Index: config.gcc
===================================================================
--- config.gcc	(revision 187660)
+++ config.gcc	(working copy)
@@ -1470,6 +1470,8 @@
 	extra_objs="winnt.o winnt-stubs.o"
 	c_target_objs="${c_target_objs} msformat-c.o"
 	cxx_target_objs="${cxx_target_objs} winnt-cxx.o msformat-c.o"
+	gas=yes
+	gnu_ld=yes
 	default_use_cxa_atexit=yes
 	use_gcc_stdint=wrap
 	case ${enable_threads} in
Index: configure.ac
===================================================================
--- configure.ac	(revision 187660)
+++ configure.ac	(working copy)
@@ -213,9 +213,6 @@
 	[Define to enable the use of a default linker.])
 fi
 
-gnu_ld=`if test x"$gnu_ld_flag" = x"yes"; then echo 1; else echo 0; fi`
-AC_DEFINE_UNQUOTED(HAVE_GNU_LD, $gnu_ld, [Define if using GNU ld.])
-
 AC_MSG_CHECKING([whether a default linker was specified])
 if test x"${DEFAULT_LINKER+set}" = x"set"; then
   if test x"$gnu_ld_flag" = x"no"; then
@@ -256,9 +253,6 @@
 	[Define to enable the use of a default assembler.])
 fi
 
-gnu_as=`if test x"$gas_flag" = x"yes"; then echo 1; else echo 0; fi`
-AC_DEFINE_UNQUOTED(HAVE_GNU_AS, $gnu_as, [Define if using GNU as.])
-
 AC_MSG_CHECKING([whether a default assembler was specified])
 if test x"${DEFAULT_ASSEMBLER+set}" = x"set"; then
   if test x"$gas_flag" = x"no"; then
@@ -1328,6 +1322,12 @@
 efficiently supported by the host hardware.])
 fi
 
+gnu_ld_bool=`if test x"$gnu_ld" = x"yes"; then echo 1; else echo 0; fi`
+AC_DEFINE_UNQUOTED(HAVE_GNU_LD, $gnu_ld_bool, [Define to 1 if using GNU ld.])
+
+gnu_as_bool=`if test x"$gas" = x"yes"; then echo 1; else echo 0; fi`
+AC_DEFINE_UNQUOTED(HAVE_GNU_AS, $gnu_as_bool, [Define to 1 if using GNU as.])
+
 count=a
 for f in $host_xm_file; do
 	count=${count}x
Index: ada/mlib-utl.adb
===================================================================
--- ada/mlib-utl.adb	(revision 187660)
+++ ada/mlib-utl.adb	(working copy)
@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---                     Copyright (C) 2002-2011, AdaCore                     --
+--                     Copyright (C) 2002-2012, AdaCore                     --
 --                                                                          --
 -- 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- --
@@ -31,8 +31,6 @@
 
 with Interfaces.C.Strings; use Interfaces.C.Strings;
 
-with System;
-
 package body MLib.Utl is
 
    Adalib_Path : String_Access := null;
@@ -353,16 +351,13 @@
       --  Pointer to a string representing the linker option which specifies
       --  the response file.
 
-      Using_GNU_Linker : Boolean;
-      for Using_GNU_Linker'Size use Character'Size;
-      pragma Import (C, Using_GNU_Linker, "__gnat_using_gnu_linker");
-      --  Predicate indicating whether this target uses the GNU linker. In
-      --  this case we must output a GNU linker compatible response file.
+      Object_File_Option : constant String := Value (Object_File_Option_Ptr);
+      --  The linker option which specifies the response file as a string
 
-      Opening : aliased constant String := """";
-      Closing : aliased constant String := '"' & ASCII.LF;
-      --  Needed to quote object paths in object list files when GNU linker
-      --  is used.
+      Using_GNU_response_file : constant Boolean :=
+        Object_File_Option'Length > 0
+          and then Object_File_Option (Object_File_Option'Last) = '@';
+      --  Whether a GNU response file is used
 
       Tname    : String_Access;
       Tname_FD : File_Descriptor := Invalid_FD;
@@ -390,7 +385,7 @@
 
       Position : Object_Position;
 
-      procedure Write_RF (A : System.Address; N : Integer);
+      procedure Write_RF (S : String);
       --  Write a string to the response file and check if it was successful.
       --  Fail the program if it was not successful (disk full).
 
@@ -398,12 +393,38 @@
       -- Write_RF --
       --------------
 
-      procedure Write_RF (A : System.Address; N : Integer) is
-         Status : Integer;
+      procedure Write_RF (S : String) is
+         Success : Boolean := True;
       begin
-         Status := Write (Tname_FD, A, N);
+         --  If a GNU response file is used, space and backslash need to be
+         --  escaped because they are interpreted as a string separator and
+         --  an escape character respectively by the underlying mechanism.
+         --  On the other hand, quote and double-quote are not escaped since
+         --  they are interpreted as string delimiters on both sides.
 
