From 6ef2175eeab7b7a514af8079a2a48c7e03cc1882 Mon Sep 17 00:00:00 2001
From: Jakub Chlanda <jchlanda@accesssoftek.com>
Date: Wed, 17 Dec 2025 10:05:53 +0000
Subject: [PATCH] Add support for `aarch64-unknown-linux-pauthtest`

This is based on a fork of Musl libc, maintained by Access Softek.
Please see: https://github.com/access-softek/musl for details.
---
 build.rs           |  9 +++++++--
 libc-test/build.rs |  8 +++++---
 src/unix/mod.rs    | 12 +++++++++++-
 3 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/build.rs b/build.rs
index b9a8305918518..7b14e590e32b5 100644
--- a/build.rs
+++ b/build.rs
@@ -69,6 +69,7 @@ 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();
 
     // The ABI of libc used by std is backward compatible with FreeBSD 12.
     // The ABI of libc from crates.io is backward compatible with FreeBSD 12.
@@ -115,8 +116,12 @@ 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;
     }
 
diff --git a/libc-test/build.rs b/libc-test/build.rs
index 6879015d217fb..585782e78e188 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3679,7 +3679,7 @@ 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) {
@@ -3716,8 +3716,10 @@ 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 musl_v1_2_3 = env::var("RUST_LIBC_UNSTABLE_MUSL_V1_2_3").is_ok();
+    // Force modern musl for pauthtest.
+    let musl_v1_2_3 = env::var("RUST_LIBC_UNSTABLE_MUSL_V1_2_3").is_ok() || pauthtest;
     if musl_v1_2_3 {
         assert!(musl);
     }
@@ -4884,7 +4886,7 @@ 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");
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index ef83c7c9a5532..d035c621ee204 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -514,7 +514,17 @@ 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(target_abi = "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(target_abi = "pauthtest")),
+        target_env = "ohos"
+    ))] {
         #[cfg_attr(
             feature = "rustc-dep-of-std",
             link(