[gndoc] Update GN build arguments documentation
Test: CQ
Change-Id: I9e56cf1ed2bbbff965c2f977b76eec76109fad39
diff --git a/docs/gen/build_arguments.md b/docs/gen/build_arguments.md
index 92f0bdb..ef35289 100644
--- a/docs/gen/build_arguments.md
+++ b/docs/gen/build_arguments.md
@@ -2,68 +2,123 @@
## All builds
-### core_jit_cheat_target
-
-**Current value (from the default):** `""`
-
-From [//topaz/runtime/flutter_runner/kernel/BUILD.gn:27](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/flutter_runner/kernel/BUILD.gn#27)
-
-### shell_enable_vulkan
+### dart_use_tcmalloc
+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/flutter/shell/config.gni:6
+From //third_party/dart/runtime/runtime_args.gni:49
-### skia_enable_gpu
+### select_variant_shortcuts
+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`](#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:439](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#439)
+
+### skia_enable_effects_imagefilters
**Current value (from the default):** `true`
-From //third_party/skia/BUILD.gn:43
+From //third_party/skia/BUILD.gn:40
-### fvm_image_size
-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.
+### system_package_key
+The package key to use for signing Fuchsia packages made by the
+`package()` template (and the `system_image` packge). 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):** `""`
+**Current value (from the default):** `"//build/development.key"`
-From [//build/images/BUILD.gn:570](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#570)
+From [//build/package.gni:16](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/package.gni#16)
-### extra_variants
-Additional variant toolchain configs to support.
-This is just added to [`known_variants`](#known_variants).
+### zedboot_devmgr_config
+List of arguments to populate /boot/config/devmgr in the Zedboot image.
-**Current value (from the default):** `[]`
+**Current value (from the default):** `["netsvc.netboot=true"]`
-From [//build/config/BUILDCONFIG.gn:393](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#393)
+From [//build/images/zedboot/BUILD.gn:24](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/zedboot/BUILD.gn#24)
-### goma_dir
-Absolute directory containing the Goma source code.
+### zircon_build_abi_dir
+Zircon build directory for `target_cpu`, containing link-time `.so.abi`
+files that GN `deps` on [//zircon/public](https://fuchsia.googlesource.com/zircon/+/b9595a6fd78fab1905ef303d3316c187c2013c2f/public) libraries will link against.
+This should not be a sanitizer build.
-**Current value (from the default):** `"/home/swarming/goma"`
+**Current value (from the default):** `"//out/build-zircon/build-arm64"`
-From [//build/toolchain/goma.gni:12](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/goma.gni#12)
+From [//build/config/fuchsia/zircon.gni:14](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#14)
-### rustc_prefix
-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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/rust/config.gni#17)
-
-### skia_generate_workarounds
+### zircon_use_asan
+Set this if [`zircon_build_dir`](#zircon_build_dir) was built with
+`USE_ASAN=true`, e.g. `[//scripts/build-zircon.sh](https://fuchsia.googlesource.com/scripts/+/33a6ec008199a5431599c9dcb8ef1bbc1a376db3/build-zircon.sh) -A`. This mainly
+affects the defaults for [`zircon_build_dir`](#zircon_build_dir) and
+[`zircon_build_abi_dir`](#zircon_build_abi_dir). It also gets noticed
+by [//scripts/fx](https://fuchsia.googlesource.com/scripts/+/33a6ec008199a5431599c9dcb8ef1bbc1a376db3/fx) commands that rebuild Zircon so that they use `-A`
+again next time.
**Current value (from the default):** `false`
-From //third_party/skia/BUILD.gn:51
+From [//build/config/fuchsia/zircon.gni:40](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#40)
-### skia_llvm_path
+### scenic_enable_vulkan_validation
+Include the vulkan validation layers in scenic even in release builds
+TODO(SCN-1003): Set the default to false once we know why disabling
+validation layers causes a display swapchain setup issue.
-**Current value (from the default):** `""`
+**Current value (from the default):** `true`
-From //third_party/skia/BUILD.gn:57
+From [//garnet/bin/ui/BUILD.gn:12](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/ui/BUILD.gn#12)
+
+### scenic_ignore_vsync
+
+**Current value (from the default):** `false`
+
+From [//garnet/lib/ui/gfx/BUILD.gn:16](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/ui/gfx/BUILD.gn#16)
+
+### skia_use_fontconfig
+
+**Current value for `target_cpu = "arm64"`:** `false`
+
+From //.gn:31
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:22
+
+**Current value for `target_cpu = "x64"`:** `false`
+
+From //.gn:31
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:22
### skia_use_libjpeg_turbo
@@ -71,45 +126,15 @@
From //third_party/skia/BUILD.gn:25
-### dart_default_app
-Controls whether dart_app() targets generate JIT or AOT Dart snapshots.
-This defaults to JIT, use `fx set <ARCH> --args
-'dart_default_app="dart_aot_app"' to switch to AOT.
+### use_prebuilt_webkit
+Use a prebuilt WebKit binary rather than building it locally.
+See [//topaz/runtime/web_view/README.md](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/web_view/README.md) for details on the prebuilt.
+This is ignored when building WebKit-using components
+such as `web_view` in variant builds (e.g. sanitizers).
-**Current value (from the default):** `"dart_jit_app"`
+**Current value (from the default):** `true`
-From [//topaz/runtime/dart_runner/dart_app.gni:15](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/dart_runner/dart_app.gni#15)
-
-### host_byteorder
-
-**Current value (from the default):** `"undefined"`
-
-From [//build/config/host_byteorder.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/host_byteorder.gni#7)
-
-### host_tools_dir
-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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/host.gni)).
-
-**Current value (from the default):** `"//root_build_dir/tools"`
-
-From [//build/host.gni:13](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/host.gni#13)
-
-### skia_enable_tools
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:46
-
-### vk_loader_debug
-
-**Current value (from the default):** `"warn,error"`
-
-From [//third_party/vulkan_loader_and_validation_layers/loader/BUILD.gn:26](https://fuchsia.googlesource.com/third_party/vulkan_loader_and_validation_layers/+/3106666ca09bdab1a0f3c4c5d4d614bf4dab1f3d/loader/BUILD.gn#26)
+From [//topaz/runtime/web_view/config.gni:10](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/web_view/config.gni#10)
### zircon_asserts
@@ -117,178 +142,47 @@
From [//build/config/fuchsia/BUILD.gn:138](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/BUILD.gn#138)
-### dart_component_kind
-Allow for deduping the VM between standalone, flutter_runner and dart_runner.
+### dart_pool_depth
+Maximum number of Dart processes to run in parallel.
-**Current value (from the default):** `"shared_library"`
+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.
-From //third_party/dart/runtime/runtime_args.gni:76
+**Current value (from the default):** `16`
-### escher_use_null_vulkan_config_on_host
-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.
+From [//build/dart/toolchain.gni:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/dart/toolchain.gni#11)
-**Current value (from the default):** `true`
+### skia_use_libwebp
-From [//garnet/public/lib/escher/BUILD.gn:15](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/public/lib/escher/BUILD.gn#15)
+**Current value for `target_cpu = "arm64"`:** `false`
-### shell_dart_version
+From //.gn:32
-**Current value (from the default):** `""`
+**Overridden from the default:** `true`
-From //third_party/flutter/shell/version/version.gni:10
+From //third_party/skia/BUILD.gn:27
-### skia_enable_flutter_defines
+**Current value for `target_cpu = "x64"`:** `false`
-**Current value for `target_cpu = "arm64"`:** `true`
+From //.gn:32
-From //.gn:27
+**Overridden from the default:** `true`
-**Overridden from the default:** `false`
+From //third_party/skia/BUILD.gn:27
-From //third_party/skia/BUILD.gn:41
+### symbol_level
+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 for `target_cpu = "x64"`:** `true`
+**Current value (from the default):** `2`
-From //.gn:27
-
-**Overridden from the default:** `false`
-
-From //third_party/skia/BUILD.gn:41
-
-### skia_compile_processors
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:50
-
-### current_cpu
-
-**Current value (from the default):** `""`
-
-### enable_value_subsystem
-
-**Current value (from the default):** `false`
-
-From [//garnet/bin/ui/scenic/BUILD.gn:11](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/ui/scenic/BUILD.gn#11)
-
-### fuchsia_vulkan_sdk
-Path to Fuchsia Vulkan SDK
-
-**Current value (from the default):** `"//third_party/vulkan_loader_and_validation_layers"`
-
-From [//build/vulkan/config.gni:10](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/vulkan/config.gni#10)
-
-### magma_enable_developer_build
-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:19](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#19)
-
-### skia_use_lua
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:28
-
-### amlogic_decoder_tests
-
-**Current value (from the default):** `false`
-
-From [//garnet/drivers/video/amlogic-decoder/BUILD.gn:10](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/drivers/video/amlogic-decoder/BUILD.gn#10)
-
-### build_sdk_archives
-Whether to build SDK tarballs.
