
Allows distributions to link pulseaudio directly (DT_NEEDED) instead of
using dlopen. This helps with automated detection of ABI mismatches and
prevents silent errors.
linux_use_bundled_binutils
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:54
llvm_force_head_revision
Current value (from the default) = false
From //build/toolchain/toolchain.gni:18
If this is set to true, or if LLVM_FORCE_HEAD_REVISION is set to 1
in the environment, we use the revision in the llvm repo to determine
the CLANG_REVISION to use, instead of the version hard-coded into
//tools/clang/scripts/update.py. This should only be used in
conjunction with setting LLVM_FORCE_HEAD_REVISION in the
environment when `gclient runhooks` is run as well.
mac_sdk_min
Current value (from the default) = “10.12”
From //build/config/mac/mac_sdk_overrides.gni:12
mac_views_browser
Current value (from the default) = false
From //ui/base/ui_features.gni:12
Whether the entire browser uses toolkit-views on Mac instead of Cocoa.
media_use_ffmpeg
Current value (from the default) = true
From //media/media_options.gni:38
Enable usage of FFmpeg within the media library. Used for most software
based decoding, demuxing, and sometimes optimized FFTs. If disabled,
implementors must provide their own demuxers and decoders.
media_use_libvpx
Current value (from the default) = true
From //media/media_options.gni:42
Enable usage of libvpx within the media library. Used for software based
decoding of VP9 and VP8A type content.
mojo_media_host
Current value (from the default) = “none”
From //media/media_options.gni:198
The process that the mojo MediaService runs in. By default, all services
registered in |mojo_media_services| are hosted in the MediaService, with the
exception that when |enable_library_cdms| is true, the “cdm” service will
run in a separate CdmService in the CDM (utility) process, while other
|mojo_media_services| still run in the MediaService in the process specified
by “mojo_media_host”.
Valid options are:
– “none”: Do not use mojo media service.
– “browser”: Use mojo media service hosted in the browser process.
– “gpu”: Use mojo media service hosted in the gpu process.
– “utility”: Use mojo media service hosted in the utility process.
mojo_media_services
Current value (from the default) = []
From //media/media_options.gni:185
A list of mojo media services that should be used in the media pipeline.
Must not be empty if |enable_mojo_media| is true.
Valid entries in the list are:
– “renderer”: Use mojo-based media Renderer service.
– “cdm”: Use mojo-based Content Decryption Module.
– “audio_decoder”: Use mojo-based audio decoder in the default media
Renderer. Cannot be used with the mojo Renderer above.
– “video_decoder”: Use mojo-based video decoder in the default media
Renderer. Cannot be used with the mojo Renderer above.
mojom_message_id_salt_path
Current value (from the default) = “//chrome/VERSION”
From //mojo/public/tools/bindings/mojom.gni:80
The path to a file whose contents can be used as the basis for a message
ID scrambling salt.
mojom_message_id_salt_suffix_path
Current value (from the default) = “”
From //mojo/public/tools/bindings/mojom.gni:90
msan_track_origins
Current value (from the default) = 2
From //build/config/sanitizers/sanitizers.gni:38
Track where uninitialized memory originates from. From fastest to slowest:
0 – no tracking, 1 – track only the initial allocation site, 2 – track the
chain of stores leading from allocation site to use site.
msvc_use_absolute_paths
Current value (from the default) = false
From //build/toolchain/toolchain.gni:32
Use absolute file paths in the compiler diagnostics and __FILE__ macro
if needed.
msvs_xtree_patched
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:74
Whether the VS xtree header has been patched to disable warning 4702. If
it has, then we don’t need to disable 4702 (unreachable code warning).
The patch is preapplied to the internal toolchain and hence all bots.
ndk_supports_nativewindow
Current value (from the default) = false
From //third_party/angle/gni/angle.gni:42
ndk_supports_vulkan
Current value (from the default) = false
From //third_party/angle/gni/angle.gni:41
optimize_for_fuzzing
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:95
Optimize for coverage guided fuzzing (balance between speed and number of
branches)
optimize_webui
Current value (from the default) = false
From //ui/webui/webui_features.gni:9
Optimize parts of Chrome’s UI written with web technologies (HTML/CSS/JS)
for runtime performance purposes. This does more work at compile time for
speed benefits at runtime (so we skip in debug builds).
override_build_date
Current value (from the default) = “N/A”
From //base/BUILD.gn:39
Override this value to give a specific build date.
See //base/build_time.cc and //build/write_build_date_header.py for more
details and the expected format.
ozone_auto_platforms
Current value (from the default) = false
From //ui/ozone/ozone.gni:10
Select platforms automatically. Turn this off for manual control.
ozone_platform
Current value (from the default) = “”
From //ui/ozone/ozone.gni:16
The platform that will used at runtime by default. This can be overridden
with the command line flag –ozone-platform=<platform>.
ozone_platform_cast
Current value (from the default) = false
From //ui/ozone/ozone.gni:19
Compile the ‘cast’ platform.
ozone_platform_gbm
Current value (from the default) = false
From //ui/ozone/ozone.gni:22
Compile the ‘gbm’ platform.
ozone_platform_headless
Current value (from the default) = false
From //ui/ozone/ozone.gni:25
Compile the ‘headless’ platform.
ozone_platform_wayland
Current value (from the default) = false
From //ui/ozone/ozone.gni:31
Compile the ‘wayland’ platform.
ozone_platform_windows
Current value (from the default) = false
From //ui/ozone/ozone.gni:34
Compile the ‘windows’ platform.
ozone_platform_x11
Current value (from the default) = false
From //ui/ozone/ozone.gni:28
Compile the ‘x11’ platform.
package_arcore
Current value (from the default) = false
From //device/vr/buildflags/buildflags.gni:37
TODO(crbug.com/837999, crbug.com/841389): We currently only support arm and
we are limiting to canary and dev until binary size issues are resolved.
