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Fix linking Mac Catalyst by including LC_BUILD_VERSION in object files Hello. My first rustc PR! Issue #106021 prevents Rust code from being linked into Mac Catalyst applications. Apple's LD has started requiring object files to contain version information about the platform they were built for, such as: * the "deployment target" (minimum supported OS version), * the SDK version * the type of the platform (macOS/iOS/catalyst/tvOS/watchOS all have a different number). This is currently only enforced when building for Mac Catalyst. Rust uses the `object` crate which added support for including this information starting with `0.31.0`. ~~I upgraded it along with `thorin-dwp` so that everything depends on 0.31. Apparently 0.31 [pulls in](https://github.com/gimli-rs/object/issues/463) `ruzstd` due to a [new ELF standard](https://maskray.me/blog/2022-09-09-zstd-compressed-debug-sections) because its `compression` feature is enabled by thorin. If you find this objectionable, let me know what the best way to avoid pulling in those dependencies might be.~~ **(`object` upgraded in https://github.com/rust-lang/rust/pull/111413)** I then added two commits: * The first one adds very basic, hard-coded support for calling `set_macho_build_version` for `-macabi` (Catalyst) targets, where it claims deployment target of Catalyst 14.0 and SDK of 16.2. * The second weaves the versioning through `rust_target::spec::TargetOptions`, so that we can stick to specifying all target-related info in one place. Kudos to ``@ara4n`` for writing [this gist](https://gist.github.com/ara4n/320a53ea768aba51afad4c9ed2168536). |
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