Simplifies standalone VM Android build.

tools/android_link.py

+#!/usr/bin/env python
+
+# Copyright (c) 2012 The Dart Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+This script performs the final link step for Android NDK executables.
+Usage:
+./android_link {arm,ia32} {executable,library,shared_library} {host,target}
+               [linker args]
+"""
+
+import optparse
+import os
+import subprocess
+import sys
+
+# Figure out where we are.
+SCRIPT_DIR = os.path.dirname(sys.argv[0])
+DART_ROOT = os.path.realpath(os.path.join(SCRIPT_DIR, '..'))
+THIRD_PARTY_ROOT = os.path.join(DART_ROOT, 'third_party')
+
+
+def CheckDirExists(path, docstring):
+  if not os.path.isdir(path):
+    raise Exception('Could not find %s directory %s'
+          % (docstring, path))
+
+
+def execute(args):
+  process = subprocess.Popen(args)
+  process.wait()
+  return process.returncode
+
+
+def main():
+  if len(sys.argv) < 5:
+    raise Exception(sys.argv[0] + " failed: not enough arguments")
+
+  # gyp puts -shared first in a shared_library link. Remove it.
+  if sys.argv[1] == '-shared':
+    sys.argv.remove('-shared')
+
+  # Grab the command line arguments.
+  target_arch = sys.argv[1]
+  link_type = sys.argv[2]
+  link_target = sys.argv[3]
+  link_args = sys.argv[4:]
+
+  # Check arguments.
+  if target_arch not in ['arm', 'ia32']:
+    raise Exception(sys.argv[0] + " first argument must be 'arm' or 'ia32'")
+  if link_type not in ['executable', 'library', 'shared_library']:
+    raise Exception(sys.argv[0] +
+                    " second argument must be 'executable' or 'library'")
+  if link_target not in ['host', 'target']:
+    raise Exception(sys.argv[0] + " third argument must be 'host' or 'target'")
+
+  # TODO(zra): Figure out how to link a shared library with the NDK
+  # cross-compilers. For now, we disable it by generating empty files
+  # for the results. We disable it here to avoid inspecting the OS type in
+  # the gyp files.
+  if link_type == 'shared_library':
+    print "NOT linking shared library for Android."
+    o_index = link_args.index('-o')
+    output = os.path.join(DART_ROOT, link_args[o_index + 1])
+    open(output, 'a').close()
+    sys.exit(0)
+
+  # Set up path to the Android NDK.
+  CheckDirExists(THIRD_PARTY_ROOT, 'third party tools');
+  android_tools = os.path.join(THIRD_PARTY_ROOT, 'android_tools')
+  CheckDirExists(android_tools, 'Android tools')
+  android_ndk_root = os.path.join(android_tools, 'ndk')
+  CheckDirExists(android_ndk_root, 'Android NDK')
+
+  # Set up the directory of the Android NDK cross-compiler toolchain.
+  toolchain_arch = 'arm-linux-androideabi-4.6'
+  if target_arch == 'ia32':
+    toolchain_arch = 'x86-4.6'
+  toolchain_dir = 'linux-x86'
+  android_toolchain = os.path.join(android_ndk_root,
+      'toolchains', toolchain_arch,
+      'prebuilt', toolchain_dir, 'bin')
+  CheckDirExists(android_toolchain, 'Android toolchain')
+
+  # Set up the path to the linker executable.
+  android_linker = os.path.join(android_toolchain, 'arm-linux-androideabi-g++')
+  if target_arch == 'ia32':
+    android_linker = os.path.join(android_toolchain, 'i686-linux-android-g++')
+
+  # Grab the path to libgcc.a, which we must explicitly add to the link,
+  # by invoking the cross-compiler with the -print-libgcc-file-name flag.
+  android_gcc = os.path.join(android_toolchain, 'arm-linux-androideabi-gcc')
+  if target_arch == 'ia32':
+    android_gcc = os.path.join(android_toolchain, 'i686-linux-android-gcc')
+  android_libgcc = subprocess.check_output(
+      [android_gcc, '-print-libgcc-file-name']).strip()
+
+  # Set up the path to the system root directory, which is where we'll find the
+  # Android specific system includes and libraries.
+  android_ndk_sysroot = os.path.join(android_ndk_root,
+      'platforms', 'android-14', 'arch-arm')
+  if target_arch == 'ia32':
+    android_ndk_sysroot = os.path.join(android_ndk_root,
+        'platforms', 'android-14', 'arch-x86')
+  CheckDirExists(android_ndk_sysroot, 'Android sysroot')
+  android_ndk_lib = os.path.join(android_ndk_sysroot,'usr','lib')
+  android_ndk_include = os.path.join(android_ndk_sysroot, 'usr', 'include')
+  crtend_android = os.path.join(android_ndk_lib, 'crtend_android.o')
+
+  if link_target == 'target':
+    # Add and remove libraries as listed in configurations_android.gypi
+    libs_to_rm = ['-lrt', '-lpthread', '-lnss3', '-lnssutil3', '-lsmime3',
+                  '-lplds4', '-lplc4', '-lnspr4',]
+    libs_to_add = ['-lstlport_static', android_libgcc, '-lc', '-ldl',
+                   '-lstdc++', '-lm',]
+
+    # Add crtend_android to end if we are linking an executable.
+    if link_type == 'executable':
+      libs_to_add.extend(['-llog', '-lz', crtend_android])
+
+    link_args = [i for i in link_args if i not in libs_to_rm]
+    link_args.extend(libs_to_add)
+
+    link_args.insert(0, android_linker)
+  else:
+    link_args.extend(['-ldl', '-lrt'])
+    link_args.insert(0, 'g++')
+
+  sys.exit(execute(link_args))
+
+if __name__ == '__main__':
+  main()