Add support for building the Dart VM for Android OS.

tools/gyp/android.gypi

+# Copyright 2012 the V8 project authors. All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#     * Neither the name of Google Inc. nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Definitions for building standalone V8 binaries to run on Android.
+# This is mostly excerpted from:
+# http://src.chromium.org/viewvc/chrome/trunk/src/build/common.gypi
+
+{
+  'variables': {
+    # Location of Android NDK.
+    'variables': {
+      'variables': {
+        'android_ndk_root%': '<!(/bin/echo -n $ANDROID_NDK_ROOT)',
+
+        # Switch between different build types, currently only '0' is
+        # supported.
+        'android_build_type%': 0,
+      },
+      'android_ndk_root%': '<(android_ndk_root)',
+      'android_ndk_sysroot': '<(android_ndk_root)/platforms/android-9/arch-<(android_target_arch)',
+      'android_build_type%': '<(android_build_type)',
+    },
+    'android_ndk_root%': '<(android_ndk_root)',
+    'android_ndk_sysroot': '<(android_ndk_sysroot)',
+    'android_ndk_include': '<(android_ndk_sysroot)/usr/include',
+    'android_ndk_lib': '<(android_ndk_sysroot)/usr/lib',
+    # Enable to use the system stlport, otherwise statically
+    # link the NDK one?
+    'use_system_stlport%': '<(android_build_type)',
+    'android_stlport_library': 'stlport_static',
+    # Copy it out one scope.
+    'android_build_type%': '<(android_build_type)',
+
+    'OS': 'android',
+  },  # variables
+  'target_defaults': {
+    'defines': [
+      'ANDROID',
+      'V8_ANDROID_LOG_STDOUT',
+    ],
+    'configurations': {
+      'Release': {
+        'cflags!': [
+          '-O2',
+          '-Os',
+        ],
+        'cflags': [
+          '-fdata-sections',
+          '-ffunction-sections',
+          '-fomit-frame-pointer',
+          '-O3',
+        ],
+      },  # Release
+    },  # configurations
+    'cflags': [ '-Wno-abi', '-Wall', '-W', '-Wno-unused-parameter',
+                '-Wnon-virtual-dtor', '-fno-rtti', '-fno-exceptions', ],
+    'target_conditions': [
+      ['_toolset=="target"', {
+        'cflags!': [
+          '-pthread',  # Not supported by Android toolchain.
+        ],
+        'cflags': [
+          '-U__linux__',  # Don't allow toolchain to claim -D__linux__
+          '-ffunction-sections',
+          '-funwind-tables',
+          '-fstack-protector',
+          '-fno-short-enums',
+          '-finline-limit=64',
+          '-Wa,--noexecstack',
+          '-Wno-error=non-virtual-dtor',  # TODO(michaelbai): Fix warnings.
+          # Note: This include is in cflags to ensure that it comes after
+          # all of the includes.
+          '-I<(android_ndk_include)',
+        ],
+        'defines': [
+          'ANDROID',
+          #'__GNU_SOURCE=1',  # Necessary for clone()
+          'USE_STLPORT=1',
+          '_STLP_USE_PTR_SPECIALIZATIONS=1',
+          'HAVE_OFF64_T',
+          'HAVE_SYS_UIO_H',
+          'ANDROID_BINSIZE_HACK', # Enable temporary hacks to reduce binsize.
+        ],
+        'ldflags!': [
+          '-pthread',  # Not supported by Android toolchain.
+        ],
+        'ldflags': [
+          '-nostdlib',
+          '-Wl,--no-undefined',
+          # Don't export symbols from statically linked libraries.
+          '-Wl,--exclude-libs=ALL',
+        ],
+        'libraries!': [
+            '-lrt',  # librt is built into Bionic.
+            # Not supported by Android toolchain.
+            # Where do these come from?  Can't find references in
+            # any Chromium gyp or gypi file.  Maybe they come from
+            # gyp itself?
+            '-lpthread', '-lnss3', '-lnssutil3', '-lsmime3', '-lplds4', '-lplc4', '-lnspr4',
+          ],
+          'libraries': [
+            '-l<(android_stlport_library)',
+            # Manually link the libgcc.a that the cross compiler uses.
+            '<!(${ANDROID_TOOLCHAIN}/*-gcc -print-libgcc-file-name)',
+            '-lc',
+            '-ldl',
+            '-lstdc++',
+            '-lm',
+        ],
+        'conditions': [
+          ['android_build_type==0', {
+            'ldflags': [
+              '-Wl,-rpath-link=<(android_ndk_lib)',
+              '-L<(android_ndk_lib)',
+            ],
+          }],
+          ['target_arch == "arm"', {
+            'ldflags': [
+              # Enable identical code folding to reduce size.
+              '-Wl,--icf=safe',
+            ],
+          }],
+          ['target_arch=="arm" and armv7==1', {
+            'cflags': [
+              '-march=armv7-a',
+              '-mtune=cortex-a8',
+              '-mfpu=vfp3',
+            ],
+          }],

