[Ada] Get rid of Frontend_Exceptions refs

diff --git a/gcc/ada/Makefile.rtl b/gcc/ada/Makefile.rtl
--- a/gcc/ada/Makefile.rtl
+++ b/gcc/ada/Makefile.rtl
@@ -1166,9 +1166,6 @@  ifeq ($(strip $(filter-out powerpc% wrs vxworks vxworksspe vxworks7% vxworks7spe
           s-vxwext.ads<libgnarl/s-vxwext__kernel.ads \
           s-vxwext.adb<libgnarl/s-vxwext__kernel.adb \
           system.ads<libgnat/$(SVX)-$(ARCH_STR)-kernel.ads
-        else
-          LIBGNAT_TARGET_PAIRS += \
-          system.ads<libgnat/system-vxworks-ppc.ads
         endif
       endif
       EXTRA_GNATRTL_NONTASKING_OBJS+=i-vxinco.o i-vxwork.o i-vxwoio.o
@@ -1315,9 +1312,6 @@  ifeq ($(strip $(filter-out %86 x86_64 wrs vxworks vxworks7%,$(target_cpu) $(targ
           s-vxwext.ads<libgnarl/s-vxwext__kernel.ads \
           s-vxwext.adb<libgnarl/s-vxwext__kernel.adb \
           system.ads<libgnat/$(SVX)-x86-kernel.ads
-        else
-          LIBGNAT_TARGET_PAIRS += \
-          system.ads<libgnat/system-vxworks-x86.ads
         endif
       endif
 


diff --git a/gcc/ada/libgnat/system-vxworks-ppc-ravenscar.ads /dev/null
deleted file mode 100644
--- a/gcc/ada/libgnat/system-vxworks-ppc-ravenscar.ads
+++ /dev/null
@@ -1,185 +0,0 @@ 
-------------------------------------------------------------------------------
---                                                                          --
---                        GNAT RUN-TIME COMPONENTS                          --
---                                                                          --
---                               S Y S T E M                                --
---                                                                          --
---                                 S p e c                                  --
---                   (VxWorks/HIE Ravenscar Version PPC)                    --
---                                                                          --
---          Copyright (C) 1992-2021, Free Software Foundation, Inc.         --
---                                                                          --
--- This specification is derived from the Ada Reference Manual for use with --
--- GNAT. The copyright notice above, and the license provisions that follow --
--- apply solely to the  contents of the part following the private keyword. --
---                                                                          --
--- GNAT is free software;  you can  redistribute it  and/or modify it under --
--- terms of the  GNU General Public License as published  by the Free Soft- --
--- ware  Foundation;  either version 3,  or (at your option) any later ver- --
--- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
---                                                                          --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception,   --
--- version 3.1, as published by the Free Software Foundation.               --
---                                                                          --
--- You should have received a copy of the GNU General Public License and    --
--- a copy of the GCC Runtime Library Exception along with this program;     --
--- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
--- <http://www.gnu.org/licenses/>.                                          --
---                                                                          --
--- GNAT was originally developed  by the GNAT team at  New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc.      --
---                                                                          --
-------------------------------------------------------------------------------
-
---  This is a Ravenscar VxWorks version of this package for PowerPC targets
-
-pragma Restrictions (No_Exception_Propagation);
---  Only local exception handling is supported in this profile
-
-pragma Restrictions (No_Exception_Registration);
---  Disable exception name registration. This capability is not used because
---  it is only required by exception stream attributes which are not supported
---  in this run time.
-
-pragma Restrictions (No_Implicit_Dynamic_Code);
---  Pointers to nested subprograms are not allowed in this run time, in order
---  to prevent the compiler from building "trampolines".
-
-pragma Restrictions (No_Finalization);
---  Controlled types are not supported in this run time
-
-pragma Profile (Ravenscar);
---  This is a Ravenscar run time
-
-pragma Discard_Names;
---  Disable explicitly the generation of names associated with entities in
---  order to reduce the amount of storage used. These names are not used anyway
---  (attributes such as 'Image and 'Value are not supported in this run time).
-
-package System is
-   pragma Pure;
-   --  Note that we take advantage of the implementation permission to make
-   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
-   --  2005, this is Pure in any case (AI-362).
