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#!/usr/bin/env python
#
# Copyright (C) 2015 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.
#
"""Builds libc++ for Android."""
from __future__ import print_function
import os
import shutil
import site
import subprocess
THIS_DIR = os.path.realpath(os.path.dirname(__file__))
site.addsitedir(os.path.join(THIS_DIR, '../../../build/lib'))
import build_support # pylint: disable=import-error
class ArgParser(build_support.ArgParser):
def __init__(self): # pylint: disable=super-on-old-class
super(ArgParser, self).__init__()
self.add_argument(
'--arch', choices=build_support.ALL_ARCHITECTURES,
help='Architectures to build. Builds all if not present.')
def make_linker_script(path, libs):
with open(path, 'w') as linker_script:
linker_script.write('INPUT({})\n'.format(' '.join(libs)))
def main(args):
arches = build_support.ALL_ARCHITECTURES
if args.arch is not None:
arches = [args.arch]
abis = []
for arch in arches:
abis.extend(build_support.arch_to_abis(arch))
ndk_build = build_support.ndk_path('build/ndk-build')
prebuilt_ndk = build_support.android_path('prebuilts/ndk')
platform_prebuilts = os.path.join(prebuilt_ndk, 'platform')
platforms_root = os.path.join(prebuilt_ndk, 'current/platforms')
unified_sysroot_path = os.path.join(platform_prebuilts, 'sysroot')
toolchains_root = os.path.join(prebuilt_ndk, 'current/toolchains')
libcxx_path = build_support.android_path('external/libcxx')
obj_out = os.path.join(args.out_dir, 'libcxx/obj')
# TODO(danalbert): Stop building to the source directory.
# This is historical, and simplifies packaging a bit. We need to pack up
# all the source as well as the libraries. If build_support.make_package
# were to change to allow a list of directories instead of one directory,
# we could make this unnecessary. Will be a follow up CL.
lib_out = os.path.join(libcxx_path, 'libs')
build_cmd = [
'bash', ndk_build, '-C', THIS_DIR, build_support.jobs_arg(), 'V=1',
'APP_ABI=' + ' '.join(abis),
# Use the prebuilt platforms and toolchains.
'NDK_UNIFIED_SYSROOT_PATH=' + unified_sysroot_path,
'NDK_PLATFORMS_ROOT=' + platforms_root,
'NDK_TOOLCHAINS_ROOT=' + toolchains_root,
'NDK_NEW_TOOLCHAINS_LAYOUT=true',
# Tell ndk-build where all of our makefiles are and where outputs
# should go. The defaults in ndk-build are only valid if we have a
# typical ndk-build layout with a jni/{Android,Application}.mk.
'NDK_PROJECT_PATH=null',
'APP_BUILD_SCRIPT=' + os.path.join(libcxx_path, 'Android.mk'),
'NDK_APPLICATION_MK=' + os.path.join(libcxx_path, 'Application.mk'),
'NDK_OUT=' + obj_out,
'NDK_LIBS_OUT=' + lib_out,
# Make sure we don't pick up a cached copy.
'LIBCXX_FORCE_REBUILD=true',
]
print('Building libc++ for ABIs: {}'.format(', '.join(abis)))
print('Running: ' + ' '.join(build_cmd))
subprocess.check_call(build_cmd)
# The static libraries are installed to NDK_OUT, not NDK_LIB_OUT, so we
# need to install them to our package directory.
for abi in abis:
static_lib_dir = os.path.join(obj_out, 'local', abi)
install_dir = os.path.join(lib_out, abi)
is_arm = abi.startswith('armeabi')
if is_arm:
shutil.copy2(
os.path.join(static_lib_dir, 'libunwind.a'), install_dir)
shutil.copy2(os.path.join(static_lib_dir, 'libc++abi.a'), install_dir)
shutil.copy2(
os.path.join(static_lib_dir, 'libandroid_support.a'), install_dir)
shutil.copy2(
os.path.join(static_lib_dir, 'libc++_static.a'), install_dir)
# Create linker scripts for the libraries we use so that we link things
# properly even when we're not using ndk-build. The linker will read
# the script in place of the library so that we link the unwinder and
# other support libraries appropriately.
static_libs = ['-lc++_static', '-lc++abi', '-landroid_support']
if is_arm:
static_libs.extend(['-lunwind', '-latomic'])
make_linker_script(os.path.join(install_dir, 'libc++.a'), static_libs)
shared_libs = ['-landroid_support']
if is_arm:
shared_libs.extend(['-lunwind', '-latomic'])
shared_libs.append('-lc++_shared')
make_linker_script(os.path.join(install_dir, 'libc++.so'), shared_libs)
build_support.make_package('libc++', libcxx_path, args.dist_dir)
if __name__ == '__main__':
build_support.run(main, ArgParser)
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