ld_map_seg_ent_add
extern Ent_desc *ld_map_seg_ent_add(Mapfile *, Sg_desc *, const char *);
enp = ld_map_seg_ent_add(mf, sgp1, NULL);
if ((enp = ld_map_seg_ent_add(mf, sgp, name)) == NULL)