Include Swift in rpath on linux

Cargo.toml

@@ -5,6 +5,10 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[build-dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
 [dependencies]
 activitystreams = "0.7.0-alpha.22"
 activitystreams-ext = "0.1.0-alpha.3"

build.rs

@@ -1,5 +1,42 @@
-// generated by `sqlx migrate build-script`
+use serde::Deserialize;
+use std::process::Command;
+
 fn main() {
     // trigger recompilation when a new migration is added
     println!("cargo:rerun-if-changed=migrations");
-}
+
+    let target = get_swift_target_info();
+    if target.target.unversioned_triple.contains("linux") {
+        target.paths.runtime_library_paths.iter().for_each(|path| {
+            println!("cargo:rustc-link-arg=-Wl,-rpath={}", path);
+        });
+    }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SwiftTargetInfo {
+    pub unversioned_triple: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SwiftPaths {
+    pub runtime_library_paths: Vec<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()
+}