Xcode 7 In Target > BuildPhases > Link Binary With Libraries > tap + button
When choosing frameworks to add, you cannot find *.dylib, you'll see *.tbd instead.
What is the reason for this?
**For people who need dylib, follow from this post
- Choose "Add other"
- Once in the file selection window do "CMD"+Shift+G (Go to folder) & type /usr/lib/
- From /user/lib you can find the *.dylib files
I've scoured Google but the only thing I can find so far is the following quote from the Apple developer forums:
For those who are curious, the .tbd files are new "text-based stub libraries", that provide a much more compact version of the stub libraries for use in the SDK, and help to significantly reduce its download size.
Hopefully more documentation will be coming soon.
Update
As an example, here is the entire contents of libsqlite3.tbd. It is just a text file. Note that the install-name is libsqlite3.dylib.
---
archs: [ armv7, armv7s, arm64 ]
platform: ios
install-name: /usr/lib/libsqlite3.dylib
current-version: 216.4
compatibility-version: 9.0
exports:
- archs: [ armv7, armv7s, arm64 ]
symbols: [ __sqlite3_lockstate, __sqlite3_purgeEligiblePagerCacheMemory,
__sqlite3_system_busy_handler, __sqlite_auto_profile,
__sqlite_auto_profile_syslog, __sqlite_auto_trace,
__sqlite_auto_trace_syslog, _sqlite3OsShmHasMultipleLinks,
_sqlite3OsShmRenamedWhileOpen, _sqlite3OsShmWasTruncated,
_sqlite3OsShmWasUnlinkedWhileOpen, _sqlite3VersionNumber,
_sqlite3VersionString, _sqlite3_aggregate_context,
_sqlite3_aggregate_count, _sqlite3_auto_extension,
_sqlite3_backup_finish, _sqlite3_backup_init, _sqlite3_backup_pagecount,
_sqlite3_backup_remaining, _sqlite3_backup_step,
_sqlite3_bind_blob, _sqlite3_bind_blob64, _sqlite3_bind_double,
_sqlite3_bind_int, _sqlite3_bind_int64, _sqlite3_bind_null,
_sqlite3_bind_parameter_count, _sqlite3_bind_parameter_index,
_sqlite3_bind_parameter_name, _sqlite3_bind_text,
_sqlite3_bind_text16, _sqlite3_bind_text64, _sqlite3_bind_value,
_sqlite3_bind_zeroblob, _sqlite3_blob_bytes, _sqlite3_blob_close,
_sqlite3_blob_open, _sqlite3_blob_read, _sqlite3_blob_reopen,
_sqlite3_blob_write, _sqlite3_busy_handler, _sqlite3_busy_timeout,
_sqlite3_cancel_auto_extension, _sqlite3_changes,
_sqlite3_clear_bindings, _sqlite3_close, _sqlite3_close_v2,
_sqlite3_collation_needed, _sqlite3_collation_needed16,
_sqlite3_column_blob, _sqlite3_column_bytes, _sqlite3_column_bytes16,
_sqlite3_column_count, _sqlite3_column_decltype,
_sqlite3_column_decltype16, _sqlite3_column_double,
_sqlite3_column_int, _sqlite3_column_int64, _sqlite3_column_name,
_sqlite3_column_name16, _sqlite3_column_text, _sqlite3_column_text16,
_sqlite3_column_type, _sqlite3_column_value, _sqlite3_commit_hook,
_sqlite3_compileoption_get, _sqlite3_compileoption_used,
_sqlite3_complete, _sqlite3_complete16, _sqlite3_config,
_sqlite3_context_db_handle, _sqlite3_create_collation,
_sqlite3_create_collation16, _sqlite3_create_collation_v2,
_sqlite3_create_function, _sqlite3_create_function16,
_sqlite3_create_function_v2, _sqlite3_create_module,
_sqlite3_create_module_v2, _sqlite3_data_count,
_sqlite3_data_directory, _sqlite3_db_config, _sqlite3_db_filename,
_sqlite3_db_handle, _sqlite3_db_mutex, _sqlite3_db_readonly,
_sqlite3_db_release_memory, _sqlite3_db_status,
_sqlite3_declare_vtab, _sqlite3_enable_shared_cache,
_sqlite3_errcode, _sqlite3_errmsg, _sqlite3_errmsg16,
_sqlite3_errstr, _sqlite3_exec, _sqlite3_expired,
_sqlite3_extended_errcode, _sqlite3_extended_result_codes,
_sqlite3_file_control, _sqlite3_finalize, _sqlite3_free,
_sqlite3_free_table, _sqlite3_get_autocommit, _sqlite3_get_auxdata,
_sqlite3_get_table, _sqlite3_global_recover, _sqlite3_initialize,
_sqlite3_intarray_bind, _sqlite3_intarray_create,
_sqlite3_interrupt, _sqlite3_last_insert_rowid,
_sqlite3_libversion, _sqlite3_libversion_number,
_sqlite3_limit, _sqlite3_log, _sqlite3_malloc, _sqlite3_malloc64,
_sqlite3_memory_alarm, _sqlite3_memory_highwater,
