List of “selectors” to request variant builds of certain targets. Each selector specifies matching criteria and a chosen variant. The first selector in the list to match a given target determines which variant is used for that target.
Each selector is either a string or a scope. A shortcut selector is a string; it gets expanded to a full selector. A full selector is a scope, described below.
A string selector can match a name in select_variant_shortcuts. If it‘s not a specific shortcut listed there, then it can be the name of any variant described in known_variants and universal_variants (and combinations thereof). A selector that’s a simple variant name selects for every binary built in the target toolchain: { host=false variant=selector }.
If a string selector contains a slash, then it‘s "shortcut/filename" and selects only the binary in the target toolchain whose output_name matches "filename", i.e. it adds output_name=["filename"] to each selector scope that the shortcut’s name alone would yield.
The scope that forms a full selector defines some of these:
variant (required)
[string or `false`] The variant that applies if this selector
matches. This can be `false` to choose no variant, or a string
that names the variant. See
[`known_variants`](#known_variants) and
[`universal_variants`](#universal_variants).
The rest below are matching criteria. All are optional. The selector matches if and only if all of its criteria match. If none of these is defined, then the selector always matches.
The first selector in the list to match wins and then the rest of the list is ignored. So construct more complex rules by using a “blacklist” selector with variant=false before a catch-all or “whitelist” selector that names a variant.
Each “[strings]” criterion is a list of strings, and the criterion is satisfied if any of the strings matches against the candidate string.
host
[boolean] If true, the selector matches in the host toolchain.
If false, the selector matches in the target toolchain.
testonly
[boolean] If true, the selector matches targets with testonly=true.
If false, the selector matches in targets without testonly=true.
target_type
[strings]: `"executable"`, `"loadable_module"`, or `"driver_module"`
output_name
[strings]: target's `output_name` (default: its `target name`)
label
[strings]: target's full label with `:` (without toolchain suffix)
name
[strings]: target's simple name (label after last `/` or `:`)
dir
[strings]: target's label directory (`//dir` for `//dir:name`).
Current value (from the default): []
From //build/config/BUILDCONFIG.gn:622
Current value (from the default): ""
From //topaz/runtime/flutter_runner/prebuilt_framework.gni:7
Current value (from the default): false
From //third_party/skia/BUILD.gn:72
Current value for target_cpu = "arm64": false
From //.gn:28
Overridden from the default: true
From //third_party/skia/BUILD.gn:23
Current value for target_cpu = "x64": false
From //.gn:28
Overridden from the default: false
From //third_party/skia/BUILD.gn:23
Current value (from the default): false
From //third_party/skia/BUILD.gn:33
Current value (from the default): "/b/s/w/ir/k/third_party/mako"
From //garnet/lib/magma/gnbuild/magma.gni:14
Current value (from the default): false
From //third_party/skia/BUILD.gn:70
Current value (from the default): true
From //third_party/skia/BUILD.gn:28
Whether to build SDK tarballs.
Current value (from the default): false
From //build/sdk/sdk.gni:13
Whether to link the standalone VM against tcmalloc. The standalone build of the VM enables this only for Linux builds.
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:47
Current value (from the default): true
From //garnet/bin/ui/scenic/BUILD.gn:12
go_vet_enabled [bool] if false, go vet invocations are disabled for all builds.
Current value (from the default): false
From //build/go/go_build.gni:20
This is a list of targets that will be built as verisilicon vulkan ICDS.
Current value (from the default): []
From //garnet/lib/magma/gnbuild/magma.gni:41
Whether the VM includes the kernel service in all modes (debug, release, product).
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:88
Current value (from the default): false
From //third_party/skia/BUILD.gn:64
Current value (from the default): false
From //third_party/skia/BUILD.gn:71
Current value (from the default): ""
From //third_party/skia/BUILD.gn:49
Whether to fall back to built-in root certificates when they cannot be verified at the operating system level.
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:43
List of arguments to add to /boot/config/devmgr. These come after synthesized arguments to configure blobfs and pkgfs.
Current value (from the default): []
From //build/images/BUILD.gn:465
Current value (from the default): "flutter_jit_app"
From //topaz/runtime/dart/dart_component.gni:12
Files containing additional kernel command line arguments to bake into the boot image. The contents of these files (in order) come after any arguments directly in kernel_cmdline_args. These can be GN // source pathnames or absolute system pathnames.
Current value (from the default): []
From //build/images/BUILD.gn:476
Sets the default LTO type for rustc bulids.
Current value (from the default): "unset"
From //build/rust/config.gni:20
Sets whether Rust compiler warnings cause errors or not. “deny” will make all warnings into errors, while “allow” will ignore warnings
Current value (from the default): "deny"
From //build/rust/config.gni:27
Current value (from the default): false
From //third_party/flutter/shell/config.gni:6
In addition to reserving space for inodes and data, fs needs additional space for maintaining some internal data structures. So the space required to reserve inodes and data may exceed sum of the space needed for inodes and data. maximum_bytes puts an upper bound on the total bytes reserved for inodes, data bytes and reservation for all other internal fs metadata. An empty string does not put any upper bound. A filesystem may reserve few blocks required for its operations.
Current value (from the default): ""
From //build/images/fvm.gni:47
Controls whether dart_app() targets generate JIT or AOT Dart snapshots. This defaults to JIT, use `fx set --args ‘dart_default_app=“dart_aot_app”’ to switch to AOT.
Current value (from the default): "dart_jit_app"
From //topaz/runtime/dart/dart_component.gni:19
Current value (from the default): "undefined"
From //build/config/host_byteorder.gni:7
In protected mode, faults don‘t return as much information so they’re much harder to debug. To work around that, add a mode where protected atoms are executed in non-protected mode and vice-versa.
NOTE: The memory security ranges should also be set (in TrustZone) to the opposite of normal, so that non-protected mode accesses can only access protected memory and vice versa. Also, growable memory faults won't work in this mode, so larger portions of growable memory should precommitted (which is not done by default).