-
-**Current value (from the default):** `false`
-
-From [//build/sdk/sdk.gni:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/sdk/sdk.gni#11)
-
-### dart_lib_export_symbols
-Whether libdart should export the symbols of the Dart API.
-
-**Current value (from the default):** `true`
-
-From //third_party/dart/runtime/runtime_args.gni:89
-
-### fuchsia_packages
-List of packages (a GN list of strings).
-This list of packages is added to the set of "available" packages, see
-`products` for more information.
-
-**Current value for `target_cpu = "arm64"`:** `["topaz/packages/buildbot"]`
-
-From //root_build_dir/args.gn:2
-
-**Overridden from the default:** `[]`
-
-From [//build/gn/packages.gni:30](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#30)
-
-**Current value for `target_cpu = "x64"`:** `["topaz/packages/buildbot"]`
-
-From //root_build_dir/args.gn:2
-
-**Overridden from the default:** `[]`
-
-From [//build/gn/packages.gni:30](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#30)
-
-### thinlto_jobs
-Number of parallel ThinLTO jobs.
-
-**Current value (from the default):** `8`
-
-From [//build/config/lto/config.gni:13](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#13)
-
-### dart_core_snapshot_kind
-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:54
-
-### dart_debug
-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
-
-### shell_engine_version
-
-**Current value (from the default):** `""`
-
-From //third_party/flutter/shell/version/version.gni:6
-
-### skia_vulkan_header
-
-**Current value (from the default):** `""`
-
-From //third_party/skia/BUILD.gn:48
-
-### select_variant_canonical
-*This should never be set as a build argument.*
-It exists only to be set in `toolchain_args`.
-See [//build/toolchain/clang_toolchain.gni](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/clang_toolchain.gni) for details.
-
-**Current value (from the default):** `[]`
-
-From [//build/config/BUILDCONFIG.gn:618](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#618)
-
-### skia_enable_spirv_validation
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:45
+From [//build/config/compiler.gni:13](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/compiler.gni#13)
### zedboot_cmdline_files
Files containing additional kernel command line arguments to bake into
@@ -300,132 +194,121 @@
From [//build/images/zedboot/BUILD.gn:21](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/zedboot/BUILD.gn#21)
-### always_zedboot
-Build boot images that prefer Zedboot over local boot (only for EFI).
-
-**Current value (from the default):** `false`
-
-From [//build/images/BUILD.gn:580](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#580)
-
-### amber_keys_dir
-Directory containing signing keys used by amber-publish.
-
-**Current value (from the default):** `"//garnet/go/src/amber/keys"`
-
-From [//garnet/go/src/amber/amber.gni:14](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/go/src/amber/amber.gni#14)
-
-### rust_toolchain_triple_suffix
-Sets the fuchsia toolchain target triple suffix (after arch)
-
-**Current value (from the default):** `"fuchsia"`
-
-From [//build/rust/config.gni:23](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/rust/config.gni#23)
-
-### scenic_vulkan_swapchain
-
-**Current value (from the default):** `1`
-
-From [//garnet/lib/ui/gfx/BUILD.gn:12](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/ui/gfx/BUILD.gn#12)
-
-### dart_custom_version_for_pub
-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:71
-
-### exclude_kernel_service
-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:86
-
-### skia_enable_effects
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:39
-
-### use_prebuilt_dart_sdk
-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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/dart/dart.gni#15)
-
-### update_kernels
-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.
+### kernel_cmdline_args
+List of kernel command line arguments to bake into the boot image.
+See also [//zircon/docs/kernel_cmdline.md](https://fuchsia.googlesource.com/zircon/+/b9595a6fd78fab1905ef303d3316c187c2013c2f/docs/kernel_cmdline.md) and
+[`devmgr_config`](#devmgr_config).
**Current value (from the default):** `[]`
-From [//build/images/BUILD.gn:363](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#363)
+From [//build/images/BUILD.gn:345](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#345)
-### zircon_build_root
-
-**Current value (from the default):** `"//zircon"`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:10](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#10)
-
-### enable_gfx_subsystem
-
-**Current value (from the default):** `true`
-
-From [//garnet/bin/ui/scenic/BUILD.gn:12](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/ui/scenic/BUILD.gn#12)
-
-### flutter_default_app
-
-**Current value (from the default):** `"flutter_jit_app"`
-
-From [//topaz/runtime/flutter_runner/flutter_app.gni:15](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/flutter_runner/flutter_app.gni#15)
-
-### ledger_sync_credentials_file
-
-**Current value (from the default):** `""`
-
-From [//peridot/bin/ledger/testing/sync_params.gni:6](https://fuchsia.googlesource.com/peridot/+/d548cf94e499f91eb325539394b22f8ae061aa41/bin/ledger/testing/sync_params.gni#6)
-
-### magma_enable_tracing
-Enable this to include fuchsia tracing capability
-
-**Current value (from the default):** `true`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:15](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#15)
-
-### skia_enable_fontmgr_empty
+### dart_debug
+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/skia/BUILD.gn:42
+From //third_party/dart/runtime/runtime_args.gni:9
-### skia_skqp_global_error_tolerance
+### select_variant
+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.
-**Current value (from the default):** `0`
+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.
-From //third_party/skia/BUILD.gn:55
+A string selector can match a name in
+[`select_variant_shortcuts`](#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`](#known_variants) and
+[`universal_variants`](#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 }`.
-### skia_use_libpng
+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.
-**Current value (from the default):** `true`
+The scope that forms a full selector defines some of these:
-From //third_party/skia/BUILD.gn:26
+ 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:613](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#613)
+
+### shell_skia_version
+
+**Current value (from the default):** `""`
+
+From //third_party/flutter/shell/version/version.gni:8
+
+### use_ccache
+Set to true to enable compiling with ccache
+
+**Current value (from the default):** `false`
+
+From [//build/toolchain/ccache.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/ccache.gni#9)
+
+### target_cpu
+
+**Current value for `target_cpu = "arm64"`:** `"arm64"`
+
+From //root_build_dir/args.gn:1
+
+**Overridden from the default:** `""`
+
+**Current value for `target_cpu = "x64"`:** `"x64"`
+
+From //root_build_dir/args.gn:1
+
+**Overridden from the default:** `""`
### toolchain_variant
*This should never be set as a build argument.*
@@ -463,12 +346,485 @@
From [//build/config/BUILDCONFIG.gn:71](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#71)
-### use_lto
-Use link time optimization (LTO).
+### create_kernel_service_snapshot
**Current value (from the default):** `false`
-From [//build/config/lto/config.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#7)
+From //third_party/dart/runtime/runtime_args.gni:99
+
+### dart_zlib_path
+The BUILD.gn file that we pull from chromium as part of zlib has a
+dependence on //base, which we don't pull in. In a standalone build of the
+VM, we set this to //runtime/bin/zlib where we have a BUILD.gn file without
+a dependence on //base.
+
+**Current value (from the default):** `"//third_party/zlib"`
+
+From //third_party/dart/runtime/runtime_args.gni:45
+
+### data_image_size
+The size of the minfs data partition image to create. Normally this image
+is added to FVM, and can therefore expand as needed. It must be at least
+10mb (the default) in order to be succesfully initialized.
+
+**Current value (from the default):** `"10m"`
+
+From [//build/images/BUILD.gn:564](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#564)
+
+### skia_enable_gpu
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:43
+
+### skia_llvm_path
+
+**Current value (from the default):** `""`
+
+From //third_party/skia/BUILD.gn:57
+
+### skia_use_angle
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:19
+
+### enable_frame_pointers
+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:16](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILD.gn#16)
+
+### shell_dart_version
+
+**Current value (from the default):** `""`
+
+From //third_party/flutter/shell/version/version.gni:10
+
+### skia_use_zlib
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:31
+
+### current_os
+
+**Current value (from the default):** `""`
+
+### enable_sketchy_subsystem
+
+**Current value (from the default):** `true`
+
+From [//garnet/bin/ui/scenic/BUILD.gn:13](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/ui/scenic/BUILD.gn#13)
+
+### target_os
+
+**Current value (from the default):** `""`
+
+### skia_use_freetype
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:23
+
+### skia_use_metal
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:32
+
+### bootfs_extra
+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:357](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#357)
+
+### build_libvulkan
+This is a list of targets that will be built as vulkan ICDS. If more than one
+target is given then use_vulkan_loader_for_tests must be set to true, as
+otherwise tests won't know which libvulkan to use.
+
+**Current value (from the default):** `[]`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:38](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#38)
+
+### dart_platform_bytecode
+Whether the VM's platform dill file contains bytecode.