-
-   pragma No_Elaboration_Code_All;
-   --  Allow the use of that restriction in units that WITH this unit
-
-   type Name is (SYSTEM_NAME_GNAT);
-   System_Name : constant Name := SYSTEM_NAME_GNAT;
-
-   --  System-Dependent Named Numbers
-
-   Min_Int             : constant := -2 ** (Standard'Max_Integer_Size - 1);
-   Max_Int             : constant :=  2 ** (Standard'Max_Integer_Size - 1) - 1;
-
-   Max_Binary_Modulus    : constant := 2 ** Standard'Max_Integer_Size;
-   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
-
-   Max_Base_Digits       : constant := Long_Long_Float'Digits;
-   Max_Digits            : constant := Long_Long_Float'Digits;
-
-   Max_Mantissa          : constant := Standard'Max_Integer_Size - 1;
-   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
-
-   Tick                  : constant := 1.0 / 60.0;
-
-   --  Storage-related Declarations
-
-   type Address is private;
-   pragma Preelaborable_Initialization (Address);
-   Null_Address : constant Address;
-
-   Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
-
-   --  Address comparison
-
-   function "<"  (Left, Right : Address) return Boolean;
-   function "<=" (Left, Right : Address) return Boolean;
-   function ">"  (Left, Right : Address) return Boolean;
-   function ">=" (Left, Right : Address) return Boolean;
-   function "="  (Left, Right : Address) return Boolean;
-
-   pragma Import (Intrinsic, "<");
-   pragma Import (Intrinsic, "<=");
-   pragma Import (Intrinsic, ">");
-   pragma Import (Intrinsic, ">=");
-   pragma Import (Intrinsic, "=");
-
-   --  Other System-Dependent Declarations
-
-   type Bit_Order is (High_Order_First, Low_Order_First);
-   Default_Bit_Order : constant Bit_Order := High_Order_First;
-   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
-
-   --  Priority-related Declarations (RM D.1)
-
-   --  Ada priorities are mapped to VxWorks priorities using the following
-   --  transformation: 255 - Ada Priority
-
-   --  Ada priorities are used as follows:
-
-   --  256        is reserved for the VxWorks kernel
-   --  248 - 255  correspond to hardware interrupt levels 0 .. 7
-   --  247        is a catchall default "interrupt" priority for signals,
-   --             allowing higher priority than normal tasks, but lower than
-   --             hardware priority levels.  Protected Object ceilings can
-   --             override these values.
-   --  246        is used by the Interrupt_Manager task
-
-   Max_Priority           : constant Positive := 245;
-   Max_Interrupt_Priority : constant Positive := 255;
-
-   subtype Any_Priority       is Integer      range   0 .. 255;
-   subtype Priority           is Any_Priority range   0 .. 245;
-   subtype Interrupt_Priority is Any_Priority range 246 .. 255;
-
-   Default_Priority : constant Priority := 122;
-
-private
-
-   type Address is mod Memory_Size;
-   Null_Address : constant Address := 0;
-
-   --------------------------------------
-   -- System Implementation Parameters --
-   --------------------------------------
-
-   --  These parameters provide information about the target that is used
-   --  by the compiler. They are in the private part of System, where they
-   --  can be accessed using the special circuitry in the Targparm unit
-   --  whose source should be consulted for more detailed descriptions
-   --  of the individual switch values.
-
-   Backend_Divide_Checks     : constant Boolean := False;
-   Backend_Overflow_Checks   : constant Boolean := True;
-   Command_Line_Args         : constant Boolean := False;
-   Configurable_Run_Time     : constant Boolean := True;
-   Denorm                    : constant Boolean := True;
-   Duration_32_Bits          : constant Boolean := True;
-   Exit_Status_Supported     : constant Boolean := True;
-   Machine_Overflows         : constant Boolean := True;
-   Machine_Rounds            : constant Boolean := True;
-   Preallocated_Stacks       : constant Boolean := False;
-   Signed_Zeros              : constant Boolean := True;
-   Stack_Check_Default       : constant Boolean := False;
-   Stack_Check_Probes        : constant Boolean := False;
-   Stack_Check_Limits        : constant Boolean := True;
-   Support_Aggregates        : constant Boolean := True;
-   Support_Composite_Assign  : constant Boolean := True;
-   Support_Composite_Compare : constant Boolean := True;
-   Support_Long_Shifts       : constant Boolean := True;
-   Always_Compatible_Rep     : constant Boolean := True;
-   Suppress_Standard_Library : constant Boolean := True;
-   Use_Ada_Main_Program_Name : constant Boolean := True;
-   Frontend_Exceptions       : constant Boolean := True;
-   ZCX_By_Default            : constant Boolean := False;
-
-   Executable_Extension : constant String := ".out";
-
-end System;


diff --git a/gcc/ada/libgnat/system-vxworks-ppc.ads /dev/null
deleted file mode 100644
--- a/gcc/ada/libgnat/system-vxworks-ppc.ads
+++ /dev/null
@@ -1,163 +0,0 @@ 
-------------------------------------------------------------------------------
