https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121366
--- Comment #5 from kargls at comcast dot net --- (In reply to Jerry DeLisle from comment #4) > What is different about sind? (obvious question) It's for degree sin functions. Originally, we tried to use on gfc_resolve_trig() to build the library function names for the different functions. It was then re-used with the half-cycle functions. The problem is obviously the f->value.function.isym is NULL in = gfc_get_string (PREFIX ("%s_%c%d"), f->value.function.isym->name, Grepping the source, one sees that this is the only set of functions that try to reference f->value.function.isym on the RHS. I have a patch cooking. We basically need to add new functions such as gfc_resolve_sind (gfc_expr *f, gfc_expr *x) { f->ts = x->ts; f->value.function.name = gfc_get_string (PREFIX ("%sind_%c%d"), gfc_type_letter (x->ts.type), gfc_type_abi_kind (&x->ts)); }