[gcc r14-1769] ada: Skip elaboration checks for abstract subprograms on derived types

[gcc r14-1769] ada: Skip elaboration checks for abstract subprograms on derived types

[Marc Poulhi?s]

https://gcc.gnu.org/g:204dba400b42b75271071b05102a5b46fd2a34d0

commit r14-1769-g204dba400b42b75271071b05102a5b46fd2a34d0
Author: Piotr Trojanek <trojanek@adacore.com>
Date:   Tue May 2 12:49:43 2023 +0200

    ada: Skip elaboration checks for abstract subprograms on derived types
    
    Elaboration checks skip abstract subprogram declarations, which have no
    body that could be examined. Now these checks also skip abstract
    subprograms of a derived type, which have no body either.
    
    gcc/ada/
    
            * sem_elab.adb (Check_Overriding_Primitive): Prevent Corresponding_Body
            to be called with entity of an abstract subprogram.

Diff:
---
 gcc/ada/sem_elab.adb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/sem_elab.adb b/gcc/ada/sem_elab.adb
index 1e18b987863..dc81e47da9e 100644
--- a/gcc/ada/sem_elab.adb
+++ b/gcc/ada/sem_elab.adb
@@ -15263,10 +15263,13 @@ package body Sem_Elab is
             --  Nothing to do for predefined primitives because they are
             --  artifacts of tagged type expansion and cannot override source
             --  primitives. Nothing to do as well for inherited primitives, as
-            --  the check concerns overriding ones.
+            --  the check concerns overriding ones. Finally, nothing to do for
+            --  abstract subprograms, because they have no body that could be
+            --  examined.
 
             if Is_Predefined_Dispatching_Operation (Prim)
               or else not Is_Overriding_Subprogram (Prim)
+              or else Is_Abstract_Subprogram (Prim)
             then
                return;
             end if;