Rollup merge of #99155 - Amanieu:unstable-target-features, r=davidtwco

Keep unstable target features for asm feature checking

Inline assembly uses the target features to determine which registers
are available on the current target. However it needs to be able to
access unstable target features for this.

Fixes #99071

2 files changed, 29 insertions, 0 deletions

diff --git a/src/test/ui/asm/issue-99071.rs b/src/test/ui/asm/issue-99071.rs
new file mode 100644
index 00000000000..bb6201861df
--- /dev/null
+++ b/src/test/ui/asm/issue-99071.rs
@@ -0,0 +1,21 @@
+// compile-flags: --target thumbv6m-none-eabi
+// needs-llvm-components: arm
+// needs-asm-support
+
+#![feature(no_core, lang_items, rustc_attrs)]
+#![no_core]
+#![crate_type = "rlib"]
+
+#[rustc_builtin_macro]
+macro_rules! asm {
+    () => {};
+}
+#[lang = "sized"]
+trait Sized {}
+
+pub fn foo() {
+    unsafe {
+        asm!("", in("r8") 0);
+        //~^ cannot use register `r8`: high registers (r8+) can only be used as clobbers in Thumb-1 code
+    }
+}
diff --git a/src/test/ui/asm/issue-99071.stderr b/src/test/ui/asm/issue-99071.stderr
new file mode 100644
index 00000000000..47386ffa4a8
--- /dev/null
+++ b/src/test/ui/asm/issue-99071.stderr
@@ -0,0 +1,8 @@
+error: cannot use register `r8`: high registers (r8+) can only be used as clobbers in Thumb-1 code
+  --> $DIR/issue-99071.rs:18:18
+   |
+LL |         asm!("", in("r8") 0);
+   |                  ^^^^^^^^^^
+
+error: aborting due to previous error
+