Linux: restore the option to build with system libvpx

libvpx.gyp

 # 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.
 {
   'variables': {
-    'conditions': [
-      ['os_posix==1', {
-        'asm_obj_extension': 'o',
-      }],
-      ['OS=="win"', {
-        'asm_obj_extension': 'obj',
-      }],
-
-      ['target_arch=="arm" and arm_neon==1', {
-        'target_arch_full': 'arm-neon',
-      }, {
-        'target_arch_full': '<(target_arch)',
-      }],
-
-      # Conversion to libvpx arch names.
-      ['target_arch=="arm" and arm_neon==1', {
-        'libvpx_arch': 'armv7',
-      }],
-      ['target_arch=="arm" and arm_neon==0', {
-        'libvpx_arch': 'armv6',
-      }],
-      ['target_arch=="ia32"', {
-        'libvpx_arch': 'x86',
-      }],
-      ['target_arch=="x64"', {
-        'libvpx_arch': 'x86_64',
-      }],
-
-      ['os_posix == 1 and OS != "mac"', {
-        'OS_CATEGORY%': 'linux',
-      }, {
-        'OS_CATEGORY%': '<(OS)',
-      }],
-    ],
-
-    # Location of the intermediate output.
-    'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/libvpx',
-
-    # Override temporarily until we get a warning-free libvpx on Windows.
-    # See http://crbug.com/140121
-    'win_third_party_warn_as_error': 'false',
+    'use_system_libvpx%': 0,
   },
-
   'conditions': [
-    [ 'target_arch != "arm" and target_arch != "mipsel"', {
+    ['use_system_libvpx==0', {
+      'variables': {
+        'conditions': [
+          ['os_posix==1', {
+            'asm_obj_extension': 'o',
+          }],
+          ['OS=="win"', {
+            'asm_obj_extension': 'obj',
+          }],
+
+          ['target_arch=="arm" and arm_neon==1', {
+            'target_arch_full': 'arm-neon',
+          }, {
+            'target_arch_full': '<(target_arch)',
+          }],
+
+          # Conversion to libvpx arch names.
+          ['target_arch=="arm" and arm_neon==1', {
+            'libvpx_arch': 'armv7',
+          }],
+          ['target_arch=="arm" and arm_neon==0', {
+            'libvpx_arch': 'armv6',
+          }],
+          ['target_arch=="ia32"', {
+            'libvpx_arch': 'x86',
+          }],
+          ['target_arch=="x64"', {
+            'libvpx_arch': 'x86_64',
+          }],
+
+          ['os_posix == 1 and OS != "mac"', {
+            'OS_CATEGORY%': 'linux',
+          }, {
+            'OS_CATEGORY%': '<(OS)',
+          }],
+        ],
+
+        # Location of the intermediate output.
+        'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/libvpx',
+
+        # Override temporarily until we get a warning-free libvpx on Windows.
+        # See http://crbug.com/140121
+        'win_third_party_warn_as_error': 'false',
+      },
+
+      'conditions': [
+        [ 'target_arch != "arm" and target_arch != "mipsel"', {
+          'targets': [
+            {
+              # This libvpx target contains both encoder and decoder.
+              # Encoder is configured to be realtime only.
+              'target_name': 'libvpx',
+              'type': 'static_library',
+              'variables': {
+                'yasm_output_path': '<(SHARED_INTERMEDIATE_DIR)/third_party/libvpx',
+                'OS_CATEGORY%': '<(OS_CATEGORY)',
+                'yasm_flags': [
+                  '-D', 'CHROMIUM',
+                  '-I', 'source/config/<(OS_CATEGORY)/<(target_arch)',
+                  '-I', 'source/config',
+                  '-I', 'source/libvpx',
+                  '-I', '<(shared_generated_dir)', # Generated assembly offsets
+                ],
+              },
+              'dependencies': [
+                'gen_asm_offsets',
+              ],
+              'includes': [
+                '../yasm/yasm_compile.gypi'
+              ],
+              'include_dirs': [
+                'source/config/<(OS_CATEGORY)/<(target_arch)',
+                'source/config',
+                'source/libvpx',
+                'source/libvpx/vp8/common',
+                'source/libvpx/vp8/decoder',
+                'source/libvpx/vp8/encoder',
+                '<(shared_generated_dir)', # Provides vpx_rtcd.h.
+              ],
+              'direct_dependent_settings': {
+                'include_dirs': [
+                  'source/libvpx',
+                ],
+              },
+              # VS2010 does not correctly incrementally link obj files generated
+              # from asm files. This flag disables UseLibraryDependencyInputs to
+              # avoid this problem.
