action_pool_depth
    Current value (from the default) = -1
      From //build/toolchain/BUILD.gn:10

    Pool for non goma tasks.

android_full_debug
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:49

    Normally, Android builds are lightly optimized, even for debug builds, to
    keep binary size down. Setting this flag to true disables such optimization

asan_globals
    Current value (from the default) = true
      From //build/config/sanitizers/sanitizers.gni:153

    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:93

    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:58

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:15

    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_format_svn_revision
    Current value (from the default) = "302580"
      From //buildtools/deps_revisions.gni:8

    The svn revisions that belong to the git hashes in DEPS. Used to cause full
    rebuilds on libc++ rolls.

clang_sample_profile_path
    Current value (from the default) = ""
      From //build/config/compiler/BUILD.gn:108

    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) = false
      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:116

    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.

compiler_timing
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:120

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

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.

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:95

    Helper variable for testing builds with disabled libfuzzer.
    Not for client use.

enable_full_stack_frames_for_profiling
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:66

    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) = 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_precompiled_headers
    Current value (from the default) = false
      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:38

    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_resource_whitelist_generation
    Current value (from the default) = false
      From //build/toolchain/gcc_toolchain.gni:26

fatal_linker_warnings
    Current value (from the default) = true
      From //build/config/compiler/BUILD.gn:82

    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

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.

force_local_build_id
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:141

    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:165

gcc_target_rpath
    Current value (from the default) = ""
      From //build/config/gcc/BUILD.gn:19

    When non empty, overrides the target rpath value. This allows a user to
    make a Chromium build where binaries and shared libraries are meant to be
    installed into separate directories, like /usr/bin/chromium and
    /usr/lib/chromium for instance. It is useful when a build system that
    generates a whole target root filesystem (like Yocto) is used on top of gn,
    especially when cross-compiling.
    Note: this gn arg is similar to gyp target_rpath generator flag.

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:70

    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) = "/sbuild-nonexistent/goma"
      From //build/toolchain/goma.gni:26

    Absolute directory containing the gomacc binary.

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) = "linux"
      (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 (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: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:18

    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:30

    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_cfi
    Current value = false
      From //out.gn/x64.release/args.gn:4
    Overridden from the default = true
      From //build/config/sanitizers/sanitizers.gni:57

    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 = false
      From //out.gn/x64.release/args.gn:5
    Overridden from the default = false
      From //build/config/BUILDCONFIG.gn:137

    Set to true when compiling with the Clang compiler.

is_component_build
    Current value = true
      From //out.gn/x64.release/args.gn:3
    Overridden from the default = false
      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 = false
      From //out.gn/x64.release/args.gn:1
    Overridden from the default = false
      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) = true
      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:15

    Compile for Leak Sanitizer to find leaks.

is_msan
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:18

    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_official_build
    Current value = true
      From //out.gn/x64.release/args.gn:2
    Overridden 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_safestack
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:37

    Compile with SafeStack shadow stack support.

is_tsan
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:21

    Compile for Thread Sanitizer to find threading bugs.

is_ubsan
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:25

    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:28

    Halt the program if a problem is detected.

is_ubsan_null
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:31

    Compile for Undefined Behaviour Sanitizer's null pointer checks.

is_ubsan_security
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:87

    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:34

    Compile for Undefined Behaviour Sanitizer's vptr checks.

is_win_fastlink
    Current value (from the default) = false
      From //build/config/compiler/compiler.gni:60

    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 on average. 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.

ldso_path
    Current value (from the default) = ""
      From //build/config/gcc/BUILD.gn:20

libcxx_svn_revision
    Current value (from the default) = "332543"
      From //buildtools/deps_revisions.gni:9

libcxxabi_svn_revision
    Current value (from the default) = "331450"
      From //buildtools/deps_revisions.gni:10

libunwind_svn_revision
    Current value (from the default) = "332513"
      From //buildtools/deps_revisions.gni:11

linux_use_bundled_binutils
    Current value (from the default) = true
      From //build/config/compiler/BUILD.gn:56

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

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:42

    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.

optimize_for_fuzzing
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:99

    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:125

    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

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:99

    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:110

    Value for -fsanitize-coverage flag. Setting this causes
    use_sanitizer_coverage to be enabled.
    This flag is not used for libFuzzer (use_libfuzzer=true) unless we are on
    Mac. 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) = false
      From //build/config/compiler/BUILD.gn:101

strip_debug_info
    Current value (from the default) = false
      From //build/config/compiler/compiler.gni:34

    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:29

    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

thin_lto_enable_optimizations
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:138

    Whether to enable ThinLTO optimizations. Turning ThinLTO optimizations on
    can substantially increase link time and binary size, but they generally
    also make binaries a fair bit faster.
   
