Convert wasmtime check into a compiletest needs directive

src/tools/compiletest/src/header.rs

@@ -837,6 +837,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "needs-sanitizer-thread",
     "needs-threads",
     "needs-unwind",
+    "needs-wasmtime",
     "needs-xray",
     "no-prefer-dynamic",
     "normalize-stderr-32bit",

src/tools/compiletest/src/header/needs.rs

@@ -149,6 +149,11 @@ pub(super) fn handle_needs(
             condition: config.target_cfg().relocation_model == "pic",
             ignore_reason: "ignored on targets without PIC relocation model",
         },
+        Need {
+            name: "needs-wasmtime",
+            condition: config.runner.as_ref().is_some_and(|r| r.contains("wasmtime")),
+            ignore_reason: "ignored when wasmtime runner is not available",
+        },
     ];
 
     let (name, comment) = match ln.split_once([':', ' ']) {

tests/run-make/wasm-abi/rmake.rs

@@ -1,4 +1,5 @@
 //@ only-wasm32-wasip1
+//@ needs-wasmtime
 
 extern crate run_make_support;
 
@@ -11,15 +12,6 @@ fn main() {
 
     let file = tmp_dir().join("foo.wasm");
 
-    let has_wasmtime = match Command::new("wasmtime").arg("--version").output() {
-        Ok(s) => s.status.success(),
-        _ => false,
-    };
-    if !has_wasmtime {
-        println!("skipping test, wasmtime isn't available");
-        return;
-    }
-
     run(&file, "return_two_i32", "1\n2\n");
     run(&file, "return_two_i64", "3\n4\n");
     run(&file, "return_two_f32", "5\n6\n");