Make the stack non-executable in GNAT tools

Due to PR67205, the deeply nested instantiations require trampolines,
which in turn requires an executable stack for the GNAT tools on
architectures such as x86_64.

From-SVN: r227004

gcc/ChangeLog

+2015-08-13  Florian Weimer  <fweimer@redhat.com>
+
+	* prj.adb (For_Every_Project_Imported_Context.Recursive_Check_Context):
+	Move Name_Id_Set instantiation to the Prj package, to avoid trampolines.
+	* prj-proc.adb (Process.Process_Expression_Variable_Decl):
+	Move Name_Ids instantiation to the Prj.Proc package, to avoid
+	trampolines.
+
 2015-08-19  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/arm/arm.c (bounds_check): Use %wd print format

gcc/ada/prj-proc.adb

@@ -72,6 +72,8 @@ package body Prj.Proc is
       Equal      => "=");
    --  Stores the default values of 'Runtime names for the various languages
 
+   package Name_Ids is new Ada.Containers.Vectors (Positive, Name_Id);
+
    procedure Add (To_Exp : in out Name_Id; Str : Name_Id);
    --  Concatenate two strings and returns another string if both
    --  arguments are not null string.
@@ -2193,8 +2195,6 @@ package body Prj.Proc is
          if Is_Attribute and then Name = Snames.Name_Project_Path then
             if In_Tree.Is_Root_Tree then
                declare
-                  package Name_Ids is
-                    new Ada.Containers.Vectors (Positive, Name_Id);
                   Val  : String_List_Id := New_Value.Values;
                   List : Name_Ids.Vector;
                begin

gcc/ada/prj.adb

@@ -76,6 +76,9 @@ package body Prj is
                           All_Upper_Case => All_Upper_Case_Image'Access,
                           Mixed_Case     => Mixed_Case_Image'Access);
 
+   package Name_Id_Set is
+      new Ada.Containers.Ordered_Sets (Element_Type => Name_Id);
+
    procedure Free (Project : in out Project_Id);
    --  Free memory allocated for Project
 
@@ -589,9 +592,6 @@ package body Prj is
          In_Aggregate_Lib      : Boolean;
          From_Encapsulated_Lib : Boolean)
       is
-         package Name_Id_Set is
-           new Ada.Containers.Ordered_Sets (Element_Type => Name_Id);
-
          Seen_Name : Name_Id_Set.Set;
          --  This set is needed to ensure that we do not handle the same
          --  project twice in the context of aggregate libraries.