Errors when adding new member vars in 'struct function' ?

[QiangHuang <qianghuang87@xxxxxxxxx>]

     I intend to add a new member var in the structure of 'struct
function'.Take var 'struct if_fact' as an example.

     struct function
     {
        ...
        ...
        struct if_fact;         /* new member var here. */
     }

     When compiled, an error occured, saying that "undefined reference
to 'gt_pch_nx_if_fact' and 'gt_ggc_mx_if_fact' ".
     These two missing functions seemed to be automatically generated
by gengtype in the file of 'gtype-desc.c'.
     Thus I don't exactly know how to solve this problem.

     Thanks a lot~