Android: Add chrome-specific dynamic linker.

build/java_apk.gypi

 # Copyright (c) 2012 The Chromium 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 file is meant to be included into a target to provide a rule
 # to build Android APKs in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_package_apk',
@@ skipping 30 matching lines @@
 #  native_lib_target - The target_name of the target which generates the final
 #    shared library to be included in this apk. A stripped copy of the
 #    library will be included in the apk.
 #  resource_dir - The directory for resources.
 #  R_package - A custom Java package to generate the resource file R.java in.
 #    By default, the package given in AndroidManifest.xml will be used.
 #  java_strings_grd - The name of the grd file from which to generate localized
 #    strings.xml files, if any.
 #  library_manifest_paths'- Paths to additional AndroidManifest.xml files from
 #    libraries.
+#  use_chrome_linker - Enable the chrome dynamic linker that allows sharing the
+#    RELRO section of the native libraries between the different processes.
 
 {
   'variables': {
     'additional_input_paths': [],
     'input_jars_paths': [],
     'library_dexed_jars_paths': [],
     'additional_src_dirs': [],
     'generated_src_dirs': [],
     'app_manifest_version_name%': '<(android_app_version_name)',
     'app_manifest_version_code%': '<(android_app_version_code)',
@@ skipping 48 matching lines @@
     'incomplete_apk_path': '<(intermediate_dir)/<(apk_name)-incomplete.apk',
     'source_dir': '<(java_in_dir)/src',
     'apk_install_record': '<(intermediate_dir)/apk_install.record.stamp',
     'device_intermediate_dir': '/data/local/tmp/chromium/<(_target_name)/<(CONFIGURATION_NAME)',
     'symlink_script_host_path': '<(intermediate_dir)/create_symlinks.sh',
     'symlink_script_device_path': '<(device_intermediate_dir)/create_symlinks.sh',
     'create_standalone_apk%': 1,
     'variables': {
       'variables': {
         'native_lib_target%': '',
+        'use_chrome_linker%': 0,
       },
       'conditions': [
         ['gyp_managed_install == 1 and native_lib_target != ""', {
           'unsigned_standalone_apk_path': '<(intermediate_dir)/<(apk_name)-standalone-unsigned.apk',
         }, {
           'unsigned_standalone_apk_path': '<(unsigned_apk_path)',
         }],
         ['gyp_managed_install == 1', {
           'apk_package_native_libs_dir': '<(intermediate_dir)/libs.managed',
         }, {
           'apk_package_native_libs_dir': '<(intermediate_dir)/libs',
         }],
       ],
     },
     'native_lib_target%': '',
+    'use_chrome_linker%': 0,
     'emma_instrument': '<(emma_coverage)',
     'apk_package_native_libs_dir': '<(apk_package_native_libs_dir)',
     'unsigned_standalone_apk_path': '<(unsigned_standalone_apk_path)',
   },
   # Pass the jar path to the apk's "fake" jar target.  This would be better as
   # direct_dependent_settings, but a variable set by a direct_dependent_settings
   # cannot be lifted in a dependent to all_dependent_settings.
   'all_dependent_settings': {
     'variables': {
       'apk_output_jar_path': '<(PRODUCT_DIR)/lib.java/<(jar_name)',
@@ skipping 12 matching lines @@
         'additional_res_dirs': ['<(DEPTH)/build/android/ant/empty/res'],
         'additional_res_packages': ['<(R_package)'],
         'additional_R_text_files': ['<(PRODUCT_DIR)/<(package_name)/R.txt'],
       },
     }],
     ['native_lib_target != "" and component == "shared_library"', {
       'dependencies': [
         '<(DEPTH)/build/android/setup.gyp:copy_system_libraries',
       ],
     }],
+    ['use_chrome_linker == 1', {
+      'dependencies': [
+        '<(DEPTH)/content/content.gyp:content_android_linker',
+      ],
+    }],
     ['native_lib_target != ""', {
       'variables': {
         'compile_input_paths': [ '<(native_libraries_java_stamp)' ],
         'generated_src_dirs': [ '<(native_libraries_java_dir)' ],
         'native_libs_paths': [
           '<(SHARED_LIB_DIR)/<(native_lib_target).>(android_product_extension)'
         ],
         'package_input_paths': [
           '<(apk_package_native_libs_dir)/<(android_app_abi)/gdbserver',
         ],
