feat: enhance build process for xkbcommon-x11 library linking

build.rs

@@ -0,0 +1,49 @@
+//! GPUI 0.2.2 links xkbcommon-x11 even with only its Wayland backend enabled.
+//! Some hosts have the runtime SONAME but no development linker symlink.
+use std::{env, path::PathBuf, process::Command};
+
+fn compiler_library(name: &str) -> Option<PathBuf> {
+    let output = Command::new(env::var_os("CC").unwrap_or_else(|| "cc".into()))
+        .arg(format!("-print-file-name={name}"))
+        .output()
+        .ok()?;
+    if !output.status.success() {
+        return None;
+    }
+    let path = PathBuf::from(String::from_utf8(output.stdout).ok()?.trim());
+    path.is_absolute().then_some(path).filter(|p| p.is_file())
+}
+
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-env-changed=CC");
+    println!("cargo:rerun-if-env-changed=LIBRARY_PATH");
+    if env::var_os("CARGO_FEATURE_GUI").is_none()
+        || env::var("CARGO_CFG_TARGET_OS").as_deref() != Ok("linux")
+        || env::var_os("HOST") != env::var_os("TARGET")
+    {
+        return;
+    }
+    if compiler_library("libxkbcommon-x11.so").is_some() {
+        return;
+    }
+    let Some(runtime) = compiler_library("libxkbcommon-x11.so.0") else {
+        println!(
+            "cargo:warning=Install the xkbcommon-x11 development library (libxkbcommon-x11-devel on Fedora, libxkbcommon-x11-dev on Debian/Ubuntu)"
+        );
+        return;
+    };
+    println!("cargo:rerun-if-changed={}", runtime.display());
+    #[cfg(unix)]
+    {
+        let directory =
+            PathBuf::from(env::var_os("OUT_DIR").expect("Cargo OUT_DIR")).join("native");
+        std::fs::create_dir_all(&directory).expect("Create native linker directory");
+        let link = directory.join("libxkbcommon-x11.so");
+        if link.symlink_metadata().is_ok() {
+            std::fs::remove_file(&link).expect("Refresh native linker symlink");
+        }
+        std::os::unix::fs::symlink(runtime, link).expect("Create xkbcommon-x11 linker symlink");
+        println!("cargo:rustc-link-search=native={}", directory.display());
+    }
+}