TODO(crbug.com/845080): add android_channel == “dev” || “canary”
pdf_bundle_freetype
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:16
Build PDFium either:
1) When set to true, with a bundled FreeType, built from FreeType source
code in //third_party/freetype and PDFium’s FreeType configs in
third_party/freetype/include.
2) When set to false, use whatever FreeType target is defined in
//build/config/freetype.
pdf_enable_v8
Current value (from the default) = true
From //third_party/pdfium/pdfium.gni:19
Build PDFium either with or without v8 support.
pdf_enable_xfa
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:22
Build PDFium either with or without XFA Forms support.
pdf_enable_xfa_bmp
Current value (from the default) = true
From //third_party/pdfium/pdfium.gni:25
If XFA, also support bmp codec. Ignored if not XFA.
pdf_enable_xfa_gif
Current value (from the default) = true
From //third_party/pdfium/pdfium.gni:28
If XFA, also support gif codec. Ignored if not XFA.
pdf_enable_xfa_png
Current value (from the default) = true
From //third_party/pdfium/pdfium.gni:31
If XFA, also support png codec. Ignored if not XFA.
pdf_enable_xfa_tiff
Current value (from the default) = true
From //third_party/pdfium/pdfium.gni:34
If XFA, also support png codec. Ignored if not XFA.
pdf_is_complete_lib
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:51
Build a complete static library
pdf_is_standalone
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:48
Build PDFium standalone
pdf_use_skia
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:38
Build PDFium against Skia (experimental) rather than AGG. Use Skia to draw
everything.
pdf_use_skia_paths
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:42
Build PDFium against Skia (experimental) rather than AGG. Use Skia to draw
paths.
pdf_use_win32_gdi
Current value (from the default) = true
From //third_party/pdfium/pdfium.gni:45
Build PDFium with or without experimental win32 GDI APIs.
pgo_build
Current value (from the default) = false
From //chrome/common/features.gni:62
Indicates if the build is using PGO.
pgo_data_path
Current value (from the default) = “”
From //build/config/compiler/pgo/pgo.gni:16
When using chrome_pgo_phase = 2, read profile data from this path.
pkg_config
Current value (from the default) = “”
From //build/config/linux/pkg_config.gni:33
A pkg-config wrapper to call instead of trying to find and call the right
pkg-config directly. Wrappers like this are common in cross-compilation
environments.
Leaving it blank defaults to searching PATH for ‘pkg-config’ and relying on
the sysroot mechanism to find the right .pc files.
proprietary_codecs
Current value (from the default) = false
From //build/config/features.gni:29
Enables proprietary codecs and demuxers; e.g. H264, AAC, MP3, and MP4.
We always build Google Chrome and Chromecast with proprietary codecs.
Note: this flag is used by WebRTC which is DEPSed into Chrome. Moving it
out of //build will require using the build_overrides directory.
remove_webcore_debug_symbols
Current value = false
From //out/my_x86_d/args.gn:24
Overridden from the default = false
From //third_party/blink/renderer/config.gni:21
TODO: send a PSA out to tell people to switch to blink_symbol_level
and remove this.
If true, doesn’t compile debug symbols into webcore reducing the
size of the binary and increasing the speed of gdb.
ro_segment_workaround_for_valgrind
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:129
Set to true to pass –no-rosegment to lld. This is a workaround
for a KI issue in Valgrind,
https://bugs.kde.org/show_bug.cgi?id=384727
root_extra_deps
Current value (from the default) = []
From //BUILD.gn:37
A list of extra dependencies to add to the root target. This allows a
checkout to add additional targets without explicitly changing any checked-
in files.
rtc_audio_device_plays_sinus_tone
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:139
When set to true, replace the audio output with a sinus tone at 440Hz.
The ADM will ask for audio data from WebRTC but instead of reading real
audio samples from NetEQ, a sinus tone will be generated and replace the
real audio samples.
rtc_build_examples
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:78
Set this to false to skip building examples.
rtc_build_json
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:171
Disable these to not build components which can be externally provided.
rtc_build_libevent
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:184
rtc_build_libsrtp
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:172
rtc_build_libvpx
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:173
rtc_build_opus
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:175
rtc_build_ssl
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:176
rtc_build_tools
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:81
Set this to false to skip building tools.
rtc_build_usrsctp
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:177
rtc_build_with_neon
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:119
rtc_builtin_ssl_root_certificates
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:37
Setting this to false will require the API user to pass in their own
SSLCertificateVerifier to verify the certificates presented from a
TLS-TURN server. In return disabling this saves around 100kb in the binary.
rtc_enable_android_aaudio
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:91
Enable use of Android AAudio which requires Android SDK 26 or above and
NDK r16 or above.
rtc_enable_android_opensl
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:94
TODO(henrika): can this flag be removed?
rtc_enable_bwe_test_logging
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:75
Set this to true to enable BWE test logging.
rtc_enable_external_auth
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:68
Enable when an external authentication mechanism is used for performing
packet authentication for RTP packets instead of libsrtp.
rtc_enable_intelligibility_enhancer
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:64
Disable the code for the intelligibility enhancer by default.
rtc_enable_libevent
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:183
rtc_enable_protobuf
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:165
Enables the use of protocol buffers for debug recordings.
rtc_enable_sctp
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:168
Set this to disable building with support for SCTP data channels.
rtc_include_ilbc
Current value = false
From //.gn:65
Overridden from the default = true
From //third_party/webrtc/webrtc.gni:40
Include the iLBC audio codec?
rtc_include_internal_audio_device
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:199
Chromium uses its own IO handling, so the internal ADM is only built for
standalone WebRTC.
rtc_include_opus
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:43
Disable this to avoid building the Opus audio codec.
rtc_include_pulse_audio
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:195
Excluded in Chromium since its prerequisites don’t require Pulse Audio.
rtc_include_tests
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:202
Include tests in standalone checkout.