Current value (from the default): false
From //garnet/drivers/gpu/msd-arm-mali/src/BUILD.gn:23
Explicitly set the target architecture to use a simulator. Available options are: arm, arm64, x64, ia32, and dbc.
Current value (from the default): "arm64"
From //third_party/dart/runtime/runtime_args.gni:32
Current value (from the default): false
From //third_party/skia/BUILD.gn:87
If you add package labels to this variable, the packages will be included in the ‘cache’ package set, which represents an additional set of software that is made available on disk immediately after paving and in factory flows. These packages are not updated with an OTA, but instead are updated ephemerally. This cache of software can be evicted by the system if storage pressure arises or other policies indicate.
Current value for target_cpu = "arm64": []
From //products/core.gni:24
Overridden from the default: []
From //BUILD.gn:22
Current value for target_cpu = "x64": []
From //products/core.gni:24
Overridden from the default: []
From //BUILD.gn:22
Sets the fuchsia toolchain target triple suffix (after arch)
Current value (from the default): "fuchsia"
From //build/rust/config.gni:23
Current value (from the default): "//zircon"
From //garnet/lib/magma/gnbuild/magma.gni:12
A list of labels for meta packages to be included in the monolith.
Current value for target_cpu = "arm64": ["//build/images:config-data", "//build/images:shell-commands", "//garnet/bin/component_index:component_index"]
From //products/core.gni:11
Overridden from the default: []
From //build/images/BUILD.gn:36
Current value for target_cpu = "x64": ["//build/images:config-data", "//build/images:shell-commands", "//garnet/bin/component_index:component_index"]
From //products/core.gni:11
Overridden from the default: []
From //build/images/BUILD.gn:36
Current value (from the default): true
From //third_party/skia/BUILD.gn:43
Whether to only warn when an SDK has been modified. If false, any unacknowledged SDK change will cause a build failure.
Current value (from the default): false
From //build/sdk/config.gni:8
Does nothing.
Will be removed after 30 April 2019.
Current value (from the default): false
From //BUILD.gn:39
Current value (from the default): "//garnet/lib/magma"
From //garnet/lib/magma/gnbuild/magma.gni:8
Current value (from the default): true
From //third_party/skia/gn/skia.gni:14
Current value (from the default): false
From //third_party/mesa/src/intel/vulkan/BUILD.gn:25
The optimization level to use for debug builds. Defaults to 0 for builds with code coverage enabled.
Current value (from the default): "2"
From //third_party/dart/runtime/runtime_args.gni:36
Current value (from the default): "//third_party/glm"
From //garnet/lib/magma/gnbuild/magma.gni:11
The absolute path of the sysroot that is used with the target toolchain.
Current value (from the default): ""
From //build/config/sysroot.gni:7
Current value (from the default): ""
From //build/images/BUILD.gn:42
Temporary flag, switches Flutter to using Scenic's new View API.
Current value (from the default): false
From //garnet/bin/ui/scenic/config.gni:7
Current value (from the default): true
From //third_party/skia/modules/skottie/BUILD.gn:9
Current value (from the default): false
From //third_party/skia/gn/skia.gni:12
Current value (from the default): true
From //garnet/bin/ui/scenic/BUILD.gn:14
Current value (from the default): true
From //topaz/runtime/dart/dart_component.gni:32
Current value (from the default): ""
From //garnet/bin/guest/pkg/linux_guest/BUILD.gn:13
Enable this to have the msd include a suite of tests and invoke them automatically when the driver starts.
Current value (from the default): false
From //garnet/lib/magma/gnbuild/magma.gni:21
List of extra manifest entries for files to add to the BOOTFS. Each entry can be a “TARGET=SOURCE” string, or it can be a scope with sources and outputs in the style of a copy() target: outputs[0] is used as TARGET (see gn help source_expansion).
Current value (from the default): []
From //build/images/BUILD.gn:482
Maximum number of Go processes to run in parallel.
Current value (from the default): 16
From //build/go/BUILD.gn:11
Current value (from the default): ""
From //third_party/skia/BUILD.gn:56
Mesa doesn‘t properly handle loader-less operation; their GetInstanceProcAddr implementation returns 0 for some interfaces. On ARM there may be multiple libvulkan_arms, so they can’t all be linked to.
Current value (from the default): true
From //garnet/lib/magma/gnbuild/magma.gni:31
Specifies whether Scenic uses the new “PaperRenderer2” when rendering Scenes with fuchsia.ui.gfx.ShadowTechnique.UNSHADOWED.
Current value (from the default): true
From //garnet/lib/ui/gfx/BUILD.gn:12
Current value (from the default):
[{
configs = []
name = "release"
toolchain_args = {
is_debug = false
}
}]
From //build/config/BUILDCONFIG.gn:422
Current value (from the default): "10.0.0.1"
From //garnet/bin/guest/pkg/biscotti_guest/linux_runner/BUILD.gn:18
Current value for target_cpu = "arm64": false
From //.gn:26
Overridden from the default: true
From //third_party/skia/BUILD.gn:62
Current value for target_cpu = "x64": false
From //.gn:26
Overridden from the default: false
From //third_party/skia/BUILD.gn:62
Current value (from the default): false
From //third_party/skia/BUILD.gn:35
If true, then the paving script will pave vbmeta images to the target device. It is assumed that the vbmeta image will be created by the custom_signing_script.
Current value (from the default): false
From //build/images/custom_signing.gni:16
Current value (from the default): ""
Maximum allowable size for the FVM in a release mode build Zero means no limit
Current value (from the default): "0"
From //build/images/max_fvm_size.gni:8
Enable all 8 cores, which is faster but emits more heat.
Current value (from the default): true
From //garnet/drivers/gpu/msd-arm-mali/src/BUILD.gn:9
Current value (from the default): false
From //build/images/BUILD.gn:46
The runtime mode (“debug”, “profile”, “release”, “dynamic_profile”, or “dynamic_release”)
Current value (from the default): "debug"
From //third_party/flutter/common/config.gni:15
The size in bytes of the FVM partition image to create. Normally this is computed to be just large enough to fit the blob and data images. The default value is "", which means to size based on inputs. Specifying a size that is too small will result in build failure.
