build/config/profile/BUILD.gn

# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/config/profile/config.gni")
import("//build/toolchain/variant.gni")

if (profile_source_files != []) {
  # This can't use a generated_file() target because there's no way to
  # express the deps to make GN accept the file in the inputs list if it's
  # the output of some target.
  _profile_source_files_file = "$root_out_dir/profile-source-files.list"
  _profile_source_files_lines = []
  foreach(file, profile_source_files) {
    _profile_source_files_lines +=
        [ "src:" + rebase_path(file, root_build_dir) ]
  }
  write_file(_profile_source_files_file,
             _profile_source_files_lines,
             "list lines")
  profile_source_files_list_files += [ _profile_source_files_file ]
}

variant("profile") {
  common_flags = [
    "-fprofile-instr-generate",
    "-fcoverage-mapping",
  ]

  inputs = profile_source_files_list_files
  foreach(file, profile_source_files_list_files) {
    common_flags += [ "-fprofile-list=" + rebase_path(file, root_build_dir) ]
  }

  if (!is_kernel && is_fuchsia) {
    # The statically-linked profiling runtime depends on libzircon.
    # TODO(fxbug.dev/61522): Ensure this works with shared_library() instances too!
    deps = [ "//src/zircon/lib/zircon" ]

    dynamic_linker_flags = "-dynamic-linker=profile/ld.so.1"
    ldflags = [ "-Wl,$dynamic_linker_flags" ]
    rustflags = [ "-Clink-arg=$dynamic_linker_flags" ]
  }
}