cargo lipo

Provides a cargo lipo subcommand which automatically creates a universal library for use with your iOS application.

Maintenance Status

Please consider this project deprecated / passively maintained. This is partly because I am not currently working on any iOS projects, and partly because I believe that there exists a better alternative to using lipo:

One can use architecture (and OS) specific environment variables in Xcode. The OS specific part could be configured in the Xcode project editor last time I tried, but the architecture specific part needed to be added by manually editing the project.pbxproj file, for example like this:

    "LIBRARY_SEARCH_PATHS[sdk=iphoneos*]" = ../path/to/target/debug/<...>;
    "LIBRARY_SEARCH_PATHS[sdk=macosx11.1][arch=arm64]" = ../path/to/target/<...>;
    "LIBRARY_SEARCH_PATHS[sdk=macosx11.1][arch=x86_64]" = ../path/to/target/<...>;

Thus, I believe that a future iOS support crate should offer primarily two features:

• Something similar to the current --xcode-integ flag.
• Something which can do the project.pbxproj editing.

Usage

From anywhere you would usually run cargo you can now run cargo lipo or cargo lipo --release to create a universal library for ios, which can be found in $target/universal/{release|debug}/$lib_name.a.

Make sure you have a library target in your Cargo.toml with a crate type of staticlib:

[lib]
name = "..."
crate-type = ["staticlib"]

Xcode Integration

cargo-lipo easily integrates with Xcode. Although note that this functionality has only been added recently and may not yet be perfect (the Xcode build process is somewhat of a blackbox to me).

1. In your "Build Settings" change "Enable Bitcode" to No.

2. Add a new "Run Script" phase to your "Build Phases". Place it before "Compile Sources". Add something like the following to the script:

   # The $PATH used by Xcode likely won't contain Cargo, fix that.
   # This assumes a default `rustup` setup.
   export PATH="$HOME/.cargo/bin:$PATH"
   
   # --xcode-integ determines --release and --targets from Xcode's env vars.
   # Depending your setup, specify the rustup toolchain explicitly.
   cargo lipo --xcode-integ --manifest-path ../something/Cargo.toml
   

3. Build the project once, then update the "Link Binary with Libraries" phase: Click the +, then choose "Add Other...". Navigate to your-cargo-project/target/universal/{debug-or-release} and select your library(s).

4. Go back to your "Build Settings" and add "Library Search Paths" for "Debug" and "Release", pointing to your-cargo-project/target/universal/{debug-or-release}.

Installation

Install cargo lipo with cargo install cargo-lipo. cargo lipo should always be buildable with the latest stable Rust version. For the minimum supported version check .travis.yml.

You also need a rust compiler which can compile for the iOS targets. If you use rustup all you should have to do is

# 64 bit targets (real device & simulator):
rustup target add aarch64-apple-ios x86_64-apple-ios
# 32 bit targets (you probably don't need these):
rustup target add armv7-apple-ios i386-apple-ios

Troubleshooting

Cargo fails with error: can't find crate for `std`: Your rust compiler most likely does not support cross-compiling to iOS.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.