[gcc r12-4172] [Ada] Mark private component renaming as coming from source

[Pierre-Marie de Rodat <pmderodat@gcc.gnu.org>]

https://gcc.gnu.org/g:b1657ff3a089785542938216e011f454be03ed89

commit r12-4172-gb1657ff3a089785542938216e011f454be03ed89
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Thu Sep 23 12:06:42 2021 +0200

    [Ada] Mark private component renaming as coming from source
    
    gcc/ada/
    
            * exp_ch9.adb (Install_Private_Data_Declarations): Copy the Sloc of
            components for the local renamings as well as the Comes_From_Source
            flag, and also set Warnings_Off on them.  Use Nam local variable.

Diff:
---
 gcc/ada/exp_ch9.adb | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/gcc/ada/exp_ch9.adb b/gcc/ada/exp_ch9.adb
index dec41eed2f8..694cf9047ad 100644
--- a/gcc/ada/exp_ch9.adb
+++ b/gcc/ada/exp_ch9.adb
@@ -13796,14 +13796,15 @@ package body Exp_Ch9 is
                Comp    : Node_Id;
                Comp_Id : Entity_Id;
                Decl_Id : Entity_Id;
+               Nam     : Name_Id;
 
             begin
                Comp := First (Private_Declarations (Def));
                while Present (Comp) loop
                   if Nkind (Comp) = N_Component_Declaration then
                      Comp_Id := Defining_Identifier (Comp);
-                     Decl_Id :=
-                       Make_Defining_Identifier (Loc, Chars (Comp_Id));
+                     Nam     := Chars (Comp_Id);
+                     Decl_Id := Make_Defining_Identifier (Sloc (Comp_Id), Nam);
 
                      --  Minimal decoration
 
@@ -13818,6 +13819,14 @@ package body Exp_Ch9 is
                      Set_Is_Aliased     (Decl_Id, Is_Aliased     (Comp_Id));
                      Set_Is_Independent (Decl_Id, Is_Independent (Comp_Id));
 
+                     --  Copy the Comes_From_Source flag of the component, as
+                     --  the renaming may be the only entity directly seen by
+                     --  the user in the context, but do not warn for it.
+
+                     Set_Comes_From_Source
+                       (Decl_Id, Comes_From_Source (Comp_Id));
+                     Set_Warnings_Off (Decl_Id);
+
                      --  Generate:
                      --    comp_name : comp_typ renames _object.comp_name;
 
@@ -13828,10 +13837,8 @@ package body Exp_Ch9 is
                            New_Occurrence_Of (Etype (Comp_Id), Loc),
                          Name =>
                            Make_Selected_Component (Loc,
-                             Prefix =>
-                               New_Occurrence_Of (Obj_Ent, Loc),
-                             Selector_Name =>
-                               Make_Identifier (Loc, Chars (Comp_Id))));
+                             Prefix => New_Occurrence_Of (Obj_Ent, Loc),
+                             Selector_Name => Make_Identifier (Loc, Nam)));
                      Add (Decl);
                   end if;