From a3e2584e85d91d0ab076c3f603bc0179921dbd82 Mon Sep 17 00:00:00 2001
From: Piotr Trojanek <trojanek@adacore.com>
Date: Fri, 29 Jan 2021 12:16:17 +0100
Subject: [PATCH] [Ada] Attribute Address is not an interfering context in
 SPARK

gcc/ada/

	* sem_res.adb (Flag_Object): Ignore prefixes of attribute
	Address.
---
 gcc/ada/sem_res.adb | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index bd950f5df86..898f317f8f4 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -3749,6 +3749,19 @@ package body Sem_Res is
 
          begin
             case Nkind (N) is
+
+               --  Do not consider object name appearing in the prefix of
+               --  attribute Address as a read.
+
+               when N_Attribute_Reference =>
+
+                  --  Prefix of attribute Address denotes an object, program
+                  --  unit, or label; none of them needs to be flagged here.
+
+                  if Attribute_Name (N) = Name_Address then
+                     return Skip;
+                  end if;
+
                --  Do not consider nested function calls because they have
                --  already been processed during their own resolution.