+
+**Current value (from the default):** `false`
+
+From //third_party/dart/runtime/runtime_args.gni:82
+
+### dart_use_fallback_root_certificates
+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:39
+
+### rust_toolchain_triple_suffix
+Sets the fuchsia toolchain target triple suffix (after arch)
+
+**Current value (from the default):** `"fuchsia"`
+
+From [//build/rust/config.gni:23](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/rust/config.gni#23)
+
+### scenic_use_views2
+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](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/ui/scenic/config.gni#7)
+
+### zircon_boot_manifests
+Manifest files describing files to go into the `/boot` filesystem.
+Can be either // source paths or absolute system paths.
+`zircon_boot_groups` controls which files are actually selected.
+
+Since Zircon manifest files are relative to a Zircon source directory
+rather than to the directory containing the manifest, these are assumed
+to reside in a build directory that's a direct subdirectory of the
+Zircon source directory and thus their contents can be taken as
+relative to `get_path_info(entry, "dir") + "/.."`.
+
+**Current value (from the default):** `["//out/build-zircon/build-arm64/bootfs.manifest"]`
+
+From [//build/images/manifest.gni:44](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#44)
+
+### zircon_system_groups
+Groups to include from the Zircon /boot manifest into /system
+(instead of into /boot like Zircon's own bootdata.bin does).
+Should not include any groups that are also in zircon_boot_groups,
+which see. If zircon_boot_groups is "all" then this should be "".
+**TODO(mcgrathr)**: _Could default to "" for `!is_debug`, or "production
+build". Note including `"test"` here places all of Zircon's tests into
+`/system/test`, which means that Fuchsia bots run those tests too._
+
+**Current value (from the default):** `"misc,test"`
+
+From [//build/images/BUILD.gn:36](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#36)
+
+### clang_prefix
+
+**Current value (from the default):** `"../buildtools/linux-x64/clang/bin"`
+
+From [//build/config/clang/clang.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/clang/clang.gni#9)
+
+### enable_crashpad
+When this is set, Crashpad will be used to handle exceptions (which uploads
+crashes to the crash server), rather than crashanalyzer in Zircon (which
+prints the crash log to the the system log).
+
+**Current value (from the default):** `false`
+
+From [//build/images/crashpad.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/crashpad.gni#9)
+
+### magma_python_path
+
+**Current value (from the default):** `"/b/s/w/ir/kitchen-workdir/third_party/mako"`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:12](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#12)
+
+### skia_qt_path
+
+**Current value (from the default):** `""`
+
+From //third_party/skia/BUILD.gn:49
+
+### skia_use_sfntly
+
+**Current value for `target_cpu = "arm64"`:** `false`
+
+From //.gn:33
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:64
+
+**Current value for `target_cpu = "x64"`:** `false`
+
+From //.gn:33
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:64
+
+### skia_enable_tools
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:46
+
+### skia_generate_workarounds
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:51
+
+### select_variant_canonical
+*This should never be set as a build argument.*
+It exists only to be set in `toolchain_args`.
+See [//build/toolchain/clang_toolchain.gni](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/clang_toolchain.gni) for details.
+
+**Current value (from the default):** `[]`
+
+From [//build/config/BUILDCONFIG.gn:618](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#618)
+
+### use_thinlto
+Use ThinLTO variant of LTO if use_lto = true.
+
+**Current value (from the default):** `true`
+
+From [//build/config/lto/config.gni:10](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#10)
+
+### build_intel_gen
+
+**Current value (from the default):** `false`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:23](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#23)
+
+### build_msd_arm_mali
+
+**Current value (from the default):** `true`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:21](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#21)
+
+### dart_snapshot_kind
+
+**Current value (from the default):** `"kernel"`
+
+From //third_party/dart/utils/application_snapshot.gni:14
+
+### dart_target_arch
+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
+
+### exclude_kernel_service
+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:86
+
+### kernel_cmdline_files
+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`](#kernel_cmdline_args).
+These can be GN `//` source pathnames or absolute system pathnames.
+
+**Current value (from the default):** `[]`
+
+From [//build/images/BUILD.gn:351](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#351)
+
+### zircon_build_dir
+Zircon build directory for `target_cpu`, containing `.manifest` and
+`.zbi` files for Zircon's BOOTFS and kernel. This provides the kernel
+and Zircon components used in the boot image. It also provides the
+Zircon shared libraries used at runtime in Fuchsia packages.
+
+If left `""` (the default), then this is computed from
+[`zircon_build_abi_dir`](#zircon_build_abi_dir) and
+[`zircon_use_asan`](#zircon_use_asan).
+
+**Current value (from the default):** `""`
+
+From [//build/config/fuchsia/zircon.gni:24](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#24)
+
+### armadillo_path_context_config
+
+**Current value (from the default):** `"../bin/user_shell/armadillo_user_shell/assets/contextual_config.json"`
+
+From [//topaz/shell/BUILD.gn:14](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/shell/BUILD.gn#14)
+
+### build_sdk_archives
+Whether to build SDK tarballs.
+
+**Current value (from the default):** `false`
+
+From [//build/sdk/sdk.gni:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/sdk/sdk.gni#11)
+
+### escher_use_null_vulkan_config_on_host
+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:15](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/public/lib/escher/BUILD.gn#15)
+
+### thinlto_jobs
+Number of parallel ThinLTO jobs.
+
+**Current value (from the default):** `8`
+
+From [//build/config/lto/config.gni:13](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#13)
+
+### zedboot_cmdline_args
+List of kernel command line arguments to bake into the Zedboot image.
+See [//zircon/docs/kernel_cmdline.md](https://fuchsia.googlesource.com/zircon/+/b9595a6fd78fab1905ef303d3316c187c2013c2f/docs/kernel_cmdline.md) and
+[`zedboot_devmgr_config`](#zedboot_devmgr_config).
+
+**Current value (from the default):** `[]`
+
+From [//build/images/zedboot/BUILD.gn:15](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/zedboot/BUILD.gn#15)
+
+### flutter_profile
+
+**Current value (from the default):** `true`
+
+From [//topaz/runtime/flutter_runner/flutter_app.gni:33](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/flutter_runner/flutter_app.gni#33)
+
+### flutter_runtime_mode
+The runtime mode ("debug", "profile", "release", "dynamic_profile", or "dynamic_release")
+
+**Current value (from the default):** `"debug"`
+
+From //third_party/flutter/common/config.gni:18
+
+### magma_enable_developer_build
+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:19](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#19)
+
+### target_sysroot
+The absolute path of the sysroot that is used with the target toolchain.
+
+**Current value (from the default):** `""`
+
+From [//build/config/sysroot.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/sysroot.gni#7)
+
+### amber_keys_dir
+Directory containing signing keys used by amber-publish.
+
+**Current value (from the default):** `"//garnet/go/src/amber/keys"`
+
+From [//garnet/go/src/amber/amber.gni:14](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/go/src/amber/amber.gni#14)
+
+### custom_signing_script
+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:10](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/custom_signing.gni#10)
+
+### dart_version_git_info
+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:58
+
+### skia_android_serial
+
+**Current value (from the default):** `""`
+
+From //third_party/skia/BUILD.gn:36
+
+### zircon_asan_build_dir
+Zircon `USE_ASAN=true` build directory for `target_cpu` containing
+`bootfs.manifest` with libraries and `devhost.asan`.
+
+If left `""` (the default), then this is computed from
+[`zircon_build_dir`](#zircon_build_dir) and
+[`zircon_use_asan`](#zircon_use_asan).
+
+**Current value (from the default):** `""`
+
+From [//build/config/fuchsia/zircon.gni:32](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#32)
+
+### amber_repository_dir
+Directory containing files named by their merkleroot content IDs in
+ASCII hex. The [//build/image](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/image):amber_publish_blobs target populates
+this with copies of build products, but never removes old files.
+
+**Current value (from the default):** `"//root_build_dir/amber-files"`
+
+From [//garnet/go/src/amber/amber.gni:11](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/go/src/amber/amber.gni#11)
+
+### dart_core_snapshot_kind
+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:54
+
+### skia_enable_discrete_gpu
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:38
+
+### prebuilt_libvulkan_arm_path
+
+**Current value (from the default):** `""`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:25](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#25)
+
+### skia_enable_atlas_text
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:65
+
+### dart_custom_version_for_pub
+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:71
+
+### enable_value_subsystem
+
+**Current value (from the default):** `false`
+
+From [//garnet/bin/ui/scenic/BUILD.gn:11](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/ui/scenic/BUILD.gn#11)
+
+### extra_variants
+Additional variant toolchain configs to support.
+This is just added to [`known_variants`](#known_variants).
+
+**Current value (from the default):** `[]`
+
+From [//build/config/BUILDCONFIG.gn:393](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#393)
### fuchsia_products
List of product definition files describing the packages to build, and
@@ -495,60 +851,101 @@
From [//build/gn/packages.gni:25](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#25)
-### skia_use_egl
+### host_tools_dir
+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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/host.gni)).
