7.4.24 WHICH_IDX_name - Which Equivalenced Index

This macro gets emitted only for equivalenced-to options. It is used to obtain the index for the one of the several equivalence class members set the equivalenced-to option.

switch (WHICH_IDX_OTHER_OPT) { case INDEX_OPT_NAME: this-option-was-really-opt-name; case INDEX_OPT_OTHER_OPT: this-option-was-really-other-opt; }