[COMMITTED] ada: Add comment describing Partition_Elaboration_Policy dependency.

[COMMITTED] ada: Add comment describing Partition_Elaboration_Policy dependency.

[Marc Poulhiès]

From: Steve Baird <baird@adacore.com>

Add a comment in the spec for the default (as opposed to hie) version of
Ada.Real_Time.Timing_Events indicating that it is incompatible with a
a Partition_Elaboration_Policy specification specifying a policy other than
Concurrent.

gcc/ada/

	* libgnarl/a-rttiev.ads: add a comment

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/libgnarl/a-rttiev.ads | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gcc/ada/libgnarl/a-rttiev.ads b/gcc/ada/libgnarl/a-rttiev.ads
index cb272dfb759..3fa7d6097f6 100644
--- a/gcc/ada/libgnarl/a-rttiev.ads
+++ b/gcc/ada/libgnarl/a-rttiev.ads
@@ -61,6 +61,12 @@ package Ada.Real_Time.Timing_Events is
 
    function Time_Of_Event (Event : Timing_Event) return Time;
 
+   --  The compilation closure of this version (as opposed to the hie version)
+   --  of Ada.Real_TIme.Timing_Events includes a specification of a
+   --  Concurrent Partition_Elaboration_Policy. Thus, a bind-time error
+   --  will result if this unit occurs in the same partition as a conflicting
+   --  Partition_Elaboration_Policy specification.
+
 private
 
    type Timing_Event is new Ada.Finalization.Limited_Controlled with record
-- 
2.42.0