Eanble debug-info for wasmtime

Author: jieyouxu

src/bootstrap/src/lib.rs

@@ -1395,16 +1395,19 @@ impl Build {
         // its caching system since we're executing quite a lot of tests and
         // ideally shouldn't pollute the cache too much.
         if let Some(path) = finder.maybe_have("wasmtime") {
-            if let Ok(mut path) = path.into_os_string().into_string() {
-                path.push_str(" run -C cache=n --dir .");
+            if let Ok(mut cmd) = path.into_os_string().into_string() {
+                cmd.push_str(" run -C cache=n --dir .");
                 // Make sure that tests have access to RUSTC_BOOTSTRAP. This (for example) is
                 // required for libtest to work on beta/stable channels.
                 //
                 // NB: with Wasmtime 20 this can change to `-S inherit-env` to
                 // inherit the entire environment rather than just this single
                 // environment variable.
-                path.push_str(" --env RUSTC_BOOTSTRAP");
-                return Some(path);
+                cmd.push_str(" --env RUSTC_BOOTSTRAP");
+                // Make sure debug-info is enabled so we can have backtraces with file names and
+                // line numbers.
+                cmd.push_str(" -D debug-info=y");
+                return Some(cmd);
             }
         }