rtc_initialize_ffmpeg
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:150
FFmpeg must be initialized for |H264DecoderImpl| to work. This can be done
by WebRTC during |H264DecoderImpl::InitDecode| or externally. FFmpeg must
only be initialized once. Projects that initialize FFmpeg externally, such
as Chromium, must turn this flag off so that WebRTC does not also
initialize.
rtc_jsoncpp_root
Current value (from the default) = “//third_party/jsoncpp/source/include”
From //third_party/webrtc/webrtc.gni:54
Used to specify an external Jsoncpp include path when not compiling the
library that comes with WebRTC (i.e. rtc_build_json == 0).
rtc_libvpx_build_vp9
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:174
rtc_link_task_queue_impl
Current value = false
From //.gn:60
Overridden from the default = true
From //third_party/webrtc/webrtc.gni:111
Links a default implementation of task queues to targets
that depend on the target rtc_task_queue. Set to false to
use an external implementation.
rtc_opus_support_120ms_ptime
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:47
Enable this if the Opus version upon which WebRTC is built supports direct
encoding of 120 ms packets.
rtc_opus_variable_complexity
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:50
Enable this to let the Opus audio codec change complexity on the fly.
rtc_prefer_fixed_point
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:61
Selects fixed-point code where possible.
rtc_sanitize_coverage
Current value (from the default) = “”
From //third_party/webrtc/webrtc.gni:106
Set to “func”, “block”, “edge” for coverage generation.
At unit test runtime set UBSAN_OPTIONS=”coverage=1″.
It is recommend to set include_examples=0.
Use llvm’s sancov -html-report for human readable reports.
See http://clang.llvm.org/docs/SanitizerCoverage.html .
rtc_ssl_root
Current value (from the default) = “”
From //third_party/webrtc/webrtc.gni:58
Used to specify an external OpenSSL include path when not compiling the
library that comes with WebRTC (i.e. rtc_build_ssl == 0).
rtc_use_builtin_sw_codecs
Current value (from the default) = true
From //third_party/webrtc/webrtc.gni:153
Disable this to build without support for built-in software codecs.
rtc_use_dummy_audio_file_devices
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:133
By default, use normal platform audio support or dummy audio, but don’t
use file-based audio playout and record.
rtc_use_gtk
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:192
Build sources requiring GTK. NOTICE: This is not present in Chrome OS
build environments, even if available for Chromium builds.
rtc_use_h264
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:129
Enable this to build OpenH264 encoder/FFmpeg decoder. This is supported on
all platforms except Android and iOS. Because FFmpeg can be built
with/without H.264 support, |ffmpeg_branding| has to separately be set to a
value that includes H.264, for example “Chrome”. If FFmpeg is built without
H.264, compilation succeeds but |H264DecoderImpl| fails to initialize. See
also: |rtc_initialize_ffmpeg|.
CHECK THE OPENH264, FFMPEG AND H.264 LICENSES/PATENTS BEFORE BUILDING.
http://www.openh264.org, https://www.ffmpeg.org/
rtc_use_lto
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:99
Link-Time Optimizations.
Executes code generation at link-time instead of compile-time.
https://gcc.gnu.org/wiki/LinkTimeOptimization
rtc_use_memcheck
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:143
When set to true, test targets will declare the files needed to run memcheck
as data dependencies. This is to enable memcheck execution on swarming bots.
rtc_use_x11
Current value (from the default) = false
From //third_party/webrtc/webrtc.gni:84
Set this to false to skip building code that requires X11.
runtime_call_stats_count_everything
Current value (from the default) = false
From //third_party/blink/renderer/platform/BUILD.gn:223
safe_browsing_mode
Current value (from the default) = 1
From //build/config/features.gni:40
sample_profile_is_accurate
Current value (from the default) = false
From //build/config/compiler/compiler.gni:90
Whether we should consider the profile we’re using to be accurate. Accurate
profiles have the benefit of (potentially substantial) binary size
reductions, by instructing the compiler to optimize cold and uncovered
functions heavily for size. This often comes at the cost of performance.
sanitizer_coverage_flags
Current value (from the default) = “”
From //build/config/sanitizers/sanitizers.gni:99
Value for -fsanitize-coverage flag. Setting this causes
use_sanitizer_coverage to be enabled.
Default value when unset and use_fuzzing_engine=true:
trace-pc-guard
Default value when unset and use_sanitizer_coverage=true:
trace-pc-guard,indirect-calls
sanitizer_keep_symbols
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:105
Keep symbol level when building with sanitizers. When sanitizers are
enabled, the default is to compile with the minimum debug info level
necessary, overriding any other symbol level arguments that may be set.
Setting this to true prevents this.
sanitizer_no_symbols
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:109
Builds fuzzer/sanitizers without symbols. Use with symbol_level=0.
Useful for reducing binary size when building with use_clang_coverage=true.
single_module_mode_handle_verifier
Current value (from the default) = false
From //base/win/BUILD.gn:10
Indicates if the handle verifier should operate in a single module mode. By
default a single instance gets shared by all the modules.
skia_whitelist_serialized_typefaces
Current value (from the default) = false
From //skia/BUILD.gn:25
skip_archive_compression
Current value (from the default) = true
From //chrome/installer/mini_installer/BUILD.gn:20
The Chrome archive is compressed in official builds to reduce the size of
the installer. By default: non-official or component builds, a build mode
targeting developers, do not compress so as to provide quicker build-test
cycles.
strip_absolute_paths_from_debug_symbols
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:102
Optimize symbol files for maximizing goma cache hit rate. This is on by
default only when goma is enabled on Linux because setting this to true may
make it harder to debug binaries.
