[fuchsia] Use GN rules provided by the Fuchsia SDK.

- Use the SDK-provided config.gni in //build/config/fuchsia/config.gni.
- Remove the fuchsia_sdk_pkg.gni and gen_fidl_response_file.py.
- Use the SDK-provided runtime_library_group to get runtime libraries.
- Temporarily have //build/config/fuchsia/fidl_lbrary.gni redirect to
  the SDK-provided version.
- Temporarily update gen_build_defs.py to generate "redirect" rules,
  from the old Chromium targets to the SDK-provided ones.

Follow-up CLs will migrate away from gen_build_defs.py to direct
dependencies on the SDK-provided libraries, etc.

Bug: 1050703
Change-Id: Ib970aa99fe1a2808d30a536dd0d370db6ab8c4d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057307
Auto-Submit: Wez <wez@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#741942}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 3f773d0095872c44b5b975a66cba9527b9aac2e0

config/BUILD.gn

@@ -270,7 +270,8 @@ group("common_deps") {
   }
 
   if (is_fuchsia) {
-    public_deps += [ "//third_party/fuchsia-sdk:runtime_library" ]
+    public_deps +=
+        [ "//third_party/fuchsia-sdk/sdk/build/config:runtime_library_group" ]
   }
 }
 

config/fuchsia/config.gni

@@ -2,25 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-assert(current_os == "fuchsia")
+assert(is_fuchsia)
 
-declare_args() {
-  # Paths to Fuchsia SDKs.
-  fuchsia_sdk = "//third_party/fuchsia-sdk/sdk"
-
-  # TODO(steveroe): Make linux-x64 and linux-arm64 sdk paths match
-  # when the linux-arm64 sdk is retrieved from GCS.
-  fuchsia_arm64_sdk = "//third_party/fuchsia-sdk-arm64"
-}
-
-# Compute the arch-specific path to packages' dynamic library dependencies.
-if (current_cpu == "arm64") {
-  dist_libroot = fuchsia_sdk + "/arch/arm64/dist"
-} else if (current_cpu == "x64") {
-  dist_libroot = fuchsia_sdk + "/arch/x64/dist"
-} else {
-  assert(false, "No libraries available for architecture: $current_cpu")
-}
+import("//third_party/fuchsia-sdk/sdk/build/config/config.gni")
 
 # Compute the emulator paths.
 aemu_root = "//third_party/aemu-${host_os}-${host_cpu}"

config/fuchsia/fidl_library.gni

@@ -2,207 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/fuchsia/config.gni")
-
 assert(is_fuchsia)
 
