From c45fc2b842ff499915213f7f10675d68fb31d273 Mon Sep 17 00:00:00 2001
From: odlot <131015417+odlot@users.noreply.github.com>
Date: Thu, 4 Dec 2025 21:19:17 +0100
Subject: [PATCH 1/3] Add support for xray in aarch64 unknown none target

---
 compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
index 13d3b77588a0e..297bd0abc864e 100644
--- a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
+++ b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none.rs
@@ -30,6 +30,7 @@ pub(crate) fn target() -> Target {
         stack_probes: StackProbeType::Inline,
         panic_strategy: PanicStrategy::Abort,
         default_uwtable: true,
+        supports_xray: true,
         ..Default::default()
     };
     Target {

From 689279eb04576a0635ff0180f3db8374352302b6 Mon Sep 17 00:00:00 2001
From: odlot <131015417+odlot@users.noreply.github.com>
Date: Mon, 11 May 2026 21:41:50 +0200
Subject: [PATCH 2/3] Add support for xray in aarch64 unknown none softfloat
 target

---
 .../src/spec/targets/aarch64_unknown_none_softfloat.rs           | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs
index 05876891ebd7d..f6527d236d10c 100644
--- a/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs
+++ b/compiler/rustc_target/src/spec/targets/aarch64_unknown_none_softfloat.rs
@@ -27,6 +27,7 @@ pub(crate) fn target() -> Target {
         stack_probes: StackProbeType::Inline,
         panic_strategy: PanicStrategy::Abort,
         default_uwtable: true,
+        supports_xray: true,
         ..Default::default()
     };
     Target {

From 743c6a670d4354aee5b6f7235c7a66cdd8f80199 Mon Sep 17 00:00:00 2001
From: odlot <131015417+odlot@users.noreply.github.com>
Date: Mon, 11 May 2026 21:59:26 +0200
Subject: [PATCH 3/3] docs: Add remark to bring your own runtime if none
 available

---
 src/doc/unstable-book/src/compiler-flags/instrument-xray.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/doc/unstable-book/src/compiler-flags/instrument-xray.md b/src/doc/unstable-book/src/compiler-flags/instrument-xray.md
index 7fb33cd68b4a3..68b881df47385 100644
--- a/src/doc/unstable-book/src/compiler-flags/instrument-xray.md
+++ b/src/doc/unstable-book/src/compiler-flags/instrument-xray.md
@@ -37,3 +37,4 @@ which on their own don't do anything useful.
 In order to actually trace the functions,
 you will need to link a separate runtime library of your choice,
 such as Clang's [XRay Runtime Library](https://www.llvm.org/docs/XRay.html#xray-runtime-library).
+On targets where such a runtime is not available but instrumentation is supported, you must supply and link your own runtime library.