[cshapiro, 2012/08/07 22:39:40]

No cflags for x86 on android?  There are some preferred ones in the x86 abi
specification (well, at least they were there when I reviewed it).

[jackpal, 2012/08/08 00:26:19]

This file comes mostly-unchanged from the v8 build.

I guess people aren't optimizing for x86 at the moment.

+          # NOTE: The stlport header include paths below are specified in
+          # cflags rather than include_dirs because they need to come
+          # after include_dirs. Think of them like system headers, but
+          # don't use '-isystem' because the arm-linux-androideabi-4.4.3
+          # toolchain (circa Gingerbread) will exhibit strange errors.
+          # The include ordering here is important; change with caution.
+          ['use_system_stlport==0', {
+            'cflags': [
+              '-I<(android_ndk_root)/sources/cxx-stl/stlport/stlport',
+            ],
+            'conditions': [
+              ['target_arch=="arm" and armv7==1', {
+                'ldflags': [
+                  '-L<(android_ndk_root)/sources/cxx-stl/stlport/libs/armeabi-v7a',
+                ],
+              }],
+              ['target_arch=="arm" and armv7==0', {
+                'ldflags': [
+                  '-L<(android_ndk_root)/sources/cxx-stl/stlport/libs/armeabi',
+                ],
+              }],
+              ['target_arch=="ia32"', {
+                'ldflags': [
+                  '-L<(android_ndk_root)/sources/cxx-stl/stlport/libs/x86',
+                ],
+              }],
+            ],
+          }],
+          ['target_arch=="ia32"', {
+            # The x86 toolchain currently has problems with stack-protector.
+            'cflags!': [
+              '-fstack-protector',
+            ],
+            'cflags': [
+              '-fno-stack-protector',
+            ],
+          }],
+        ],
+        'target_conditions': [
+          ['_type=="executable"', {
+            'ldflags': [
+              '-Bdynamic',
+              '-Wl,-dynamic-linker,/system/bin/linker',
+              '-Wl,--gc-sections',
+              '-Wl,-z,nocopyreloc',
+              # crtbegin_dynamic.o should be the last item in ldflags.
+              '<(android_ndk_lib)/crtbegin_dynamic.o',
+            ],
+            'libraries': [
+              # crtend_android.o needs to be the last item in libraries.
+              # Do not add any libraries after this!
+              '<(android_ndk_lib)/crtend_android.o',
+            ],
+          }],
+          ['_type=="shared_library"', {
+            'ldflags': [
+              '-Wl,-shared,-Bsymbolic',
+            ],
+          }],
+        ],
+      }],  # _toolset=="target"
+      # Settings for building host targets using the system toolchain.
+      ['_toolset=="host"', {
+        'cflags': [ '-m32', '-pthread' ],
+        'ldflags': [ '-m32', '-pthread' ],
+        'ldflags!': [
+          '-Wl,-z,noexecstack',
+          '-Wl,--gc-sections',
+          '-Wl,-O1',
+          '-Wl,--as-needed',
+        ],
+      }],
+    ],  # target_conditions
+  },  # target_defaults
+}