-# Template for FIDL libraries. Following parameters can be passed when
-# instantiating this template:
-#   sources        - List of .fidl files.
-#   library_name   - (optional) Name of the library. target_name is used if name
-#                    is not specified explicitly.
-#   namespace      - (optional) Namespace that should be prepended to
-#                    |library_name|.
-#   deps           - (optional) List of other fidl_library() targets that this
-#                    FIDL library depends on.
-#   languages      - Generate bindings for the given languages, defaults to
-#                    [ "cpp" ]. Only "cpp" is currently supported.
-#
-# $namespace.$library_name must match the the library name specified in the FIDL
-# files.
-
-template("fidl_library") {
-  forward_variables_from(invoker, [ "languages" ])
-
-  _library_name = target_name
-  if (defined(invoker.library_name)) {
-    _library_name = invoker.library_name
-  }
-
-  if (defined(invoker.namespace)) {
-    _library_name = "${invoker.namespace}.${_library_name}"
-  }
-
-  _library_path = string_replace(_library_name, ".", "/")
-
-  if (!defined(invoker.languages)) {
-    languages = [ "cpp" ]
-  }
-
-  assert(languages == [ "cpp" ])
-  _define_cpp_action = true
-
-  _response_file = "$target_gen_dir/$target_name.rsp"
-  _json_representation = "$target_gen_dir/${_library_name}.fidl.json"
-  _output_gen_dir = "$target_gen_dir/fidl"
-  _output_base = "$_output_gen_dir/${_library_path}/cpp/fidl"
-  _tables_file = "$_output_gen_dir/${_library_name}.fidl-tables.c"
-
-  action("${target_name}_response_file") {
-    script = "//third_party/fuchsia-sdk/gen_fidl_response_file.py"
-
-    forward_variables_from(invoker,
-                           [
-                             "deps",
-                             "public_deps",
-                             "sources",
-                             "testonly",
-                           ])
-
-    _libraries_file = "$target_gen_dir/${invoker.target_name}.fidl_libraries"
-
-    outputs = [
-      _response_file,
-      _libraries_file,
-    ]
-
-    args = [
-             "--out-response-file",
-             rebase_path(_response_file, root_build_dir),
-             "--out-libraries",
-             rebase_path(_libraries_file, root_build_dir),
-             "--tables",
-             rebase_path(_tables_file, root_build_dir),
-             "--json",
-             rebase_path(_json_representation, root_build_dir),
-             "--name",
-             _library_name,
-             "--sources",
-           ] + rebase_path(sources, root_build_dir)
-
-    if (defined(invoker.deps) || defined(invoker.public_deps)) {
-      merged_deps = []
-
-      if (defined(invoker.deps)) {
-        merged_deps += invoker.deps
-      }
-
-      if (defined(invoker.public_deps)) {
-        merged_deps += invoker.public_deps
-      }
-
-      dep_libraries = []
-      deps = []
-
-      foreach(dep, merged_deps) {
-        gen_dir = get_label_info(dep, "target_gen_dir")
-        name = get_label_info(dep, "name")
-        dep_libraries += [ "$gen_dir/$name.fidl_libraries" ]
-        deps += [ "${dep}_response_file" ]
-      }
-
-      inputs = dep_libraries
-
-      args += [ "--dep-libraries" ] + rebase_path(dep_libraries, root_build_dir)
-    }
-  }
-
-  action("${target_name}_compile") {
-    forward_variables_from(invoker, [ "testonly" ])
-
-    visibility = [ ":*" ]
-
-    deps = [ ":${invoker.target_name}_response_file" ]
-
-    script = "//build/gn_run_binary.py"
-
-    inputs = [
-      # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
-      "${fuchsia_sdk}/.hash",
-      _response_file,
-    ]
-
-    outputs = [
-      _json_representation,
-      _tables_file,
-    ]
-
-    rebased_response_file = rebase_path(_response_file, root_build_dir)
-    args = [
-      rebase_path("//third_party/fuchsia-sdk/sdk/tools/fidlc", root_build_dir),
-      "@$rebased_response_file",
-    ]
-  }
-
-  if (_define_cpp_action) {
-    action("${target_name}_cpp_gen") {
-      visibility = [ ":${invoker.target_name}" ]
-      forward_variables_from(invoker, [ "testonly" ])
-
-      deps = [ ":${invoker.target_name}_compile" ]
-
-      inputs = [
-        # Depend on the SDK hash, to ensure rebuild if the SDK tools change.
-        "${fuchsia_sdk}/.hash",
-        _json_representation,
-      ]
-
-      outputs = [
-        "${_output_base}.h",
-        "${_output_base}.cc",
-      ]
-
-      script = "//build/gn_run_binary.py"
-      args = [
-        rebase_path("//third_party/fuchsia-sdk/sdk/tools/fidlgen",
-                    root_build_dir),
-        "-generators",
-        "cpp",
-        "-json",
-        rebase_path(_json_representation, root_build_dir),
-        "-include-base",
-        rebase_path(_output_gen_dir, root_build_dir),
-        "-output-base",
-        rebase_path("${_output_base}", root_build_dir),
-      ]
-    }
-  }
-
-  config("${target_name}_config") {
-    visibility = [ ":${invoker.target_name}" ]
-    include_dirs = [ _output_gen_dir ]
-  }
-
-  source_set("${target_name}") {
-    forward_variables_from(invoker,
-                           [
-                             "deps",
-                             "public_deps",
-                             "testonly",
-                             "visibility",
-                           ])
-
-    sources = [
-      "${_output_base}.cc",
-      "${_output_base}.h",
-      _tables_file,
-    ]
-
-    if (!defined(deps)) {
-      deps = []
-    }
-    deps += [ ":${invoker.target_name}_compile" ]
-
-    foreach(language, languages) {
-      deps += [ ":${invoker.target_name}_${language}_gen" ]
-    }
-
-    if (!defined(public_deps)) {
-      public_deps = []
-    }
-    public_deps += [ "//third_party/fuchsia-sdk/sdk:fidl" ]
-    public_deps += [ "//third_party/fuchsia-sdk/sdk:fidl_cpp" ]
-
-    public_configs = [ ":${invoker.target_name}_config" ]
-  }
-}
+import("//third_party/fuchsia-sdk/sdk/build/fidl_library.gni")