+              'msvs_2010_disable_uldi_when_referenced': 1,
+              'conditions': [
+                [ 'target_arch=="ia32"', {
+                  'includes': [
+                    'libvpx_srcs_x86.gypi',
+                  ],
+                }],
+                [ 'target_arch=="x64"', {
+                  'includes': [
+                    'libvpx_srcs_x86_64.gypi',
+                  ],
+                }],
+                ['clang == 1', {
+                  'xcode_settings': {
+                    'WARNING_CFLAGS': [
+                      # libvpx heavily relies on implicit enum casting.
+                      '-Wno-conversion',
+                      # libvpx does `if ((a == b))` in some places.
+                      '-Wno-parentheses-equality',
+                    ],
+                  },
+                  'cflags': [
+                    '-Wno-conversion',
+                    '-Wno-parentheses-equality',
+                  ],
+                }],
+                [ 'chromeos == 1', {
+                  # ChromeOS needs these files for animated WebM avatars.
+                  'sources': [
+                    'source/libvpx/libmkv/EbmlIDs.h',
+                    'source/libvpx/libmkv/EbmlWriter.c',
+                    'source/libvpx/libmkv/EbmlWriter.h',
+                  ],
+                }],
+              ],
+            },
+          ],
+        },
+        ],
+        # 'libvpx' target for mips builds.
+        [ 'target_arch=="mipsel" ', {
+          'targets': [
+            {
+              # This libvpx target contains both encoder and decoder.
+              # Encoder is configured to be realtime only.
+              'target_name': 'libvpx',
+              'type': 'static_library',
+              'variables': {
+                'shared_generated_dir':
+                  '<(SHARED_INTERMEDIATE_DIR)/third_party/libvpx',
+              },
+              'includes': [
+                'libvpx_srcs_mips.gypi',
+              ],
+              'cflags': [
+                '-EL -static -mips32',
+              ],
+              'include_dirs': [
+                'source/config/<(OS)/<(target_arch)',
+                'source/config',
+                'source/libvpx',
+                'source/libvpx/vp8/common',
+                'source/libvpx/vp8/decoder',
+                'source/libvpx/vp8/encoder',
+              ],
+              'direct_dependent_settings': {
+                'include_dirs': [
+                  'source/libvpx',
+                ],
+              },
+              'sources': [
+                'source/config/<(OS)/<(target_arch)/vpx_config.c',
+              ],
+            },
+          ],
+        },
+        ],
+        # 'libvpx' target for ARM builds.
+        [ 'target_arch=="arm" ', {
+          'targets': [
+            {
+              # This libvpx target contains both encoder and decoder.
+              # Encoder is configured to be realtime only.
+              'target_name': 'libvpx',
+              'type': 'static_library',
+              'dependencies': [
+                'gen_asm_offsets',
+              ],
+
+              # Copy the script to the output folder so that we can use it with
+              # absolute path.
+              'copies': [{
+                'destination': '<(shared_generated_dir)',
+                'files': [
+                  '<(ads2gas_script_path)',
+                ],
+              }],
+
+              # Rule to convert .asm files to .S files.
+              'rules': [
+                {
+                  'rule_name': 'convert_asm',
+                  'extension': 'asm',
+                  'inputs': [ '<(shared_generated_dir)/<(ads2gas_script)', ],
+                  'outputs': [
+                    '<(shared_generated_dir)/<(RULE_INPUT_ROOT).S',
+                  ],
+                  'action': [
+                    'bash',
+                    '-c',
+                    'cat <(RULE_INPUT_PATH) | perl <(shared_generated_dir)/<(ads2gas_script) > <(shared_generated_dir)/<(RULE_INPUT_ROOT).S',
+                  ],
+                  'process_outputs_as_sources': 1,
+                  'message': 'Convert libvpx asm file for ARM <(RULE_INPUT_PATH).',
+                },
+              ],
+
+              'variables': {
+                # Location of the assembly conversion script.
+                'ads2gas_script': 'ads2gas.pl',
+                'ads2gas_script_path': 'source/libvpx/build/make/<(ads2gas_script)',
+              },
+              'cflags': [
+                # We need to explicitly tell the GCC assembler to look for
+                # .include directive files from the place where they're
+                # generated to.
+                '-Wa,-I,<!(pwd)/source/config/<(OS_CATEGORY)/<(target_arch_full)',
+                '-Wa,-I,<!(pwd)/source/config',
+                '-Wa,-I,<(shared_generated_dir)',
+              ],
+              'include_dirs': [
+                'source/config/<(OS_CATEGORY)/<(target_arch_full)',
+                'source/config',
+                'source/libvpx',
+              ],
+              'direct_dependent_settings': {
+                'include_dirs': [
+                  'source/libvpx',
+                ],
+              },
+              'conditions': [
+                # Libvpx optimizations for ARMv6 or ARMv7 without NEON.