-**Current value (from the default):** `false`
+**Current value (from the default):** `"//root_build_dir/tools"`
-From //third_party/skia/BUILD.gn:20
+From [//build/host.gni:13](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/host.gni#13)
-### target_cpu
-
-**Current value for `target_cpu = "arm64"`:** `"arm64"`
-
-From //root_build_dir/args.gn:1
-
-**Overridden from the default:** `""`
-
-**Current value for `target_cpu = "x64"`:** `"x64"`
-
-From //root_build_dir/args.gn:1
-
-**Overridden from the default:** `""`
-
-### build_msd_arm_mali
+### magma_enable_tracing
+Enable this to include fuchsia tracing capability
**Current value (from the default):** `true`
-From [//garnet/lib/magma/gnbuild/magma.gni:21](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#21)
+From [//garnet/lib/magma/gnbuild/magma.gni:15](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#15)
-### current_os
+### skia_use_piex
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:30
+
+### update_kernels
+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:363](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#363)
+
+### dart_debug_optimization_level
+The optimization level to use for debug builds.
+
+**Current value (from the default):** `"2"`
+
+From //third_party/dart/runtime/runtime_args.gni:35
+
+### skia_enable_flutter_defines
+
+**Current value for `target_cpu = "arm64"`:** `true`
+
+From //.gn:27
+
+**Overridden from the default:** `false`
+
+From //third_party/skia/BUILD.gn:41
+
+**Current value for `target_cpu = "x64"`:** `true`
+
+From //.gn:27
+
+**Overridden from the default:** `false`
+
+From //third_party/skia/BUILD.gn:41
+
+### synthesize_packages
+List of extra packages to synthesize on the fly. This is only for
+things that do not appear normally in the source tree. Synthesized
+packages can contain build artifacts only if they already exist in some
+part of the build. They can contain arbitrary verbatim files.
+Synthesized packages can't express dependencies on other packages.
+
+Each element of this list is a scope that is very much like the body of
+a package() template invocation (see [//build/package.gni](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/package.gni)). That scope
+must set `name` to the string naming the package, as would be the name
+in the package() target written in a GN file. This must be unique
+among all package names.
+
+**Current value (from the default):** `[]`
+
+From [//build/gn/packages.gni:43](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#43)
+
+### core_jit_cheat_trace
**Current value (from the default):** `""`
-### enable_frame_pointers
-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).
+From [//topaz/runtime/flutter_runner/kernel/BUILD.gn:28](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/flutter_runner/kernel/BUILD.gn#28)
-TODO(ZX-2361): Theoretically unwind tables should be good enough so we can
-remove this option when the issues are addressed.
+### host_byteorder
-**Current value (from the default):** `true`
+**Current value (from the default):** `"undefined"`
-From [//build/config/BUILD.gn:16](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILD.gn#16)
+From [//build/config/host_byteorder.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/host_byteorder.gni#7)
-### expat_build_root
+### skia_tools_require_resources
-**Current value (from the default):** `"//third_party/expat"`
+**Current value (from the default):** `false`
-From [//garnet/lib/magma/gnbuild/magma.gni:7](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#7)
-
-### magma_build_root
-
-**Current value (from the default):** `"//garnet/lib/magma"`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:6](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#6)
+From //third_party/skia/BUILD.gn:60
### skia_use_dng_sdk
@@ -556,7 +953,7 @@
From //.gn:29
-**Overridden from the default:** `false`
+**Overridden from the default:** `true`
From //third_party/skia/BUILD.gn:63
@@ -568,37 +965,668 @@
From //third_party/skia/BUILD.gn:63
-### system_package_key
-The package key to use for signing Fuchsia packages made by the
-`package()` template (and the `system_image` packge). 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.
+### use_prebuilt_dart_sdk
+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):** `"//build/development.key"`
+**Current value (from the default):** `true`
-From [//build/package.gni:16](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/package.gni#16)
+From [//build/dart/dart.gni:15](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/dart/dart.gni#15)
-### dart_use_tcmalloc
-Whether to link the standalone VM against tcmalloc. The standalone build of
-the VM enables this only for Linux builds.
+### zircon_tools_dir
+Where to find Zircon's host-side tools that are run as part of the build.
+
+**Current value (from the default):** `"//out/build-zircon/tools"`
+
+From [//build/config/fuchsia/zircon.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#9)
+
+### universal_variants
+
+**Current value (from the default):**
+```
+[{
+ configs = []
+ name = "release"
+ toolchain_args = {
+ is_debug = false
+}
+}]
+```
+
+From [//build/config/BUILDCONFIG.gn:413](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#413)
+
+### use_scudo
+Enable the [Scudo](https://llvm.org/docs/ScudoHardenedAllocator.html)
+memory allocator.
+
+**Current value (from the default):** `true`
+
+From [//build/config/scudo/scudo.gni:8](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/scudo/scudo.gni#8)
+
+### cloudkms_key_dir
+
+**Current value (from the default):** `"projects/fuchsia-infra/locations/global/keyRings/test-secrets/cryptoKeys"`
+
+From [//build/testing/secret_spec.gni:8](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/testing/secret_spec.gni#8)
+
+### core_jit_cheat_target
+
+**Current value (from the default):** `""`
+
+From [//topaz/runtime/flutter_runner/kernel/BUILD.gn:27](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/flutter_runner/kernel/BUILD.gn#27)
+
+### current_cpu
+
+**Current value (from the default):** `""`
+
+### flutter_default_app
+
+**Current value (from the default):** `"flutter_jit_app"`
+
+From [//topaz/runtime/flutter_runner/flutter_app.gni:15](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/flutter_runner/flutter_app.gni#15)
+
+### fvm_image_size
+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/BUILD.gn:570](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#570)
+
+### skia_use_expat
+
+**Current value for `target_cpu = "arm64"`:** `false`
+
+From //.gn:30
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:21
+
+**Current value for `target_cpu = "x64"`:** `false`
+
+From //.gn:30
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:21
+
+### always_zedboot
+Build boot images that prefer Zedboot over local boot (only for EFI).
**Current value (from the default):** `false`
-From //third_party/dart/runtime/runtime_args.gni:49
+From [//build/images/BUILD.gn:580](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#580)
-### dart_version_git_info
-Whether the Dart binary version string should include the git hash and
-git commit time.
+### flutter_aot
+Enable ahead-of-time compilation on platforms where AOT is optional.
+
+**Current value (from the default):** `false`
+
+From //third_party/flutter/common/config.gni:15
+
+### fuchsia_packages
+List of packages (a GN list of strings).
+This list of packages is added to the set of "available" packages, see
+`products` for more information.
+
+**Current value for `target_cpu = "arm64"`:** `["topaz/packages/buildbot"]`
+
+From //root_build_dir/args.gn:2
+
+**Overridden from the default:** `[]`
+
+From [//build/gn/packages.gni:30](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#30)
+
+**Current value for `target_cpu = "x64"`:** `["topaz/packages/buildbot"]`
+
+From //root_build_dir/args.gn:2
+
+**Overridden from the default:** `[]`
+
+From [//build/gn/packages.gni:30](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#30)
+
+### host_cpu
+
+**Current value (from the default):** `"x64"`
+
+### skia_lex
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:52
+
+### thinlto_cache_dir
+ThinLTO cache directory path.
+
+**Current value (from the default):** `"host_x64/thinlto-cache"`
+
+From [//build/config/lto/config.gni:16](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#16)
+
+### dart_runtime_mode
+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
+
+### enable_gfx_subsystem
**Current value (from the default):** `true`
-From //third_party/dart/runtime/runtime_args.gni:58
+From [//garnet/bin/ui/scenic/BUILD.gn:12](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/ui/scenic/BUILD.gn#12)
-### enable_sketchy_subsystem
+### prebuilt_dart_sdk
+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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/dart/dart.gni#9)
+
+### rustc_prefix
+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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/rust/config.gni#17)
+
+### skia_enable_ccpr
**Current value (from the default):** `true`
-From [//garnet/bin/ui/scenic/BUILD.gn:13](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/ui/scenic/BUILD.gn#13)
+From //third_party/skia/BUILD.gn:37
+
+### use_lto
+Use link time optimization (LTO).
+
+**Current value (from the default):** `false`
+
+From [//build/config/lto/config.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#7)
+
+### skia_enable_vulkan_debug_layers
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:47
+
+### use_goma
+Set to true to enable distributed compilation using Goma.
+
+**Current value (from the default):** `false`
+
+From [//build/toolchain/goma.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/goma.gni#9)
+
+### amlogic_decoder_tests
+
+**Current value (from the default):** `false`
+
+From [//garnet/drivers/video/amlogic-decoder/BUILD.gn:10](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/drivers/video/amlogic-decoder/BUILD.gn#10)
+
+### dart_lib_export_symbols
+Whether libdart should export the symbols of the Dart API.
