fix wrappers

runner/runner.go

@@ -589,14 +589,22 @@ func (r *Runner) runTest(t *dsl.Test) *TestResult {
 	return tr
 }
 
+// absoluteArgs rewrites only those arguments that name a file staged in the
+// test's working directory to an absolute path. This helps wrappers (gdb,
+// valgrind) that may resolve paths from a different directory, without
+// corrupting non-path arguments — a numeric arg like "1" must stay "1", not
+// become "<tmpdir>/1". The process runs with Dir=dir anyway, so relative paths
+// already resolve there; this is purely a safety net for genuine file args.
 func absoluteArgs(dir string, args []string) []string {
 	out := make([]string, len(args))
 	for i, a := range args {
-		if !filepath.IsAbs(a) {
-			out[i] = filepath.Join(dir, a)
-		} else {
-			out[i] = a
+		if a != "" && !filepath.IsAbs(a) {
+			if _, err := os.Stat(filepath.Join(dir, a)); err == nil {
+				out[i] = filepath.Join(dir, a)
+				continue
+			}
 		}
+		out[i] = a
 	}
 	return out
 }