---                                                                          --
---                        GNAT RUN-TIME COMPONENTS                          --
---                                                                          --
---                               S Y S T E M                                --
---                                                                          --
---                                 S p e c                                  --
---                         (VxWorks 5 Version PPC)                          --
---                                                                          --
---          Copyright (C) 1992-2021, Free Software Foundation, Inc.         --
---                                                                          --
--- This specification is derived from the Ada Reference Manual for use with --
--- GNAT. The copyright notice above, and the license provisions that follow --
--- apply solely to the  contents of the part following the private keyword. --
---                                                                          --
--- GNAT is free software;  you can  redistribute it  and/or modify it under --
--- terms of the  GNU General Public License as published  by the Free Soft- --
--- ware  Foundation;  either version 3,  or (at your option) any later ver- --
--- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
---                                                                          --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception,   --
--- version 3.1, as published by the Free Software Foundation.               --
---                                                                          --
--- You should have received a copy of the GNU General Public License and    --
--- a copy of the GCC Runtime Library Exception along with this program;     --
--- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
--- <http://www.gnu.org/licenses/>.                                          --
---                                                                          --
--- GNAT was originally developed  by the GNAT team at  New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc.      --
---                                                                          --
-------------------------------------------------------------------------------
-
-package System is
-   pragma Pure;
-   --  Note that we take advantage of the implementation permission to make
-   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
-   --  2005, this is Pure in any case (AI-362).
-
-   pragma No_Elaboration_Code_All;
-   --  Allow the use of that restriction in units that WITH this unit
-
-   type Name is (SYSTEM_NAME_GNAT);
-   System_Name : constant Name := SYSTEM_NAME_GNAT;
-
-   --  System-Dependent Named Numbers
-
-   Min_Int             : constant := -2 ** (Standard'Max_Integer_Size - 1);
-   Max_Int             : constant :=  2 ** (Standard'Max_Integer_Size - 1) - 1;
-
-   Max_Binary_Modulus    : constant := 2 ** Standard'Max_Integer_Size;
-   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
-
-   Max_Base_Digits       : constant := Long_Long_Float'Digits;
-   Max_Digits            : constant := Long_Long_Float'Digits;
-
-   Max_Mantissa          : constant := Standard'Max_Integer_Size - 1;
-   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
-
-   Tick                  : constant := 1.0 / 60.0;
-
-   --  Storage-related Declarations
-
-   type Address is private;
-   pragma Preelaborable_Initialization (Address);
-   Null_Address : constant Address;
-
-   Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
-
-   --  Address comparison
-
-   function "<"  (Left, Right : Address) return Boolean;
-   function "<=" (Left, Right : Address) return Boolean;
-   function ">"  (Left, Right : Address) return Boolean;
-   function ">=" (Left, Right : Address) return Boolean;
-   function "="  (Left, Right : Address) return Boolean;
-
-   pragma Import (Intrinsic, "<");
-   pragma Import (Intrinsic, "<=");
-   pragma Import (Intrinsic, ">");
-   pragma Import (Intrinsic, ">=");
-   pragma Import (Intrinsic, "=");
-
-   --  Other System-Dependent Declarations
-
-   type Bit_Order is (High_Order_First, Low_Order_First);
-   Default_Bit_Order : constant Bit_Order := High_Order_First;
-   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
-
-   --  Priority-related Declarations (RM D.1)
-
-   --  Ada priorities are mapped to VxWorks priorities using the following
-   --  transformation: 255 - Ada Priority
-
-   --  Ada priorities are used as follows:
-
-   --  256        is reserved for the VxWorks kernel
-   --  248 - 255  correspond to hardware interrupt levels 0 .. 7
-   --  247        is a catchall default "interrupt" priority for signals,
-   --             allowing higher priority than normal tasks, but lower than
-   --             hardware priority levels.  Protected Object ceilings can
-   --             override these values.
