[gcc r14-2124] ada: Plug another loophole in the handling of private views in instances

[Marc Poulhi?s <dkm@gcc.gnu.org>]

https://gcc.gnu.org/g:125a2260ce07e384238f8569c77d07c56762d39c

commit r14-2124-g125a2260ce07e384238f8569c77d07c56762d39c
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Mon Jun 12 12:36:56 2023 +0200

    ada: Plug another loophole in the handling of private views in instances
    
    This deals with discriminants of types declared in package bodies.
    
    gcc/ada/
    
            * sem_ch12.adb (Check_Private_View): Also check the type of
            visible discriminants in record and concurrent types.

Diff:
---
 gcc/ada/sem_ch12.adb | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gcc/ada/sem_ch12.adb b/gcc/ada/sem_ch12.adb
index d5280cea712..fbfc2db7f9a 100644
--- a/gcc/ada/sem_ch12.adb
+++ b/gcc/ada/sem_ch12.adb
@@ -7710,6 +7710,9 @@ package body Sem_Ch12 is
             Prepend_Elmt (Typ, Exchanged_Views);
             Exchange_Declarations (Etype (Get_Associated_Node (N)));
 
+         --  Check that the available views of Typ match their respective flag.
+         --  Note that the type of a visible discriminant is never private.
+
          else
             Check_Private_Type (Typ, Has_Private_View (N));
 
@@ -7720,6 +7723,20 @@ package body Sem_Ch12 is
             elsif Is_Array_Type (Typ) then
                Check_Private_Type
                  (Component_Type (Typ), Has_Secondary_Private_View (N));
+
+            elsif (Is_Record_Type (Typ) or else Is_Concurrent_Type (Typ))
+              and then Has_Discriminants (Typ)
+            then
+               declare
+                  Disc : Entity_Id;
+
+               begin
+                  Disc := First_Discriminant (Typ);
+                  while Present (Disc) loop
+                     Check_Private_Type (Etype (Disc), False);
+                     Next_Discriminant (Disc);
+                  end loop;
+               end;
             end if;
          end if;
       end if;