Add support for aarch64-unknown-linux-pauthtest target

build.rs

@@ -35,6 +35,7 @@ const ALLOWED_CFGS: &[&str] = &[
     // Corresponds to `_REDIR_TIME64` in musl: symbol redirects to __*_time64
     "musl_redir_time64",
     "vxworks_lt_25_09",
+    "libc_pauthtest",
 ];
 
 // Extra values to allow for check-cfg.
@@ -69,6 +70,14 @@ fn main() {
     let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
     let target_ptr_width = env::var("CARGO_CFG_TARGET_POINTER_WIDTH").unwrap_or_default();
     let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default();
+    let target_abi = env::var("CARGO_CFG_TARGET_ABI").unwrap_or_default();
+
+    // FIXME(msrv): Once the MSRV is 1.78, use `cfg(target_abi = "pauthtest")`
+    // directly instead of translating it to `libc_pauthtest`. `target_abi`
+    // cannot be used directly in cfg expressions on the current MSRV.
+    if target_abi == "pauthtest" {
+        println!("cargo:rustc-cfg=libc_pauthtest");
+    }
 
     // FIXME: this can be removed in 1-2 releases
     println!("cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_FREEBSD_VERSION");
@@ -122,8 +131,12 @@ fn main() {
     // OpenHarmony uses a fork of the musl libc
     let musl = target_env == "musl" || target_env == "ohos";
 
-    // loongarch64, hexagon, and ohos only exist with recent musl
-    if target_arch == "loongarch64" || target_arch == "hexagon" || target_env == "ohos" {
+    // loongarch64, hexagon, ohos and pauthtest only exist with recent musl
+    if target_arch == "loongarch64"
+        || target_arch == "hexagon"
+        || target_env == "ohos"
+        || target_abi == "pauthtest"
+    {
         musl_v1_2_3 = true;
     }
 

libc-test/build.rs

@@ -3921,7 +3921,7 @@ fn test_linux(target: &str) {
 
     // target_env
     let gnu = target.contains("gnu");
-    let musl = target.contains("musl") || target.contains("ohos");
+    let musl = target.contains("musl") || target.contains("ohos") || target.contains("pauthtest");
     let uclibc = target.contains("uclibc");
 
     match (l4re, gnu, musl, uclibc) {
@@ -3960,10 +3960,12 @@ fn test_linux(target: &str) {
     let mips = target.contains("mips");
     let mips64 = target.contains("mips64");
     let mips32 = mips && !mips64;
+    let pauthtest = target.contains("pauthtest");
     let versions = &*VERSIONS;
     let kernel = versions.linux.unwrap();
 
-    let musl_v1_2_3 = env::var("CARGO_CFG_LIBC_UNSTABLE_MUSL_V1_2_3").is_ok();
+    // Force modern musl also for pauthtest.
+    let musl_v1_2_3 = env::var("CARGO_CFG_LIBC_UNSTABLE_MUSL_V1_2_3").is_ok() || pauthtest;
     if musl_v1_2_3 {
         assert!(musl);
     }
@@ -5332,7 +5334,7 @@ fn test_linux(target: &str) {
 // are included (e.g. because including both sets of headers clashes)
 fn test_linux_like_apis(target: &str) {
     let gnu = target.contains("gnu");
-    let musl = target.contains("musl") || target.contains("ohos");
+    let musl = target.contains("musl") || target.contains("ohos") || target.contains("pauthtest");
     let linux = target.contains("linux");
     let wali = target.contains("linux") && target.contains("wasm32");
     let emscripten = target.contains("emscripten");

src/unix/mod.rs

@@ -519,7 +519,17 @@ cfg_if! {
         #[link(name = "dl", cfg(not(target_feature = "crt-static")))]
         #[link(name = "c", cfg(not(target_feature = "crt-static")))]
         extern "C" {}
-    } else if #[cfg(any(target_env = "musl", target_env = "ohos"))] {
+    } else if #[cfg(libc_pauthtest)] {
+        #[link(name = "c")]
+        #[link(name = "m")]
+        #[link(name = "rt")]
+        #[link(name = "pthread")]
+        #[link(name = "dl")]
+        extern "C" {}
+    } else if #[cfg(any(
+        all(target_env = "musl", not(libc_pauthtest)),
+        target_env = "ohos"
+    ))] {
         #[cfg_attr(
             feature = "rustc-dep-of-std",
             link(