absl.gni

# Copyright 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This file contains the definition of the template absl_source_set which
# should be the only type of target needed in abseil's BUILD.gn files.
# This template will correctly set "configs" and "public_configs" in order
# to correctly compile abseil in Chromium.
#
# Targets that set visibility should set it to something more restrictive than
# `absl_visibility` (defined below).
#
# Usage:
# Most of the times its usage will be similar to the example below but all
# the arguments avilable in source_set are also available for absl_source_set.
#
#  absl_source_set("foo") {
#    sources = [ "foo.cc" ]
#    public = [ "foo.h" ]
#    deps = [ ":bar" ]
#  }

import("//build_overrides/build.gni")

# Usage of Abseil in Chromium is guarded by an explicit opt-in list, before
# adding projects to this list please reach out to cxx@chromium.org and CC:
# - https://cs.chromium.org/chromium/src/third_party/abseil-cpp/OWNERS
#
# More information can be found at:
# https://docs.google.com/document/d/1DgS1-A3rzboTLjpf4m1sqkJgWjnY_Ru2dokk1X1vBDU
declare_args() {
  # Additional targets that can depend on absl.
  additional_absl_clients = []
}

_chromium_absl_clients = [
  "//third_party/blink/renderer/modules/peerconnection",
  "//third_party/blink/renderer/platform",
  "//third_party/googletest:gtest",
  "//third_party/openscreen/src/third_party/abseil/*",
  "//third_party/private_membership/*",
  "//third_party/shell-encryption/*",
  "//third_party/webrtc/*",
]

# When adding a new package to `absl_visibility`, please check that all the
# Abseil dependencies that are required are listed in the dependencies of
# //third_party/abseil-cpp:absl. If not, please add them and run:
# //third_party/abseil-cpp/generate_def_file.py.
absl_visibility = _chromium_absl_clients + additional_absl_clients

template("absl_source_set") {
  source_set(target_name) {
    forward_variables_from(invoker, "*")
    configs -= [ "//build/config/compiler:chromium_code" ]
    configs += [
      "//build/config/compiler:no_chromium_code",
      "//third_party/abseil-cpp:absl_default_cflags_cc",
      "//third_party/abseil-cpp:absl_define_config",
    ]

    if (is_component_build) {
      defines = [ "ABSL_BUILD_DLL" ]
      if (!is_win) {
        configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
        configs += [ "//build/config/gcc:symbol_visibility_default" ]
      }
    }

    if (!defined(public_configs)) {
      public_configs = []
    }
    public_configs += [ "//third_party/abseil-cpp:absl_include_config" ]

    if (!defined(visibility)) {
      if (build_with_chromium) {
        visibility = [
          "//third_party/abseil-cpp/*",

          # WebRTC binary to run PSNR and SSIM video quality analysis. It
          # statically links absl and it is used by "browser_tests" when
          # is_component_build=false but it cannot depend on the absl
          # component because it uses absl/flags.
          "//third_party/webrtc/rtc_tools:frame_analyzer",
          # WebRTC binaries used by //:chromium_builder_asan, they both
          # statically link absl (because they depend on absl/flags) and are
          # used by Chromium only when is_component_build=false.
          "//third_party/webrtc/rtc_tools:rtp_generator",
          "//third_party/webrtc/rtc_tools:video_replay",

          # Not used by Chromium directly.
          "//chromecast/internal/*",
          "//libassistant/*",
        ]
      } else {
        visibility = [ "*" ]
      }
    }
  }
}