when creating a DSO, the file given by _f_i_l_e_n_a_m_e contains a list of
symbols that should be hidden. Ignored if any symbols are exported
by the ----BBBB eeeexxxxppppoooorrrrtttt====_n_a_m_e,... or ----BBBB eeeexxxxppppoooorrrrttttssss____ffffiiiilllleeee====ffffiiiilllleeeennnnaaaammmmeeee options.