[COMMITTED] ada: Adjust locations in aspects on generic formal subprograms

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

From: Piotr Trojanek <trojanek@adacore.com>

When instantiating a generic that has formal subprogram parameter with
contracts, e.g.:

  generic
    with procedure P with Pre => ..., Post => ...;
  ...

we create a wrapper that executes Pre/Post contracts before/after
calling the actual subprogram. Errors emitted for these contracts
will now have locations of the instance and not just of the generic.

gcc/ada/

	* sem_ch12.adb (Build_Subprogram_Wrappers): Adjust slocs of the
	copied aspects, just like we do in Build_Class_Wide_Expression for
	inherited class-wide contracts.

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

---
 gcc/ada/sem_ch12.adb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gcc/ada/sem_ch12.adb b/gcc/ada/sem_ch12.adb
index 03ce5d51a03..72c2eef7061 100644
--- a/gcc/ada/sem_ch12.adb
+++ b/gcc/ada/sem_ch12.adb
@@ -1203,12 +1203,31 @@ package body Sem_Ch12 is
       -------------------------------
 
       procedure Build_Subprogram_Wrappers is
+         function Adjust_Aspect_Sloc (N : Node_Id) return Traverse_Result;
+         --  Adjust sloc so that errors located at N will be reported with
+         --  information about the instance and not just about the generic.
+
+         ------------------------
+         -- Adjust_Aspect_Sloc --
+         ------------------------
+
+         function Adjust_Aspect_Sloc (N : Node_Id) return Traverse_Result is
+         begin
+            Adjust_Instantiation_Sloc (N, S_Adjustment);
+            return OK;
+         end Adjust_Aspect_Sloc;
+
+         procedure Adjust_Aspect_Slocs is new
+           Traverse_Proc (Adjust_Aspect_Sloc);
+
          Formal : constant Entity_Id :=
            Defining_Unit_Name (Specification (Analyzed_Formal));
          Aspect_Spec : Node_Id;
          Decl_Node   : Node_Id;
          Actual_Name : Node_Id;
 
+      --  Start of processing for Build_Subprogram_Wrappers
+
       begin
          --  Create declaration for wrapper subprogram
          --  The actual can be overloaded, in which case it will be
@@ -1247,6 +1266,7 @@ package body Sem_Ch12 is
 
          Aspect_Spec := First (Aspect_Specifications (Decl_Node));
          while Present (Aspect_Spec) loop
+            Adjust_Aspect_Slocs (Aspect_Spec);
             Set_Analyzed (Aspect_Spec, False);
             Next (Aspect_Spec);
          end loop;
-- 
2.34.1