[fuchsia] Guard out-of-tree Fuchsia targets to fix in-tree build (#8923)

shell/platform/BUILD.gn

@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/fuchsia/sdk.gni")
+
 group("platform") {
   if (is_mac || is_ios) {
     deps = [
@@ -26,9 +28,11 @@ group("platform") {
     ]
   } else if (is_fuchsia) {
     # Fuchsia has its own runner implementation.
-    deps = [
-      "fuchsia",
-    ]
+    if (using_fuchsia_sdk) {
+      deps = [
+        "fuchsia",
+      ]
+    }
   } else {
     assert(false, "Unknown/Unsupported platform.")
   }

shell/platform/fuchsia/BUILD.gn

@@ -6,86 +6,88 @@ assert(is_fuchsia)
 
 import("//build/fuchsia/sdk.gni")
 
-executable("fuchsia") {
-  output_name = "four_gate"
+if (using_fuchsia_sdk) {
+  executable("fuchsia") {
+    output_name = "four_gate"
 
-  sources = [
-    "component.cc",
-    "component.h",
-    "compositor_context.cc",
-    "compositor_context.h",
-    "context_writer_bridge.cc",
-    "context_writer_bridge.h",
-    "engine.cc",
-    "engine.h",
-    "fuchsia_font_manager.cc",
-    "fuchsia_font_manager.h",
-    "isolate_configurator.cc",
-    "isolate_configurator.h",
-    "logging.h",
-    "loop.cc",
-    "loop.h",
-    "main.cc",
-    "platform_view.cc",
-    "platform_view.h",
-    "runner.cc",
-    "runner.h",
-    "runner_context.cc",
-    "runner_context.h",
-    "service_provider_dir.cc",
-    "service_provider_dir.h",
-    "session_connection.cc",
-    "session_connection.h",
-    "surface.cc",
-    "surface.h",
-    "task_observers.cc",
-    "task_observers.h",
-    "task_runner_adapter.cc",
-    "task_runner_adapter.h",
-    "thread.cc",
-    "thread.h",
-    "unique_fdio_ns.h",
-    "vsync_recorder.cc",
-    "vsync_recorder.h",
-    "vsync_waiter.cc",
-    "vsync_waiter.h",
-    "vulkan_surface.cc",
-    "vulkan_surface.h",
-    "vulkan_surface_pool.cc",
-    "vulkan_surface_pool.h",
-    "vulkan_surface_producer.cc",
-    "vulkan_surface_producer.h",
-  ]
+    sources = [
+      "component.cc",
+      "component.h",
+      "compositor_context.cc",
+      "compositor_context.h",
+      "context_writer_bridge.cc",
+      "context_writer_bridge.h",
+      "engine.cc",
+      "engine.h",
+      "fuchsia_font_manager.cc",
+      "fuchsia_font_manager.h",
+      "isolate_configurator.cc",
+      "isolate_configurator.h",
+      "logging.h",
+      "loop.cc",
+      "loop.h",
+      "main.cc",
+      "platform_view.cc",
+      "platform_view.h",
+      "runner.cc",
+      "runner.h",
+      "runner_context.cc",
+      "runner_context.h",
+      "service_provider_dir.cc",
+      "service_provider_dir.h",
+      "session_connection.cc",
+      "session_connection.h",
+      "surface.cc",
+      "surface.h",
+      "task_observers.cc",
+      "task_observers.h",
+      "task_runner_adapter.cc",
+      "task_runner_adapter.h",
+      "thread.cc",
+      "thread.h",
+      "unique_fdio_ns.h",
+      "vsync_recorder.cc",
+      "vsync_recorder.h",
+      "vsync_waiter.cc",
+      "vsync_waiter.h",
+      "vulkan_surface.cc",
+      "vulkan_surface.h",
+      "vulkan_surface_pool.cc",
+      "vulkan_surface_pool.h",
+      "vulkan_surface_producer.cc",
+      "vulkan_surface_producer.h",
+    ]
 
-  deps = [
-    "$flutter_root/common",
-    "$flutter_root/flow",
-    "$flutter_root/fml",
-    "$flutter_root/lib/ui",
-    "$flutter_root/runtime",
-    "$flutter_root/runtime:libdart",
-    "$flutter_root/shell/common",
-    "$flutter_root/vulkan",
-    "$fuchsia_sdk_root/fidl:fuchsia.fonts",
-    "$fuchsia_sdk_root/fidl:fuchsia.images",
-    "$fuchsia_sdk_root/fidl:fuchsia.io",
-    "$fuchsia_sdk_root/fidl:fuchsia.modular",
-    "$fuchsia_sdk_root/fidl:fuchsia.sys",
-    "$fuchsia_sdk_root/fidl:fuchsia.ui.app",
-    "$fuchsia_sdk_root/fidl:fuchsia.ui.scenic",
-    "$fuchsia_sdk_root/pkg:async-cpp",
-    "$fuchsia_sdk_root/pkg:async-loop",
-    "$fuchsia_sdk_root/pkg:async-loop-cpp",
-    "$fuchsia_sdk_root/pkg:fdio",
-    "$fuchsia_sdk_root/pkg:fidl_cpp",
-    "$fuchsia_sdk_root/pkg:scenic_cpp",
-    "$fuchsia_sdk_root/pkg:syslog",
-    "$fuchsia_sdk_root/pkg:zx",
-    "$fuchsia_sdk_root/pkg/lib/sys/cpp",
-    "$fuchsia_sdk_root/pkg/lib/vfs/cpp",
-    "dart-pkg/fuchsia",
-    "dart-pkg/zircon",
-    "runtime/dart/utils",
-    "//third_party/tonic",
-  ]
+    deps = [
+      "$flutter_root/common",
+      "$flutter_root/flow",
+      "$flutter_root/fml",
+      "$flutter_root/lib/ui",
+      "$flutter_root/runtime",
+      "$flutter_root/runtime:libdart",
+      "$flutter_root/shell/common",
+      "$flutter_root/vulkan",
+      "$fuchsia_sdk_root/fidl:fuchsia.fonts",
+      "$fuchsia_sdk_root/fidl:fuchsia.images",
+      "$fuchsia_sdk_root/fidl:fuchsia.io",
+      "$fuchsia_sdk_root/fidl:fuchsia.modular",
+      "$fuchsia_sdk_root/fidl:fuchsia.sys",
+      "$fuchsia_sdk_root/fidl:fuchsia.ui.app",
+      "$fuchsia_sdk_root/fidl:fuchsia.ui.scenic",
+      "$fuchsia_sdk_root/pkg:async-cpp",
+      "$fuchsia_sdk_root/pkg:async-loop",
+      "$fuchsia_sdk_root/pkg:async-loop-cpp",
+      "$fuchsia_sdk_root/pkg:fdio",
+      "$fuchsia_sdk_root/pkg:fidl_cpp",
+      "$fuchsia_sdk_root/pkg:scenic_cpp",
+      "$fuchsia_sdk_root/pkg:syslog",
+      "$fuchsia_sdk_root/pkg:zx",
+      "$fuchsia_sdk_root/pkg/lib/sys/cpp",
+      "$fuchsia_sdk_root/pkg/lib/vfs/cpp",
+      "dart-pkg/fuchsia",
+      "dart-pkg/zircon",
+      "runtime/dart/utils",
+      "//third_party/tonic",
+    ]
+  }
 }