    TODO(gbiv): We disable optimizations by default on most platforms because
    the space overhead is too great. We should use some mixture of profiles and
    optimization settings to better tune the size increase.

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 = false
      From //out.gn/x64.release/args.gn:7
    Overridden from the default = true
      From //build/config/compiler/BUILD.gn:45

    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:83

    Compile for fuzzing with AFL.

use_allocator
    Current value (from the default) = "tcmalloc"
      From //build/config/allocator.gni:28

    Memory allocator to use. Set to "none" to use default allocator.

use_allocator_shim
    Current value = false
      From //out.gn/x64.release/args.gn:11
    Overridden from the default = true
      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:63

    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:72

    Print detailed diagnostics when Control Flow Integrity detects a violation.

use_cfi_icall
    Current value (from the default) = true
      From //build/config/sanitizers/sanitizers.gni:68

    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:76

    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_custom_libcxx
    Current value = false
      From //out.gn/x64.release/args.gn:8
    Overridden 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: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:104

    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:146

    C++11 may not be an option if Android test infrastructure is used.

use_dbus
    Current value (from the default) = true
      From //build/config/features.gni:51

use_debug_fission
    Current value (from the default) = "default"
      From //build/config/compiler/compiler.gni:50

    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:91

    Compile for fuzzing with Dr. Fuzz
    See http://www.chromium.org/developers/testing/dr-fuzz

use_ghash
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:129

    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) = true
      From //build/config/features.gni:53

use_glib
    Current value (from the default) = true
      From //build/config/ui.gni:33

    Whether we should use glib, a low level C utility library.

use_gold
    Current value = false
      From //out.gn/x64.release/args.gn:10
    Overridden from the default = true
      From //build/config/compiler/compiler.gni:184

    Whether to use the gold linker from binutils instead of lld or bfd.

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:162

    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:64

    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_libfuzzer
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:80

    Compile for fuzzing with LLVM LibFuzzer.
    See http://www.chromium.org/developers/testing/libfuzzer

use_lld
    Current value (from the default) = false
      From //build/config/compiler/compiler.gni:175

use_locally_built_instrumented_libraries
    Current value (from the default) = false
      From //build/config/sanitizers/sanitizers.gni:51

    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_new_tcmalloc
    Current value (from the default) = false
      From //build/config/allocator.gni:37

    Use the new tcmalloc. It's relevant only when use_allocator == "tcmalloc".

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:67

    Whether or not we should use position independent code.

use_prebuilt_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 download prebuilt binaries from
    GCS.

use_rtti
    Current value (from the default) = false
      From //build/config/compiler/BUILD.gn:87

    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:147

use_sysroot
    Current value = false
      From //out.gn/x64.release/args.gn:9
    Overridden from the default = true
      From //build/config/sysroot.gni:18

use_thin_lto
    Current value (from the default) = false
      From //build/config/compiler/compiler.gni:55

    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
    TODO(https://crbug.com/887272): Reenable on is_android && is_official_build

use_udev
    Current value (from the default) = true
      From //build/config/features.gni:49

    libudev usage. This currently only affects the content layer.

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).

using_mismatched_sample_profile
    Current value (from the default) = false
      From //build/config/compiler/compiler.gni:74

    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 //BUILD.gn:23

    Print to stdout on Android.

v8_can_use_fpu_instructions
    Current value (from the default) = true
      From //BUILD.gn:126

    Similar to vfp but on MIPS.

v8_check_header_includes
    Current value (from the default) = false
      From //BUILD.gn:163

    Check that each header can be included in isolation (requires also
    setting the "check_v8_header_includes" gclient variable to run a
    specific hook).

v8_check_microtasks_scopes_consistency
    Current value (from the default) = ""
      From //BUILD.gn:152

    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 //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 //gni/v8.gni:16

    Includes files needed for correctness fuzzing.

v8_current_cpu
    Current value (from the default) = "x64"
      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_custom_deps
    Current value (from the default) = ""
      From //BUILD.gn:26

    Dynamically set an additional dependency from v8/custom_deps.

v8_deprecation_warnings
    Current value (from the default) = true
      From //BUILD.gn:42

    Enable compiler warnings when using V8_DEPRECATED apis.

v8_embed_script
    Current value (from the default) = ""
      From //BUILD.gn:48

    Embeds the given script into the snapshot.

v8_embedder_string
    Current value (from the default) = ""
      From //BUILD.gn:51

    Allows the embedder to add a custom suffix to the version string.

v8_enable_backtrace
    Current value (from the default) = ""
      From //gni/v8.gni:32

    Support for backtrace_symbols on linux.

v8_enable_concurrent_marking
    Current value (from the default) = true
      From //BUILD.gn:105

    Sets -dV8_CONCURRENT_MARKING

v8_enable_debugging_features
    Current value (from the default) = false
      From //BUILD.gn:30

