[multiple changes]

2011-08-01  Thomas Quinot  <quinot@adacore.com>

	* sem_ch6.adb (Enter_Overloaded_Entity): Do not warn about a
	declaration being hidden when overriding an implicit inherited
	subprogram.
	* par-ch10.adb (P_Compilation_Unit): In syntax check only mode
	(-gnats), do not complain about a source file that contains only a
	pragma No_Body.

2011-08-01  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch5.adb (Analyze_Iterator_Scheme): Do not overwrite type of loop
	variable if already set.

From-SVN: r177046

gcc/ada/ChangeLog

+2011-08-01  Thomas Quinot  <quinot@adacore.com>
+
+	* sem_ch6.adb (Enter_Overloaded_Entity): Do not warn about a
+	declaration being hidden when overriding an implicit inherited
+	subprogram.
+	* par-ch10.adb (P_Compilation_Unit): In syntax check only mode
+	(-gnats), do not complain about a source file that contains only a
+	pragma No_Body.
+
+2011-08-01  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch5.adb (Analyze_Iterator_Scheme): Do not overwrite type of loop
+	variable if already set.
+
 2011-08-01  Arnaud Charlet  <charlet@adacore.com>
 
 	* g-socket-dummy.adb, s-osinte-linux.ads, g-socket-dummy.ads,

gcc/ada/par-ch10.adb

@@ -114,6 +114,7 @@ package body Ch10 is
       Config_Pragmas     : List_Id;
       P                  : Node_Id;
       SR_Present         : Boolean;
+      No_Body            : Boolean;
 
       Cunit_Error_Flag : Boolean := False;
       --  This flag is set True if we have to scan for a compilation unit
@@ -145,6 +146,10 @@ package body Ch10 is
 
       SR_Present := False;
 
+      --  If we see a pragma No_Body, remember not to complain about no body
+
+      No_Body := False;
+
       if Token = Tok_Pragma then
          Save_Scan_State (Scan_State);
          Item := P_Pragma;
@@ -179,6 +184,10 @@ package body Ch10 is
          Save_Scan_State (Scan_State);
          Item := P_Pragma;
 
+         if Item /= Error and then Pragma_Name (Item) = Name_No_Body then
+            No_Body := True;
+         end if;
+
          if Item = Error
            or else not Is_Configuration_Pragma_Name (Pragma_Name (Item))
          then
@@ -301,7 +310,12 @@ package body Ch10 is
 
          else
             if Operating_Mode = Check_Syntax and then Token = Tok_EOF then
-               Error_Msg_SC ("?file contains no compilation units");
+
+               --  Do not complain if there is a pragma No_Body
+
+               if not No_Body then
+                  Error_Msg_SC ("?file contains no compilation units");
+               end if;
             else
                Error_Msg_SC ("compilation unit expected");
                Cunit_Error_Flag := True;

gcc/ada/sem_ch5.adb

@@ -1947,7 +1947,16 @@ package body Sem_Ch5 is
                Make_Index (DS, LP);
 
                Set_Ekind (Id, E_Loop_Parameter);
-               Set_Etype (Id, Etype (DS));
+
+               --  If the loop is part of a predicate or precondition, it may
+               --  be analyzed twice, once in the source and once on the copy
+               --  used to check conformance. Preserve the original itype
+               --  because the second one may be created in a different scope,
+               --  e.g. a precondition procedure, leading to a crash in GIGI.
+
+               if No (Etype (Id)) or else Etype (Id) = Any_Type then
+                  Set_Etype (Id, Etype (DS));
+               end if;
 
                --  Treat a range as an implicit reference to the type, to
                --  inhibit spurious warnings.

gcc/ada/sem_ch6.adb

@@ -6048,7 +6048,13 @@ package body Sem_Ch6 is
             --  of the real danger that different operators may be applied in
             --  various parts of the program.
 
-            if (not Is_Overloadable (E) or else Subtype_Conformant (E, S))
+            --  Note that if E and S have the same scope, there is never any
+            --  hiding. Either the two conflict, and the program is illegal,
+            --  or S is overriding an implicit inherited subprogram.
+
+            if Scope (E) /= Scope (S)
+                  and then (not Is_Overloadable (E)
+                              or else Subtype_Conformant (E, S))
                   and then (Is_Immediately_Visible (E)
                               or else
                             Is_Potentially_Use_Visible (S))
@@ -6059,8 +6065,7 @@ package body Sem_Ch6 is
 
                elsif Nkind (S) = N_Defining_Operator_Symbol
                  and then
-                   Scope (
-                     Base_Type (Etype (First_Formal (S)))) /= Scope (S)
+                   Scope (Base_Type (Etype (First_Formal (S)))) /= Scope (S)
                then
                   Error_Msg_N
                     ("declaration of & hides predefined operator?", S);