splash-rs/build.rs

fn main() {
    link_swift();
    link_swift_package("highlight-swift", "./highlight-swift/");

    let target = get_swift_target_info();
    // on linux we need to tell it to link against the swift stdlib,
    // because the --static-swift-stdlib on swift build doesn't work for static libraries
    // on macos, it all magically works
    if target.target.unversioned_triple.contains("linux") {
        // include the swift runtime library path in the rpath
        target.paths.runtime_library_paths.iter().for_each(|path| {
            println!("cargo:rustc-link-arg=-Wl,-rpath={}", path);
        });

        // link in swiftrt.o, which initializes the swift runtime
        let arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
        println!(
            "cargo:rustc-link-arg={}/linux/{}/swiftrt.o",
            &target.paths.runtime_resource_path, arch
        );

        // link against the swift stdlib and all th supporting pieces
        println!("cargo:rustc-link-lib=dylib=BlocksRuntime");
        println!("cargo:rustc-link-lib=dylib=dispatch");
        println!("cargo:rustc-link-lib=dylib=FoundationEssentials");
        println!("cargo:rustc-link-lib=dylib=FoundationNetworking");
        println!("cargo:rustc-link-lib=dylib=Foundation");
        println!("cargo:rustc-link-lib=dylib=FoundationXML");
        println!("cargo:rustc-link-lib=dylib=icudataswift");
        println!("cargo:rustc-link-lib=dylib=icui18nswift");
        println!("cargo:rustc-link-lib=dylib=icuucswift");
        println!("cargo:rustc-link-lib=dylib=_InternalSwiftScan");
        println!("cargo:rustc-link-lib=dylib=_InternalSwiftStaticMirror");
        println!("cargo:rustc-link-lib=dylib=swift_Concurrency");
        println!("cargo:rustc-link-lib=dylib=swiftCore");
        println!("cargo:rustc-link-lib=dylib=swift_Differentiation");
        println!("cargo:rustc-link-lib=dylib=swiftDispatch");
        println!("cargo:rustc-link-lib=dylib=swiftDistributed");
        println!("cargo:rustc-link-lib=dylib=swiftGlibc");
        println!("cargo:rustc-link-lib=dylib=swiftRegexBuilder");
        println!("cargo:rustc-link-lib=dylib=swift_RegexParser");
        println!("cargo:rustc-link-lib=dylib=swiftRemoteMirror");
        println!("cargo:rustc-link-lib=dylib=swift_StringProcessing");
        println!("cargo:rustc-link-lib=dylib=swiftSwiftOnoneSupport");
        println!("cargo:rustc-link-lib=dylib=XCTest");
    }
}

// Copied from https://github.com/Brendonovich/swift-rs
// With get_swift_target_info changed to print the current target
// rather than always trying for the macosx target.

use std::{env, process::Command};

use serde::Deserialize;

#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct SwiftTargetInfo {
    pub unversioned_triple: String,
    #[serde(rename = "librariesRequireRPath")]
    pub libraries_require_rpath: bool,
}

#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct SwiftPaths {
    pub runtime_library_paths: Vec<String>,
    pub runtime_resource_path: String,
}

#[derive(Debug, Deserialize)]
pub struct SwiftTarget {
    pub target: SwiftTargetInfo,
    pub paths: SwiftPaths,
}

pub fn get_swift_target_info() -> SwiftTarget {
    let swift_target_info_str = Command::new("swift")
        .args(&["-print-target-info"])
        .output()
        .unwrap()
        .stdout;

    serde_json::from_slice(&swift_target_info_str).unwrap()
}

pub fn link_swift() {
    let swift_target_info = get_swift_target_info();
    if swift_target_info.target.libraries_require_rpath {
        panic!("Libraries require RPath! Change minimum MacOS value to fix.")
    }

    swift_target_info
        .paths
        .runtime_library_paths
        .iter()
        .for_each(|path| {
            println!("cargo:rustc-link-search=native={}", path);
        });
}

pub fn link_swift_package(package_name: &str, package_root: &str) {
    let profile = env::var("PROFILE").unwrap();
    dbg!(&profile);

    if !Command::new("swift")
        .args(&["build", "-c", &profile])
        .current_dir(package_root)
        .status()
        .unwrap()
        .success()
    {
        panic!("Failed to compile swift package {}", package_name);
    }

    let swift_target_info = get_swift_target_info();

    println!(
        "cargo:rustc-link-search=native={}.build/{}/{}",
        package_root, swift_target_info.target.unversioned_triple, profile
    );
    println!("cargo:rustc-link-lib=static={}", package_name);
}