Current value (from the default): ""
From //build/images/fvm.gni:12
Whether basemgr and dev_base_shell should use account_manager for account creation. This is a temporary flag while modular transitions to use account manager.
Current value (from the default): true
From //peridot/bin/basemgr/BUILD.gn:18
TODO(davemoore): Remove this entire mechanism once standalone scudo is the default (DNO-442) Enable the Scudo memory allocator.
Current value (from the default): false
From //build/config/scudo/scudo.gni:10
Current value (from the default): false
From //third_party/skia/BUILD.gn:52
Current value (from the default): 0
From //third_party/skia/BUILD.gn:54
Current value (from the default): true
From //third_party/skia/BUILD.gn:38
Current value (from the default): ""
From //build/images/BUILD.gn:40
Number of bytes to reserve for data in the fs. This is in addition to what is reserved, if any, for the inodes. Data bytes constitutes “usable” space of the fs. An empty string does not reserve any additional space than minimum required for the filesystem.
Current value (from the default): ""
From //build/images/fvm.gni:36
Current value (from the default): "projects/fuchsia-infra/locations/global/keyRings/test-secrets/cryptoKeys"
From //build/testing/secret_spec.gni:8
Current value (from the default): "kernel"
From //third_party/dart/utils/application_snapshot.gni:14
If true, the extras.img will be built and mounted inside the container at /mnt/chromeos.
This is useful for including some GN-built binaries into the guest image without modifying the termina images.
Current value (from the default): false
From //garnet/bin/guest/pkg/biscotti_guest/linux_runner/BUILD.gn:26
Current value (from the default): "fuchsia"
From //third_party/crashpad/build/crashpad_buildconfig.gni:22
Whether to enable code coverage for the standalone VM.
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:39
Current value (from the default): false
From //sdk/BUILD.gn:12
Whether basemgr should automatically login as a persistent guest user.
Current value (from the default): false
From //peridot/bin/basemgr/BUILD.gn:13
Current value (from the default): "255.255.255.0"
From //garnet/bin/guest/pkg/biscotti_guest/linux_runner/BUILD.gn:19
List of kernel command line arguments to bake into the Zedboot image. See //zircon/docs/kernel_cmdline.md and zedboot_devmgr_config.
Current value (from the default): []
From //build/images/zedboot/BUILD.gn:17
Zircon GN build arguments. The default passes through GOMA settings and select_variant shorthand selectors. Only set this if you want to wipe out all the defaults that propagate from Fuchsia GN to Zircon GN. The default value folds in zircon_extra_args, so usually it's better to just set zircon_extra_args and leave zircon_args alone. Any individual Zircon build argument set in zircon_extra_args will silently clobber the default value shown here.
Current value (from the default):
{
default_deps = [":legacy-arm64"]
enable_kernel_debugging_features = false
goma_dir = "/home/swarming/goma"
use_goma = false
variants = []
}
From //build/config/fuchsia/zircon.gni:45
Current value (from the default): ""
From //third_party/flutter/shell/version/version.gni:8
Current value (from the default): "warn,error"
From //third_party/vulkan_loader_and_validation_layers/loader/BUILD.gn:26
Enables the tracing feature of mdns, which can be turned on using “mdns-util verbose”.
Current value (from the default): false
From //garnet/bin/mdns/service/BUILD.gn:15
Current value (from the default): ""
From //garnet/lib/magma/gnbuild/magma.gni:23
Current value for target_cpu = "arm64": true
From //.gn:24
Overridden from the default: false
From //third_party/skia/BUILD.gn:16
Current value for target_cpu = "x64": true
From //.gn:24
Overridden from the default: false
From //third_party/skia/BUILD.gn:16
Current value (from the default): false
From //third_party/skia/BUILD.gn:69
List of kernel command line arguments to bake into the boot image. See also //zircon/docs/kernel_cmdline.md and devmgr_config.
Current value (from the default): []
From //build/images/BUILD.gn:470
Current value (from the default): false
From //third_party/skia/BUILD.gn:65
Current value (from the default): false
From //third_party/skia/BUILD.gn:51
Current value (from the default): false
From //third_party/skia/BUILD.gn:36
Manifest files describing target libraries from toolchains. Can be either // source paths or absolute system paths.
Current value (from the default): ["/b/s/w/ir/k/buildtools/linux-x64/clang/lib/aarch64-fuchsia.manifest"]
From //build/images/manifest.gni:11
Product configuration of the current build
Current value (from the default): ""
From //garnet/BUILD.gn:21
With this flag set the system tries to use cache coherent memory if the GPU supports it.
Current value (from the default): true
From //garnet/drivers/gpu/msd-arm-mali/src/BUILD.gn:13
Current value (from the default): "LLVM"
From //third_party/skia/BUILD.gn:57
Include the vulkan validation layers in scenic.
Current value (from the default): true
From //garnet/bin/ui/BUILD.gn:40
Current value (from the default): false
From //third_party/skia/BUILD.gn:48
This argument specifies from where the system should obtain the zxcrypt master key to the system data partition.
This value be reified as /boot/config/zxcrypt in both the zircon boot image and the zedboot boot image, for consumption by fshost and the paver, respectively.
Acceptable values are:
In the future, we may consider adding support for TPMs, or additional logic to explicitly support fallback behavior.
Current value (from the default): "null"
From //build/images/zxcrypt.gni:23
Controls the kind of core snapshot linked into the standalone VM. Using a core-jit snapshot breaks the ability to change various flags that affect code generation.
Current value (from the default): "core"
From //third_party/dart/runtime/runtime_args.gni:56
Additional SSH authorized_keys file to include in the build. For example: extra_authorized_keys_file="$HOME/.ssh/id_rsa.pub"
Current value (from the default): ""
From //third_party/openssh-portable/fuchsia/developer-keys/BUILD.gn:11
Sets a custom base directory for rustc and cargo. This can be used to test custom Rust toolchains.
