[multiple changes]

2017-04-25  Bob Duff  <duff@adacore.com>

	* sem_ch8.adb (Use_One_Type): If a use_type_clause
	is redundant, set its Used_Operations to empty. This is only
	necessary for use clauses that appear in the parent of a generic
	child unit, because those use clauses get reanalyzed when we
	instantiate the generic, and we don't want the Used_Operations
	carried over from the original context (where it was probably
	not redundant).

2017-04-25  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_ch6.adb: Minor reformatting.

From-SVN: r247169

gcc/ada/ChangeLog

 2017-04-25  Bob Duff  <duff@adacore.com>
 
+	* sem_ch8.adb (Use_One_Type): If a use_type_clause
+	is redundant, set its Used_Operations to empty. This is only
+	necessary for use clauses that appear in the parent of a generic
+	child unit, because those use clauses get reanalyzed when we
+	instantiate the generic, and we don't want the Used_Operations
+	carried over from the original context (where it was probably
+	not redundant).
+
+2017-04-25  Hristian Kirtchev  <kirtchev@adacore.com>
+
+	* exp_ch6.adb: Minor reformatting.
+
+2017-04-25  Bob Duff  <duff@adacore.com>
+
 	* sem_prag.adb (Process_Restrictions_Or_Restriction_Warnings):
 	Use Source_Index (Current_Sem_Unit) to find the correct casing.
 	* exp_prag.adb (Expand_Pragma_Check): Use Source_Index

gcc/ada/exp_ch6.adb

@@ -6635,10 +6635,10 @@ package body Exp_Ch6 is
                    Attribute_Name => Name_Tag);
             end if;
 
-            if not CodePeer_Mode then
-               --  CodePeer doesn't do anything useful with
-               --  Ada.Tags.Type_Specific_Data components
+            --  CodePeer does not do anything useful with
+            --  Ada.Tags.Type_Specific_Data components.
 
+            if not CodePeer_Mode then
                Insert_Action (Exp,
                  Make_Raise_Program_Error (Loc,
                    Condition =>
@@ -6647,7 +6647,7 @@ package body Exp_Ch6 is
                        Right_Opnd =>
                          Make_Integer_Literal (Loc,
                            Scope_Depth (Enclosing_Dynamic_Scope (Scope_Id)))),
-                   Reason => PE_Accessibility_Check_Failed));
+                   Reason    => PE_Accessibility_Check_Failed));
             end if;
          end;
 

gcc/ada/sem_ch8.adb

@@ -9200,11 +9200,22 @@ package body Sem_Ch8 is
            ("incomplete type from limited view "
             & "cannot appear in use clause", Id);
 
+      --  If the use clause is redundant, Used_Operations will usually be
+      --  empty, but we need to set it to empty here in one case: If we are
+      --  instantiating a generic library unit, then we install the ancestors
+      --  of that unit in the scope stack, which involves reprocessing use
+      --  clauses in those ancestors. Such a use clause will typically have a
+      --  nonempty Used_Operations unless it was redundant in the generic unit,
+      --  even if it is redundant at the place of the instantiation.
+
+      elsif Redundant_Use (Id) then
+         Set_Used_Operations (Parent (Id), New_Elmt_List);
+
       --  If the subtype mark designates a subtype in a different package,
       --  we have to check that the parent type is visible, otherwise the
       --  use type clause is a noop. Not clear how to do that???
 
-      elsif not Redundant_Use (Id) then
+      else
          Set_In_Use (T);
 
          --  If T is tagged, primitive operators on class-wide operands