+                ['arm_neon==0', {
+                  'includes': [
+                    'libvpx_srcs_arm.gypi',
+                  ],
+                }],
+                # Libvpx optimizations for ARMv7 with NEON.
+                ['arm_neon==1', {
+                  'includes': [
+                    'libvpx_srcs_arm_neon.gypi',
+                  ],
+                }],
+                ['OS == "android"', {
+                  'include_dirs': [
+                    '<(android_ndk_include)',
+                    '<(android_ndk_include)/machine',
+                  ],
+                  'defines': [
+                    'ANDROID_CPU_ARM_FEATURE_NEON=4',
+                  ],
+                }],
+                [ 'chromeos == 1', {
+                  # ChromeOS needs these files for animated WebM avatars.
+                  'sources': [
+                    'source/libvpx/libmkv/EbmlIDs.h',
+                    'source/libvpx/libmkv/EbmlWriter.c',
+                    'source/libvpx/libmkv/EbmlWriter.h',
+                  ],
+                }],
+              ],
+            },
+          ],
+        }],
+      ],
       'targets': [
         {
-          # This libvpx target contains both encoder and decoder.
-          # Encoder is configured to be realtime only.
-          'target_name': 'libvpx',
-          'type': 'static_library',
-          'variables': {
-            'yasm_output_path': '<(SHARED_INTERMEDIATE_DIR)/third_party/libvpx',
-            'OS_CATEGORY%': '<(OS_CATEGORY)',
-            'yasm_flags': [
-              '-D', 'CHROMIUM',
-              '-I', 'source/config/<(OS_CATEGORY)/<(target_arch)',
-              '-I', 'source/config',
-              '-I', 'source/libvpx',
-              '-I', '<(shared_generated_dir)', # Generated assembly offsets
-            ],
-          },
-          'dependencies': [
-            'gen_asm_offsets',
-          ],
-          'includes': [
-            '../yasm/yasm_compile.gypi'
-          ],
-          'include_dirs': [
-            'source/config/<(OS_CATEGORY)/<(target_arch)',
-            'source/config',
-            'source/libvpx',
-            'source/libvpx/vp8/common',
-            'source/libvpx/vp8/decoder',
-            'source/libvpx/vp8/encoder',
-            '<(shared_generated_dir)', # Provides vpx_rtcd.h.
-          ],
-          'direct_dependent_settings': {
-            'include_dirs': [
-              'source/libvpx',
-            ],
-          },
-          # VS2010 does not correctly incrementally link obj files generated
-          # from asm files. This flag disables UseLibraryDependencyInputs to
-          # avoid this problem.
-          'msvs_2010_disable_uldi_when_referenced': 1,
-          'conditions': [
-            [ 'target_arch=="ia32"', {
-              'includes': [
-                'libvpx_srcs_x86.gypi',
-              ],
-            }],
-            [ 'target_arch=="x64"', {
-              'includes': [
-                'libvpx_srcs_x86_64.gypi',
-              ],
-            }],
-            ['clang == 1', {
-              'xcode_settings': {
-                'WARNING_CFLAGS': [
-                  # libvpx heavily relies on implicit enum casting.
-                  '-Wno-conversion',
-                  # libvpx does `if ((a == b))` in some places.
-                  '-Wno-parentheses-equality',
-                ],
-              },
-              'cflags': [
-                '-Wno-conversion',
-                '-Wno-parentheses-equality',
-              ],
-            }],
-            [ 'chromeos == 1', {
-              # ChromeOS needs these files for animated WebM avatars.
-              'sources': [
-                'source/libvpx/libmkv/EbmlIDs.h',
-                'source/libvpx/libmkv/EbmlWriter.c',
-                'source/libvpx/libmkv/EbmlWriter.h',
-              ],
-            }],
-          ],
-        },
-      ],
-    },
-    ],
-    # 'libvpx' target for mips builds.
-    [ 'target_arch=="mipsel" ', {
-      'targets': [
-        {
-          # This libvpx target contains both encoder and decoder.
-          # Encoder is configured to be realtime only.
-          'target_name': 'libvpx',
-          'type': 'static_library',
-          'variables': {
-            'shared_generated_dir':
-              '<(SHARED_INTERMEDIATE_DIR)/third_party/libvpx',
-          },
-          'includes': [
-            'libvpx_srcs_mips.gypi',
-          ],
-          'cflags': [
-            '-EL -static -mips32',
-          ],
-          'include_dirs': [
-            'source/config/<(OS)/<(target_arch)',
-            'source/config',
-            'source/libvpx',
-            'source/libvpx/vp8/common',
-            'source/libvpx/vp8/decoder',
-            'source/libvpx/vp8/encoder',
-          ],
-          'direct_dependent_settings': {
-            'include_dirs': [
-              'source/libvpx',
-            ],
-          },
-          'sources': [
-            'source/config/<(OS)/<(target_arch)/vpx_config.c',
-          ],
-        },
-      ],
-    },
-    ],
-    # 'libvpx' target for ARM builds.
