[gcc r12-4157] [Ada] Propagate Ghost status from parent to derived subprograms

[Pierre-Marie de Rodat]

https://gcc.gnu.org/g:cc1fcd387984da9cde6d7314345d366789929d57

commit r12-4157-gcc1fcd387984da9cde6d7314345d366789929d57
Author: Piotr Trojanek <trojanek@adacore.com>
Date:   Fri Sep 10 22:27:20 2021 +0200

    [Ada] Propagate Ghost status from parent to derived subprograms
    
    gcc/ada/
    
            * sem_ch3.adb (Derive_Subprogram): Copy ghost status from parent
            to derived subprogram.

Diff:
---
 gcc/ada/sem_ch3.adb | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gcc/ada/sem_ch3.adb b/gcc/ada/sem_ch3.adb
index bf81f763faa..f1a56ad2b77 100644
--- a/gcc/ada/sem_ch3.adb
+++ b/gcc/ada/sem_ch3.adb
@@ -16111,6 +16111,14 @@ package body Sem_Ch3 is
 
       Set_No_Return (New_Subp, No_Return (Parent_Subp));
 
+      --  If the parent subprogram is marked as Ghost, then so is the derived
+      --  subprogram. The ghost policy for the derived subprogram is set from
+      --  the effective ghost policy at the point of derived type declaration.
+
+      if Is_Ghost_Entity (Parent_Subp) then
+         Set_Is_Ghost_Entity (New_Subp);
+      end if;
+
       --  A derived function with a controlling result is abstract. If the
       --  Derived_Type is a nonabstract formal generic derived type, then
       --  inherited operations are not abstract: the required check is done at