my $debugger_options = "-q -batch -n -x";
# run debugger and capture output.
-system("$my_debugger $debugger_options $debugger_script_file $executable_file >& $output_file");
+system("$my_debugger $debugger_options $debugger_script_file $executable_file > $output_file 2>&1");
# validate output.
system("FileCheck", "-input-file", "$output_file", "$testcase_file");