See below reference for detail.
https://chromium.googlesource.com/chromium/src/+/master/docs/linux_debugging.md#Source-level-debug-with-fdebug-prefix-map
strip_debug_info
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:108
Strip the debug info of symbols file in lib.unstripped to reduce size.
symbol_level
Current value = 2
From //out/my_x86_d/args.gn:21
Overridden from the default = -1
From //build/config/compiler/compiler.gni:26
How many symbols to include in the build. This affects the performance of
the build since the symbols are large and dealing with them is slow.
2 means regular build with symbols.
1 means minimal symbols, usually enough for backtraces only. Symbols with
internal linkage (static functions or those in anonymous namespaces) may not
appear when using this level.
0 means no symbols.
-1 means auto-set according to debug/release and platform.
system_libdir
Current value (from the default) = “lib”
From //build/config/linux/pkg_config.gni:47
CrOS systemroots place pkgconfig files at <systemroot>/usr/share/pkgconfig
and one of <systemroot>/usr/lib/pkgconfig or <systemroot>/usr/lib64/pkgconfig
depending on whether the systemroot is for a 32 or 64 bit architecture.
When build under GYP, CrOS board builds specify the ‘system_libdir’ variable
as part of the GYP_DEFINES provided by the CrOS emerge build or simple
chrome build scheme. This variable permits controlling this for GN builds
in similar fashion by setting the `system_libdir` variable in the build’s
args.gn file to ‘lib’ or ‘lib64’ as appropriate for the target architecture.
target_cpu
Current value = “x86”
From //out/my_x86_d/args.gn:14
Overridden from the default = “”
(Internally set; try `gn help target_cpu`.)
target_os
Current value = “win”
From //out/my_x86_d/args.gn:13
Overridden from the default = “”
(Internally set; try `gn help target_os`.)
target_sysroot
Current value (from the default) = “”
From //build/config/sysroot.gni:13
The absolute path of the sysroot that is applied when compiling using
the target toolchain.
target_sysroot_dir
Current value (from the default) = “//build/linux”
From //build/config/sysroot.gni:16
The absolute path to directory containing linux sysroot images
target_winuwp_family
Current value (from the default) = “app”
From //build/config/win/BUILD.gn:38
possible values:
“app” – Windows Store Applications
“phone” – Windows Phone Applications
“system” – Windows Drivers and Tools
“server” – Windows Server Applications
“desktop” – Windows Desktop Applications
target_winuwp_version
Current value (from the default) = “10”
From //build/config/win/BUILD.gn:30
possible values for target_winuwp_version:
“10” – Windows UWP 10
“8.1” – Windows RT 8.1
“8.0” – Windows RT 8.0
toolkit_views
Current value (from the default) = true
From //build/config/ui.gni:38
True means the UI is built using the “views” framework.
treat_warnings_as_errors
Current value (from the default) = true
From //build/config/compiler/BUILD.gn:43
Default to warnings as errors for default workflow, where we catch
warnings with known toolchains. Allow overriding this e.g. for Chromium
builds on Linux that could use a different version of the compiler.
With GCC, warnings in no-Chromium code are always not treated as errors.
use_afl
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:79
Compile for fuzzing with AFL.
use_allocator
Current value (from the default) = “none”
From //build/config/allocator.gni:28
Memory allocator to use. Set to “none” to use default allocator.
use_allocator_shim
Current value (from the default) = false
From //build/config/allocator.gni:31
Causes all the allocations to be routed via allocator_shim.cc.
use_alsa
Current value (from the default) = false
From //media/media_options.gni:96
Enables runtime selection of ALSA library for audio.
use_aura
Current value (from the default) = true
From //build/config/ui.gni:30
Indicates if Aura is enabled. Aura is a low-level windowing library, sort
of a replacement for GDI or GTK.
use_cfi_cast
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:59
Enable checks for bad casts: derived cast and unrelated cast.
TODO(krasin): remove this, when we’re ready to add these checks by default.
https://crbug.com/626794
use_cfi_diag
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:68
Print detailed diagnostics when Control Flow Integrity detects a violation.
use_cfi_icall
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:64
Enable checks for indirect function calls via a function pointer.
TODO(pcc): remove this when we’re ready to add these checks by default.
https://crbug.com/701919
use_cfi_recover
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:72
Let Control Flow Integrity continue execution instead of crashing when
printing diagnostics (use_cfi_diag = true).
use_clang_coverage
Current value (from the default) = false
From //build/config/coverage/coverage.gni:9
Enable Clang’s Source-based Code Coverage.
use_clang_static_analyzer
Current value (from the default) = false
From //build/toolchain/clang_static_analyzer.gni:10
Uses the Clang static analysis tools during compilation.
use_coverage
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:57
Enable coverage information
use_cras
Current value (from the default) = false
From //media/media_options.gni:51
Override to dynamically link the cras (ChromeOS audio) library.
use_crash_key_stubs
Current value (from the default) = false
From //components/crash/core/common/BUILD.gn:9
If set to true, this will stub out and disable the entire crash key system.
use_cups
Current value (from the default) = false
From //printing/buildflags/buildflags.gni:18
use_custom_libcxx
Current value (from the default) = false
From //build/config/c++/c++.gni:14
use_custom_libcxx_for_host
Current value (from the default) = false
From //build/config/c++/c++.gni:24
Use libc++ instead of stdlibc++ when using the host_cpu toolchain, even if
use_custom_libcxx is false. This is useful for cross-compiles where a custom
toolchain for the target_cpu has been set as the default toolchain, but
use_custom_libcxx should still be true when building for the host. The
expected usage is to set use_custom_libcxx=false and
use_custom_libcxx_for_host=true in the passed in buildargs.
use_cxx11
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:105
Allow projects that wish to stay on C++11 to override Chromium’s default.
use_cxx11_on_android
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:138
C++11 may not be an option if Android test infrastructure is used.
use_dbus
Current value (from the default) = false
From //build/config/features.gni:51
use_debug_fission
Current value (from the default) = “default”
From //build/config/compiler/compiler.gni:42
use_debug_fission: whether to use split DWARF debug info
files. This can reduce link time significantly, but is incompatible
with some utilities such as icecc and ccache. Requires gold and
gcc >= 4.8 or clang.
