is2120

webrtc windows 参数说明

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 //modules/audio_processing/BUILD.gn:18

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.

android_full_debug

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:50

Normally, Android builds are lightly optimized, even for debug builds, to

keep binary size down. Setting this flag to true disables such optimization

apm_debug_dump

Current value (from the default) = false

From //webrtc.gni:97

Selects whether debug dumps for the audio processing module

should be generated.

archive_seed_corpus

Current value (from the default) = true

From //build/config/sanitizers/sanitizers.gni:118

When true, seed corpora archives are built.

asan_globals

Current value (from the default) = true

From //build/config/sanitizers/sanitizers.gni:161

Detect overflow/underflow for global objects.

Mac: http://crbug.com/352073

asan_use_blacklist

Current value (from the default) = true

From //build/config/sanitizers/sanitizers.gni:110

Use blacklists from tools/memory/asan when compiling with asan.

auto_profile_path

Current value (from the default) = ""

From //build/config/compiler/BUILD.gn:94

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:59

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_with_mozilla

Current value (from the default) = false

From //webrtc.gni:121

Enable to use the Mozilla internal settings.

cast_is_debug

Current value (from the default) = true

From //build/config/chromecast_build.gni:16

If true, IS_CAST_DEBUG_BUILD() will evaluate to 1 in version.h. Otherwise,

it will evaluate to 0. Overriding this when is_debug=false is useful for

doing engineering builds.

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.

chromecast_branding

Current value (from the default) = "public"

From //build/config/chromecast_build.gni:20

chromecast_branding is used to include or exclude Google-branded components.

Set it to "public" for a Chromium build.

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:101

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:109

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) = "9.0.0"

From //build/toolchain/toolchain.gni:45

Clang compiler version. Clang files are placed at version-dependent paths.

compiler_timing

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:113

Turn this on to have the compiler output extra timing information.

compute_build_timestamp

Current value (from the default) = "compute_build_timestamp.py"

From //build/timestamp.gni:17

This should be the filename of a script that prints a single line

containing an integer that's a unix timestamp in UTC.

This timestamp is used as build time and will be compiled into

other code.

This argument may look unused. Before removing please check with the

chromecast team to see if they still use it internally.

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.

coverage_instrumentation_input_file

Current value (from the default) = ""

From //build/config/coverage/coverage.gni:22

The path to the coverage instrumentation input file should be a source root

absolute path (e.g. //out/Release/coverage_instrumentation_input.txt), and

the file consists of multiple lines where each line represents a path to a

source file, and the paths must be relative to the root build directory.

e.g. ../../base/task/post_task.cc for build directory 'out/Release'.

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 (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.

disable_libfuzzer

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:93

Helper variable for testing builds with disabled libfuzzer.

Not for client use.

enable_cast_renderer

Current value (from the default) = false

From //build/config/chromecast_build.gni:47

enable_full_stack_frames_for_profiling

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:67

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_iterator_debugging

Current value (from the default) = false

From //build/config/BUILD.gn:37

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 - two orders of magnitude slowdown has been

seen (crbug.com/903553) and iterator debugging also slows builds by making

generation of snapshot_blob.bin take ~40-60 s longer. Therefore this

defaults to off.

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_profiling

Current value (from the default) = false

From //build/config/compiler/compiler.gni:44

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.

fatal_linker_warnings

Current value (from the default) = true

From //build/config/compiler/BUILD.gn:83

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

force_local_build_id

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:135

By default only the binaries in official builds get build IDs.

full_wpo_on_official

Current value (from the default) = false

From //build/config/compiler/compiler.gni:172

generate_linker_map

Current value (from the default) = false

From //build/toolchain/toolchain.gni:26

Used for binary size analysis.

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:71

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:19

Absolute directory containing the gomacc.exe binary.

gtest_enable_absl_printers

Current value = true

From //.gn:82

Overridden from the default = false

From //third_party/googletest/BUILD.gn:9

If true, it assumes that //third_party/abseil-cpp is an available dependency.

has_gomacc_path

Current value (from the default) = false

From //build/toolchain/goma.gni:14

This flag is for ChromeOS compiler wrapper.

By passing gomacc path via GOMACC_PATH environment variable, ChromeOS'

compiler wrapper invokes gomacc inside it.