-   --  246        is used by the Interrupt_Manager task
-
-   Max_Priority           : constant Positive := 245;
-   Max_Interrupt_Priority : constant Positive := 255;
-
-   subtype Any_Priority       is Integer      range   0 .. 255;
-   subtype Priority           is Any_Priority range   0 .. 245;
-   subtype Interrupt_Priority is Any_Priority range 246 .. 255;
-
-   Default_Priority : constant Priority := 122;
-
-private
-
-   pragma Linker_Options ("--specs=vxworks-ppc-link.spec");
-   --  Setup proper set of -L's for this configuration
-
-   type Address is mod Memory_Size;
-   Null_Address : constant Address := 0;
-
-   --------------------------------------
-   -- System Implementation Parameters --
-   --------------------------------------
-
-   --  These parameters provide information about the target that is used
-   --  by the compiler. They are in the private part of System, where they
-   --  can be accessed using the special circuitry in the Targparm unit
-   --  whose source should be consulted for more detailed descriptions
-   --  of the individual switch values.
-
-   Backend_Divide_Checks     : constant Boolean := False;
-   Backend_Overflow_Checks   : constant Boolean := True;
-   Command_Line_Args         : constant Boolean := False;
-   Configurable_Run_Time     : constant Boolean := False;
-   Denorm                    : constant Boolean := True;
-   Duration_32_Bits          : constant Boolean := False;
-   Exit_Status_Supported     : constant Boolean := True;
-   Machine_Overflows         : constant Boolean := False;
-   Machine_Rounds            : constant Boolean := True;
-   Preallocated_Stacks       : constant Boolean := False;
-   Signed_Zeros              : constant Boolean := True;
-   Stack_Check_Default       : constant Boolean := False;
-   Stack_Check_Probes        : constant Boolean := False;
-   Stack_Check_Limits        : constant Boolean := True;
-   Support_Aggregates        : constant Boolean := True;
-   Support_Composite_Assign  : constant Boolean := True;
-   Support_Composite_Compare : constant Boolean := True;
-   Support_Long_Shifts       : constant Boolean := True;
-   Always_Compatible_Rep     : constant Boolean := False;
-   Suppress_Standard_Library : constant Boolean := False;
-   Use_Ada_Main_Program_Name : constant Boolean := True;
-   Frontend_Exceptions       : constant Boolean := True;
-   ZCX_By_Default            : constant Boolean := False;
-
-   Executable_Extension : constant String := ".out";
-
-end System;


diff --git a/gcc/ada/libgnat/system-vxworks-x86.ads /dev/null
deleted file mode 100644
--- a/gcc/ada/libgnat/system-vxworks-x86.ads
+++ /dev/null
@@ -1,164 +0,0 @@ 
-------------------------------------------------------------------------------
---                                                                          --
---                        GNAT RUN-TIME COMPONENTS                          --
---                                                                          --
---                               S Y S T E M                                --
---                                                                          --
---                                 S p e c                                  --
---                         (VxWorks 5 Version x86)                          --
---                                                                          --
---          Copyright (C) 1992-2021, Free Software Foundation, Inc.         --
---                                                                          --
--- This specification is derived from the Ada Reference Manual for use with --
--- GNAT. The copyright notice above, and the license provisions that follow --
--- apply solely to the  contents of the part following the private keyword. --
---                                                                          --
--- GNAT is free software;  you can  redistribute it  and/or modify it under --
--- terms of the  GNU General Public License as published  by the Free Soft- --
--- ware  Foundation;  either version 3,  or (at your option) any later ver- --
--- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
---                                                                          --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception,   --
--- version 3.1, as published by the Free Software Foundation.               --
---                                                                          --
--- You should have received a copy of the GNU General Public License and    --
--- a copy of the GCC Runtime Library Exception along with this program;     --
--- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
--- <http://www.gnu.org/licenses/>.                                          --
---                                                                          --
--- GNAT was originally developed  by the GNAT team at  New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc.      --
---                                                                          --
-------------------------------------------------------------------------------
-
-package System is
-   pragma Pure;
-   --  Note that we take advantage of the implementation permission to make
-   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
-   --  2005, this is Pure in any case (AI-362).