http://gcc.gnu.org/wiki/DebugFission
This is a placeholder value indicating that the code below should set
the default. This is necessary to delay the evaluation of the default
value expression until after its input values such as use_gold have
been set, e.g. by a toolchain_args() block.
use_drfuzz
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:87
Compile for fuzzing with Dr. Fuzz
See http://www.chromium.org/developers/testing/dr-fuzz
use_egl
Current value (from the default) = true
From //ui/gl/features.gni:12
Should EGL support be compiled. Can be overriden to test during bring up
of EGL support on other platforms
use_evdev_gestures
Current value (from the default) = false
From //ui/events/ozone/BUILD.gn:12
Support ChromeOS touchpad gestures with ozone.
use_external_popup_menu
Current value (from the default) = false
From //content/common/features.gni:9
Whether or not to use external popup menu.
use_gcm_from_platform
Current value (from the default) = false
From //components/gcm_driver/config.gni:8
Use native GCM driver for all non-Android builds. On Android, the platform
includes GMS which provides the GCM client.
use_ghash
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:133
Turn this on to use ghash feature of lld for faster debug link on Windows.
http://blog.llvm.org/2018/01/improving-link-time-on-windows-with.html
use_gio
Current value (from the default) = false
From //build/config/features.gni:53
use_glib
Current value (from the default) = false
From //build/config/ui.gni:33
Whether we should use glib, a low level C utility library.
use_gnome_keyring
Current value (from the default) = false
From //components/os_crypt/features.gni:10
Whether to use libgnome-keyring (deprecated by libsecret).
See http://crbug.com/466975 and http://crbug.com/355223.
use_gold
Current value (from the default) = false
From //build/config/compiler/compiler.gni:175
Whether to use the gold linker from binutils instead of lld or bfd.
use_goma
Current value = false
From //out/my_x86_d/args.gn:20
Overridden from the default = false
From //build/toolchain/goma.gni:9
Set to true to enable distributed compilation using Goma.
use_gtk3
Current value (from the default) = true
From //build/config/linux/gtk/gtk.gni:11
Whether to compile against GTKv3 instead of GTKv2.
use_icf
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:154
Set to true to use icf, Identical Code Folding.
icf=all is broken in older golds, see
https://sourceware.org/bugzilla/show_bug.cgi?id=17704
See also https://crbug.com/663886
`linux_use_bundled_binutils` is to avoid breaking Linux distros which may
still have a buggy gold.
chromeos binutils has been patched with the fix, so always use icf there.
The bug only affects x86 and x64, so we can still use ICF when targeting
other architectures.
lld doesn’t have the bug.
use_incremental_wpo
Current value (from the default) = false
From //build/config/compiler/compiler.gni:55
Whether or not we should turn on incremental WPO. Only affects the VS
Windows build.
use_jumbo_build
Current value (from the default) = false
From //build/config/jumbo.gni:11
If true, use a jumbo build (files compiled together) to speed up
compilation.
use_kerberos
Current value (from the default) = true
From //net/features.gni:24
Enable Kerberos authentication. It is disabled by default on iOS, Fuchsia
and Chromecast, at least for now. This feature needs configuration
(krb5.conf and so on). On Chrome OS it is only supported on Active
Directory managed devices.
TODO(fuchsia): Enable kerberos on Fuchsia when it’s implemented there.
use_libfuzzer
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:76
Compile for fuzzing with LLVM LibFuzzer.
See http://www.chromium.org/developers/testing/libfuzzer
use_libjpeg_turbo
Current value (from the default) = true
From //third_party/libjpeg.gni:11
Uses libjpeg_turbo as the jpeg implementation. Has no effect if
use_system_libjpeg is set.
use_libpci
Current value (from the default) = false
From //third_party/angle/BUILD.gn:18
Use the PCI lib to collect GPU information on Linux.
use_lld
Current value (from the default) = true
From //build/config/compiler/compiler.gni:166
use_locally_built_instrumented_libraries
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:47
Use dynamic libraries instrumented by one of the sanitizers instead of the
standard system libraries. Set this flag to build the libraries from source.
use_low_quality_image_interpolation
Current value (from the default) = false
From //third_party/blink/renderer/config.gni:35
If true, defaults image interpolation to low quality.
use_official_google_api_keys
Current value (from the default) = “”
From //google_apis/BUILD.gn:31
You can set the variable ‘use_official_google_api_keys’ to true
to use the Google-internal file containing official API keys
for Google Chrome even in a developer build. Setting this
variable explicitly to true will cause your build to fail if the
internal file is missing.
The variable is documented here, but not handled in this file;
see //google_apis/determine_use_official_keys.gypi for the
implementation.
Set the variable to false to not use the internal file, even when
it exists in your checkout.
Leave it unset or set to “” to have the variable
implicitly set to true if you have
src/google_apis/internal/google_chrome_api_keys.h in your
checkout, and implicitly set to false if not.
Note that official builds always behave as if the variable
was explicitly set to true, i.e. they always use official keys,
and will fail to build if the internal file is missing.
use_openh264
Current value (from the default) = false
From //third_party/openh264/openh264_args.gni:11
Enable this to build OpenH264 (for encoding, not decoding).
CHECK THE OPENH264 LICENSE/PATENT BEFORE BUILDING, see
http://www.openh264.org/.
use_ozone
Current value (from the default) = false
From //build/config/ui.gni:26
Indicates if Ozone is enabled. Ozone is a low-level library layer for Linux
that does not require X11. Enabling this feature disables use of glib, x11,
Pango, and Cairo.
use_partition_alloc
Current value (from the default) = true
From //build/config/allocator.gni:34
Partition alloc is included by default except iOS.
use_pic
Current value (from the default) = true
From //build/config/compiler/compiler.gni:58
Whether or not we should use position independent code.
use_platform_icu_alternatives
Current value (from the default) = false
From //url/features.gni:10
Enables the use of ICU alternatives in lieu of ICU for the target toolchain.
