Explicit External aspect was an equivalant to an implicit default.  It was only
needed as a workaround for a frontend bug. (If it meant to serve as
documentation, there should be explicit Effective_Reads and Effective_Writes
set to False too.)

No test, because these changes are semantically neutral.

Tested on x86_64-pc-linux-gnu, committed on trunk

2018-05-21  Piotr Trojanek  <troja...@adacore.com>

gcc/ada/

        * libgnarl/a-reatim.ads (Clock_Time): Remove External aspect.
        * libgnarl/a-taside.ads (Tasking_State): Likewise.
        * libgnat/a-calend.ads (Clock_Time): Likewise.
--- gcc/ada/libgnarl/a-reatim.ads
+++ gcc/ada/libgnarl/a-reatim.ads
@@ -38,9 +38,7 @@ pragma Elaborate_All (System.Task_Primitives.Operations);
 
 package Ada.Real_Time with
   SPARK_Mode,
-  Abstract_State => (Clock_Time with Synchronous,
-                                     External => (Async_Readers,
-                                                  Async_Writers)),
+  Abstract_State => (Clock_Time with Synchronous),
   Initializes    => Clock_Time
 is
 

--- gcc/ada/libgnarl/a-taside.ads
+++ gcc/ada/libgnarl/a-taside.ads
@@ -38,9 +38,7 @@ with System.Tasking;
 
 package Ada.Task_Identification with
   SPARK_Mode,
-  Abstract_State => (Tasking_State with Synchronous,
-                                        External => (Async_Readers,
-                                                     Async_Writers)),
+  Abstract_State => (Tasking_State with Synchronous),
   Initializes    => Tasking_State
 is
    pragma Preelaborate;

--- gcc/ada/libgnat/a-calend.ads
+++ gcc/ada/libgnat/a-calend.ads
@@ -35,9 +35,7 @@
 
 package Ada.Calendar with
   SPARK_Mode,
-  Abstract_State => (Clock_Time with Synchronous,
-                                     External => (Async_Readers,
-                                                  Async_Writers)),
+  Abstract_State => (Clock_Time with Synchronous),
   Initializes    => Clock_Time
 is
 

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