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This prepares the buildroot to stamp GN targets for Fuchsia SDK defined targets. GN templates have been created in //build/fuchsia/fuchsia.gni that can read the JSON metadata that describes the vended SDK. GN targets that describe all known SDK parts (as described in the SDK manifest) can be instantiated in one shot by defining a top level fuchsia_sdk target. This stamping needs to happen once and can be done anywhere (currenly in //build/fuchsia/BUILD.gn). Once stamped, targets that depend on specific Fuchsia SDK parts need to explicitly depend on them by using the name of that part. For example, depending on the :fuchsia.images part of the SDK will generate headers for all fidl files in that part, compile any source libraries and link the required dynamic libraries into the executable. Unlike regular targets, this target does not exist in a GN file. The name must be looked up from JSON manifest. This scheme seems to work well but is not resilient to part name collision. So that SDK and non-SDK Fuchsia builds may co-exist till the migration is done, the is_fuchsia_sdk GN variable and FUCHSIA_SDK preprocessor defines are set in all Fuchsia SDK builds. This allows code to target both variants. It is the hope that the non SDK variant will be turned down and the Flutter team assumes ownership of this component. |
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| .. | ||
| lib | ||
| vulkan/include/vulkan | ||
| BUILD.gn | ||
| fidl_gen_cpp.py | ||
| fuchsia.gni | ||