The flag is used for Cronet to reduce the size of the Cronet binary.
use_prebuilt_instrumented_libraries
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:43
Use dynamic libraries instrumented by one of the sanitizers instead of the
standard system libraries. Set this flag to download prebuilt binaries from
GCS.
use_pulseaudio
Current value (from the default) = false
From //media/media_options.gni:93
Enables runtime selection of PulseAudio library.
use_rtti
Current value (from the default) = false
From //build/config/compiler/BUILD.gn:85
Build with C++ RTTI enabled. Chromium builds without RTTI by default,
but some sanitizers are known to require it, like CFI diagnostics
and UBsan variants.
use_sanitizer_coverage
Current value (from the default) = false
From //build/config/sanitizers/sanitizers.gni:145
use_static_angle
Current value (from the default) = false
From //ui/gl/features.gni:8
Whether ANGLE should be linked statically
False by default, enabling currently supported only on Android
use_swiftshader_with_subzero
Current value (from the default) = true
From //third_party/swiftshader/src/Reactor/BUILD.gn:20
Currently, Subzero is not used by default
LLVM is still the default backend
use_sysroot
Current value (from the default) = true
From //build/config/sysroot.gni:18
use_system_freetype
Current value (from the default) = false
From //build/config/freetype/freetype.gni:13
Blink needs a recent and properly build-configured FreeType version to
support OpenType variations, color emoji and avoid security bugs. By default
we ship and link such a version as part of Chrome. For distributions that
prefer to keep linking to the version the system, FreeType must be newer
than version 2.7.1 and have color bitmap support compiled in. WARNING:
System FreeType configurations other than as described WILL INTRODUCE TEXT
RENDERING AND SECURITY REGRESSIONS.
use_system_harfbuzz
Current value (from the default) = false
From //third_party/harfbuzz-ng/harfbuzz.gni:11
Blink uses a cutting-edge version of Harfbuzz; most Linux distros do not
contain a new enough version of the code to work correctly. However,
ChromeOS chroots (i.e, real ChromeOS builds for devices) do contain a
new enough version of the library, and so this variable exists so that
ChromeOS can build against the system lib and keep binary sizes smaller.
use_system_lcms2
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:63
Don’t build against bundled lcms2.
use_system_libjpeg
Current value (from the default) = false
From //third_party/libjpeg.gni:7
Uses system libjpeg. If true, overrides use_libjpeg_turbo.
use_system_libpng
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:66
Don’t build against bundled libpng.
use_system_xcode
Current value (from the default) = “”
From //build_overrides/build.gni:48
Use the system install of Xcode for tools like ibtool, libtool, etc.
This does not affect the compiler. When this variable is false, targets will
instead use a hermetic install of Xcode. [The hermetic install can be
obtained with gclient sync after setting the environment variable
FORCE_MAC_TOOLCHAIN].
use_system_zlib
Current value (from the default) = false
From //third_party/pdfium/pdfium.gni:60
Don’t build against bundled zlib.
use_thin_lto
Current value (from the default) = false
From //build/config/compiler/compiler.gni:46
Enables support for ThinLTO, which links 3x-10x faster than full LTO. See
also http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html
use_udev
Current value (from the default) = false
From //build/config/features.gni:49
libudev usage. This currently only affects the content layer.
use_unofficial_version_number
Current value (from the default) = true
From //components/version_info/BUILD.gn:10
use_v4l2_codec
Current value (from the default) = false
From //media/gpu/args.gni:11
Indicates if Video4Linux2 codec is used. This is used for all CrOS
platforms which have v4l2 hardware encoder / decoder.
use_v4lplugin
Current value (from the default) = false
From //media/gpu/args.gni:7
Indicates if V4L plugin is used.
use_v8_context_snapshot
Current value (from the default) = true
From //tools/v8_context_snapshot/v8_context_snapshot.gni:18
use_vaapi
Current value (from the default) = false
From //media/gpu/args.gni:15
Indicates if VA-API-based hardware acceleration is to be used. This
is typically the case on x86-based ChromeOS devices.
use_vr_assets_component
Current value (from the default) = false
From //chrome/browser/vr/features.gni:12
Whether to register, download, etc. the VR assets component.
use_vs_code_analysis
Current value (from the default) = false
From //build/config/win/BUILD.gn:21
Set this to true to enable static analysis through Visual Studio’s
/analyze. This dramatically slows compiles and reports thousands of
warnings, so normally this is done on a build machine and only the new
warnings are examined.
use_webaudio_ffmpeg
Current value (from the default) = true
From //third_party/blink/renderer/config.gni:38
If true, ffmpeg will be used for decoding audio.
use_xcode_clang
Current value (from the default) = false
From //build/toolchain/toolchain.gni:23
Compile with Xcode version of clang instead of hermetic version shipped
with the build. Used on iOS to ship official builds (as they are built
with the version of clang shipped with Xcode).
use_xkbcommon
Current value (from the default) = false
From //ui/base/ui_features.gni:9
Optional system library.
use_zucchini
Current value (from the default) = false
From //chrome/installer/setup/buildflags.gni:8
Specify if the Zucchini patcher features should be included in setup.exe.
See //components/zucchini for more information.
using_mismatched_sample_profile
Current value (from the default) = false
From //build/config/compiler/compiler.gni:65
Whether we’re using a sample profile collected on an architecture different
than the one we’re compiling for.
