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[Ada] Spurious error with component of unchecked_union type 

gcc/ada/

	* exp_ch4.adb (Unconstrained_UU_In_Component_Declaration): A
	component declaration whose subtype indication is an entity name
	without an explicit constraint is an Unchecked_Union type only
	if the entity has an unconstrained nominal subtype (record type
	or private type) whose parent type is an Unchecked_Union.
This commit is contained in:
Ed Schonberg 2021-02-02 10:13:52 -05:00 committed by Pierre-Marie de Rodat
parent a3e2584e85
commit 476ed6bf66
1 changed files with 8 additions and 3 deletions
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11
gcc/ada/exp_ch4.adb
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@ -8143,11 +8143,16 @@ package body Exp_Ch4 is
Sindic : constant Node_Id :=
Subtype_Indication (Component_Definition (N));
begin
-- Unconstrained nominal type. In the case of a constraint
-- present, the node kind would have been N_Subtype_Indication.
-- If the component declaration includes a subtype indication
-- it is not an unchecked_union. Otherwise verify that it carries
-- the Unchecked_Union flag and is either a record or a private
-- type. A Record_Subtype declared elsewhere does not qualify,
-- even if its parent type carries the flag.
return Nkind (Sindic) in N_Expanded_Name | N_Identifier
and then Is_Unchecked_Union (Base_Type (Etype (Sindic)));
and then Is_Unchecked_Union (Base_Type (Etype (Sindic)))
and then (Ekind (Entity (Sindic)) in
E_Private_Type | E_Record_Type);
end Unconstrained_UU_In_Component_Declaration;
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