Simplifies standalone VM Android build.

tools/gyp/configurations_android.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Definitions for building standalone Dart 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',
-    'android_target_arch' : 'x86',
+    'android_ndk_root': '<(PRODUCT_DIR)/../../third_party/android_tools/ndk',
   },  # variables
   'target_defaults': {
-    'defines': [
-      'ANDROID',
-    ],
     'configurations': {
-      'Dart_Debug': {
+      # It is very important to get the order of the linker arguments correct.
+      # Therefore, we put them all in the architecture specific configurations,
+      # even though there are many flags in common, to avoid splitting them
+      # between two configurations and possibly accidentally mixing up the
+      # order.
+      'Dart_Android_Base': {
+        'abstract': 1,
+        'cflags': [ '-Wno-abi', '-Wall', '-W', '-Wno-unused-parameter',
+                    '-Wnon-virtual-dtor', '-fno-rtti', '-fno-exceptions',],
+        'target_conditions': [
+          ['_toolset=="target"', {
+            'defines': [
+              'ANDROID',
+              'USE_STLPORT=1',
+              '_STLP_USE_PTR_SPECIALIZATIONS=1',
+              '_STLP_NO_CSTD_FUNCTION_IMPORTS=1',
+              'HAVE_OFF64_T',
+              'HAVE_SYS_UIO_H',
+            ],
+            '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',
+            ],
+          }],
+          # Settings for building host targets using the system toolchain.
+          ['_toolset=="host"', {
+            'cflags': [ '-m32', '-pthread' ],
+          }],
+        ],
+      },
+      'Dart_Android_Debug': {
+        'abstract': 1,
         'defines': [
           'DEBUG',
         ],
       },
-      'Dart_Release': {
+      'Dart_Android_Release': {
+        'abstract': 1,
         'defines': [
           'NDEBUG',
         ],
         'cflags!': [
           '-O2',
           '-Os',
         ],
         'cflags': [
           '-fdata-sections',
           '-ffunction-sections',
           '-fno-omit-frame-pointer',
           '-O3',
         ],
       },
-    },  # 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',
-          # Note: This include is in cflags to ensure that it comes after
-          # all of the includes.
-          '-I<(android_ndk_include)',
-        ],
-        'defines': [
-          'ANDROID',
-          'USE_STLPORT=1',
-          '_STLP_USE_PTR_SPECIALIZATIONS=1',
-          '_STLP_NO_CSTD_FUNCTION_IMPORTS=1',
-          'HAVE_OFF64_T',
-          'HAVE_SYS_UIO_H',
-        ],
-        '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.
-            # this picks up compiler-dependent math intrinsics.
-            '<!(${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',
-            ],
-          }],
-          # 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"', {
+      'Dart_Android_ia32_Base': {
+        'abstract': 1,
+        'variables': {
+          'android_sysroot': '<(android_ndk_root)/platforms/android-14/arch-x86',
+          'android_ndk_include': '<(android_sysroot)/usr/include',
+          'android_ndk_lib': '<(android_sysroot)/usr/lib',
+        },
+        'target_conditions': [
+          ['_toolset=="target"', {
             # The x86 toolchain currently has problems with stack-protector.
             'cflags!': [
               '-fstack-protector',
             ],
             'cflags': [
+              '-I<(android_ndk_include)',
+              '-I<(android_ndk_root)/sources/cxx-stl/stlport/stlport',
               '-fno-stack-protector',
             ],
-          }],
-        ],
-        'target_conditions': [
-          ['_type=="executable"', {
+            'target_conditions': [
+              ['_type=="executable"', {
+                'ldflags!': ['-Wl,--exclude-libs=ALL,-shared',],
+              }],
+              ['_type=="shared_library"', {
+                'ldflags': ['-Wl,-shared,-Bsymbolic',],
+              }],
+            ],
             'ldflags': [
+              'ia32', '>(_type)', 'target',
+              '-nostdlib',
+              '-Wl,--no-undefined',
+              # Don't export symbols from statically linked libraries.
+              '-Wl,--exclude-libs=ALL',
+              '-Wl,-rpath-link=<(android_ndk_lib)',
+              '-L<(android_ndk_lib)',
+              # 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.
+              '-L<(android_ndk_root)/sources/cxx-stl/stlport/libs/x86',
+              '-z',
+              'muldefs',
               '-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',
+            ],
+            'ldflags!': [
+              '-pthread',  # Not supported by Android toolchain.
+            ],
+          }],
+          ['_toolset=="host"', {
+            'ldflags': [ '-m32', '-pthread' ],
+          }],
+        ],
+      },
+      'Dart_Android_arm_Base': {
+        'abstract': 1,
+        'variables': {
+          'android_sysroot': '<(android_ndk_root)/platforms/android-14/arch-arm',
+          'android_ndk_include': '<(android_sysroot)/usr/include',
+          'android_ndk_lib': '<(android_sysroot)/usr/lib',
+        },
+        'target_conditions': [
+          ['_toolset=="target"', {
+            'cflags': [
+              '-I<(android_ndk_include)',
+              '-I<(android_ndk_root)/sources/cxx-stl/stlport/stlport',
+              '-march=armv7-a',
+              '-mtune=cortex-a8',
+              '-mfpu=vfp3',
+              '-mfloat-abi=softfp',
+            ],
+            'target_conditions': [
+              ['_type=="executable"', {
+                'ldflags!': ['-Wl,--exclude-libs=ALL,-shared',],
+              }],
+              ['_type=="shared_library"', {
+                'ldflags': ['-Wl,-shared,-Bsymbolic',],
+              }],
+            ],
+            'ldflags': [
+              'arm', '>(_type)', 'target',
+              '-nostdlib',
+              '-Wl,--no-undefined',
+              # Don't export symbols from statically linked libraries.
+              '-Wl,--exclude-libs=ALL',
+              '-Wl,-rpath-link=<(android_ndk_lib)',
+              '-L<(android_ndk_lib)',
+              # Enable identical code folding to reduce size.
+              '-Wl,--icf=safe',
+              '-L<(android_ndk_root)/sources/cxx-stl/stlport/libs/armeabi-v7a',
+              '-z',
+              'muldefs',
+              '-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',
+            'ldflags!': [
+              '-pthread',  # Not supported by Android toolchain.
             ],
           }],
-          ['_type=="shared_library"', {
-            'ldflags': [
-              '-Wl,-shared,-Bsymbolic',
-            ],
+          ['_toolset=="host"', {
+            'ldflags': [ '-m32', '-pthread' ],
           }],
         ],
-      }],  # _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
+      },
+    },  # configurations
   },  # target_defaults
 }