[gcc r12-3819] [Ada] Spurious error on deferred constant with predicate

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

https://gcc.gnu.org/g:03b6cc3b3e60379f10a4b055e431488ab10a1760

commit r12-3819-g03b6cc3b3e60379f10a4b055e431488ab10a1760
Author: Yannick Moy <moy@adacore.com>
Date:   Tue Jul 27 12:20:41 2021 +0200

    [Ada] Spurious error on deferred constant with predicate
    
    gcc/ada/
    
            * sem_ch3.adb (Analyze_Object_Declaration): Do not insert a
            predicate check after a deferred constant declaration.

Diff:
---
 gcc/ada/sem_ch3.adb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/sem_ch3.adb b/gcc/ada/sem_ch3.adb
index 0e36cc22837..7ba6f7b3bf9 100644
--- a/gcc/ada/sem_ch3.adb
+++ b/gcc/ada/sem_ch3.adb
@@ -4505,7 +4505,7 @@ package body Sem_Ch3 is
       --  default initial value (including via a Default_Value or
       --  Default_Component_Value aspect, see AI12-0301) and then this is not
       --  an internal declaration whose initialization comes later (as for an
-      --  aggregate expansion).
+      --  aggregate expansion) or a deferred constant.
       --  If expression is an aggregate it may be expanded into assignments
       --  and the declaration itself is marked with No_Initialization, but
       --  the predicate still applies.
@@ -4519,6 +4519,7 @@ package body Sem_Ch3 is
           (Present (E)
             or else
               Is_Partially_Initialized_Type (T, Include_Implicit => False))
+        and then not (Constant_Present (N) and then No (E))
       then
          --  If the type has a static predicate and the expression is known at
          --  compile time, see if the expression satisfies the predicate.