Current value (from the default): "//buildtools/linux-x64/rust/bin"
From //build/rust/config.gni:17
Number of parallel ThinLTO jobs.
Current value (from the default): 8
From //build/config/lto/config.gni:13
Board configuration of the current build
Current value (from the default): ""
From //garnet/BUILD.gn:24
Default values for the guest network configuration.
These are currently hard-coded to match what is setup in the virtio-net device.
See //garnet/bin/guest/vmm/device/virtio_net.cc for more details.
Current value (from the default): "10.0.0.2"
From //garnet/bin/guest/pkg/biscotti_guest/linux_runner/BUILD.gn:17
Current value (from the default): true
From //third_party/skia/gn/skia.gni:11
Use a prebuilt ffmpeg binary rather than building it locally. See //src/media/lib/ffmpeg/README.md for details. This is ignored when building in variant builds for which there is no prebuilt. In that case, ffmpeg is always built from source so as to be built with the selected variant's config. When this is false (either explicitly or in a variant build) then //third_party/ffmpeg must be in the source tree, which requires: jiri import -name integration third_party/ffmpeg https://fuchsia.googlesource.com/integration
Current value (from the default): true
From //src/media/lib/ffmpeg/BUILD.gn:14
Logical version of the current build. If not set, defaults to the timestamp of the most recent update.
Current value (from the default): ""
From //garnet/BUILD.gn:28
When this argument is a non-empty string, the version repoted by the Dart VM will be one that is compatible with pub's interpretation of semantic version strings. The version string will also include the values of the argument. In particular the version string will read:
"M.m.p-dev.x.x-$(dart_custom_version_for_pub)-$(short_git_hash)"
Where ‘M’, ‘m’, and ‘p’ are the major, minor and patch version numbers, and ‘dev.x.x’ is the dev version tag most recently preceeding the current revision. The short git hash can be omitted by setting dart_version_git_info=false
Current value (from the default): ""
From //third_party/dart/runtime/runtime_args.gni:73
Identifier for the Core SDK.
Current value (from the default): ""
From //sdk/config.gni:7
Current value (from the default): true
From //third_party/skia/BUILD.gn:67
Additional variant toolchain configs to support. This is just added to known_variants.
Current value (from the default): []
From //build/config/BUILDCONFIG.gn:402
When AOT compiling, an app will reference objects in the sharing basis‘s snapshot when available instead of writing the objects in its own snapshot. The snapshot of the sharing basis app will be included in every other app’s package and deduplicated by blobfs.
Current value (from the default): ""
From //topaz/runtime/dart/dart_component.gni:27
Debug build.
Current value (from the default): true
From //build/config/BUILDCONFIG.gn:11
List of short names for commonly-used variant selectors. Normally this is not set as a build argument, but it serves to document the available set of short-cut names for variant selectors. Each element of this list is a scope where .name is the short name and .select_variant is a a list that can be spliced into select_variant.
Current value (from the default):
[{
name = "host_asan"
select_variant = [{
dir = ["//third_party/yasm", "//third_party/vboot_reference", "//garnet/tools/vboot_reference"]
host = true
variant = "asan_no_detect_leaks"
}, {
host = true
variant = "asan"
}]
}, {
name = "asan"
select_variant = [{
target_type = ["driver_module"]
variant = false
}, {
host = false
variant = "asan"
}]
}]
From //build/config/BUILDCONFIG.gn:448
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.
Current value (from the default): 2
From //build/config/compiler.gni:13
ThinLTO cache directory path.
Current value (from the default): "dartlang/thinlto-cache"
From //build/config/lto/config.gni:16
Build boot images that prefer Zedboot over local boot (only for EFI).
Current value (from the default): false
From //build/images/BUILD.gn:796
Current value (from the default): "//third_party/expat"
From //garnet/lib/magma/gnbuild/magma.gni:9
Current value (from the default): false
From //third_party/skia/BUILD.gn:59
Current value (from the default): true
From //third_party/skia/gn/skia.gni:13
Whether the component loader should automatically update packages.
Current value (from the default): true
From //garnet/bin/sysmgr/BUILD.gn:10
Whether to link Crashpad library for crash handling. Only supported on Windows for now.
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:51
Current value for target_cpu = "arm64": false
From //.gn:27
Overridden from the default: true
From //third_party/skia/BUILD.gn:22
Current value for target_cpu = "x64": false
From //.gn:27
Overridden from the default: true
From //third_party/skia/BUILD.gn:22
Consolidated build toggle for use of Vulkan across Fuchsia
Current value (from the default): true
From //build/vulkan/config.gni:7
The package key to use for signing Fuchsia packages made by the package() template (and the system_image package). If this doesn‘t exist yet when it’s needed, it will be generated. New keys can be generated with the pm -k FILE genkey host command.
Current value (from the default): "//build/development.key"
From //build/package.gni:18
Selects the wlan configuration type to use. Choices: “client” - client mode “ap” - access point mode "" (empty string) - no configuration
Current value (from the default): "client"
From //src/connectivity/wlan/wlancfg/BUILD.gn:15
Files containing additional kernel command line arguments to bake into the Zedboot image. The contents of these files (in order) come after any arguments directly in zedboot_cmdline_args. These can be GN // source pathnames or absolute system pathnames.
Current value (from the default): []
From //build/images/zedboot/BUILD.gn:23
Forces all Dart and Flutter apps to build in a specific configuration that we use to build products.
Current value (from the default): false
From //topaz/runtime/dart/config.gni:10
Current value (from the default): false
From //third_party/skia/BUILD.gn:20
Current value (from the default): false
From //third_party/skia/BUILD.gn:21
Current value (from the default): ""
From //build/images/BUILD.gn:41
Current value (from the default): false
From //garnet/lib/ui/gfx/BUILD.gn:8
Current value for target_cpu = "arm64": false
From //.gn:30
Overridden from the default: true
From //third_party/skia/BUILD.gn:63
Current value for target_cpu = "x64": false
From //.gn:30
Overridden from the default: false
From //third_party/skia/BUILD.gn:63
The secmem TA must be obtained elsewhere and put into the firmware directory.
