Create builds configured for ARM and AARCH64.

tools/relocation_packer/relocation_packer.gyp

 # Copyright 2014 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.
 
 {
+  'variables': {
+    'target_define%': 'TARGET_UNSUPPORTED',
+    'conditions': [
+      [ 'target_arch == "arm"', {
+        'target_define': 'TARGET_ARM',
+      }],
+      [ 'target_arch == "arm64"', {
+        'target_define': 'TARGET_ARM64',
+      }],
+    ],
+  },
   'targets': [
     {
       'target_name': 'lib_relocation_packer',
       'toolsets': ['host'],
       'type': 'static_library',
+      'defines': [
+        '<(target_define)',
+      ],
       'dependencies': [
         '../../third_party/elfutils/elfutils.gyp:libelf',
       ],
       'sources': [
         'src/debug.cc',
         'src/elf_file.cc',
         'src/leb128.cc',
         'src/packer.cc',
         'src/run_length_encoder.cc',
       ],
     },
     {
       'target_name': 'relocation_packer',
       'toolsets': ['host'],
       'type': 'executable',
+      'defines': [
+        '<(target_define)',
+      ],
       'dependencies': [
         '../../third_party/elfutils/elfutils.gyp:libelf',
         'lib_relocation_packer',
       ],
       'sources': [
         'src/main.cc',
       ],
     },
     {
       'target_name': 'relocation_packer_unittests',
       'toolsets': ['host'],
       'type': 'executable',
+      'defines': [
+        '<(target_define)',
+      ],
       'cflags': [
         '-DINTERMEDIATE_DIR="<(INTERMEDIATE_DIR)"',
       ],
       'dependencies': [
         '../../testing/gtest.gyp:gtest',
         'lib_relocation_packer',
       ],
       'include_dirs': [
         '../..',
       ],
@@ skipping 10 matching lines @@
           'destination': '<(INTERMEDIATE_DIR)',
           'files': [
             'test_data/elf_file_unittest_relocs.so',
             'test_data/elf_file_unittest_relocs_packed.so',
           ],
         },
       ],
     },
   ],
 }