[PATCH] rust: support Rust >= 1.91.0 target spec

[Miguel Ojeda <ojeda@kernel.org>]

Starting with Rust 1.91.0 (expected 2025-10-30), the target spec format
has changed the type of the `target-pointer-width` key from string
to integer [1].

Thus conditionally use one or the other depending on the version.

Cc: Waffle Maybe <waffle.lapkin@gmail.com>
Link: https://github.com/rust-lang/rust/pull/144443 [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
Conditional to the PR getting merged.

 scripts/generate_rust_target.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs
index 39c82908ff3a..38b3416bb979 100644
--- a/scripts/generate_rust_target.rs
+++ b/scripts/generate_rust_target.rs
@@ -225,7 +225,11 @@ fn main() {
         ts.push("features", features);
         ts.push("llvm-target", "x86_64-linux-gnu");
         ts.push("supported-sanitizers", ["kcfi", "kernel-address"]);
-        ts.push("target-pointer-width", "64");
+        if cfg.rustc_version_atleast(1, 91, 0) {
+            ts.push("target-pointer-width", 64);
+        } else {
+            ts.push("target-pointer-width", "64");
+        }
     } else if cfg.has("X86_32") {
         // This only works on UML, as i386 otherwise needs regparm support in rustc
         if !cfg.has("UML") {
@@ -245,7 +249,11 @@ fn main() {
         }
         ts.push("features", features);
         ts.push("llvm-target", "i386-unknown-linux-gnu");
-        ts.push("target-pointer-width", "32");
+        if cfg.rustc_version_atleast(1, 91, 0) {
+            ts.push("target-pointer-width", 32);
+        } else {
+            ts.push("target-pointer-width", "32");
+        }
     } else if cfg.has("LOONGARCH") {
         panic!("loongarch uses the builtin rustc loongarch64-unknown-none-softfloat target");
     } else {

base-commit: 1b237f190eb3d36f52dffe07a40b5eb210280e00
--
2.51.0