    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 //BUILD.gn:54

    Sets -dENABLE_DISASSEMBLER.

v8_enable_embedded_builtins
    Current value (from the default) = true
      From //BUILD.gn:76

    Enable embedded builtins.
    TODO(jgruber,v8:6666): Support ia32 and maybe MSVC.

v8_enable_fast_mksnapshot
    Current value (from the default) = false
      From //BUILD.gn:72

    Enable fast mksnapshot runs.

v8_enable_future
    Current value (from the default) = false
      From //BUILD.gn:33

    Sets -DV8_ENABLE_FUTURE.

v8_enable_gdbjit
    Current value (from the default) = true
      From //BUILD.gn:147

v8_enable_handle_zapping
    Current value (from the default) = false
      From //BUILD.gn:66

    Sets -dENABLE_HANDLE_ZAPPING.

v8_enable_i18n_support
    Current value (from the default) = true
      From //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 //BUILD.gn:158

    Enable minor mark compact.

v8_enable_object_print
    Current value (from the default) = ""
      From //BUILD.gn:90

    Sets -dOBJECT_PRINT.

v8_enable_pointer_compression
    Current value (from the default) = false
      From //BUILD.gn:83

    Enable pointer compression (sets -dV8_COMPRESS_POINTERS).

v8_enable_slow_dchecks
    Current value (from the default) = false
      From //BUILD.gn:69

    Enable slow dchecks.

v8_enable_test_features
    Current value (from the default) = ""
      From //BUILD.gn:108

    Enables various testing features.

v8_enable_trace_feedback_updates
    Current value (from the default) = false
      From //BUILD.gn:102

    Sets -dV8_TRACE_FEEDBACK_UPDATES.

v8_enable_trace_ignition
    Current value (from the default) = false
      From //BUILD.gn:99

    Sets -dV8_TRACE_IGNITION.

v8_enable_trace_maps
    Current value (from the default) = ""
      From //BUILD.gn:93

    Sets -dV8_TRACE_MAPS.

v8_enable_v8_checks
    Current value (from the default) = ""
      From //BUILD.gn:96

    Sets -dV8_ENABLE_CHECKS.

v8_enable_verify_csa
    Current value (from the default) = false
      From //BUILD.gn:80

    Enable code-generation-time checking of types in the CodeStubAssembler.

v8_enable_verify_heap
    Current value (from the default) = ""
      From //BUILD.gn:36

    Sets -DVERIFY_HEAP.

v8_enable_verify_predictable
    Current value (from the default) = false
      From //BUILD.gn:39

    Sets -DVERIFY_PREDICTABLE

v8_enable_vtunejit
    Current value (from the default) = false
      From //BUILD.gn:63

    Sets -dENABLE_VTUNE_JIT_INTERFACE.

v8_experimental_extra_library_files
    Current value (from the default) = ["//test/cctest/test-experimental-extra.js"]
      From //BUILD.gn:144

v8_extra_library_files
    Current value (from the default) = ["//test/cctest/test-extra.js"]
      From //BUILD.gn:138

    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 //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 //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 (from the default) = true
      From //BUILD.gn:45

    Enable compiler warnings when using V8_DEPRECATE_SOON apis.

v8_interpreted_regexp
    Current value (from the default) = false
      From //BUILD.gn:87

    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 //gni/v8.gni:55

    Enable monolithic static library for embedders.

v8_multi_arch_build
    Current value (from the default) = false
      From //gni/v8.gni:19

    Adds additional compile target for building multiple architectures at once.

v8_no_inline
    Current value (from the default) = false
      From //BUILD.gn:120

    Switches off inlining in V8.

v8_optimized_debug
    Current value (from the default) = true
      From //gni/v8.gni:29

    Turns on compiler optimizations in V8 in Debug build.

v8_os_page_size
    Current value (from the default) = "0"
      From //BUILD.gn:123

    Override OS page size when generating snapshot

v8_perf_prof_unwinding_info
    Current value (from the default) = false
      From //BUILD.gn:112

    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 //BUILD.gn:117

    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 //BUILD.gn:57

    Sets the number of internal fields on promise objects.

v8_snapshot_toolchain
    Current value (from the default) = ""
      From //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 //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 //BUILD.gn:132

    Controls the threshold for on-heap/off-heap Typed Arrays.

v8_untrusted_code_mitigations
    Current value (from the default) = true
      From //BUILD.gn:155

    Enable mitigations for executing untrusted code.

v8_use_external_startup_data
    Current value = false
      From //out.gn/x64.release/args.gn:6
    Overridden from the default = ""
      From //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 //BUILD.gn:129

    Similar to the ARM hard float ABI but on MIPS.

v8_use_multi_snapshots
    Current value (from the default) = false
      From //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 //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