[COMMITTED] ada: Bad internal naming when using pragma Compile_Time_Error

["Marc Poulhiès" <poulhies@adacore.com>]

From: Justin Squirek <squirek@adacore.com>

This patch fixes an error in the compiler whereby the presence of a condition
which tests the size of a type not known at compile time within an instance
of pragma Compile_Time_Error causes incorrect internal names to be generated
for said type during expansion.

gcc/ada/

	* sem_prag.adb (Defer_Compile_Time_Warning_Error_To_BE): Better
	handle itypes such that the tree copy required for the expansion
	of the pragma doesn't cause ordering problems with internal names.

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

---
 gcc/ada/sem_prag.adb | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/sem_prag.adb b/gcc/ada/sem_prag.adb
index fa2a4cbed39..a2996137648 100644
--- a/gcc/ada/sem_prag.adb
+++ b/gcc/ada/sem_prag.adb
@@ -33812,7 +33812,23 @@ package body Sem_Prag is
       --  as 0.
 
       if not In_Extended_Main_Code_Unit (N) then
-         Insert_Library_Level_Action (New_Copy_Tree (N));
+         --  We've created an Itype for the string in this pragma and
+         --  may have made other Itypes. When we copy the entire tree
+         --  of this pragma, we'll make a second copy of them in its
+         --  unit, which will mess up the numbering of the remaining
+         --  internal names.
+
+         declare
+            Saved_Current_Sem_Unit : constant Unit_Number_Type :=
+              Current_Sem_Unit;
+            New_N                  : Node_Id;
+
+         begin
+            Current_Sem_Unit := Main_Unit;
+            New_N := New_Copy_Tree (N);
+            Current_Sem_Unit := Saved_Current_Sem_Unit;
+            Insert_Library_Level_Action (New_N);
+         end;
       end if;
    end Defer_Compile_Time_Warning_Error_To_BE;
 
-- 
2.43.2