_sqlite3_memory_used, _sqlite3_mprintf, _sqlite3_msize,
_sqlite3_mutex_alloc, _sqlite3_mutex_enter, _sqlite3_mutex_free,
_sqlite3_mutex_leave, _sqlite3_mutex_try, _sqlite3_next_stmt,
_sqlite3_open, _sqlite3_open16, _sqlite3_open_v2,
_sqlite3_os_end, _sqlite3_os_init, _sqlite3_overload_function,
_sqlite3_prepare, _sqlite3_prepare16, _sqlite3_prepare16_v2,
_sqlite3_prepare_v2, _sqlite3_profile, _sqlite3_progress_handler,
_sqlite3_randomness, _sqlite3_realloc, _sqlite3_realloc64,
_sqlite3_release_memory, _sqlite3_reset, _sqlite3_reset_auto_extension,
_sqlite3_result_blob, _sqlite3_result_blob64, _sqlite3_result_double,
_sqlite3_result_error, _sqlite3_result_error16,
_sqlite3_result_error_code, _sqlite3_result_error_nomem,
_sqlite3_result_error_toobig, _sqlite3_result_int,
_sqlite3_result_int64, _sqlite3_result_null, _sqlite3_result_text,
_sqlite3_result_text16, _sqlite3_result_text16be,
_sqlite3_result_text16le, _sqlite3_result_text64,
_sqlite3_result_value, _sqlite3_result_zeroblob,
_sqlite3_rollback_hook, _sqlite3_rtree_geometry_callback,
_sqlite3_rtree_query_callback, _sqlite3_set_authorizer,
_sqlite3_set_auxdata, _sqlite3_shutdown, _sqlite3_sleep,
_sqlite3_snprintf, _sqlite3_soft_heap_limit, _sqlite3_soft_heap_limit64,
_sqlite3_sourceid, _sqlite3_sql, _sqlite3_status,
_sqlite3_status64, _sqlite3_step, _sqlite3_stmt_busy,
_sqlite3_stmt_readonly, _sqlite3_stmt_status, _sqlite3_strglob,
_sqlite3_stricmp, _sqlite3_strnicmp, _sqlite3_table_column_metadata,
_sqlite3_temp_directory, _sqlite3_test_control,
_sqlite3_thread_cleanup, _sqlite3_threadsafe, _sqlite3_total_changes,
_sqlite3_trace, _sqlite3_transfer_bindings, _sqlite3_update_hook,
_sqlite3_uri_boolean, _sqlite3_uri_int64, _sqlite3_uri_parameter,
_sqlite3_user_data, _sqlite3_value_blob, _sqlite3_value_bytes,
_sqlite3_value_bytes16, _sqlite3_value_double, _sqlite3_value_int,
_sqlite3_value_int64, _sqlite3_value_numeric_type,
_sqlite3_value_text, _sqlite3_value_text16, _sqlite3_value_text16be,
_sqlite3_value_text16le, _sqlite3_value_type, _sqlite3_version,
_sqlite3_vfs_find, _sqlite3_vfs_register, _sqlite3_vfs_unregister,
_sqlite3_vmprintf, _sqlite3_vsnprintf, _sqlite3_vtab_config,
_sqlite3_vtab_on_conflict, _sqlite3_wal_autocheckpoint,
_sqlite3_wal_checkpoint, _sqlite3_wal_checkpoint_v2,
_sqlite3_wal_hook ]
...
I found this and other .tbd files in
Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/
You can also see a .tbd file if you go to the General tab of your Xcode project and then add a library under Linked Frameworks and Libraries. The .tbd file will be copied to your project.
So it appears that the .dylib file is the actual library of binary code that your project is using and is located in the /usr/lib/ directory on the user's device. The .tbd file, on the other hand, is just a text file that is included in your project and serves as a link to the required .dylib binary. Since this text file is much smaller than the binary library, it makes the SDK's download size smaller.
At this point I am only surmising from the information given, so please correct me if I am wrong.
.dylib is the compiled binary that contains the machine code. .tbd is a smaller text file, similar to a cross-platform module map.
.tbd - Text Based .dylib stubs. It is a text file that contains the names of the methods without their bodies, declared in a dynamic library. It results in a significantly lower size of .tbd compared to a matching .dylib. Along with method names, it contains location of the corresponding .dylib, architecture, platform and some other metadata.
When we link system libraries, such as UIKit or Foundation, we don’t want to copy their entirety into the app, because it would be too large. Linker is also strict about this and does not accept shared .dylib libraries to be linked against, but only .tbd ones
Read more here
来源：https://stackoverflow.com/questions/31450690/why-xcode-7-shows-tbd-instead-of-dylib