-    [ 'target_arch=="arm" ', {
-      'targets': [
-        {
-          # This libvpx target contains both encoder and decoder.
-          # Encoder is configured to be realtime only.
-          'target_name': 'libvpx',
-          'type': 'static_library',
-          'dependencies': [
-            'gen_asm_offsets',
-          ],
-
-          # Copy the script to the output folder so that we can use it with
-          # absolute path.
-          'copies': [{
-            'destination': '<(shared_generated_dir)',
-            'files': [
-              '<(ads2gas_script_path)',
-            ],
-          }],
-
-          # Rule to convert .asm files to .S files.
-          'rules': [
-            {
-              'rule_name': 'convert_asm',
-              'extension': 'asm',
-              'inputs': [ '<(shared_generated_dir)/<(ads2gas_script)', ],
-              'outputs': [
-                '<(shared_generated_dir)/<(RULE_INPUT_ROOT).S',
-              ],
-              'action': [
-                'bash',
-                '-c',
-                'cat <(RULE_INPUT_PATH) | perl <(shared_generated_dir)/<(ads2gas_script) > <(shared_generated_dir)/<(RULE_INPUT_ROOT).S',
-              ],
-              'process_outputs_as_sources': 1,
-              'message': 'Convert libvpx asm file for ARM <(RULE_INPUT_PATH).',
-            },
-          ],
-
-          'variables': {
-            # Location of the assembly conversion script.
-            'ads2gas_script': 'ads2gas.pl',
-            'ads2gas_script_path': 'source/libvpx/build/make/<(ads2gas_script)',
-          },
-          'cflags': [
-            # We need to explicitly tell the GCC assembler to look for
-            # .include directive files from the place where they're
-            # generated to.
-            '-Wa,-I,<!(pwd)/source/config/<(OS_CATEGORY)/<(target_arch_full)',
-            '-Wa,-I,<!(pwd)/source/config',
-            '-Wa,-I,<(shared_generated_dir)',
-          ],
+          # A tool that runs on host to tract integers from object file.
+          'target_name': 'libvpx_obj_int_extract',
+          'type': 'executable',
+          'toolsets': ['host'],
           'include_dirs': [
             'source/config/<(OS_CATEGORY)/<(target_arch_full)',
             'source/config',
             'source/libvpx',
           ],
+          'sources': [
+            'source/libvpx/build/make/obj_int_extract.c',
+          ]
+        },
+        {
+          # A library that contains assembly offsets needed.
+          'target_name': 'libvpx_asm_offsets',
+          'type': 'static_library',
+          'hard_dependency': 1,
+          'include_dirs': [
+            'source/config/<(OS_CATEGORY)/<(target_arch_full)',
+            'source/config',
+            'source/libvpx',
+          ],
+          'conditions': [
+            ['asan==1', {
+              'cflags!': [ '-faddress-sanitizer', ],
+              'xcode_settings': {
+                'OTHER_CFLAGS!': [ '-faddress-sanitizer', ],
+              },
+              'ldflags!': [ '-faddress-sanitizer', ],
+            }],
+          ],
+          'sources': [
+            '<(shared_generated_dir)/vpx_rtcd.h',
+            'source/libvpx/vp8/common/asm_com_offsets.c',
+            'source/libvpx/vp8/decoder/asm_dec_offsets.c',
+            'source/libvpx/vp8/encoder/asm_enc_offsets.c',
+          ],
+        },
+        {
+          # A target that takes assembly offsets library and generate the
+          # corresponding assembly files.
+          # This target is a hard dependency because the generated .asm files
+          # are needed all assembly optimized files in libvpx.