       },
       'copies': [
         {
           # gdbserver is always copied into the APK's native libs dir. The ant
           # build scripts (apkbuilder task) will only include it in a debug
           # build.
           'destination': '<(apk_package_native_libs_dir)/<(android_app_abi)',
           'files': [
             '<(android_gdbserver)',
           ],
         },
       ],
       'actions': [
         {
           'variables': {
-            'input_libraries': ['<@(native_libs_paths)'],
+            'conditions': [
+              ['use_chrome_linker == 1', {
+                'variables': {
+                  'linker_input_libraries': [
+                    '<(PRODUCT_DIR)/lib/libcontent_android_linker.>(android_product_extension)',
+                  ],
+                }
+              }, {
+                'variables': {
+                  'linker_input_libraries': [],
+                },
+              }],
+            ],
+            'input_libraries': [
+              '<@(native_libs_paths)',
+              '<@(linker_input_libraries)',
+            ],
           },
           'includes': ['../build/android/write_ordered_libraries.gypi'],
         },
         {
           'action_name': 'native_libraries_template_data_<(_target_name)',
           'message': 'Creating native_libraries_list.h for <(_target_name).',
           'inputs': [
             '<(DEPTH)/build/android/gyp/util/build_utils.py',
             '<(DEPTH)/build/android/gyp/create_native_libraries_header.py',
             '<(ordered_libraries_file)',
           ],
           'outputs': [
             '<(native_libraries_template_data_stamp)',
           ],
           'action': [
             'python', '<(DEPTH)/build/android/gyp/create_native_libraries_header.py',
             '--ordered-libraries=<(ordered_libraries_file)',
             '--output=<(native_libraries_template_data_file)',
             '--stamp=<(native_libraries_template_data_stamp)',
           ],
         },
         {
           'action_name': 'native_libraries_<(_target_name)',
+          'variables': {
+            'conditions': [
+              ['use_chrome_linker == 1', {
+                'variables': {
+                  'additional_gcc_preprocess_defines': [
+                    '-D', 'ENABLE_CHROME_LINKER',
+                  ],
+                }
+              }, {
+                'variables': {
+                  'additional_gcc_preprocess_defines': [],
+                },
+              }],
+            ],
+            'gcc_preprocess_defines': [
+              '<@(additional_gcc_preprocess_defines)',
+            ],
+          },
           'message': 'Creating NativeLibraries.java for <(_target_name).',
           'inputs': [
             '<(DEPTH)/build/android/gyp/util/build_utils.py',
             '<(DEPTH)/build/android/gyp/gcc_preprocess.py',
             '<(native_libraries_template_data_stamp)',
             '<(native_libraries_template)',
           ],
           'outputs': [
             '<(native_libraries_java_stamp)',
           ],
           'action': [
             'python', '<(DEPTH)/build/android/gyp/gcc_preprocess.py',
             '--include-path=<(native_libraries_template_data_dir)',
             '--output=<(native_libraries_java_file)',
             '--template=<(native_libraries_template)',
             '--stamp=<(native_libraries_java_stamp)',
+            '<@(gcc_preprocess_defines)',
           ],
         },
         {
           'action_name': 'strip_native_libraries',
           'variables': {
             'ordered_libraries_file%': '<(ordered_libraries_file)',
             'stripped_libraries_dir': '<(libraries_source_dir)',
             'input_paths': ['<@(native_libs_paths)'],
             'stamp': '<(strip_stamp)'
           },
@@ skipping 429 matching lines @@
         '<(DEPTH)/build/android/ant/apk-package.xml',
 
         # Add list of inputs to the command line, so if inputs change
         # (e.g. if a Java file is removed), the command will be re-run.
         # TODO(newt): remove this once crbug.com/177552 is fixed in ninja.
         '-DTHIS_IS_IGNORED=>!(echo \'>(_inputs)\' | md5sum)',
       ]
     },
   ],
 }