+
+**Current value (from the default):** `true`
+
+From //third_party/dart/runtime/runtime_args.gni:89
+
+### fuchsia_use_vulkan
+Consolidated build toggle for use of Vulkan across Fuchsia
+
+**Current value (from the default):** `true`
+
+From [//build/vulkan/config.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/vulkan/config.gni#7)
+
+### host_os
+
+**Current value (from the default):** `"linux"`
+
+### scenic_vulkan_swapchain
+
+**Current value (from the default):** `1`
+
+From [//garnet/lib/ui/gfx/BUILD.gn:12](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/ui/gfx/BUILD.gn#12)
+
+### scudo_default_options
+Default [Scudo](https://llvm.org/docs/ScudoHardenedAllocator.html)
+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:15](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/scudo/scudo.gni#15)
+
+### zircon_aux_manifests
+
+**Current value (from the default):** `["//out/build-zircon/build-arm64-asan/bootfs.manifest"]`
+
+From [//build/images/manifest.gni:32](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#32)
+
+### zircon_boot_groups
+Groups to include from the Zircon /boot manifest into /boot.
+This is either "all" or a comma-separated list of one or more of:
+ core -- necessary to boot
+ misc -- utilities in /bin
+ test -- test binaries in /bin and /test
+
+**Current value (from the default):** `"core"`
+
+From [//build/images/BUILD.gn:25](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#25)
+
+### crashpad_use_boringssl_for_http_transport_socket
+
+**Current value (from the default):** `true`
+
+From [//third_party/crashpad/util/net/tls.gni:18](https://chromium.googlesource.com/crashpad/crashpad/+/7682f0f6ebbd5ea90f29c8b5c3cad076eb9f3fb3/util/net/tls.gni#18)
+
+### skia_use_icu
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:24
+
+### use_vulkan_loader_for_tests
+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:33](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#33)
+
+### dart_default_app
+Controls whether dart_app() targets generate JIT or AOT Dart snapshots.
+This defaults to JIT, use `fx set <ARCH> --args
+'dart_default_app="dart_aot_app"' to switch to AOT.
+
+**Current value (from the default):** `"dart_jit_app"`
+
+From [//topaz/runtime/dart_runner/dart_app.gni:15](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/dart_runner/dart_app.gni#15)
+
+### expat_build_root
+
+**Current value (from the default):** `"//third_party/expat"`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:7](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#7)
+
+### fuchsia_vulkan_sdk
+Path to Fuchsia Vulkan SDK
+
+**Current value (from the default):** `"//third_party/vulkan_loader_and_validation_layers"`
+
+From [//build/vulkan/config.gni:10](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/vulkan/config.gni#10)
+
+### rust_lto
+Sets the default LTO type for rustc bulids.
+
+**Current value (from the default):** `"unset"`
+
+From [//build/rust/config.gni:20](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/rust/config.gni#20)
+
+### skia_vulkan_header
+
+**Current value (from the default):** `""`
+
+From //third_party/skia/BUILD.gn:48
+
+### toolchain_manifests
+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/kitchen-workdir/buildtools/linux-x64/clang/lib/aarch64-fuchsia.manifest"]`
+
+From [//build/images/manifest.gni:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#11)
+
+### dart_force_product
+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](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/dart/config.gni#10)
+
+### extra_manifest_args
+Extra args to globally apply to the manifest generation script.
+
+**Current value (from the default):** `[]`
+
+From [//build/images/manifest.gni:47](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#47)
+
+### flutter_aot_sharing_basis
+Armadillo is not AOT compiled in debug builds
+
+**Current value (from the default):** `""`
+
+From [//topaz/runtime/flutter_runner/flutter_app.gni:25](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/flutter_runner/flutter_app.gni#25)
+
+### magma_build_root
+
+**Current value (from the default):** `"//garnet/lib/magma"`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:6](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#6)
+
+### shell_enable_vulkan
+
+**Current value (from the default):** `false`
+
+From //third_party/flutter/shell/config.gni:6
+
+### crashpad_dependencies
+Determines various flavors of build configuration, and which concrete
+targets to use for dependencies. Valid values are "standalone",
+"chromium", and "fuchsia". Defaulted to "fuchsia" because
+"is_fuchsia_tree" is set.
+
+**Current value (from the default):** `"fuchsia"`
+
+From [//third_party/crashpad/build/crashpad_buildconfig.gni:26](https://chromium.googlesource.com/crashpad/crashpad/+/7682f0f6ebbd5ea90f29c8b5c3cad076eb9f3fb3/build/crashpad_buildconfig.gni#26)
+
+### ledger_sync_credentials_file
+
+**Current value (from the default):** `""`
+
+From [//peridot/bin/ledger/testing/sync_params.gni:6](https://fuchsia.googlesource.com/peridot/+/a2b742055975e6b5813a9dde8a3ca669ab78c952/bin/ledger/testing/sync_params.gni#6)
+
+### shell_engine_version
+
+**Current value (from the default):** `""`
+
+From //third_party/flutter/shell/version/version.gni:6
+
+### skia_enable_fontmgr_empty
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:42
+
+### skia_enable_pdf
+
+**Current value for `target_cpu = "arm64"`:** `false`
+
+From //.gn:28
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:44
+
+**Current value for `target_cpu = "x64"`:** `false`
+
+From //.gn:28
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:44
+
+### skia_use_egl
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:20
+
+### skia_use_vulkan
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:72
+
+### skia_use_x11
+
+**Current value for `target_cpu = "arm64"`:** `false`
+
+From //.gn:34
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:34
+
+**Current value for `target_cpu = "x64"`:** `false`
+
+From //.gn:34
+
+**Overridden from the default:** `true`
+
+From //third_party/skia/BUILD.gn:34
+
+### dart_aot_sharing_basis
+module_suggester is not AOT compiled in debug builds
+
+**Current value (from the default):** `""`
+
+From [//topaz/runtime/dart_runner/dart_app.gni:25](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/dart_runner/dart_app.gni#25)
+
+### extra_authorized_keys_file
+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](https://fuchsia.googlesource.com/third_party/openssh-portable/+/961fd14159e8bde1185388dcf4bb240a7fa49841/fuchsia/developer-keys/BUILD.gn#11)
+
+### glm_build_root
+
+**Current value (from the default):** `"//third_party/glm"`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:9](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#9)
+
+### goma_dir
+Absolute directory containing the Goma source code.
+
+**Current value (from the default):** `"/home/swarming/goma"`
+
+From [//build/toolchain/goma.gni:12](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/goma.gni#12)
+
+### icu_use_data_file
+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](https://fuchsia.googlesource.com/third_party/icu/+/15006476e9d2f5c7d6691f3658fecff4929aaf68/config.gni#15)
+
+### skia_use_libheif
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:33
+
+### zircon_build_root
+
+**Current value (from the default):** `"//zircon"`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:10](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#10)
+
+### build_vsl_gc
+
+**Current value (from the default):** `true`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:22](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#22)
+
+### devmgr_config
+List of arguments to add to /boot/config/devmgr.
+These come after synthesized arguments to configure blobfs and pkgfs,
+and the one generated for [`enable_crashpad`](#enable_crashpad).
+
+**Current value (from the default):** `[]`
+
+From [//build/images/BUILD.gn:340](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#340)
+
+### skia_skqp_global_error_tolerance
+
+**Current value (from the default):** `0`
+
+From //third_party/skia/BUILD.gn:55
+
+### skia_use_libpng
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:26
+
+### use_prebuilt_ffmpeg
+Use a prebuilt ffmpeg binary rather than building it locally. See
+[//garnet/bin/mediaplayer/ffmpeg/README.md](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/mediaplayer/ffmpeg/README.md) for details. This is
+ignored when building media_player in variant builds (e.g. sanitizers);
+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 because media_player is a variant build) then //third_party/ffmpeg
+must be in the source tree, which requires:
+`jiri import -name garnet manifest/ffmpeg https://fuchsia.googlesource.com/garnet`
+
+**Current value (from the default):** `true`
+
+From [//garnet/bin/mediaplayer/ffmpeg/BUILD.gn:14](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/mediaplayer/ffmpeg/BUILD.gn#14)
+
+### vk_loader_debug
+
+**Current value (from the default):** `"warn,error"`
+
+From [//third_party/vulkan_loader_and_validation_layers/loader/BUILD.gn:26](https://fuchsia.googlesource.com/third_party/vulkan_loader_and_validation_layers/+/3106666ca09bdab1a0f3c4c5d4d614bf4dab1f3d/loader/BUILD.gn#26)
+
+### skia_skqp_enable_driver_correctness_workarounds
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:54
+
+### skia_use_lua
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:28
+
+### amber_repository_blobs_dir
+
+**Current value (from the default):** `"//root_build_dir/amber-files/repository/blobs"`
+
+From [//garnet/go/src/amber/amber.gni:16](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/go/src/amber/amber.gni#16)
+
+### dart_component_kind
+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:76
+
+### fvm_slice_size
+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/BUILD.gn:577](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#577)
+
+### skia_compile_processors
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:50
+
+### skia_enable_effects
+
+**Current value (from the default):** `true`
+
+From //third_party/skia/BUILD.gn:39
+
+### skia_enable_spirv_validation
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:45
+
+### skia_use_opencl
+
+**Current value (from the default):** `false`
+
+From //third_party/skia/BUILD.gn:29
+
+### enable_input_subsystem
+
+**Current value (from the default):** `true`
+
+From [//garnet/bin/ui/scenic/BUILD.gn:14](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/bin/ui/scenic/BUILD.gn#14)
+
+### is_debug
+Debug build.