Current value (from the default): false
From //garnet/bin/sysmem-assistant/BUILD.gn:44
Current value (from the default): false
From //third_party/skia/BUILD.gn:24
List of arguments to populate /boot/config/devmgr in the Zedboot image.
Current value (from the default): ["netsvc.netboot=true"]
From //build/images/zedboot/BUILD.gn:26
Whether experimental space dart mode is enabled for Dart applications.
Current value (from the default): false
From //topaz/runtime/dart/dart_component.gni:41
Package the rootfs as a QCOW image (as opposed to a flat file).
Current value (from the default): true
From //garnet/bin/guest/pkg/debian_guest/BUILD.gn:9
Current value (from the default): false
From //third_party/flutter/BUILD.gn:10
Absolute directory containing the Goma source code.
Current value (from the default): "/home/swarming/goma"
From //build/toolchain/goma.gni:12
This should never be set as a build argument. It exists only to be set in toolchain_args. See //build/toolchain/clang_toolchain.gni for details. This variable is a scope giving details about the current toolchain: toolchain_variant.base [label] The “base” toolchain for this variant, often the right thing to use in comparisons, not current_toolchain. This is the toolchain actually referenced directly in GN source code. If the current toolchain is not shlib_toolchain or a variant toolchain, this is the same as current_toolchain. In one of those derivative toolchains, this is the toolchain the GN code probably thought it was in. This is the right thing to use in a test like toolchain_variant.base == target_toolchain, rather rather than comparing against current_toolchain. toolchain_variant.name [string] The name of this variant, as used in variant fields in select_variant clauses. In the base toolchain and its shlib_toolchain, this is "". toolchain_variant.suffix [string] This is “-${toolchain_variant.name}”, "" if name is empty. toolchain_variant.is_pic_default [bool] This is true in shlib_toolchain. The other fields are the variant's effects as defined in known_variants.
Current value (from the default):
{
base = "//build/toolchain/fuchsia:arm64"
}
From //build/config/BUILDCONFIG.gn:74
Current value (from the default): false
From //third_party/skia/BUILD.gn:31
Current value (from the default): true
From //build/config/fuchsia/BUILD.gn:201
This should never be set as a build argument. It exists only to be set in toolchain_args. See //build/toolchain/clang_toolchain.gni for details.
Current value (from the default): []
From //build/config/BUILDCONFIG.gn:627
Current value (from the default): true
From //third_party/skia/modules/particles/BUILD.gn:7
Current value (from the default): true
From //third_party/skia/BUILD.gn:27
minimum_inodes is the number of inodes to reserve for the fs An empty string does not reserve any additional space than minimum required for the filesystem.
Current value (from the default): ""
From //build/images/fvm.gni:28
Selects the SoftMAC client implementation to use. Choices: false (default) - C++ Client MLME implementation true - Rust Client MLME implementation This argument is temporary until Rust MLME is ready to be used.
Current value (from the default): false
From //src/connectivity/wlan/lib/mlme/cpp/BUILD.gn:10
Current value (from the default): ""
From //build/images/fvm.gni:29
Current value (from the default): false
From //third_party/skia/BUILD.gn:50
Current value (from the default): true
From //third_party/skia/BUILD.gn:34
A list of package labels to include in the ‘base’ package set. Used by the board definition rather than the product definition.
Current value for target_cpu = "arm64": ["//garnet/packages/prod:drivers", "//garnet/packages/prod:sysmem-assistant"]
From //boards/arm64.gni:9
Overridden from the default: []
From //BUILD.gn:34
Current value for target_cpu = "x64": ["//garnet/packages/prod:drivers"]
From //boards/x64.gni:13
Overridden from the default: []
From //BUILD.gn:34
Clang crash reports directory path. Use empty path to disable altogether.
Current value (from the default): "//root_build_dir/clang-crashreports"
From //build/config/BUILD.gn:9
Instead of using is_debug, we introduce a different flag for specifying a Debug build of Dart so that clients can still use a Release build of Dart while themselves doing a Debug build.
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:9
Current value (from the default): false
From //third_party/skia/BUILD.gn:30
Whether experimental space dart mode is enabled for Flutter applications.
Current value (from the default): false
From //topaz/runtime/dart/dart_component.gni:38
Current value (from the default): "30000"
From //garnet/bin/log_listener/BUILD.gn:14
Current value (from the default): true
From //third_party/skia/BUILD.gn:41
Current value for target_cpu = "arm64": "arm64"
From //boards/arm64.gni:5
Overridden from the default: ""
Current value for target_cpu = "x64": "x64"
From //boards/x64.gni:5
Overridden from the default: ""
Current value (from the default): ""
From //build/images/BUILD.gn:43
The size of the FVM partition images “slice size”. The FVM slice size is a minimum size of a particular chunk of a partition that is stored within FVM. A very small slice size may lead to decreased throughput. A very large slice size may lead to wasted space. The selected default size of 8mb is selected for conservation of space, rather than performance.
Current value (from the default): "8388608"
From //build/images/fvm.gni:19
gocache_dir Directory GOCACHE environment variable will be set to. This directory will have build and test results cached, and is safe to be written to concurrently. If overridden, this directory must be a full path.
Current value (from the default): "/b/s/w/ir/k/root_build_dir/host_x64/.gocache"
From //build/go/go_build.gni:16
Current value (from the default): ""
From //build/images/fvm.gni:37
Current value (from the default): true
From //build/persist_logs.gni:13
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.
Current value (from the default): true
From //third_party/icu/config.gni:15
Controls how many bytes of space on disk are used to persist device logs. Should be a string value that only contains digits.
Current value (from the default): "0"
From //garnet/bin/log_listener/BUILD.gn:13
Current value (from the default): false
From //third_party/skia/BUILD.gn:68
TODO: set skia_pdf_subset_harfbuzz to skia_use_harfbuzz.
