gn/standalone/libc++/BUILD.gn

# Copyright (C) 2017 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("libc++.gni")

config("config") {
  if (use_custom_libcxx) {
    defines = [
      "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS",
      "_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS",
    ]
    if (is_debug) {
      # libc++ has two levels of debug mode. Setting _LIBCPP_DEBUG to zero
      # enables most assertions. Setting it to one additionally enables iterator
      # debugging, but that seems to require some extra link-time dependencies.
      # See https://libcxx.llvm.org/docs/DesignDocs/DebugMode.html
      defines += [ "_LIBCPP_DEBUG=0" ]
    }
    cflags_cc = [
      "-nostdinc++",
      "-isystem" + rebase_path("$libcxx_prefix/include", root_build_dir),
      "-isystem" + rebase_path("$libcxxabi_prefix/include", root_build_dir),
    ]
    include_dirs = [ "//buildtools/libcxx_config" ]

    # Avoid linking both libc++ and libstdc++.
    ldflags = [ "-nostdlib++" ]
    libs = [ "dl" ]  # libdl: dynamic linking.
  }
}

group("deps") {
  if (use_custom_libcxx) {
    public_deps = [ "//buildtools:libc++" ]
  }
}