+
+**Current value (from the default):** `true`
+
+From [//build/config/BUILDCONFIG.gn:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#11)
+
+### msd_intel_gen_build_root
+
+**Current value (from the default):** `"//garnet/drivers/gpu/msd-intel-gen"`
+
+From [//garnet/lib/magma/gnbuild/magma.gni:8](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#8)
+
+### sdk_dirs
+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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/sdk.gni#10)
+
+### skia_llvm_lib
+
+**Current value (from the default):** `"LLVM"`
+
+From //third_party/skia/BUILD.gn:58
+
+### embedder_for_target
+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
+
+### experimental_web_entity_extraction
+
+**Current value (from the default):** `false`
+
+From [//topaz/runtime/web_view/config.gni:12](https://fuchsia.googlesource.com/topaz/+/405ad67e55816c4f6697c010cfc362da84cede17/runtime/web_view/config.gni#12)
### known_variants
List of variants that will form the basis for variant toolchains.
@@ -713,1051 +1741,8 @@
From [//build/config/BUILDCONFIG.gn:334](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#334)
-### devmgr_config
-List of arguments to add to /boot/config/devmgr.
-These come after synthesized arguments to configure blobfs and pkgfs,
-and the one generated for [`enable_crashpad`](#enable_crashpad).
-
-**Current value (from the default):** `[]`
-
-From [//build/images/BUILD.gn:340](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#340)
-
-### flutter_profile
-
-**Current value (from the default):** `true`
-
-From [//topaz/runtime/flutter_runner/flutter_app.gni:33](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/flutter_runner/flutter_app.gni#33)
-
-### prebuilt_libvulkan_arm_path
-
-**Current value (from the default):** `""`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:25](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#25)
-
-### scenic_enable_vulkan_validation
-Include the vulkan validation layers in scenic even in release builds
-TODO(SCN-1003): Set the default to false once we know why disabling
-validation layers causes a display swapchain setup issue.
-
-**Current value (from the default):** `true`
-
-From [//garnet/bin/ui/BUILD.gn:12](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/ui/BUILD.gn#12)
-
-### build_libvulkan
-This is a list of targets that will be built as vulkan ICDS. If more than one
-target is given then use_vulkan_loader_for_tests must be set to true, as
-otherwise tests won't know which libvulkan to use.
-
-**Current value (from the default):** `[]`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:38](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#38)
-
-### dart_debug_optimization_level
-The optimization level to use for debug builds.
-
-**Current value (from the default):** `"2"`
-
-From //third_party/dart/runtime/runtime_args.gni:35
-
-### dart_runtime_mode
-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
-
-### dart_snapshot_kind
-
-**Current value (from the default):** `"kernel"`
-
-From //third_party/dart/utils/application_snapshot.gni:14
-
-### skia_enable_effects_imagefilters
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:40
-
-### skia_use_libheif
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:33
-
-### use_goma
-Set to true to enable distributed compilation using Goma.
-
-**Current value (from the default):** `false`
-
-From [//build/toolchain/goma.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/goma.gni#9)
-
-### zircon_use_asan
-Set this if [`zircon_build_dir`](#zircon_build_dir) was built with
-`USE_ASAN=true`, e.g. `[//scripts/build-zircon.sh](https://fuchsia.googlesource.com/scripts/+/48d7386d44513a43d2a71ce2b3b2a52db1ed4c2d/build-zircon.sh) -A`. This mainly
-affects the defaults for [`zircon_build_dir`](#zircon_build_dir) and
-[`zircon_build_abi_dir`](#zircon_build_abi_dir). It also gets noticed
-by [//scripts/fx](https://fuchsia.googlesource.com/scripts/+/48d7386d44513a43d2a71ce2b3b2a52db1ed4c2d/fx) commands that rebuild Zircon so that they use `-A`
-again next time.
-
-**Current value (from the default):** `false`
-
-From [//build/config/fuchsia/zircon.gni:40](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#40)
-
-### universal_variants
-
-**Current value (from the default):**
-```
-[{
- configs = []
- name = "release"
- toolchain_args = {
- is_debug = false
-}
-}]
-```
-
-From [//build/config/BUILDCONFIG.gn:413](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#413)
-
-### use_scudo
-Enable the [Scudo](https://llvm.org/docs/ScudoHardenedAllocator.html)
-memory allocator.
-
-**Current value (from the default):** `true`
-
-From [//build/config/scudo/scudo.gni:8](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/scudo/scudo.gni#8)
-
-### bootfs_extra
-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:357](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#357)
-
-### select_variant
-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`](#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`](#known_variants) and
-[`universal_variants`](#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:613](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#613)
-
-### shell_skia_version
-
-**Current value (from the default):** `""`
-
-From //third_party/flutter/shell/version/version.gni:8
-
-### synthesize_packages
-List of extra packages to synthesize on the fly. This is only for
-things that do not appear normally in the source tree. Synthesized
-packages can contain build artifacts only if they already exist in some
-part of the build. They can contain arbitrary verbatim files.
-Synthesized packages can't express dependencies on other packages.
-
-Each element of this list is a scope that is very much like the body of
-a package() template invocation (see [//build/package.gni](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/package.gni)). That scope
-must set `name` to the string naming the package, as would be the name
-in the package() target written in a GN file. This must be unique
-among all package names.
-
-**Current value (from the default):** `[]`
-
-From [//build/gn/packages.gni:43](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/gn/packages.gni#43)
-
-### skia_use_vulkan
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:70
-
-### target_sysroot
-The absolute path of the sysroot that is used with the target toolchain.
-
-**Current value (from the default):** `""`
-
-From [//build/config/sysroot.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/sysroot.gni#7)
-
-### use_thinlto
-Use ThinLTO variant of LTO if use_lto = true.
-
-**Current value (from the default):** `true`
-
-From [//build/config/lto/config.gni:10](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#10)
-
-### amber_repository_blobs_dir
-
-**Current value (from the default):** `"//root_build_dir/amber-files/repository/blobs"`
-
-From [//garnet/go/src/amber/amber.gni:16](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/go/src/amber/amber.gni#16)
-
-### magma_python_path
-
-**Current value (from the default):** `"/b/s/w/ir/kitchen-workdir/third_party/mako"`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:12](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#12)
-
-### prebuilt_dart_sdk
-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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/dart/dart.gni#9)
-
-### skia_enable_ccpr
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:37
-
-### thinlto_cache_dir
-ThinLTO cache directory path.
-
-**Current value (from the default):** `"thinlto-cache"`
-
-From [//build/config/lto/config.gni:16](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/lto/config.gni#16)
-
-### use_prebuilt_ffmpeg
-Use a prebuilt ffmpeg binary rather than building it locally. See
-[//garnet/bin/mediaplayer/ffmpeg/README.md](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/mediaplayer/ffmpeg/README.md) for details. This is
-ignored when building media_player in variant builds (e.g. sanitizers);
-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 because media_player is a variant build) then //third_party/ffmpeg
-must be in the source tree, which requires:
-`jiri import -name garnet manifest/ffmpeg https://fuchsia.googlesource.com/garnet`
-
-**Current value (from the default):** `true`
-
-From [//garnet/bin/mediaplayer/ffmpeg/BUILD.gn:14](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/mediaplayer/ffmpeg/BUILD.gn#14)
-
-### extra_manifest_args
-Extra args to globally apply to the manifest generation script.
-
-**Current value (from the default):** `[]`
-
-From [//build/images/manifest.gni:47](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#47)
-
-### sdk_dirs
-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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/sdk.gni#10)
-
-### skia_tools_require_resources
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:60
-
-### skia_use_piex
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:30
-
-### toolchain_manifests
-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/kitchen-workdir/buildtools/linux-x64/clang/lib/aarch64-fuchsia.manifest"]`
-
-From [//build/images/manifest.gni:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#11)
-
-### zircon_system_groups
-Groups to include from the Zircon /boot manifest into /system
-(instead of into /boot like Zircon's own bootdata.bin does).
-Should not include any groups that are also in zircon_boot_groups,
-which see. If zircon_boot_groups is "all" then this should be "".
-**TODO(mcgrathr)**: _Could default to "" for `!is_debug`, or "production
-build". Note including `"test"` here places all of Zircon's tests into
-`/system/test`, which means that Fuchsia bots run those tests too._
-
-**Current value (from the default):** `"misc,test"`
-
-From [//build/images/BUILD.gn:36](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#36)
-
-### kernel_cmdline_args
-List of kernel command line arguments to bake into the boot image.