Current value (from the default): false
From //third_party/skia/gn/skia.gni:18
Current value for target_cpu = "arm64": false
From //.gn:29
Overridden from the default: true
From //third_party/skia/BUILD.gn:29
Current value for target_cpu = "x64": false
From //.gn:29
Overridden from the default: false
From //third_party/skia/BUILD.gn:29
Set to true to enable distributed compilation using Goma.
Current value (from the default): false
From //build/toolchain/goma.gni:9
This is a list of targets that will be built as verisilicon vulkan ICDS.
Current value (from the default): []
From //garnet/lib/magma/gnbuild/magma.gni:44
Maximum number of Rust processes to run in parallel.
We run multiple rustc jobs in parallel, each of which can cause significant amount of memory, especially when using LTO. To avoid out-of-memory errors we explicitly reduce the number of jobs.
Current value (from the default): 14
From //build/rust/BUILD.gn:15
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:101
Allow for deduping the VM between standalone, flutter_runner and dart_runner.
Current value (from the default): "shared_library"
From //third_party/dart/runtime/runtime_args.gni:78
Maximum number of Dart processes to run in parallel.
Dart analyzer uses a lot of memory which may cause issues when building with many parallel jobs e.g. when using goma. To avoid out-of-memory errors we explicitly reduce the number of jobs.
Current value (from the default): 16
From //build/dart/BUILD.gn:15
Extra args to globally apply to the manifest generation script.
Current value (from the default): []
From //build/images/manifest.gni:22
Current value (from the default): "linux"
Use ThinLTO variant of LTO if use_lto = true.
Current value (from the default): true
From //build/config/lto/config.gni:10
Maximum number of concurrent link jobs.
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 value (from the default): 16
From //build/toolchain/BUILD.gn:15
Current value (from the default): false
From //third_party/skia/BUILD.gn:44
Current value for target_cpu = "arm64": false
From //.gn:25
Overridden from the default: true
From //third_party/skia/BUILD.gn:45
Current value for target_cpu = "x64": false
From //.gn:25
Overridden from the default: true
From //third_party/skia/BUILD.gn:45
module_suggester is not AOT compiled in debug builds
Current value (from the default): ""
From //topaz/runtime/dart/dart_component.gni:51
Set the runtime mode. This affects how the runtime is built and what features it has. Valid values are: ‘develop’ (the default) - VM is built to run as a JIT with all development features enabled. ‘profile’ - The VM is built to run with AOT compiled code with only the CPU profiling features enabled. ‘release’ - The VM is built to run with AOT compiled code with no developer features enabled.
These settings are only used for Flutter, at the moment. A standalone build of the Dart VM should leave this set to “develop”, and should set ‘is_debug’, ‘is_release’, or ‘is_product’.
TODO(rmacnak): dart_runtime_mode no longer selects whether libdart is build for JIT or AOT, since libdart waw split into libdart_jit and libdart_precompiled_runtime. We should remove this flag and just set dart_debug/dart_product.
Current value (from the default): "develop"
From //third_party/dart/runtime/runtime_args.gni:28
Current value (from the default): "x64"
Current value (from the default): true
From //third_party/skia/BUILD.gn:25
Current value for target_cpu = "arm64": []
From //boards/arm64.gni:7
Overridden from the default: []
From //BUILD.gn:40
Current value for target_cpu = "x64": []
From //boards/x64.gni:9
Overridden from the default: []
From //BUILD.gn:40
Use vboot images
Current value (from the default): false
From //build/images/boot.gni:11
If you add package labels to this variable, the packages will be included in the ‘universe’ package set, which represents all software that is produced that is to be published to a package repository or to the SDK by the build. The build system ensures that the universe package set includes the base and cache package sets, which means you do not need to redundantly include those labels in this variable.
Current value for target_cpu = "arm64": ["//garnet/packages/prod:vboot_reference", "//bundles:tools"]
From //products/core.gni:26
Overridden from the default: []
From //BUILD.gn:30
Current value for target_cpu = "x64": ["//garnet/packages/prod:vboot_reference", "//bundles:tools"]
From //products/core.gni:26
Overridden from the default: []
From //BUILD.gn:30
Current value (from the default): true
From //third_party/skia/modules/skshaper/BUILD.gn:9
Current value for target_cpu = "arm64": false
From //.gn:31
Overridden from the default: true
From //third_party/skia/BUILD.gn:37
Current value for target_cpu = "x64": false
From //.gn:31
Overridden from the default: false
From //third_party/skia/BUILD.gn:37
arguments to fx flash script
Current value (from the default): ""
From //build/images/BUILD.gn:39
Board name used for paving and amber updates.
Current value (from the default): ""
From //build/package.gni:21
Current value (from the default): false
From //garnet/bin/ui/scenic/BUILD.gn:13
Current value (from the default): false
From //garnet/bin/ui/scenic/BUILD.gn:11
Default Scudo options (before the SCUDO_OPTIONS environment variable is read at runtime). NOTE: This affects only components using the scudo variant (see GN build argument select_variant), and does not affect anything when the use_scudo build flag is set instead.
Current value (from the default): ["abort_on_error=1", "QuarantineSizeKb=0", "ThreadLocalQuarantineSizeKb=0", "DeallocationTypeMismatch=false", "DeleteSizeMismatch=false", "allocator_may_return_null=true"]
From //build/config/scudo/scudo.gni:17
Current value (from the default): ""
From //third_party/flutter/shell/version/version.gni:6
Current value (from the default): ["collection", "flutter", "meta", "typed_data", "vector_math"]
From //topaz/runtime/flutter_runner/prebuilt_framework.gni:8
Use link time optimization (LTO).
Current value (from the default): false
From //build/config/lto/config.gni:7
Using Vulkan on host (i.e. Linux) is an involved affair that involves downloading the Vulkan SDK, setting environment variables, and so forth... all things that are difficult to achieve in a CQ environment. Therefore, by default we use a stub implementation of Vulkan which fails to create a VkInstance. This allows everything to build, and also allows running Escher unit tests which don't require Vulkan.