-
-   pragma No_Elaboration_Code_All;
-   --  Allow the use of that restriction in units that WITH this unit
-
-   type Name is (SYSTEM_NAME_GNAT);
-   System_Name : constant Name := SYSTEM_NAME_GNAT;
-
-   --  System-Dependent Named Numbers
-
-   Min_Int             : constant := -2 ** (Standard'Max_Integer_Size - 1);
-   Max_Int             : constant :=  2 ** (Standard'Max_Integer_Size - 1) - 1;
-
-   Max_Binary_Modulus    : constant := 2 ** Standard'Max_Integer_Size;
-   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
-
-   Max_Base_Digits       : constant := Long_Long_Float'Digits;
-   Max_Digits            : constant := Long_Long_Float'Digits;
-
-   Max_Mantissa          : constant := Standard'Max_Integer_Size - 1;
-   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
-
-   Tick                  : constant := 1.0 / 60.0;
-
-   --  Storage-related Declarations
-
-   type Address is private;
-   pragma Preelaborable_Initialization (Address);
-   Null_Address : constant Address;
-
-   Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
-
-   --  Address comparison
-
-   function "<"  (Left, Right : Address) return Boolean;
-   function "<=" (Left, Right : Address) return Boolean;
-   function ">"  (Left, Right : Address) return Boolean;
-   function ">=" (Left, Right : Address) return Boolean;
-   function "="  (Left, Right : Address) return Boolean;
-
-   pragma Import (Intrinsic, "<");
-   pragma Import (Intrinsic, "<=");
-   pragma Import (Intrinsic, ">");
-   pragma Import (Intrinsic, ">=");
-   pragma Import (Intrinsic, "=");
-
-   --  Other System-Dependent Declarations
-
-   type Bit_Order is (High_Order_First, Low_Order_First);
-   Default_Bit_Order : constant Bit_Order := Low_Order_First;
-   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
-
-   --  Priority-related Declarations (RM D.1)
-
-   --  Ada priorities are mapped to VxWorks priorities using the following
-   --  transformation: 255 - Ada Priority
-
-   --  Ada priorities are used as follows:
-
-   --  256        is reserved for the VxWorks kernel
-   --  248 - 255  correspond to hardware interrupt levels 0 .. 7
-   --  247        is a catchall default "interrupt" priority for signals,
-   --             allowing higher priority than normal tasks, but lower than
-   --             hardware priority levels.  Protected Object ceilings can
-   --             override these values.
-   --  246        is used by the Interrupt_Manager task
-
-   Max_Priority           : constant Positive := 245;
-   Max_Interrupt_Priority : constant Positive := 255;
-
-   subtype Any_Priority       is Integer      range   0 .. 255;
-   subtype Priority           is Any_Priority range   0 .. 245;
-   subtype Interrupt_Priority is Any_Priority range 246 .. 255;
-
-   Default_Priority : constant Priority := 122;
-
-private
-
-   pragma Linker_Options ("--specs=vxworks-x86-link.spec");
-   --  Setup proper set of -L's for this configuration
-
-   type Address is mod Memory_Size;
-   Null_Address : constant Address := 0;
-
-   --------------------------------------
-   -- System Implementation Parameters --
-   --------------------------------------
-
-   --  These parameters provide information about the target that is used
-   --  by the compiler. They are in the private part of System, where they
-   --  can be accessed using the special circuitry in the Targparm unit
-   --  whose source should be consulted for more detailed descriptions
-   --  of the individual switch values.
-
-   Backend_Divide_Checks     : constant Boolean := False;
-   Backend_Overflow_Checks   : constant Boolean := True;
-   Command_Line_Args         : constant Boolean := False;
-   Configurable_Run_Time     : constant Boolean := False;
-   Denorm                    : constant Boolean := True;
-   Duration_32_Bits          : constant Boolean := False;
-   Exit_Status_Supported     : constant Boolean := True;
-   Machine_Overflows         : constant Boolean := False;
-   Machine_Rounds            : constant Boolean := True;
-   Preallocated_Stacks       : constant Boolean := False;
-   Signed_Zeros              : constant Boolean := True;
-   Stack_Check_Default       : constant Boolean := False;
-   Stack_Check_Probes        : constant Boolean := False;
-   Stack_Check_Limits        : constant Boolean := True;
-   Support_Aggregates        : constant Boolean := True;
-   Support_Atomic_Primitives : constant Boolean := True;
-   Support_Composite_Assign  : constant Boolean := True;
-   Support_Composite_Compare : constant Boolean := True;
-   Support_Long_Shifts       : constant Boolean := True;
-   Always_Compatible_Rep     : constant Boolean := False;
-   Suppress_Standard_Library : constant Boolean := False;
-   Use_Ada_Main_Program_Name : constant Boolean := True;
-   Frontend_Exceptions       : constant Boolean := True;
-   ZCX_By_Default            : constant Boolean := False;
-
-   Executable_Extension : constant String := ".out";
-
-end System;