Writable parameters can be used as global outputs inside functions with
side-effects.
gcc/ada/
* sem_prag.adb (Collect_Global_Item): Handle functions with
side-effects.
-- outputs when the related type is access-to-variable.
if Ekind (Formal) = E_In_Parameter
- and then Ekind (Spec_Id) not in E_Function
- | E_Generic_Function
+ and then (Ekind (Spec_Id) not in E_Function
+ | E_Generic_Function
+ or else Is_Function_With_Side_Effects (Spec_Id))
and then Is_Access_Variable (Etype (Formal))
then
Append_New_Elmt (Formal, Subp_Outputs);