Current value (from the default): true
From //garnet/public/lib/escher/BUILD.gn:16
Current value (from the default): "//garnet/drivers/gpu/msd-intel-gen"
From //garnet/lib/magma/gnbuild/magma.gni:10
Current value (from the default): ""
From //third_party/skia/BUILD.gn:40
Current value (from the default): true
From //third_party/skia/BUILD.gn:47
Current value (from the default): ""
From //build/images/BUILD.gn:45
Path to manifest file containing data to place into the initial /data partition.
Current value (from the default): ""
From //build/images/BUILD.gn:28
Enable all dart analysis
Current value (from the default): true
From //build/dart/dart_library.gni:15
Whether to build the netboot zbi by default.
You can still build //build/images:netboot explicitly even if enable_netboot is false.
Current value for target_cpu = "arm64": false
From //products/core.gni:7
Overridden from the default: false
From //build/images/BUILD.gn:33
Current value for target_cpu = "x64": false
From //products/core.gni:7
Overridden from the default: false
From //build/images/BUILD.gn:33
Current value (from the default): false
From //third_party/skia/BUILD.gn:46
Directory containing prebuilt Dart SDK. This must have in its bin/ subdirectory gen_snapshot.OS-CPU binaries. Set to empty for a local build.
Current value (from the default): "//topaz/tools/prebuilt-dart-sdk/linux-x64"
From //build/dart/dart.gni:9
Current value (from the default): true
From //third_party/skia/BUILD.gn:32
List of kernel images to include in the update (OTA) package. If no list is provided, all built kernels are included. The names in the list are strings that must match the filename to be included in the update package.
Current value (from the default): []
From //build/images/BUILD.gn:488
Current value (from the default): ""
From //build/images/BUILD.gn:44
If you add package labels to this variable, the packages will be included in the ‘base’ package set, which represents the set of packages that are part of an OTA. These pacakages are updated as an atomic unit during an OTA process and are immutable and are a superset of the TCB (Trusted Computing Base) for a product. These packages are never evicted by the system.
Current value for target_cpu = "arm64": ["//garnet/packages/config:kernel_crash_checker", "//garnet/packages/prod:crashpad_agent", "//garnet/packages/prod:feedback_agent", "//garnet/packages/prod:kernel_crash_checker", "//garnet/packages/products:base", "//bundles:kitchen_sink"]
From //root_build_dir/args.gn:3
Overridden from the default: []
From //BUILD.gn:14
Current value for target_cpu = "x64": ["//garnet/packages/config:kernel_crash_checker", "//garnet/packages/prod:crashpad_agent", "//garnet/packages/prod:feedback_agent", "//garnet/packages/prod:kernel_crash_checker", "//garnet/packages/products:base", "//bundles:kitchen_sink"]
From //root_build_dir/args.gn:3
Overridden from the default: []
From //BUILD.gn:14
Controls whether the compiler emits full stack frames for function calls. This reduces performance but increases the ability to generate good stack traces, especially when we have bugs around unwind table generation. It applies only for Fuchsia targets (see below where it is unset).
TODO(ZX-2361): Theoretically unwind tables should be good enough so we can remove this option when the issues are addressed.
Current value (from the default): true
From //build/config/BUILD.gn:19
This is the directory where host tools intended for manual use by developers get installed. It‘s something a developer might put into their shell’s $PATH. Host tools that are just needed as part of the build do not get copied here. This directory is only for things that are generally useful for testing or debugging or whatnot outside of the GN build itself. These are only installed by an explicit install_host_tools() rule (see //build/host.gni).
Current value (from the default): "//root_build_dir/tools"
From //build/host.gni:13
Current value (from the default): ""
From //src/ledger/bin/testing/sync_params.gni:6
Whether to include various features (non-shipping, insecure, etc.) in the kernel build.
Current value for target_cpu = "arm64": false
From //products/core.gni:9
Overridden from the default: false
From //build/config/fuchsia/zircon.gni:32
Current value for target_cpu = "x64": false
From //products/core.gni:9
Overridden from the default: false
From //build/config/fuchsia/zircon.gni:32
TODO(scottmg): https://crbug.com/crashpad/266 fuchsia:DX-690: BoringSSL was removed from the Fuchsia SDK. Re-enable it when we have a way to acquire a BoringSSL lib again.
Current value (from the default): true
From //third_party/crashpad/util/net/tls.gni:21
Whether libdart should export the symbols of the Dart API.
Current value (from the default): true
From //third_party/dart/runtime/runtime_args.gni:91
Current value (from the default): false
From //third_party/skia/BUILD.gn:26
Current value (from the default): ""
From //topaz/runtime/flutter_runner/prebuilt_framework.gni:6
Current value (from the default): ""
Whether the Dart binary version string should include the git hash and git commit time.
Current value (from the default): true
From //third_party/dart/runtime/runtime_args.gni:60
Path to Fuchsia Vulkan SDK
Current value (from the default): "//third_party/vulkan_loader_and_validation_layers"
From //build/vulkan/config.gni:10
Current value (from the default): ""
From //build/images/fvm.gni:48
Current value (from the default): false
From //third_party/skia/BUILD.gn:42
Current value (from the default): ""
Path to Clang lib directory.
Current value (from the default): "../build/buildtools/linux-x64/clang/lib"
From //build/images/manifest.gni:19
The default clang toolchain provided by the buildtools. This variable is additionally consumed by the Go toolchain.
Current value (from the default): "../buildtools/linux-x64/clang/bin"
From //build/config/clang/clang.gni:11
If non-empty, the given script will be invoked to produce a signed ZBI image. The given script must accept -z for the input zbi path, and -o for the output signed zbi path. The path must be in GN-label syntax (i.e. starts with //).
Current value (from the default): ""
From //build/images/custom_signing.gni:12
Current value (from the default): false
From //garnet/bin/guest/pkg/debian_guest/BUILD.gn:10
The directories to search for parts of the SDK.
By default, we search the public directories for the various layers. In the future, we'll search a pre-built SDK as well.
