Since we assume that GDB output is UTF-8, make sure it is so on all platforms.

Otherwise it'll choose some "appropriate" platform-specific default (e.g. CP1252 on Windows).

src/compiletest/runtest.rs

@@ -282,7 +282,9 @@ fn run_debuginfo_test(config: &config, props: &TestProps, testfile: &Path) {
     }
 
     // write debugger script
-    let script_str = cmds.append("\nquit\n");
+    let script_str = [~"set charset UTF-8",
+                      cmds,
+                      ~"quit\n"].connect("\n");
     debug!("script_str = %s", script_str);
     dump_output_file(config, testfile, script_str, "debugger.script");