It’s currently not possible to collect AFDO profiles on anything but
x86{,_64}.
v8_android_log_stdout
Current value (from the default) = false
From //v8/BUILD.gn:23
Print to stdout on Android.
v8_can_use_fpu_instructions
Current value (from the default) = true
From //v8/BUILD.gn:120
Similar to vfp but on MIPS.
v8_check_microtasks_scopes_consistency
Current value = false
From //.gn:57
Overridden from the default = “”
From //v8/BUILD.gn:146
Temporary flag to allow embedders to update their microtasks scopes
while rolling in a new version of V8.
v8_code_coverage
Current value (from the default) = false
From //v8/gni/v8.gni:13
Set flags for tracking code coverage. Uses gcov with gcc and sanitizer
coverage with clang.
v8_correctness_fuzzer
Current value (from the default) = false
From //v8/gni/v8.gni:16
Includes files needed for correctness fuzzing.
v8_current_cpu
Current value (from the default) = “x86”
From //build/config/v8_target_cpu.gni:60
This argument is declared here so that it can be overridden in toolchains.
It should never be explicitly set by the user.
v8_deprecation_warnings
Current value (from the default) = false
From //v8/BUILD.gn:39
Enable compiler warnings when using V8_DEPRECATED apis.
v8_embed_script
Current value (from the default) = “”
From //v8/BUILD.gn:45
Embeds the given script into the snapshot.
v8_embedder_string
Current value (from the default) = “”
From //v8/BUILD.gn:48
Allows the embedder to add a custom suffix to the version string.
v8_enable_backtrace
Current value (from the default) = “”
From //v8/gni/v8.gni:32
Support for backtrace_symbols on linux.
v8_enable_concurrent_marking
Current value (from the default) = true
From //v8/BUILD.gn:99
Sets -dV8_CONCURRENT_MARKING
v8_enable_debugging_features
Current value (from the default) = true
From //v8/BUILD.gn:27
Turns on all V8 debug features. Enables running V8 in a pseudo debug mode
within a release Chrome.
v8_enable_disassembler
Current value (from the default) = “”
From //v8/BUILD.gn:51
Sets -dENABLE_DISASSEMBLER.
v8_enable_embedded_builtins
Current value (from the default) = false
From //v8/BUILD.gn:74
Enable embedded builtins.
TODO(jgruber,v8:6666): Support ia32 and maybe MSVC.
TODO(jgruber,v8:6666): Re-enable.
v8_enable_fast_mksnapshot
Current value (from the default) = false
From //v8/BUILD.gn:69
Enable fast mksnapshot runs.
v8_enable_future
Current value (from the default) = false
From //v8/BUILD.gn:30
Sets -DV8_ENABLE_FUTURE.
v8_enable_gdbjit
Current value = false
From //.gn:52
Overridden from the default = false
From //v8/BUILD.gn:141
v8_enable_handle_zapping
Current value (from the default) = true
From //v8/BUILD.gn:63
Sets -dENABLE_HANDLE_ZAPPING.
v8_enable_i18n_support
Current value (from the default) = true
From //v8/gni/v8.gni:49
Enable ECMAScript Internationalization API. Enabling this feature will
add a dependency on the ICU library.
v8_enable_minor_mc
Current value (from the default) = true
From //v8/BUILD.gn:152
Enable minor mark compact.
v8_enable_object_print
Current value (from the default) = “”
From //v8/BUILD.gn:84
Sets -dOBJECT_PRINT.
v8_enable_slow_dchecks
Current value (from the default) = false
From //v8/BUILD.gn:66
Enable slow dchecks.
v8_enable_test_features
Current value (from the default) = “”
From //v8/BUILD.gn:102
Enables various testing features.
v8_enable_trace_feedback_updates
Current value (from the default) = false
From //v8/BUILD.gn:96
Sets -dV8_TRACE_FEEDBACK_UPDATES.
v8_enable_trace_ignition
Current value (from the default) = false
From //v8/BUILD.gn:93
Sets -dV8_TRACE_IGNITION.
v8_enable_trace_maps
Current value (from the default) = “”
From //v8/BUILD.gn:87
Sets -dV8_TRACE_MAPS.
v8_enable_v8_checks
Current value (from the default) = “”
From //v8/BUILD.gn:90
Sets -dV8_ENABLE_CHECKS.
v8_enable_verify_csa
Current value (from the default) = false
From //v8/BUILD.gn:77
Enable code-generation-time checking of types in the CodeStubAssembler.
v8_enable_verify_heap
Current value (from the default) = “”
From //v8/BUILD.gn:33
Sets -DVERIFY_HEAP.
v8_enable_verify_predictable
Current value (from the default) = false
From //v8/BUILD.gn:36
Sets -DVERIFY_PREDICTABLE
v8_enable_vtunejit
Current value (from the default) = false
From //v8/BUILD.gn:60
Sets -dENABLE_VTUNE_JIT_INTERFACE.
v8_experimental_extra_library_files
Current value = []
From //.gn:51
Overridden from the default = [“//test/cctest/test-experimental-extra.js”]
From //v8/BUILD.gn:138
v8_extra_library_files
Current value = [“//third_party/blink/renderer/core/streams/CommonOperations.js”, “//third_party/blink/renderer/core/streams/CommonStrings.js”, “//third_party/blink/renderer/core/streams/SimpleQueue.js”, “//third_party/blink/renderer/core/streams/ByteLengthQueuingStrategy.js”, “//third_party/blink/renderer/core/streams/CountQueuingStrategy.js”, “//third_party/blink/renderer/core/streams/ReadableStream.js”, “//third_party/blink/renderer/core/streams/WritableStream.js”, “//third_party/blink/renderer/core/streams/TransformStream.js”]
From //.gn:37
Overridden from the default = [“//test/cctest/test-extra.js”]
From //v8/BUILD.gn:132
List of extra files to snapshot. They will be snapshotted in order so
if files export symbols used by later files, they should go first.
