1# Copyright (C) 2017 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15import("libc++.gni")
16
17config("config") {
18  if (use_custom_libcxx) {
19    defines = [
20      "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS",
21      "_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS",
22    ]
23    cflags_cc = [
24      "-nostdinc++",
25      "-isystem" + rebase_path("$libcxx_prefix/include", root_build_dir),
26      "-isystem" + rebase_path("$libcxxabi_prefix/include", root_build_dir),
27    ]
28
29    # In theory here we want just -nostdlib++ to avoid linking both libc++ and
30    # libstdc++. Unfortunately the -nostdlib++ switch is available only in
31    # bleeding edge versions of clang. So, in order to get rid of libstdc++
32    # we have to remove all libs and then re-add the core ones like libc.
33    ldflags = [ "-nodefaultlibs" ]
34    libs = [
35      "c",  # libc: the core C library.
36      "m",  # libm: math library.
37      "dl",  # libdl: dynamic linking.
38      "gcc_eh",  # gcc exception handling, required by libunwind.
39    ]
40  }
41}
42
43group("deps") {
44  if (use_custom_libcxx) {
45    public_deps = [
46      "//buildtools:libc++",
47    ]
48  }
49}
50