https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64980
Mikael Morin <mikael at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mikael at gcc dot gnu.org --- Comment #4 from Mikael Morin <mikael at gcc dot gnu.org> --- This cures it: Index: trans-expr.c =================================================================== --- trans-expr.c (révision 220514) +++ trans-expr.c (copie de travail) @@ -4537,6 +4537,7 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * fsym->attr.optional && e->expr_type == EXPR_VARIABLE); } +#if 0 else if (e->ts.type == BT_CLASS && fsym && fsym->ts.type == BT_CLASS && !CLASS_DATA (fsym)->as @@ -4587,6 +4588,7 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * } } else +#endif gfc_conv_expr_reference (&parmse, e); /* Catch base objects that are not variables. */ So yes, r218584 is the cause. The problem comes from the interface mapping machinery, which locally changes THIS from class MULTI_TRAPEZIUM_T to MULTI_TRAPEZIUM_NODE_CLASS_T in the call get_d_value_array(node). The code from r218584 creates a temporary using the declared type MULTI_TRAPEZIUM_T, which doesn't match what interface mapping expects.