Move build scripts from ndk to toolchain/gcc.

First, the platform toolchains building with the NDK build scripts
was odd.

Second, this moves us toward a more modular NDK. The path forward is
building GCC separately, installing it to prebuilts/ndk, and then
using it directly from there when building other NDK components.

Bug: http://b/23362228
Change-Id: I21448e470b4c3353bd49a1fec7d187a8376f3d82
(cherry picked from commit 51f25cab1eccd079214b9e08f5fe1bbe9368e1b0)

1 files changed, 117 insertions, 0 deletions

diff --git a/build.py b/build.py
new file mode 100755
index 000000000..ea7a24a96
--- /dev/null
+++ b/build.py
@@ -0,0 +1,117 @@
+#!/usr/bin/env python2
+#
+# 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.
+#
+from __future__ import print_function
+
+import argparse
+import multiprocessing
+import os
+import subprocess
+import sys
+
+
+def android_path(path=''):
+    top = os.getenv('ANDROID_BUILD_TOP', '')
+    if not top:
+        sys.exit('ANDROID_BUILD_TOP not set. Cannot continue.\n'
+                 'Please set ANDROID_BUILD_TOP to point to the root of an '
+                 'Android tree.')
+    return os.path.realpath(os.path.join(top, path))
+
+
+def get_default_package_dir():
+    return android_path('out/ndk')
+
+
+def get_default_host():
+    if sys.platform in ('linux', 'linux2'):
+        return 'linux'
+    elif sys.platform == 'darwin':
+        return 'darwin'
+    else:
+        raise RuntimeError('Unsupported host: {}'.format(sys.platform))
+
+
+ALL_TOOLCHAINS = (
+    'arm-linux-androideabi', 'aarch64-linux-android',
+    'mipsel-linux-android', 'mips64el-linux-android',
+    'x86', 'x86_64',
+)
+
+
+class ArgParser(argparse.ArgumentParser):
+    def __init__(self):
+        super(ArgParser, self).__init__(
+            description='Builds GCC for Android.')
+
+        self.add_argument(
+            '--host', choices=('darwin', 'linux', 'windows', 'windows64'),
+            help='Build binaries for given OS (e.g. linux).')
+        self.add_argument(
+            '--package-dir', help='Directory to place the packaged GCC.',
+            default=get_default_package_dir())
+        self.add_argument(
+            '--toolchain', choices=ALL_TOOLCHAINS,
+            help='Toolchain to build. Builds all if not present.')
+
+
+def main():
+    args = ArgParser().parse_args()
+
+    os.chdir(android_path('toolchain/gcc'))
+
+    toolchain_path = android_path('toolchain')
+    ndk_path = android_path('prebuilts/ndk/current')
+
+    GCC_VERSION = '4.9'
+    jobs_arg = '-j{}'.format(multiprocessing.cpu_count() * 2)
+
+    package_dir_arg = '--package-dir={}'.format(args.package_dir)
+
+    toolchains = ALL_TOOLCHAINS
+    if args.toolchain is not None:
+        toolchains = [args.toolchain]
+
+    host = args.host
+    if host is None:
+        host = get_default_host()
+
+    mingw_arg = ''
+    if host in ('windows', 'windows64'):
+        mingw_arg = '--mingw'
+
+    try_64_arg = '--try-64'
+    if host == 'windows':
+        try_64_arg = '--try-64'
+
+    ndk_build_tools_path = android_path('prebuilts/ndk/current/build/tools')
+    build_env = dict(os.environ)
+    build_env['NDK_BUILDTOOLS_PATH'] = ndk_build_tools_path
+    build_env['ANDROID_NDK_ROOT'] = ndk_path
+
+    print('Building {} toolchains: {}'.format(host, ' '.join(toolchains)))
+    for toolchain in toolchains:
+        toolchain_name = '-'.join([toolchain, GCC_VERSION])
+        build_cmd = [
+            'bash', 'build-gcc.sh', toolchain_path, ndk_path, toolchain_name,
+            package_dir_arg, '--verbose', try_64_arg, mingw_arg,
+            '--with-python=prebuilt', jobs_arg,
+        ]
+
+        subprocess.check_call(build_cmd, env=build_env)
+
+if __name__ == '__main__':
+    main()