[multiple changes]

2009-04-20  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch4.adb (Analyze_User_Defined_Binary_Op): If left operand is
	overloaded and one interpretation matches the context, label the
	operand with the type of first formal.

2009-04-20  Bob Duff  <duff@adacore.com>

	* debug.ads: Minor comment fix.

	* debug.adb: Minor comment fixes.

2009-04-20  Javier Miranda  <miranda@adacore.com>

	* rtsfind.ads (RE_Null_Id): New entity of package Ada.Exceptions

	* exp_ch6.adb (Expand_Inlined_Call): Undo previous patch.

	* exp_ch11.adb (Expand_N_Raise_Statement): When the raise stmt
	is expanded into a call to Raise_Exception, avoid passing the
	exception-name'identity in runtimes in which this argument
	is not used.

From-SVN: r146416

gcc/ada/ChangeLog

+2009-04-20  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch4.adb (Analyze_User_Defined_Binary_Op): If left operand is
+	overloaded and one interpretation matches the context, label the
+	operand with the type of first formal.
+
+2009-04-20  Bob Duff  <duff@adacore.com>
+
+	* debug.ads: Minor comment fix.
+
+	* debug.adb: Minor comment fixes.
+
+2009-04-20  Javier Miranda  <miranda@adacore.com>
+
+	* rtsfind.ads (RE_Null_Id): New entity of package Ada.Exceptions
+
+	* exp_ch6.adb (Expand_Inlined_Call): Undo previous patch.
+
+	* exp_ch11.adb (Expand_N_Raise_Statement): When the raise stmt
+	is expanded into a call to Raise_Exception, avoid passing the
+	exception-name'identity in runtimes in which this argument
+	is not used.
+
 2009-04-20  Jerome Lambourg  <lambourg@adacore.com>
 
 	* impunit.adb: Add i-cil and i-cilobj packages, now needed by the

gcc/ada/debug.adb

@@ -191,7 +191,7 @@ package body Debug is
    --  dc
    --  dd
    --  de
-   --  df
+   --  df  Only output file names, not path names, in log
    --  dg
    --  dh
    --  di
@@ -428,8 +428,6 @@ package body Debug is
    --       in preelaborable packages, but this restriction is a huge pain,
    --       especially in the predefined library units.
 
-   --  dQ   needs full documentation ???
-
    --  dR   Bypass the check for a proper version of s-rpc being present
    --       to use the -gnatz? switch. This allows debugging of the use
    --       of stubs generation without needing to have GLADE (or some
@@ -612,6 +610,10 @@ package body Debug is
    --      be listed, and is useful when diagnosing circularities introduced
    --      by incorrect changes to the run-time library itself.
 
+   --  db  Output debug information from Better_Choice in Binde, which uses
+   --      various heuristics to determine elaboration order in cases where
+   --      multiple orders are valid.
+
    --  dc  List units as they are chosen. As units are selected for addition to
    --      the elaboration order, a line of output is generated showing which
    --      unit has been selected.

gcc/ada/debug.ads

@@ -40,14 +40,13 @@ package Debug is
    -- Dynamic Debug Flags --
    -------------------------
 
-   --  Sixty two flags that can be used to active various specialized
-   --  debugging output information. The flags are preset to False, which
-   --  corresponds to the given output being suppressed. The individual
-   --  flags can be turned on using the undocumented switch dxxx where
-   --  xxx is a string of letters for flags to be turned on. Documentation
-   --  on the current usage of these flags is contained in the body of Debug
-   --  rather than the spec, so that we don't have to recompile the world
-   --  when a new debug flag is added
+   --  Flags that can be used to active various specialized debugging output
+   --  information. The flags are preset to False, which corresponds to the
+   --  given output being suppressed. The individual flags can be turned on
+   --  using the undocumented switch dxxx where xxx is a string of letters for
+   --  flags to be turned on. Documentation on the current usage of these flags
+   --  is contained in the body of Debug rather than the spec, so that we don't
+   --  have to recompile the world when a new debug flag is added.
 
