# TDLib iOS Linking Status

Local toolchain status:

- Xcode 26.5 is installed at `/Applications/Xcode.app`.
- iOS 26.5 simulator runtime is installed.
- `scripts/check-ios-prereqs.sh` passes.
- `scripts/run-ios-simulator-app.sh` launches the fake-backed SwiftUI shell in iOS Simulator.

Previous real TDLib blocker:

```bash
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer cargo build -p tele-ios-ffi --target aarch64-apple-ios-sim --release
```

Observed failure:

```text
[Your OS or architecture may be unsupported.] Failed to download file: Please try using the `pkg-config` or `local-tdlib` features.
404 Not Found
https://github.com/FedericoBruzzone/tdlib-rs/releases/download/v1.2.0/tdlib-1.8.29-ios-aarch64.zip
```

Interpretation:

- Rust, Swift, Xcode, and the iOS simulator runtime are working.
- The fake-backed iOS app shell can be built, installed, launched, and rendered.
- `download-tdlib` cannot be used for iOS because `tdlib-rs` 1.2.0 does not publish the iOS artifact requested by its build script.

Current real TDLib status:

- `scripts/build-tdlib-ios.sh` builds TDLib `1.8.29` locally for iOS device and simulator.
- `.build/tdlib-ios/iphoneos/lib/libtdjson.1.8.29.dylib` is `arm64`.
- `.build/tdlib-ios/iphonesimulator/lib/libtdjson.1.8.29.dylib` is a universal `x86_64` + `arm64` simulator dylib.
- `scripts/check-ios-tdlib-linking.sh` builds `tele-ios-ffi` for `aarch64-apple-ios-sim` with local TDLib.
- `IOS_RUST_TARGET=aarch64-apple-ios scripts/build-ios-ffi-with-local-tdlib.sh` builds `tele-ios-ffi` for device with local TDLib.
- `scripts/build-ios-real-ffi-xcframework.sh` packages simulator Rust slices into `tele_ios_ffi.xcframework`, packages local `libtdjson` into `tdjson.xcframework`, and writes generated Swift bindings into the Swift package's local `Generated` path.
- `TELE_IOS_USE_LOCAL_FFI=1 scripts/build-ios-simulator-app.sh` builds and packages the SwiftUI simulator app against the real Rust/TDLib FFI path, including `Frameworks/libtdjson.dylib` in the `.app` bundle.
- The repo patches `tdlib-rs` through `crates/vendor/tdlib-rs` because upstream `src/build.rs` does not handle `target_os = "ios"` for `local-tdlib`.

Selected path:

1. Keep `download-tdlib` for the terminal/macOS build path.
2. Build TDLib locally for iOS and iOS Simulator from the TDLib source commit matching TDLib `1.8.29`.
3. Build `tele-ios-ffi` with `tele-core/tdlib-local` and `LOCAL_TDLIB_PATH`.
4. Package the resulting Rust FFI library and TDLib dylib into the iOS app/XCFramework path.

The TDLib source commit used for `1.8.29` is:

```text
af69dd4397b6dc1bf23ba0fd0bf429fcba6454f6
```

This can be checked with:

```bash
npm info prebuilt-tdlib@td-1.8.29 tdlib --json
```

Build local TDLib artifacts:

```bash
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer scripts/build-tdlib-ios.sh
```

This writes local, untracked outputs to:

```text
.build/tdlib-ios/iphoneos/
.build/tdlib-ios/iphonesimulator/
```

Build the real iOS FFI path against local TDLib:

```bash
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer scripts/build-ios-ffi-with-local-tdlib.sh
```

or for a device target:

```bash
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer IOS_RUST_TARGET=aarch64-apple-ios scripts/build-ios-ffi-with-local-tdlib.sh
```

Package the real FFI path for the Swift app and build the simulator `.app`:

```bash
DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer scripts/build-ios-real-ffi-xcframework.sh
TELE_IOS_USE_LOCAL_FFI=1 DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer scripts/build-ios-simulator-app.sh
```

Known local prerequisites:

- Xcode with the iOS SDK installed.
- Homebrew build tools: `brew install cmake gperf coreutils`.
- Rust iOS targets: `rustup target add aarch64-apple-ios-sim aarch64-apple-ios`.
- `scripts/build-tdlib-ios.sh` builds only the required OpenSSL platforms through TDLib's vendored `Python-Apple-support` flow, with a local patch for the simulator target triple under Xcode 26.
- TDLib CMake uses `TDLIB_IOS_DEPLOYMENT_TARGET=17.0` by default to match the Swift package minimum iOS version.
- TDLib's `prepare_cross_compiling` target is run as a host-side generation step before cross-compiling, so generated TL/MIME sources exist for the iOS build.

Example local blocker if these tools are missing:

```text
Required tool not found: cmake
```

CMake 4.x compatibility is handled by passing `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` to TDLib's configure step.