-         if Status /= N then
+         if Using_GNU_response_file then
+            for I in S'Range loop
+               if S (I) = ' ' or else S (I) = '\' then
+                  if Write (Tname_FD, ASCII.BACK_SLASH'Address, 1) /= 1 then
+                     Success := False;
+                  end if;
+               end if;
+
+               if Write (Tname_FD, S (I)'Address, 1) /= 1 then
+                  Success := False;
+               end if;
+            end loop;
+         else
+            if Write (Tname_FD, S'Address, S'Length) /= S'Length then
+               Success := False;
+            end if;
+         end if;
+
+         if Write (Tname_FD, ASCII.LF'Address, 1) /= 1 then
+            Success := False;
+         end if;
+
+         if not Success then
             Fail ("cannot generate response file to link library: disk full");
          end if;
       end Write_RF;
@@ -529,53 +550,10 @@
 
          Create_Temp_File (Tname_FD, Tname);
 
-         --  If target is using the GNU linker we must add a special header
-         --  and footer in the response file.
-
-         --  The syntax is : INPUT (object1.o object2.o ... )
-
-         --  Because the GNU linker does not like name with characters such
-         --  as '!', we must put the object paths between double quotes.
-
-         if Using_GNU_Linker then
-            declare
-               GNU_Header : aliased constant String := "INPUT (";
-
-            begin
-               Write_RF (GNU_Header'Address, GNU_Header'Length);
-            end;
-         end if;
-
          for J in Objects'Range loop
-            --  Opening quote for GNU linker
-
-            if Using_GNU_Linker then
-               Write_RF (Opening'Address, 1);
-            end if;
-
-            Write_RF (Objects (J).all'Address, Objects (J).all'Length);
-
-            --  Closing quote for GNU linker
-
-            if Using_GNU_Linker then
-               Write_RF (Closing'Address, 2);
-
-            else
-               Write_RF (ASCII.LF'Address, 1);
-            end if;
+            Write_RF (Objects (J).all);
          end loop;
 
-         --  Handle GNU linker response file footer
-
-         if Using_GNU_Linker then
-            declare
-               GNU_Footer : aliased constant String := ")";
-
-            begin
-               Write_RF (GNU_Footer'Address, GNU_Footer'Length);
-            end;
-         end if;
-
          Close (Tname_FD, Closing_Status);
 
          if not Closing_Status then
@@ -583,8 +561,7 @@
          end if;
 
          A := A + 1;
-         Arguments (A) :=
-           new String'(Value (Object_File_Option_Ptr) & Tname.all);
+         Arguments (A) := new String'(Object_File_Option & Tname.all);
 
       else
          A := A + Objects'Length;
@@ -596,17 +573,15 @@
 
       Spawn (Driver.all, Arguments (1 .. A), Success);
 
-      if Tname /= null then
-         Delete_File (Tname.all, Closing_Status);
+      if Success then
+         --  Delete the temporary file used in conjunction with linking
+         --  if one was created.
 
-         if not Closing_Status then
-            Write_Str ("warning: could not delete response file """);
-            Write_Str (Tname.all);
-            Write_Line (""" to link library");
+         if Tname_FD /= Invalid_FD then
+            Delete_File (Tname.all);
          end if;
-      end if;
 
-      if not Success then
+      else
          if Driver_Name = No_Name then
             Fail (Gcc_Name.all & " execution error");
          else
Index: ada/gnatlink.adb
===================================================================
--- ada/gnatlink.adb	(revision 187660)
+++ ada/gnatlink.adb	(working copy)
@@ -178,6 +178,19 @@
    --  Predicate indicating whether the linker has an option whereby the
    --  names of object files can be passed to the linker in a file.
 
+   Object_File_Option_Ptr : Interfaces.C.Strings.chars_ptr;
+   pragma Import (C, Object_File_Option_Ptr, "__gnat_object_file_option");
+   --  Pointer to a string representing the linker option which specifies
+   --  the response file.
+
+   Object_File_Option : constant String := Value (Object_File_Option_Ptr);
+   --  The linker option which specifies the response file as a string
+
+   Using_GNU_response_file : constant Boolean :=
+     Object_File_Option'Length > 0
+       and then Object_File_Option (Object_File_Option'Last) = '@';
+   --  Whether a GNU response file is used
+
    Object_List_File_Required : Boolean := False;
    --  Set to True to force generation of a response file
 
@@ -760,28 +773,12 @@
       --  Pointer to string specifying the default extension for
       --  object libraries, e.g. Unix uses ".a", VMS uses ".olb".
 