+          'target_name': 'gen_asm_offsets',
+          'type': 'none',
+          'hard_dependency': 1,
+          'dependencies': [
+            'libvpx_asm_offsets',
+            'libvpx_obj_int_extract#host',
+          ],
+          'conditions': [
+            ['OS=="win"', {
+              'variables': {
+                'ninja_obj_dir': '<(PRODUCT_DIR)/obj/third_party/libvpx/source/libvpx/vp8',
+              },
+              'actions': [
+                {
+                  'action_name': 'copy_enc_offsets_obj',
+                  'inputs': [ 'copy_obj.sh' ],
+                  'outputs': [ '<(INTERMEDIATE_DIR)/asm_enc_offsets.obj' ],
+                  'action': [
+                    '<(DEPTH)/third_party/libvpx/copy_obj.sh',
+                    '-d', '<@(_outputs)',
+                    '-s', '<(PRODUCT_DIR)/obj/libvpx_asm_offsets/asm_enc_offsets.obj',
+                    '-s', '<(ninja_obj_dir)/encoder/libvpx_asm_offsets.asm_enc_offsets.obj',
+                  ],
+                  'process_output_as_sources': 1,
+                },
+                {
+                  'action_name': 'copy_dec_offsets_obj',
+                  'inputs': [ 'copy_obj.sh' ],
+                  'outputs': [ '<(INTERMEDIATE_DIR)/asm_dec_offsets.obj' ],
+                  'action': [
+                    '<(DEPTH)/third_party/libvpx/copy_obj.sh',
+                    '-d', '<@(_outputs)',
+                    '-s', '<(PRODUCT_DIR)/obj/libvpx_asm_offsets/asm_dec_offsets.obj',
+                    '-s', '<(ninja_obj_dir)/decoder/libvpx_asm_offsets.asm_dec_offsets.obj',
+                  ],
+                  'process_output_as_sources': 1,
+                },
+                {
+                  'action_name': 'copy_com_offsets_obj',
+                  'inputs': [ 'copy_obj.sh' ],
+                  'outputs': [ '<(INTERMEDIATE_DIR)/asm_com_offsets.obj' ],
+                  'action': [
+                    '<(DEPTH)/third_party/libvpx/copy_obj.sh',
+                    '-d', '<@(_outputs)',
+                    '-s', '<(PRODUCT_DIR)/obj/libvpx_asm_offsets/asm_com_offsets.obj',
+                    '-s', '<(ninja_obj_dir)/common/libvpx_asm_offsets.asm_com_offsets.obj',
+                  ],
+                  'process_output_as_sources': 1,
+                },
+              ],
+              'sources': [
+                '<(INTERMEDIATE_DIR)/asm_com_offsets.obj',
+                '<(INTERMEDIATE_DIR)/asm_dec_offsets.obj',
+                '<(INTERMEDIATE_DIR)/asm_enc_offsets.obj',
+              ],
+            }, {
+              'actions': [
+                {
+                  # Take archived .a file and unpack it unto .o files.
+                  'action_name': 'unpack_lib_posix',
+                  'inputs': [
+                    'unpack_lib_posix.sh',
+                  ],
+                  'outputs': [
+                    '<(INTERMEDIATE_DIR)/asm_com_offsets.o',
+                    '<(INTERMEDIATE_DIR)/asm_dec_offsets.o',
+                    '<(INTERMEDIATE_DIR)/asm_enc_offsets.o',
+                  ],
+                  'action': [
+                    '<(DEPTH)/third_party/libvpx/unpack_lib_posix.sh',
+                    '-d', '<(INTERMEDIATE_DIR)',
+                    '-a', '<(LIB_DIR)/libvpx_asm_offsets.a',
+                    '-a', '<(LIB_DIR)/third_party/libvpx/libvpx_asm_offsets.a',
+                    '-f', 'asm_com_offsets.o',
+                    '-f', 'asm_dec_offsets.o',
+                    '-f', 'asm_enc_offsets.o',
+                  ],
+                  'process_output_as_sources': 1,
+                },
+              ],
+              # Need this otherwise gyp won't run the rule on them.
+              'sources': [
+                '<(INTERMEDIATE_DIR)/asm_com_offsets.o',
+                '<(INTERMEDIATE_DIR)/asm_dec_offsets.o',
+                '<(INTERMEDIATE_DIR)/asm_enc_offsets.o',
+              ],
+            }],
+          ],
+          'rules': [
+            {
+              # Rule to extract integer values for each symbol from an object file.
+              'rule_name': 'obj_int_extract',
+              'extension': '<(asm_obj_extension)',
+              'inputs': [
+                '<(PRODUCT_DIR)/libvpx_obj_int_extract',
+                'obj_int_extract.sh',
+              ],
+              'outputs': [
+                '<(shared_generated_dir)/<(RULE_INPUT_ROOT).asm',
+              ],
+              'variables': {
+                'conditions': [
+                  ['target_arch=="arm"', {
+                    'asm_format': 'gas',
+                  }, {
+                    'asm_format': 'rvds',
+                  }],
+                ],
+              },
+              'action': [
+                '<(DEPTH)/third_party/libvpx/obj_int_extract.sh',
+                '-e', '<(PRODUCT_DIR)/libvpx_obj_int_extract',
+                '-f', '<(asm_format)',
+                '-b', '<(RULE_INPUT_PATH)',
+                '-o', '<(shared_generated_dir)/<(RULE_INPUT_ROOT).asm',
+              ],
+              'message': 'Generate assembly offsets <(RULE_INPUT_PATH).',
+            },
+          ],
+        },
+        {
+          'target_name': 'simple_encoder',
+          'type': 'executable',
+          'dependencies': [
+            'libvpx',
+          ],
+
+          # Copy the script to the output folder so that we can use it with
+          # absolute path.
