gn/perfetto_component.gni

# Copyright (C) 2020 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import("perfetto.gni")

# This template is used when generating build files via tools/gen_android_bp
# and tools/gen_bazel. This is to solve the problem that other build systems
# don't have a similar concept to GN's source_set and dependencies can only
# happen between static libraries (or shared, but we don't use them).

# In future this could be used for chromium component builds, where each
# component becomes its own shared library (see b/159411946). This alone isn't
# enough for that use case as it will require splitting also the various
# export.h files.

# TODO(primiano): we cannot split components as static libraries in Android
# because heapprofd_client rebuilds base with
# -DPERFETTO_ANDROID_ASYNC_SAFE_LOG. Once this is fixed re-enable the
# ODRChecker in tools/gen_android_bp.

# The condition below really means: "is Bazel generator".
if (is_perfetto_build_generator && !perfetto_build_with_android) {
  perfetto_component_type = "static_library"
} else {
  perfetto_component_type = "source_set"
}

template("perfetto_component") {
  target(perfetto_component_type, target_name) {
    forward_variables_from(invoker, "*")
    if (perfetto_component_type == "static_library") {
      # Mangle the name of the library putting the full path in it. In component
      # builds we don't care about file names, as nobody depends from the
      # outside on the internal component libraries.
      # This is because library targets are stored in the root output folder
      # (not in a subfolder that matches their path). This mangling avoid file
      # avoid name clashes when the target is called "common" or similar, so we
      # use src_ipc_common.a rather than common.a.
      _name = get_label_info(target_name, "label_no_toolchain")
      _name = string_replace(_name, "//", "")
      _name = string_replace(_name, "/", "_")
      _name = string_replace(_name, ":", "_")
      output_name = _name
      complete_static_lib = true
    }
  }
}