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.

ios_deployment_target

Current value = "10.0"

From //.gn:66

Overridden from the default = "11.0"

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:12

Compile for Address Sanitizer to find memory bugs.

is_cast_audio_only

Current value (from the default) = false

From //build/config/chromecast_build.gni:23

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:39

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 //build/config/chromecast_build.gni:27

If true, use cast CMA backend instead of default chromium media pipeline.

TODO(sanfin): Remove this flag when all builds enable CMA.

is_cfi

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:59

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 = false

From //.gn:62

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_debug

Current value = true

From //out/Default/args.gn:1

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_hwasan

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:17

Compile for Hardware-Assisted Address Sanitizer to find memory bugs

(android/arm64 only).

See http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html

is_lsan

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:20

Compile for Leak Sanitizer to find leaks.

is_msan

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:23

Compile for Memory Sanitizer to find uninitialized reads.

is_multi_dll_chrome

Current value (from the default) = true

From //build/config/chrome_build.gni:13

Break chrome.dll into multple pieces based on process type. Only available

on Windows.

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_tsan

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:26

Compile for Thread Sanitizer to find threading bugs.

is_ubsan

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:30

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:33

Halt the program if a problem is detected.

is_ubsan_null

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:36

Compile for Undefined Behaviour Sanitizer's null pointer checks.

is_ubsan_security

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:89

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:39

Compile for Undefined Behaviour Sanitizer's vptr checks.

is_win_fastlink

Current value (from the default) = false

From //build/config/compiler/compiler.gni:67

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.

libcxx_abi_unstable

Current value (from the default) = true

From //build/config/c++/BUILD.gn:17

lldb pretty printing only works when libc++ is built in the __1 (or __ndk1)

namespaces. For pretty printing to work out-of-the-box on Mac (where lldb

is primarily used), this flag is set to false to build with the __1

namespace (to maintain ABI compatibility, this implies building without

_LIBCPP_ABI_UNSTABLE). This is not necessary on non-component builds

because we leave the ABI version set to __1 in that case because libc++

symbols are not exported.

TODO(thomasanderson): Set this to true by default once rL352899 is available

in MacOS's lldb.

libcxx_is_shared

Current value (from the default) = false

From //build/config/c++/c++.gni:39

WARNING: Setting this to a non-default value is highly discouraged.

If true, libc++ will be built as a shared library; otherwise libc++ will be

linked statically. Setting this to something other than the default is

unsupported and can be broken by libc++ rolls. Note that if this is set to

true, you must also set libcxx_abi_unstable=false, which is bad for

performance and memory use.

libcxx_svn_revision

Current value (from the default) = "358423"

From //buildtools/deps_revisions.gni:8

The libc++ svn revision that belongs to the git hash in DEPS. Used to cause

full rebuilds on libc++ rolls.

libyuv_disable_jpeg

Current value (from the default) = false

From //third_party/libyuv/libyuv.gni:15

libyuv_include_tests

Current value (from the default) = true

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 = false

From //.gn:80

Overridden from the default = true

From //third_party/libyuv/BUILD.gn:14

Set to false to disable building with gflags.

libyuv_use_mmi

Current value (from the default) = false

From //third_party/libyuv/libyuv.gni:22

libyuv_use_msa

Current value (from the default) = false

From //third_party/libyuv/libyuv.gni:20

libyuv_use_neon

Current value (from the default) = false

From //third_party/libyuv/libyuv.gni:17

linux_use_bundled_binutils

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:57

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 = "10.12"

From //.gn:64

Overridden from the default = "10.13"

From //build/config/mac/mac_sdk_overrides.gni:12

mips_use_mmi

Current value (from the default) = false

From //build/config/mips.gni:13

MIPS MultiMedia Instruction compilation flag.

msan_track_origins

Current value (from the default) = 2

From //build/config/sanitizers/sanitizers.gni:44

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/config/win/BUILD.gn:47

Use absolute file paths in the compiler diagnostics and (for non-clang)

__FILE__ macro if needed. Note that enabling this makes your build

dependent your checkout's path, which means you won't get to use goma's

global cache, and without clang your builds won't be deterministic.

msvs_xtree_patched

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:77

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.

optimize_for_fuzzing

Current value (from the default) = false

From //build/config/sanitizers/sanitizers.gni:97

Optimize for coverage guided fuzzing (balance between speed and number of

branches). Can be also used to remove non-determinism and other issues.