+          'copies': [{
+            'destination': '<(shared_generated_dir)/simple_encoder',
+            'files': [
+              'source/libvpx/examples/gen_example_code.sh',
+            ],
+          }],
+
+          # Rule to convert .txt files to .c files.
+          'rules': [
+            {
+              'rule_name': 'generate_example',
+              'extension': 'txt',
+              'inputs': [ '<(shared_generated_dir)/simple_encoder/gen_example_code.sh', ],
+              'outputs': [
+                '<(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
+              ],
+              'action': [
+                'bash',
+                '-c',
+                '<(shared_generated_dir)/simple_encoder/gen_example_code.sh <(RULE_INPUT_PATH) > <(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
+              ],
+              'process_outputs_as_sources': 1,
+              'message': 'Generate libvpx example code <(RULE_INPUT_PATH).',
+            },
+          ],
+          'sources': [
+            'source/libvpx/examples/simple_encoder.txt',
+          ]
+        },
+        {
+          'target_name': 'simple_decoder',
+          'type': 'executable',
+          'dependencies': [
+            'libvpx',
+          ],
+
+          # Copy the script to the output folder so that we can use it with
+          # absolute path.
+          'copies': [{
+            'destination': '<(shared_generated_dir)/simple_decoder',
+            'files': [
+              'source/libvpx/examples/gen_example_code.sh',
+            ],
+          }],
+
+          # Rule to convert .txt files to .c files.
+          'rules': [
+            {
+              'rule_name': 'generate_example',
+              'extension': 'txt',
+              'inputs': [ '<(shared_generated_dir)/simple_decoder/gen_example_code.sh', ],
+              'outputs': [
+                '<(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
+              ],
+              'action': [
+                'bash',
+                '-c',
+                '<(shared_generated_dir)/simple_decoder/gen_example_code.sh <(RULE_INPUT_PATH) > <(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
+              ],
+              'process_outputs_as_sources': 1,
+              'message': 'Generate libvpx example code <(RULE_INPUT_PATH).',
+            },
+          ],
+          'sources': [
+            'source/libvpx/examples/simple_decoder.txt',
+          ]
+        },
+      ],
+    }, { # use_system_libvpx==1
+      'targets': [
+        {
+          'target_name': 'libvpx',
+          'type': 'none',
           'direct_dependent_settings': {
-            'include_dirs': [
-              'source/libvpx',
+            'cflags': [
+              '<!@(pkg-config --cflags vpx)',
+            ],
+            'defines': [
+              'USE_SYSTEM_LIBVPX',
             ],
           },
-          'conditions': [
-            # Libvpx optimizations for ARMv6 or ARMv7 without NEON.
-            ['arm_neon==0', {
-              'includes': [
-                'libvpx_srcs_arm.gypi',
-              ],
-            }],
-            # Libvpx optimizations for ARMv7 with NEON.
-            ['arm_neon==1', {
-              'includes': [
-                'libvpx_srcs_arm_neon.gypi',
-              ],
-            }],
-            ['OS == "android"', {
-              'include_dirs': [
-                '<(android_ndk_include)',
-                '<(android_ndk_include)/machine',
-              ],
-              'defines': [
-                'ANDROID_CPU_ARM_FEATURE_NEON=4',
-              ],
-            }],
-            [ 'chromeos == 1', {
-              # ChromeOS needs these files for animated WebM avatars.
-              'sources': [
-                'source/libvpx/libmkv/EbmlIDs.h',
-                'source/libvpx/libmkv/EbmlWriter.c',
-                'source/libvpx/libmkv/EbmlWriter.h',
-              ],
-            }],
-          ],
+          'link_settings': {
+            'ldflags': [
+              '<!@(pkg-config --libs-only-L --libs-only-other vpx)',
+            ],
+            'libraries': [
+              '<!@(pkg-config --libs-only-l vpx)',
+            ],
+          },
         },
       ],
     }],
   ],
-  'targets': [
-    {
-      # A tool that runs on host to tract integers from object file.