    Debug_Flag_A : Boolean := False;
    Debug_Flag_B : Boolean := False;

gcc/ada/exp_ch11.adb

@@ -35,9 +35,9 @@ with Namet;    use Namet;
 with Nlists;   use Nlists;
 with Nmake;    use Nmake;
 with Opt;      use Opt;
-with Rtsfind;  use Rtsfind;
 with Restrict; use Restrict;
 with Rident;   use Rident;
+with Rtsfind;  use Rtsfind;
 with Sem;      use Sem;
 with Sem_Ch8;  use Sem_Ch8;
 with Sem_Res;  use Sem_Res;
@@ -1407,14 +1407,33 @@ package body Exp_Ch11 is
       --  and there is nothing else to do.
 
       if Present (Expression (N)) then
-         Rewrite (N,
-           Make_Procedure_Call_Statement (Loc,
-             Name => New_Occurrence_Of (RTE (RE_Raise_Exception), Loc),
-             Parameter_Associations => New_List (
-               Make_Attribute_Reference (Loc,
-                 Prefix         => Name (N),
-                 Attribute_Name => Name_Identity),
-               Expression (N))));
+
+         --  Avoid passing exception-name'identity in runtimes in which this
+         --  argument is not used. This avoids generating undefined references
+         --  to these exceptions when compiling with no optimization
+
+         if Configurable_Run_Time_On_Target
+           and then (Restriction_Active (No_Exception_Handlers)
+                       or else
+                     Restriction_Active (No_Exception_Propagation))
+         then
+            Rewrite (N,
+              Make_Procedure_Call_Statement (Loc,
+                Name => New_Occurrence_Of (RTE (RE_Raise_Exception), Loc),
+                Parameter_Associations => New_List (
+                  New_Occurrence_Of (RTE (RE_Null_Id), Loc),
+                  Expression (N))));
+         else
+            Rewrite (N,
+              Make_Procedure_Call_Statement (Loc,
+                Name => New_Occurrence_Of (RTE (RE_Raise_Exception), Loc),
+                Parameter_Associations => New_List (
+                  Make_Attribute_Reference (Loc,
+                    Prefix         => Name (N),
+                    Attribute_Name => Name_Identity),
+                  Expression (N))));
+         end if;
+
          Analyze (N);
          return;
       end if;

gcc/ada/exp_ch6.adb

@@ -3670,16 +3670,6 @@ package body Exp_Ch6 is
             return;
          end if;
 
-         --  Avoid generation of temporaries for unreferenced formals
-
-         --  What is going on here ??? test below is for *PRAGMA* unreferenced
-         --  not for an unreferenced formal. Is this a bug fix, or simply an
-         --  optimization. Needs comment fix and explanation ???
-
-         if Has_Pragma_Unreferenced (F) then
-            goto Continue;
-         end if;
-
          --  If the argument may be a controlling argument in a call within
          --  the inlined body, we must preserve its classwide nature to insure
          --  that dynamic dispatching take place subsequently. If the formal
@@ -3800,7 +3790,6 @@ package body Exp_Ch6 is
             Set_Renamed_Object (F, Temp);
          end if;
 
-         <<Continue>>
          Next_Formal (F);
          Next_Actual (A);
       end loop;

gcc/ada/rtsfind.ads

@@ -490,6 +490,7 @@ package Rtsfind is
      RE_Exception_Message,               -- Ada.Exceptions
      RE_Exception_Name_Simple,           -- Ada.Exceptions
      RE_Exception_Occurrence,            -- Ada.Exceptions
+     RE_Null_Id,                         -- Ada.Exceptions
      RE_Null_Occurrence,                 -- Ada.Exceptions
      RE_Poll,                            -- Ada.Exceptions
      RE_Raise_Exception,                 -- Ada.Exceptions
@@ -1652,6 +1653,7 @@ package Rtsfind is
      RE_Exception_Message                => Ada_Exceptions,
      RE_Exception_Name_Simple            => Ada_Exceptions,
      RE_Exception_Occurrence             => Ada_Exceptions,
+     RE_Null_Id                          => Ada_Exceptions,
      RE_Null_Occurrence                  => Ada_Exceptions,
      RE_Poll                             => Ada_Exceptions,
      RE_Raise_Exception                  => Ada_Exceptions,

gcc/ada/sem_ch4.adb

@@ -3918,6 +3918,18 @@ package body Sem_Ch4 is
             then
                Add_One_Interp (N, Op_Id, Etype (Op_Id));
 
+               --  If the left operand is overloaded, indicate that the
+               --  current type is a viable candidate. This is redundant
+               --  in most cases, but for equality and comparison operators
+               --  where the context does not impose a type on the operands,
+               --  setting the proper type is necessary to avoid subsequent
+               --  ambiguities during resolution, when both user-defined and
+               --  predefined operators may be candidates.
+
+               if Is_Overloaded (Left_Opnd (N)) then
+                  Set_Etype (Left_Opnd (N), Etype (F1));
+               end if;
+
                if Debug_Flag_E then
                   Write_Str ("user defined operator ");
                   Write_Name (Chars (Op_Id));