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.

ro_segment_workaround_for_valgrind

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:118

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

rtc_audio_device_plays_sinus_tone

Current value (from the default) = false

From //webrtc.gni:168

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 //webrtc.gni:103

Set this to false to skip building examples.

rtc_build_json

Current value (from the default) = true

From //webrtc.gni:215

Disable these to not build components which can be externally provided.

rtc_build_libevent

Current value (from the default) = false

From //webrtc.gni:226

rtc_build_libsrtp

Current value (from the default) = true

From //webrtc.gni:216

rtc_build_libvpx

Current value (from the default) = true

From //webrtc.gni:217

rtc_build_opus

Current value (from the default) = true

From //webrtc.gni:219

rtc_build_ssl

Current value (from the default) = true

From //webrtc.gni:220

rtc_build_tools

Current value (from the default) = true

From //webrtc.gni:106

Set this to false to skip building tools.

rtc_build_usrsctp

Current value (from the default) = true

From //webrtc.gni:221

rtc_build_with_neon

Current value (from the default) = false

From //webrtc.gni:145

rtc_builtin_ssl_root_certificates

Current value (from the default) = true

From //webrtc.gni:65

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 //webrtc.gni:125

Enable use of Android AAudio which requires Android SDK 26 or above and

NDK r16 or above.

rtc_enable_bwe_test_logging

Current value (from the default) = false

From //webrtc.gni:100

Set this to true to enable BWE test logging.

rtc_enable_external_auth

Current value (from the default) = false

From //webrtc.gni:93

Enable when an external authentication mechanism is used for performing

packet authentication for RTP packets instead of libsrtp.

rtc_enable_libevent

Current value (from the default) = false

From //webrtc.gni:225

rtc_enable_protobuf

Current value (from the default) = true

From //webrtc.gni:209

Enables the use of protocol buffers for debug recordings.

rtc_enable_sctp

Current value (from the default) = true

From //webrtc.gni:212

Set this to disable building with support for SCTP data channels.

rtc_enable_symbol_export

Current value (from the default) = false

From //webrtc.gni:41

Setting this to true will make RTC_EXPORT (see rtc_base/system/rtc_export.h)

expand to code that will manage symbols visibility.

rtc_exclude_field_trial_default

Current value (from the default) = false

From //webrtc.gni:53

rtc_exclude_metrics_default

Current value (from the default) = false

From //webrtc.gni:60

Setting this to true will define WEBRTC_EXCLUDE_METRICS_DEFAULT which

will tell the pre-processor to remove the default definition of symbols

needed to use metrics. In that case a new implementation needs to be

provided.

rtc_include_builtin_audio_codecs

Current value (from the default) = true

From //webrtc.gni:183

When set to false, builtin audio encoder/decoder factories and all the

audio codecs they depend on will not be included in libwebrtc.{a|lib}

(they will still be included in libjingle_peerconnection_so.so and

WebRTC.framework)

rtc_include_builtin_video_codecs

Current value (from the default) = true

From //webrtc.gni:189

When set to false, builtin video encoder/decoder factories and all the

video codecs they depends on will not be included in libwebrtc.{a|lib}

(they will still be included in libjingle_peerconnection_so.so and

WebRTC.framework)

rtc_include_ilbc

Current value (from the default) = true

From //webrtc.gni:68

Include the iLBC audio codec?

rtc_include_internal_audio_device

Current value (from the default) = true

From //webrtc.gni:241

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 //webrtc.gni:71

Disable this to avoid building the Opus audio codec.

rtc_include_pulse_audio

Current value (from the default) = true

From //webrtc.gni:237

Excluded in Chromium since its prerequisites don't require Pulse Audio.

rtc_include_tests

Current value (from the default) = true

From //webrtc.gni:244

Include tests in standalone checkout.

rtc_jsoncpp_root

Current value (from the default) = "//third_party/jsoncpp/source/include"

From //webrtc.gni:82

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 //webrtc.gni:218

rtc_link_pipewire

Current value (from the default) = false

From //webrtc.gni:118

Set this to link PipeWire directly instead of using the dlopen.

rtc_opus_support_120ms_ptime

Current value (from the default) = true

From //webrtc.gni:75

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 //webrtc.gni:78

Enable this to let the Opus audio codec change complexity on the fly.

rtc_prefer_fixed_point

Current value (from the default) = false

From //webrtc.gni:89

Selects fixed-point code where possible.

rtc_sanitize_coverage

Current value (from the default) = ""

From //webrtc.gni:137

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 //webrtc.gni:86

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_dummy_audio_file_devices

Current value (from the default) = false

From //webrtc.gni:162

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) = true

From //webrtc.gni:234

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 //webrtc.gni:158

rtc_use_lto

Current value (from the default) = false

From //webrtc.gni:130

Link-Time Optimizations.

Executes code generation at link-time instead of compile-time.

https://gcc.gnu.org/wiki/LinkTimeOptimization

rtc_use_metal_rendering

Current value (from the default) = false

From //webrtc.gni:177

Determines whether Metal is available on iOS/macOS.

rtc_use_pipewire

Current value (from the default) = false

From //webrtc.gni:115

Set this to use PipeWire on the Wayland display server.

By default it's only enabled on desktop Linux (excludes ChromeOS) and

only when using the sysroot as PipeWire is not available in older and

supported Ubuntu and Debian distributions.

rtc_use_x11

Current value (from the default) = false

From //webrtc.gni:109

Set this to false to skip building code that requires X11.

rtc_win_undef_unicode

Current value (from the default) = false

From //webrtc.gni:197

When set to true and in a standalone build, it will undefine UNICODE and

_UNICODE (which are always defined globally by the Chromium Windows

toolchain).

This is only needed for testing purposes, WebRTC wants to be sure it

doesn't assume /DUNICODE and /D_UNICODE but that it explicitly uses

wide character functions.

safe_browsing_mode

Current value (from the default) = 1

From //build/config/features.gni:44

sample_profile_is_accurate

Current value (from the default) = false

From //build/config/compiler/compiler.gni:103

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:107

Value for -fsanitize-coverage flag. Setting this causes

use_sanitizer_coverage to be enabled.

This flag is not used for libFuzzer (use_libfuzzer=true). Instead, we use:

-fsanitize=fuzzer-no-link

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

strip_absolute_paths_from_debug_symbols

Current value (from the default) = true

From //build/config/compiler/compiler.gni:198

strip_debug_info

Current value (from the default) = false

From //build/config/compiler/compiler.gni:40

Android-only: Strip the debug info of libraries within lib.unstripped to

reduce size. As long as symbol_level > 0, this will still allow stacks to be

symbolized.

symbol_level

Current value (from the default) = -1

From //build/config/compiler/compiler.gni:35

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 (from the default) = ""

(Internally set; try `gn help target_cpu`.)

target_os

Current value (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:32

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:24

possible values for target_winuwp_version:

"10" - Windows UWP 10

"8.1" - Windows RT 8.1

"8.0" - Windows RT 8.0

thin_lto_enable_optimizations

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:132

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:46

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:85

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_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:65

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:74

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:70

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:78

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:15

Enable Clang's Source-based Code Coverage.

use_clang_diagnostics_format

Current value (from the default) = false

From //build/config/win/BUILD.gn:41

Set this to use clang-style diagnostics format instead of MSVC-style, which

is useful in e.g. Emacs compilation mode.

E.g.:

Without this, clang emits a diagnostic message like this:

foo/bar.cc(12,34): error: something went wrong

and with this switch, clang emits it like this:

foo/bar.cc:12:34: error: something went wrong

use_custom_libcxx

Current value (from the default) = true

From //build/config/c++/c++.gni:14

use_custom_libcxx_for_host

Current value (from the default) = false

From //build/config/c++/c++.gni:25

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 = true

From //.gn:73

Overridden from the default = false

From //build/config/compiler/BUILD.gn:97

Allow projects that wish to stay on C++11 to override Chromium's default.

use_cxx11_on_android

Current value = false

From //.gn:76

Overridden from the default = true

From //build/config/compiler/BUILD.gn:140

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:50

use_debug_fission

Current value (from the default) = "default"

From //build/config/compiler/compiler.gni:56

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_dummy_lastchange

Current value (from the default) = false

From //build/util/lastchange.gni:9

use_ghash

Current value (from the default) = true

From //build/config/compiler/BUILD.gn:122

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:52

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_gold

Current value (from the default) = false

From //build/config/compiler/compiler.gni:184

use_goma

Current value (from the default) = false

From //build/toolchain/goma.gni:9

Set to true to enable distributed compilation using Goma.

use_icf

Current value (from the default) = false

From //build/config/compiler/BUILD.gn:156

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

webrtc windows 参数说明

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