-      'target_name': 'libvpx_obj_int_extract',
-      'type': 'executable',
-      'toolsets': ['host'],
-      'include_dirs': [
-        'source/config/<(OS_CATEGORY)/<(target_arch_full)',
-        'source/config',
-        'source/libvpx',
-      ],
-      'sources': [
-        'source/libvpx/build/make/obj_int_extract.c',
-      ]
-    },
-    {
-      # A library that contains assembly offsets needed.
-      'target_name': 'libvpx_asm_offsets',
-      'type': 'static_library',
-      'hard_dependency': 1,
-      'include_dirs': [
-        'source/config/<(OS_CATEGORY)/<(target_arch_full)',
-        'source/config',
-        'source/libvpx',
-      ],
-      'conditions': [
-        ['asan==1', {
-          'cflags!': [ '-faddress-sanitizer', ],
-          'xcode_settings': {
-            'OTHER_CFLAGS!': [ '-faddress-sanitizer', ],
-          },
-          'ldflags!': [ '-faddress-sanitizer', ],
-        }],
-      ],
-      'sources': [
-        '<(shared_generated_dir)/vpx_rtcd.h',
-        'source/libvpx/vp8/common/asm_com_offsets.c',
-        'source/libvpx/vp8/decoder/asm_dec_offsets.c',
-        'source/libvpx/vp8/encoder/asm_enc_offsets.c',
-      ],
-    },
-    {
-      # A target that takes assembly offsets library and generate the
-      # corresponding assembly files.
-      # This target is a hard dependency because the generated .asm files
-      # are needed all assembly optimized files in libvpx.
-      'target_name': 'gen_asm_offsets',
-      'type': 'none',
-      'hard_dependency': 1,
-      'dependencies': [
-        'libvpx_asm_offsets',
-        'libvpx_obj_int_extract#host',
-      ],
-      'conditions': [
-        ['OS=="win"', {
-          'variables': {
-            'ninja_obj_dir': '<(PRODUCT_DIR)/obj/third_party/libvpx/source/libvpx/vp8',
-          },
-          'actions': [
-            {
-              'action_name': 'copy_enc_offsets_obj',
-              'inputs': [ 'copy_obj.sh' ],
-              'outputs': [ '<(INTERMEDIATE_DIR)/asm_enc_offsets.obj' ],
-              'action': [
-                '<(DEPTH)/third_party/libvpx/copy_obj.sh',
-                '-d', '<@(_outputs)',
-                '-s', '<(PRODUCT_DIR)/obj/libvpx_asm_offsets/asm_enc_offsets.obj',
-                '-s', '<(ninja_obj_dir)/encoder/libvpx_asm_offsets.asm_enc_offsets.obj',
-              ],
-              'process_output_as_sources': 1,
-            },
-            {
-              'action_name': 'copy_dec_offsets_obj',
-              'inputs': [ 'copy_obj.sh' ],
-              'outputs': [ '<(INTERMEDIATE_DIR)/asm_dec_offsets.obj' ],
-              'action': [
-                '<(DEPTH)/third_party/libvpx/copy_obj.sh',
-                '-d', '<@(_outputs)',
-                '-s', '<(PRODUCT_DIR)/obj/libvpx_asm_offsets/asm_dec_offsets.obj',
-                '-s', '<(ninja_obj_dir)/decoder/libvpx_asm_offsets.asm_dec_offsets.obj',
-              ],
-              'process_output_as_sources': 1,
-            },
-            {
-              'action_name': 'copy_com_offsets_obj',
-              'inputs': [ 'copy_obj.sh' ],
-              'outputs': [ '<(INTERMEDIATE_DIR)/asm_com_offsets.obj' ],
-              'action': [
-                '<(DEPTH)/third_party/libvpx/copy_obj.sh',
-                '-d', '<@(_outputs)',
-                '-s', '<(PRODUCT_DIR)/obj/libvpx_asm_offsets/asm_com_offsets.obj',
-                '-s', '<(ninja_obj_dir)/common/libvpx_asm_offsets.asm_com_offsets.obj',
-              ],
-              'process_output_as_sources': 1,
-            },
-          ],
-          'sources': [
-            '<(INTERMEDIATE_DIR)/asm_com_offsets.obj',
-            '<(INTERMEDIATE_DIR)/asm_dec_offsets.obj',
-            '<(INTERMEDIATE_DIR)/asm_enc_offsets.obj',
-          ],
-        }, {
-          'actions': [
-            {
-              # Take archived .a file and unpack it unto .o files.