This default is used by cctests. Projects using V8 will want to override.
v8_gcmole
Current value (from the default) = false
From //v8/gni/v8.gni:26
Indicate if gcmole was fetched as a hook to make it available on swarming.
v8_has_valgrind
Current value (from the default) = false
From //v8/gni/v8.gni:23
Indicate if valgrind was fetched as a custom deps to make it available on
swarming.
v8_imminent_deprecation_warnings
Current value = false
From //.gn:53
Overridden from the default = false
From //v8/BUILD.gn:42
Enable compiler warnings when using V8_DEPRECATE_SOON apis.
v8_interpreted_regexp
Current value (from the default) = false
From //v8/BUILD.gn:81
Interpreted regexp engine exists as platform-independent alternative
based where the regular expression is compiled to a bytecode.
v8_monolithic
Current value (from the default) = false
From //v8/gni/v8.gni:55
Enable monolithic static library for embedders.
v8_multi_arch_build
Current value (from the default) = false
From //v8/gni/v8.gni:19
Adds additional compile target for building multiple architectures at once.
v8_no_inline
Current value (from the default) = false
From //v8/BUILD.gn:114
Switches off inlining in V8.
v8_optimized_debug
Current value (from the default) = true
From //v8/gni/v8.gni:29
Turns on compiler optimizations in V8 in Debug build.
v8_os_page_size
Current value (from the default) = “0”
From //v8/BUILD.gn:117
Override OS page size when generating snapshot
v8_perf_prof_unwinding_info
Current value (from the default) = false
From //v8/BUILD.gn:106
Build the snapshot with unwinding information for perf.
Sets -dV8_USE_SNAPSHOT_WITH_UNWINDING_INFO.
v8_postmortem_support
Current value (from the default) = false
From //v8/BUILD.gn:111
With post mortem support enabled, metadata is embedded into libv8 that
describes various parameters of the VM for use by debuggers. See
tools/gen-postmortem-metadata.py for details.
v8_promise_internal_field_count
Current value (from the default) = 0
From //v8/BUILD.gn:54
Sets the number of internal fields on promise objects.
v8_snapshot_toolchain
Current value (from the default) = “”
From //v8/snapshot_toolchain.gni:34
The v8 snapshot needs to be built by code that is compiled with a
toolchain that matches the bit-width of the target CPU, but runs on
the host.
v8_static_library
Current value (from the default) = false
From //v8/gni/v8.gni:52
Use static libraries instead of source_sets.
v8_target_cpu
Current value (from the default) = “”
From //build/config/v8_target_cpu.gni:33
This arg is used when we want to tell the JIT-generating v8 code
that we want to have it generate for an architecture that is different
than the architecture that v8 will actually run on; we then run the
code under an emulator. For example, we might run v8 on x86, but
generate arm code and run that under emulation.
This arg is defined here rather than in the v8 project because we want
some of the common architecture-specific args (like arm_float_abi or
mips_arch_variant) to be set to their defaults either if the current_cpu
applies *or* if the v8_current_cpu applies.
As described below, you can also specify the v8_target_cpu to use
indirectly by specifying a `custom_toolchain` that contains v8_$cpu in the
name after the normal toolchain.
For example, `gn gen –args=”custom_toolchain=…:clang_x64_v8_arm64″`
is equivalent to setting –args=`v8_target_cpu=”arm64″`. Setting
`custom_toolchain` is more verbose but makes the toolchain that is
(effectively) being used explicit.
v8_target_cpu can only be used to target one architecture in a build,
so if you wish to build multiple copies of v8 that are targeting
different architectures, you will need to do something more
complicated involving multiple toolchains along the lines of
custom_toolchain, above.
v8_typed_array_max_size_in_heap
Current value (from the default) = 64
From //v8/BUILD.gn:126
Controls the threshold for on-heap/off-heap Typed Arrays.
v8_untrusted_code_mitigations
Current value (from the default) = true
From //v8/BUILD.gn:149
Enable mitigations for executing untrusted code.
v8_use_external_startup_data
Current value (from the default) = “”
From //v8/gni/v8.gni:45
Use external files for startup data blobs:
the JS builtins sources and the start snapshot.
v8_use_mips_abi_hardfloat
Current value (from the default) = true
From //v8/BUILD.gn:123
Similar to the ARM hard float ABI but on MIPS.
v8_use_multi_snapshots
Current value (from the default) = “”
From //v8/gni/v8.gni:41
Enable several snapshots side-by-side (e.g. default and for trusted code).
v8_use_snapshot
Current value (from the default) = true
From //v8/gni/v8.gni:38
Enable the snapshot feature, for fast context creation.
http://v8project.blogspot.com/2015/09/custom-startup-snapshots.html
TODO(thakis): Make snapshots work in 64-bit win/cross builds,
https://803591
visual_studio_path
Current value (from the default) = “”
From //build/config/win/visual_studio_version.gni:9
Path to Visual Studio. If empty, the default is used which is to use the
automatic toolchain in depot_tools. If set, you must also set the
visual_studio_version and wdk_path.
visual_studio_version
Current value (from the default) = “”
From //build/config/win/visual_studio_version.gni:13
Version of Visual Studio pointed to by the visual_studio_path.
Currently always “2015”.
wdk_path
Current value (from the default) = “”
From //build/config/win/visual_studio_version.gni:17
Directory of the Windows driver kit. If visual_studio_path is empty, this
will be auto-filled.
win_console_app
Current value (from the default) = false
From //build/config/win/console_app.gni:12
If true, builds as a console app (rather than a windowed app), which allows
logging to be printed to the user. This will cause a terminal window to pop
up when the executable is not run from the command line, so should only be
used for development. Only has an effect on Windows builds.
win_linker_timing
Current value (from the default) = false
From //build/config/win/BUILD.gn:24
Turn this on to have the linker output extra timing information.
windows_sdk_path
Current value (from the default) = “C:\Program Files (x86)\Windows Kits\10”
From //build/config/win/visual_studio_version.gni:22
Full path to the Windows SDK, not including a backslash at the end.
This value is the default location, override if you have a different
installation location.
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