-See also [//zircon/docs/kernel_cmdline.md](https://fuchsia.googlesource.com/zircon/+/ff897d782387f0496627e8fd596ba5385dec7ed9/docs/kernel_cmdline.md) and
-[`devmgr_config`](#devmgr_config).
-
-**Current value (from the default):** `[]`
-
-From [//build/images/BUILD.gn:345](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#345)
-
-### select_variant_shortcuts
-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`](#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:439](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#439)
-
-### skia_use_zlib
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:31
-
-### symbol_level
-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](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/compiler.gni#13)
-
-### custom_signing_script
-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:10](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/custom_signing.gni#10)
-
-### skia_enable_atlas_text
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:65
-
-### skia_enable_discrete_gpu
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:38
-
-### skia_enable_pdf
-
-**Current value for `target_cpu = "arm64"`:** `false`
-
-From //.gn:28
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:44
-
-**Current value for `target_cpu = "x64"`:** `false`
-
-From //.gn:28
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:44
-
-### skia_use_libwebp
-
-**Current value for `target_cpu = "arm64"`:** `false`
-
-From //.gn:32
-
-**Overridden from the default:** `false`
-
-From //third_party/skia/BUILD.gn:27
-
-**Current value for `target_cpu = "x64"`:** `false`
-
-From //.gn:32
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:27
-
-### zircon_build_dir
-Zircon build directory for `target_cpu`, containing `.manifest` and
-`.zbi` files for Zircon's BOOTFS and kernel. This provides the kernel
-and Zircon components used in the boot image. It also provides the
-Zircon shared libraries used at runtime in Fuchsia packages.
-
-If left `""` (the default), then this is computed from
-[`zircon_build_abi_dir`](#zircon_build_abi_dir) and
-[`zircon_use_asan`](#zircon_use_asan).
-
-**Current value (from the default):** `""`
-
-From [//build/config/fuchsia/zircon.gni:24](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#24)
-
-### amber_repository_dir
-Directory containing files named by their merkleroot content IDs in
-ASCII hex. The [//build/image](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/image):amber_publish_blobs target populates
-this with copies of build products, but never removes old files.
-
-**Current value (from the default):** `"//root_build_dir/amber-files"`
-
-From [//garnet/go/src/amber/amber.gni:11](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/go/src/amber/amber.gni#11)
-
-### core_jit_cheat_trace
-
-**Current value (from the default):** `""`
-
-From [//topaz/runtime/flutter_runner/kernel/BUILD.gn:28](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/flutter_runner/kernel/BUILD.gn#28)
-
-### crashpad_dependencies
-Determines various flavors of build configuration, and which concrete
-targets to use for dependencies. Valid values are "standalone",
-"chromium", and "fuchsia". Defaulted to "fuchsia" because
-"is_fuchsia_tree" is set.
-
-**Current value (from the default):** `"fuchsia"`
-
-From [//third_party/crashpad/build/crashpad_buildconfig.gni:26](https://chromium.googlesource.com/crashpad/crashpad/+/237c5ebdf3a911cd09c2843822fe3d7c5081ed54/build/crashpad_buildconfig.gni#26)
-
-### data_image_size
-The size of the minfs data partition image to create. Normally this image
-is added to FVM, and can therefore expand as needed. It must be at least
-10mb (the default) in order to be succesfully initialized.
-
-**Current value (from the default):** `"10m"`
-
-From [//build/images/BUILD.gn:564](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#564)
-
-### zedboot_devmgr_config
-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:24](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/zedboot/BUILD.gn#24)
-
-### dart_target_arch
-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
-
-### fvm_slice_size
-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/BUILD.gn:577](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#577)
-
-### glm_build_root
-
-**Current value (from the default):** `"//third_party/glm"`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:9](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#9)
-
-### msd_intel_gen_build_root
-
-**Current value (from the default):** `"//garnet/drivers/gpu/msd-intel-gen"`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:8](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#8)
-
-### skia_use_sfntly
-
-**Current value for `target_cpu = "arm64"`:** `false`
-
-From //.gn:33
-
-**Overridden from the default:** `false`
-
-From //third_party/skia/BUILD.gn:64
-
-**Current value for `target_cpu = "x64"`:** `false`
-
-From //.gn:33
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:64
-
-### use_prebuilt_webkit
-Use a prebuilt WebKit binary rather than building it locally.
-See [//topaz/runtime/web_view/README.md](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/web_view/README.md) for details on the prebuilt.
-This is ignored when building WebKit-using components
-such as `web_view` in variant builds (e.g. sanitizers).
-
-**Current value (from the default):** `true`
-
-From [//topaz/runtime/web_view/config.gni:10](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/web_view/config.gni#10)
-
-### zedboot_cmdline_args
-List of kernel command line arguments to bake into the Zedboot image.
-See [//zircon/docs/kernel_cmdline.md](https://fuchsia.googlesource.com/zircon/+/ff897d782387f0496627e8fd596ba5385dec7ed9/docs/kernel_cmdline.md) and
-[`zedboot_devmgr_config`](#zedboot_devmgr_config).
-
-**Current value (from the default):** `[]`
-
-From [//build/images/zedboot/BUILD.gn:15](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/zedboot/BUILD.gn#15)
-
-### zircon_boot_groups
-Groups to include from the Zircon /boot manifest into /boot.
-This is either "all" or a comma-separated list of one or more of:
- core -- necessary to boot
- misc -- utilities in /bin
- test -- test binaries in /bin and /test
-
-**Current value (from the default):** `"core"`
-
-From [//build/images/BUILD.gn:25](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#25)
-
-### cloudkms_key_dir
-
-**Current value (from the default):** `"projects/fuchsia-infra/locations/global/keyRings/test-secrets/cryptoKeys"`
-
-From [//build/testing/secret_spec.gni:8](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/testing/secret_spec.gni#8)
-
-### dart_platform_bytecode
-Whether the VM's platform dill file contains bytecode.
-
-**Current value (from the default):** `false`
-
-From //third_party/dart/runtime/runtime_args.gni:82
-
-### dart_zlib_path
-The BUILD.gn file that we pull from chromium as part of zlib has a
-dependence on //base, which we don't pull in. In a standalone build of the
-VM, we set this to //runtime/bin/zlib where we have a BUILD.gn file without
-a dependence on //base.
-
-**Current value (from the default):** `"//third_party/zlib"`
-
-From //third_party/dart/runtime/runtime_args.gni:45
-
-### skia_use_fontconfig
-
-**Current value for `target_cpu = "arm64"`:** `false`
-
-From //.gn:31
-
-**Overridden from the default:** `false`
-
-From //third_party/skia/BUILD.gn:22
-
-**Current value for `target_cpu = "x64"`:** `false`
-
-From //.gn:31
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:22
-
-### skia_skqp_enable_driver_correctness_workarounds
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:54
-
-### zircon_aux_manifests
-
-**Current value (from the default):** `["//out/build-zircon/build-arm64-asan/bootfs.manifest"]`
-
-From [//build/images/manifest.gni:32](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#32)
-
-### dart_force_product
-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](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/dart/config.gni#10)
-
-### enable_crashpad
-When this is set, Crashpad will be used to handle exceptions (which uploads
-crashes to the crash server), rather than crashanalyzer in Zircon (which
-prints the crash log to the the system log).
-
-**Current value (from the default):** `false`
-
-From [//build/images/crashpad.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/crashpad.gni#9)
-
-### icu_use_data_file
-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](https://fuchsia.googlesource.com/third_party/icu/+/15006476e9d2f5c7d6691f3658fecff4929aaf68/config.gni#15)
-
-### scudo_default_options
-Default [Scudo](https://llvm.org/docs/ScudoHardenedAllocator.html)
-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:15](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/scudo/scudo.gni#15)
-
-### use_ccache
-Set to true to enable compiling with ccache
-
-**Current value (from the default):** `false`
-
-From [//build/toolchain/ccache.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/toolchain/ccache.gni#9)
-
-### build_intel_gen
-
-**Current value (from the default):** `false`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:23](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#23)
-
-### dart_use_fallback_root_certificates
-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:39
-
-### extra_authorized_keys_file
-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](https://fuchsia.googlesource.com/third_party/openssh-portable/+/961fd14159e8bde1185388dcf4bb240a7fa49841/fuchsia/developer-keys/BUILD.gn#11)
-
-### scenic_ignore_vsync
-
-**Current value (from the default):** `false`
-
-From [//garnet/lib/ui/gfx/BUILD.gn:16](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/ui/gfx/BUILD.gn#16)
-
-### skia_use_angle
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:19
-
-### skia_use_expat
-
-**Current value for `target_cpu = "arm64"`:** `false`
-
-From //.gn:30
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:21
-
-**Current value for `target_cpu = "x64"`:** `false`
-
-From //.gn:30
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:21
-
-### skia_use_icu
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:24
-
-### target_os
-
-**Current value (from the default):** `""`
-
-### dart_pool_depth
-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/toolchain.gni:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/dart/toolchain.gni#11)
-
-### host_cpu
-
-**Current value (from the default):** `"x64"`
-
-### host_os
-
-**Current value (from the default):** `"linux"`
-
-### scenic_use_views2
-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](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/ui/scenic/config.gni#7)
-
-### zircon_asan_build_dir
-Zircon `USE_ASAN=true` build directory for `target_cpu` containing
-`bootfs.manifest` with libraries and `devhost.asan`.