-              'action_name': 'unpack_lib_posix',
-              'inputs': [
-                'unpack_lib_posix.sh',
-              ],
-              'outputs': [
-                '<(INTERMEDIATE_DIR)/asm_com_offsets.o',
-                '<(INTERMEDIATE_DIR)/asm_dec_offsets.o',
-                '<(INTERMEDIATE_DIR)/asm_enc_offsets.o',
-              ],
-              'action': [
-                '<(DEPTH)/third_party/libvpx/unpack_lib_posix.sh',
-                '-d', '<(INTERMEDIATE_DIR)',
-                '-a', '<(LIB_DIR)/libvpx_asm_offsets.a',
-                '-a', '<(LIB_DIR)/third_party/libvpx/libvpx_asm_offsets.a',
-                '-f', 'asm_com_offsets.o',
-                '-f', 'asm_dec_offsets.o',
-                '-f', 'asm_enc_offsets.o',
-              ],
-              'process_output_as_sources': 1,
-            },
-          ],
-          # Need this otherwise gyp won't run the rule on them.
-          'sources': [
-            '<(INTERMEDIATE_DIR)/asm_com_offsets.o',
-            '<(INTERMEDIATE_DIR)/asm_dec_offsets.o',
-            '<(INTERMEDIATE_DIR)/asm_enc_offsets.o',
-          ],
-        }],
-      ],
-      'rules': [
-        {
-          # Rule to extract integer values for each symbol from an object file.
-          'rule_name': 'obj_int_extract',
-          'extension': '<(asm_obj_extension)',
-          'inputs': [
-            '<(PRODUCT_DIR)/libvpx_obj_int_extract',
-            'obj_int_extract.sh',
-          ],
-          'outputs': [
-            '<(shared_generated_dir)/<(RULE_INPUT_ROOT).asm',
-          ],
-          'variables': {
-            'conditions': [
-              ['target_arch=="arm"', {
-                'asm_format': 'gas',
-              }, {
-                'asm_format': 'rvds',
-              }],
-            ],
-          },
-          'action': [
-            '<(DEPTH)/third_party/libvpx/obj_int_extract.sh',
-            '-e', '<(PRODUCT_DIR)/libvpx_obj_int_extract',
-            '-f', '<(asm_format)',
-            '-b', '<(RULE_INPUT_PATH)',
-            '-o', '<(shared_generated_dir)/<(RULE_INPUT_ROOT).asm',
-          ],
-          'message': 'Generate assembly offsets <(RULE_INPUT_PATH).',
-        },
-      ],
-    },
-    {
-      'target_name': 'simple_encoder',
-      'type': 'executable',
-      'dependencies': [
-        'libvpx',
-      ],
-
-      # Copy the script to the output folder so that we can use it with
-      # absolute path.
-      'copies': [{
-        'destination': '<(shared_generated_dir)/simple_encoder',
-        'files': [
-          'source/libvpx/examples/gen_example_code.sh',
-        ],
-      }],
-
-      # Rule to convert .txt files to .c files.
-      'rules': [
-        {
-          'rule_name': 'generate_example',
-          'extension': 'txt',
-          'inputs': [ '<(shared_generated_dir)/simple_encoder/gen_example_code.sh', ],
-          'outputs': [
-            '<(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
-          ],
-          'action': [
-            'bash',
-            '-c',
-            '<(shared_generated_dir)/simple_encoder/gen_example_code.sh <(RULE_INPUT_PATH) > <(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
-          ],
-          'process_outputs_as_sources': 1,
-          'message': 'Generate libvpx example code <(RULE_INPUT_PATH).',
-        },
-      ],
-      'sources': [
-        'source/libvpx/examples/simple_encoder.txt',
-      ]
-    },
-    {
-      'target_name': 'simple_decoder',
-      'type': 'executable',
-      'dependencies': [
-        'libvpx',
-      ],
-
-      # Copy the script to the output folder so that we can use it with
-      # absolute path.
-      'copies': [{
-        'destination': '<(shared_generated_dir)/simple_decoder',
-        'files': [
-          'source/libvpx/examples/gen_example_code.sh',
-        ],
-      }],
-
-      # Rule to convert .txt files to .c files.
-      'rules': [
-        {
-          'rule_name': 'generate_example',
-          'extension': 'txt',
-          'inputs': [ '<(shared_generated_dir)/simple_decoder/gen_example_code.sh', ],
-          'outputs': [
-            '<(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
-          ],
-          'action': [
-            'bash',
-            '-c',
-            '<(shared_generated_dir)/simple_decoder/gen_example_code.sh <(RULE_INPUT_PATH) > <(shared_generated_dir)/<(RULE_INPUT_ROOT).c',
-          ],
-          'process_outputs_as_sources': 1,
-          'message': 'Generate libvpx example code <(RULE_INPUT_PATH).',
-        },
-      ],
-      'sources': [
-        'source/libvpx/examples/simple_decoder.txt',
-      ]
-    },
-  ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: