You're doing something wrong, then. Here's a block of dummy code indented with tabs; copy-paste it into your editor, change the tab widths, and observe that the indentation stays readable.

  void my_function(int some_parameter, int another_parameter,
                   int the_third_parameter) {
  	if (some_parameter != another_parameter) {
  		here_we_are_in_an_if();
  	}
  	function_calls_work_fine_too(some_parameter,
  	                             the_third_parameter);
  }