[gcc r13-1483] [Ada] Spurious error on qualified prefix in Pack.Func'Result

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

https://gcc.gnu.org/g:1f85342b42b4bf9fee3cd23bc38498a3565bc9f1

commit r13-1483-g1f85342b42b4bf9fee3cd23bc38498a3565bc9f1
Author: Yannick Moy <moy@adacore.com>
Date:   Mon May 23 14:27:41 2022 +0200

    [Ada] Spurious error on qualified prefix in Pack.Func'Result
    
    When using a qualified name such as Pack.Func as the prefix of a 'Result
    attribute reference, the prefix is not fully resolved and may contain a
    chain of homonyms. Look for the expected function in the homonym chain
    instead of issuing an error if the first one is not the expected one.
    
    gcc/ada/
    
            * sem_attr.adb (Analyze_Attribute): Take into account the
            possibility of homonyms.

Diff:
---
 gcc/ada/sem_attr.adb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gcc/ada/sem_attr.adb b/gcc/ada/sem_attr.adb
index 6a35358261e..b8d878c3d6d 100644
--- a/gcc/ada/sem_attr.adb
+++ b/gcc/ada/sem_attr.adb
@@ -5835,6 +5835,12 @@ package body Sem_Attr is
 
             elsif Present (Over_Id) and then Pref_Id = Over_Id then
                return True;
+
+            --  When a qualified name is used for the prefix, homonyms may come
+            --  before the current function in the homonym chain.
+
+            elsif Has_Homonym (Pref_Id) then
+               return Denote_Same_Function (Homonym (Pref_Id), Spec_Id);
             end if;
 
             --  Otherwise the prefix does not denote the related subprogram