Current value (from the default): ["//garnet/public", "//peridot/public", "//topaz/public"]
From //build/config/fuchsia/sdk.gni:10
Whether to use the prebuilt Dart SDK for everything. When setting this to false, the preubilt Dart SDK will not be used in situations where the version of the SDK matters, but may still be used as an optimization where the version does not matter.
Current value (from the default): true
From //build/dart/dart.gni:15
This is a list of targets that will be built as mali vulkan ICDS.
Current value (from the default): []
From //garnet/lib/magma/gnbuild/magma.gni:38
Enable this to include fuchsia tracing capability
Current value (from the default): true
From //garnet/lib/magma/gnbuild/magma.gni:17
Current value (from the default): ""
From //third_party/skia/BUILD.gn:79
Zircon GN build arguments. This is included in the default value of zircon_args so you can set this to add things there without wiping out the defaults. When you set zircon_args directly, then this has no effect at all. Arguments you set here override any arguments in the default zircon_args. There is no way to append to a value from the defaults. Note that for just setting simple (string-only) values in Zircon GN‘s variants, the default zircon_args uses a variants value derived from select_variant so for simple cases there is no need to explicitly set Zircon’s variants here.
Current value (from the default): { }
From //build/config/fuchsia/zircon.gni:27
Whether the VM's platform dill file contains bytecode.
Current value (from the default): false
From //third_party/dart/runtime/runtime_args.gni:84
List of variants that will form the basis for variant toolchains. To make use of a variant, set select_variant.
Normally this is not set as a build argument, but it serves to document the available set of variants. See also universal_variants. Only set this to remove all the default variants here. To add more, set extra_variants instead.
Each element of the list is one variant, which is a scope defining:
configs (optional) [list of labels] Each label names a config that will be automatically used by every target built in this variant. For each config ${label}, there must also be a target ${label}_deps, which each target built in this variant will automatically depend on. The variant() template is the recommended way to define a config and its _deps target at the same time.
remove_common_configs (optional) remove_shared_configs (optional) [list of labels] This list will be removed (with -=) from the default_common_binary_configs list (or the default_shared_library_configs list, respectively) after all other defaults (and this variant's configs) have been added.
deps (optional) [list of labels] Added to the deps of every target linked in this variant (as well as the automatic ${label}_deps for each label in configs).
name (required if configs is omitted) [string] Name of the variant as used in select_variant elements' variant fields. It's a good idea to make it something concise and meaningful when seen as e.g. part of a directory name under $root_build_dir. If name is omitted, configs must be nonempty and the simple names (not the full label, just the part after all /s and :s) of these configs will be used in toolchain names (each prefixed by a “-”), so the list of config names forming each variant must be unique among the lists in known_variants + extra_variants.
toolchain_args (optional) [scope] Each variable defined in this scope overrides a build argument in the toolchain context of this variant.
host_only (optional) target_only (optional) [scope] This scope can contain any of the fields above. These values are used only for host or target, respectively. Any fields included here should not also be in the outer scope.
Current value (from the default):
[{
configs = ["//build/config/lto"]
}, {
configs = ["//build/config/lto:thinlto"]
}, {
configs = ["//build/config/profile"]
}, {
configs = ["//build/config/scudo"]
}, {
configs = ["//build/config/sanitizers:ubsan"]
}, {
configs = ["//build/config/sanitizers:ubsan", "//build/config/sanitizers:sancov"]
}, {
configs = ["//build/config/sanitizers:asan"]
host_only = {
remove_shared_configs = ["//build/config:symbol_no_undefined"]
}
toolchain_args = {
use_scudo = false
}
}, {
configs = ["//build/config/sanitizers:asan", "//build/config/sanitizers:sancov"]
host_only = {
remove_shared_configs = ["//build/config:symbol_no_undefined"]
}
toolchain_args = {
use_scudo = false
}
}, {
configs = ["//build/config/sanitizers:asan"]
host_only = {
remove_shared_configs = ["//build/config:symbol_no_undefined"]
}
name = "asan_no_detect_leaks"
toolchain_args = {
asan_default_options = "detect_leaks=0"
use_scudo = false
}
}, {
configs = ["//build/config/sanitizers:asan", "//build/config/sanitizers:fuzzer"]
host_only = {
remove_shared_configs = ["//build/config:symbol_no_undefined"]
}
remove_shared_configs = ["//build/config:symbol_no_undefined"]
toolchain_args = {
asan_default_options = "alloc_dealloc_mismatch=0"
use_scudo = false
}
}, {
configs = ["//build/config/sanitizers:ubsan", "//build/config/sanitizers:fuzzer"]
remove_shared_configs = ["//build/config:symbol_no_undefined"]
}]
From //build/config/BUILDCONFIG.gn:337
Set to true to enable compiling with ccache
Current value (from the default): false
From //build/toolchain/ccache.gni:9
Current value (from the default): ""
From //third_party/flutter/shell/version/version.gni:10
By default, the dynamic library target exposing the embedder API is only built for the host. The reasoning is that platforms that have target definitions would not need an embedder API because an embedder implementation is already provided for said target. This flag allows tbe builder to obtain a shared library exposing the embedder API for alternative embedder implementations.
Current value (from the default): false
From //third_party/flutter/shell/platform/embedder/embedder.gni:12
target_cpu = "arm64"The ARM variant-specific tuning mode. This will be a string like “armv6” or “cortex-a15”. An empty string means to use the default for the arm_version.
Current value (from the default): ""
From //build/config/arm.gni:25
Whether to use the neon FPU instruction set or not.
Current value (from the default): true
From //build/config/arm.gni:28
Current value (from the default): 8
From //build/config/arm.gni:12
Current value (from the default): false
From //garnet/drivers/video/amlogic-decoder/BUILD.gn:11
The ARM floating point mode. This is either the string “hard”, “soft”, or “softfp”. An empty string means to use the default one for the arm_version.
Current value (from the default): ""
From //build/config/arm.gni:20
Whether to enable optional NEON code paths.
Current value (from the default): false
From //build/config/arm.gni:31
target_cpu = "x64"Current value (from the default): false
From //garnet/drivers/gpu/msd-intel-gen/src/BUILD.gn:8