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Lakshmipathi/v8gen.py.txt

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Created December 1, 2021 13:52
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gn args {V8}/out.gn/x64.release/ --list (V8 v7.1.163)
Raw
v8gen.py.txt
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:48
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:152
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:92
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:57
build_devil_arm_deps
Current value (from the default) = false
From //third_party/catapult/devil/devil_arm.gni:8
Whether to build Devil host dependencies for Linux arm, e.g. for use on
Raspberry Pis.
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:107
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:115
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) = "8.0.0"
From //build/toolchain/toolchain.gni:51
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:119
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:65
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) = 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:35
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:81
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:140
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:162
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:69
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) = "/root/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 (from the default) = false
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 (from the default) = false
From //build/config/BUILDCONFIG.gn:137
Set to true when compiling with the Clang compiler.
is_component_build
Current value (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 = 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) = 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 (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:57
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:55
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:124
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:96
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:109
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_afl=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:100
strip_debug_info
Current value (from the default) = false
From //build/config/compiler/compiler.gni:31
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: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 = "x64"
From //out.gn/x64.release/args.gn:2
Overridden 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:137
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 (from the default) = true
From //build/config/compiler/BUILD.gn:44
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 (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) = false
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 (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:103
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:145
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:47
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:128
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 (from the default) = false
From //build/config/compiler/compiler.gni:181
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) = true
From //build/config/compiler/BUILD.gn:161
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:61
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) = true
From //build/config/compiler/compiler.gni:172
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:64
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:86
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:146
use_sysroot
Current value (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:52
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:71
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) = true
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 (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
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