code: private String getDebugInformationFormat(final CommandLineCompilerConfiguration compilerConfig) {
      String format = "0";
      final String[] args = compilerConfig.getPreArguments();
      for (final String arg : args) {
        if ("/Z7".equals(arg)) {
          format = "1";
        }
        if ("/Zd".equals(arg)) {
          format = "2";
        }
        if ("/Zi".equals(arg)) {
          format = "3";
        }
        if ("/ZI".equals(arg)) {
          format = "4";
        }
      }
      return format;
    }
docs: Get value of DebugInformationFormat property.
  
  @param compilerConfig
  compiler configuration.
  @return value of DebugInformationFormat property.