-
-If left `""` (the default), then this is computed from
-[`zircon_build_dir`](#zircon_build_dir) and
-[`zircon_use_asan`](#zircon_use_asan).
-
-**Current value (from the default):** `""`
-
-From [//build/config/fuchsia/zircon.gni:32](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#32)
-
-### flutter_aot_sharing_basis
-Armadillo is not AOT compiled in debug builds
-
-**Current value (from the default):** `""`
-
-From [//topaz/runtime/flutter_runner/flutter_app.gni:25](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/flutter_runner/flutter_app.gni#25)
-
-### fuchsia_use_vulkan
-Consolidated build toggle for use of Vulkan across Fuchsia
-
-**Current value (from the default):** `true`
-
-From [//build/vulkan/config.gni:7](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/vulkan/config.gni#7)
-
-### skia_use_x11
-
-**Current value for `target_cpu = "arm64"`:** `false`
-
-From //.gn:34
-
-**Overridden from the default:** `false`
-
-From //third_party/skia/BUILD.gn:34
-
-**Current value for `target_cpu = "x64"`:** `false`
-
-From //.gn:34
-
-**Overridden from the default:** `true`
-
-From //third_party/skia/BUILD.gn:34
-
-### zircon_tools_dir
-Where to find Zircon's host-side tools that are run as part of the build.
-
-**Current value (from the default):** `"//out/build-zircon/tools"`
-
-From [//build/config/fuchsia/zircon.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#9)
-
-### use_vulkan_loader_for_tests
-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:33](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#33)
-
-### build_vsl_gc
-
-**Current value (from the default):** `true`
-
-From [//garnet/lib/magma/gnbuild/magma.gni:22](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#22)
-
-### rust_lto
-Sets the default LTO type for rustc bulids.
-
-**Current value (from the default):** `"unset"`
-
-From [//build/rust/config.gni:20](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/rust/config.gni#20)
-
-### skia_enable_vulkan_debug_layers
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:47
-
-### skia_use_opencl
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:29
-
-### zircon_build_abi_dir
-Zircon build directory for `target_cpu`, containing link-time `.so.abi`
-files that GN `deps` on [//zircon/public](https://fuchsia.googlesource.com/zircon/+/ff897d782387f0496627e8fd596ba5385dec7ed9/public) libraries will link against.
-This should not be a sanitizer build.
-
-**Current value (from the default):** `"//out/build-zircon/build-arm64"`
-
-From [//build/config/fuchsia/zircon.gni:14](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/fuchsia/zircon.gni#14)
-
-### armadillo_path_context_config
-
-**Current value (from the default):** `"../bin/user_shell/armadillo_user_shell/assets/contextual_config.json"`
-
-From [//topaz/shell/BUILD.gn:14](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/shell/BUILD.gn#14)
-
-### crashpad_use_boringssl_for_http_transport_socket
-
-**Current value (from the default):** `true`
-
-From [//third_party/crashpad/util/net/tls.gni:18](https://chromium.googlesource.com/crashpad/crashpad/+/237c5ebdf3a911cd09c2843822fe3d7c5081ed54/util/net/tls.gni#18)
-
-### enable_input_subsystem
-
-**Current value (from the default):** `true`
-
-From [//garnet/bin/ui/scenic/BUILD.gn:14](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/bin/ui/scenic/BUILD.gn#14)
-
-### is_debug
-Debug build.
-
-**Current value (from the default):** `true`
-
-From [//build/config/BUILDCONFIG.gn:11](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/BUILDCONFIG.gn#11)
-
-### flutter_runtime_mode
-The runtime mode ("debug", "profile", "release", "dynamic_profile", or "dynamic_release")
-
-**Current value (from the default):** `"debug"`
-
-From //third_party/flutter/common/config.gni:18
-
-### kernel_cmdline_files
-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`](#kernel_cmdline_args).
-These can be GN `//` source pathnames or absolute system pathnames.
-
-**Current value (from the default):** `[]`
-
-From [//build/images/BUILD.gn:351](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/BUILD.gn#351)
-
-### skia_lex
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:52
-
-### skia_use_metal
-
-**Current value (from the default):** `false`
-
-From //third_party/skia/BUILD.gn:32
-
-### create_kernel_service_snapshot
-
-**Current value (from the default):** `false`
-
-From //third_party/dart/runtime/runtime_args.gni:99
-
-### embedder_for_target
-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
-
-### experimental_web_entity_extraction
-
-**Current value (from the default):** `false`
-
-From [//topaz/runtime/web_view/config.gni:12](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/web_view/config.gni#12)
-
-### flutter_aot
-Enable ahead-of-time compilation on platforms where AOT is optional.
-
-**Current value (from the default):** `false`
-
-From //third_party/flutter/common/config.gni:15
-
-### zircon_boot_manifests
-Manifest files describing files to go into the `/boot` filesystem.
-Can be either // source paths or absolute system paths.
-`zircon_boot_groups` controls which files are actually selected.
-
-Since Zircon manifest files are relative to a Zircon source directory
-rather than to the directory containing the manifest, these are assumed
-to reside in a build directory that's a direct subdirectory of the
-Zircon source directory and thus their contents can be taken as
-relative to `get_path_info(entry, "dir") + "/.."`.
-
-**Current value (from the default):** `["//out/build-zircon/build-arm64/bootfs.manifest"]`
-
-From [//build/images/manifest.gni:44](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/images/manifest.gni#44)
-
-### skia_qt_path
-
-**Current value (from the default):** `""`
-
-From //third_party/skia/BUILD.gn:49
-
-### skia_use_freetype
-
-**Current value (from the default):** `true`
-
-From //third_party/skia/BUILD.gn:23
-
-### clang_prefix
-
-**Current value (from the default):** `"../buildtools/linux-x64/clang/bin"`
-
-From [//build/config/clang/clang.gni:9](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/clang/clang.gni#9)
-
-### dart_aot_sharing_basis
-module_suggester is not AOT compiled in debug builds
-
-**Current value (from the default):** `""`
-
-From [//topaz/runtime/dart_runner/dart_app.gni:25](https://fuchsia.googlesource.com/topaz/+/4bc3b9f2b55512c3017a793586c02b5b71286142/runtime/dart_runner/dart_app.gni#25)
-
-### skia_android_serial
-
-**Current value (from the default):** `""`
-
-From //third_party/skia/BUILD.gn:36
-
-### skia_llvm_lib
-
-**Current value (from the default):** `"LLVM"`
-
-From //third_party/skia/BUILD.gn:58
-
## `target_cpu = "arm64"`
-### msd_arm_enable_all_cores
-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](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/drivers/gpu/msd-arm-mali/src/BUILD.gn#9)
-
-### msd_arm_enable_cache_coherency
-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](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/drivers/gpu/msd-arm-mali/src/BUILD.gn#13)
-
### arm_float_abi
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
@@ -1796,19 +1781,34 @@
From [//build/config/arm.gni:12](https://fuchsia.googlesource.com/build/+/7a24eda422bb4e06eadeb72738332d05e51e9d5b/config/arm.gni#12)
+### msd_arm_enable_all_cores
+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](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/drivers/gpu/msd-arm-mali/src/BUILD.gn#9)
+
+### msd_arm_enable_cache_coherency
+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](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/drivers/gpu/msd-arm-mali/src/BUILD.gn#13)
+
## `target_cpu = "x64"`
### mesa_build_root
**Current value (from the default):** `"//third_party/mesa"`
-From [//garnet/lib/magma/gnbuild/magma.gni:41](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/lib/magma/gnbuild/magma.gni#41)
+From [//garnet/lib/magma/gnbuild/magma.gni:41](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/lib/magma/gnbuild/magma.gni#41)
### msd_intel_enable_mapping_cache
**Current value (from the default):** `false`
-From [//garnet/drivers/gpu/msd-intel-gen/src/BUILD.gn:8](https://fuchsia.googlesource.com/garnet/+/1340f86a4603722c7d8f61c73a4b9187bc64ee9d/drivers/gpu/msd-intel-gen/src/BUILD.gn#8)
+From [//garnet/drivers/gpu/msd-intel-gen/src/BUILD.gn:8](https://fuchsia.googlesource.com/garnet/+/d9e4b894ed15b7e58ae8b8727a697844afb47a5f/drivers/gpu/msd-intel-gen/src/BUILD.gn#8)
### use_mock_magma