-      Object_File_Option_Ptr : Interfaces.C.Strings.chars_ptr;
-      pragma Import (C, Object_File_Option_Ptr, "__gnat_object_file_option");
-      --  Pointer to a string representing the linker option which specifies
-      --  the response file.
-
-      Using_GNU_Linker : Boolean;
-      for Using_GNU_Linker'Size use Character'Size;
-      pragma Import (C, Using_GNU_Linker, "__gnat_using_gnu_linker");
-      --  Predicate indicating whether this target uses the GNU linker. In
-      --  this case we must output a GNU linker compatible response file.
-
       Separate_Run_Path_Options : Boolean;
       for Separate_Run_Path_Options'Size use Character'Size;
       pragma Import
         (C, Separate_Run_Path_Options, "__gnat_separate_run_path_options");
       --  Whether separate rpath options should be emitted for each directory
 
-      Opening : aliased constant String := """";
-      Closing : aliased constant String := '"' & ASCII.LF;
-      --  Needed to quote object paths in object list files when GNU linker
-      --  is used.
-
       procedure Get_Next_Line;
       --  Read the next line from the binder file without the line
       --  terminator.
@@ -804,6 +801,10 @@
       --  after Store_File_Context. The binder file context will be restored
       --  with the data stored by the last Store_File_Context call.
 
+      procedure Write_RF (S : String);
+      --  Write a string to the response file and check if it was successful.
+      --  Fail the program if it was not successful (disk full).
+
       -------------------
       -- Get_Next_Line --
       -------------------
@@ -897,6 +898,46 @@
          end if;
       end Store_File_Context;
 
+      --------------
+      -- Write_RF --
+      --------------
+
+      procedure Write_RF (S : String) is
+         Success : Boolean := True;
+      begin
+         --  If a GNU response file is used, space and backslash need to be
+         --  escaped because they are interpreted as a string separator and
+         --  an escape character respectively by the underlying mechanism.
+         --  On the other hand, quote and double-quote are not escaped since
+         --  they are interpreted as string delimiters on both sides.
+
+         if Using_GNU_response_file then
+            for I in S'Range loop
+               if S (I) = ' ' or else S (I) = '\' then
+                  if Write (Tname_FD, ASCII.BACK_SLASH'Address, 1) /= 1 then
+                     Success := False;
+                  end if;
+               end if;
+
+               if Write (Tname_FD, S (I)'Address, 1) /= 1 then
+                  Success := False;
+               end if;
+            end loop;
+         else
+            if Write (Tname_FD, S'Address, S'Length) /= S'Length then
+               Success := False;
+            end if;
+         end if;
+
+         if Write (Tname_FD, ASCII.LF'Address, 1) /= 1 then
+            Success := False;
+         end if;
+
+         if not Success then
+            Exit_With_Error ("Error generating response file: disk full");
+         end if;
+      end Write_RF;
+
    --  Start of processing for Process_Binder_File
 
    begin
@@ -985,61 +1026,14 @@
          --  ??? Status of Write and Close operations should be checked, and
          --  failure should occur if a status is wrong.
 
-         --  If target is using the GNU linker we must add a special header
-         --  and footer in the response file.
-
-         --  The syntax is : INPUT (object1.o object2.o ... )
-
-         --  Because the GNU linker does not like name with characters such
-         --  as '!', we must put the object paths between double quotes.
-
-         if Using_GNU_Linker then
-            declare
-               GNU_Header : aliased constant String := "INPUT (";
-
-            begin
-               Status := Write (Tname_FD, GNU_Header'Address,
-                 GNU_Header'Length);
-            end;
-         end if;
-
          for J in Objs_Begin .. Objs_End loop
+            Write_RF (Linker_Objects.Table (J).all);
 
-            --  Opening quote for GNU linker
-
-            if Using_GNU_Linker then
-               Status := Write (Tname_FD, Opening'Address, 1);
-            end if;
-
-            Status := Write (Tname_FD, Linker_Objects.Table (J).all'Address,
-                             Linker_Objects.Table (J).all'Length);
-
-            --  Closing quote for GNU linker
-
-            if Using_GNU_Linker then
-               Status := Write (Tname_FD, Closing'Address, 2);
-
-            else
-               Status := Write (Tname_FD, ASCII.LF'Address, 1);
-            end if;
-
             Response_File_Objects.Increment_Last;
             Response_File_Objects.Table (Response_File_Objects.Last) :=
               Linker_Objects.Table (J);
          end loop;
 
-         --  Handle GNU linker response file footer
-
-         if Using_GNU_Linker then
-            declare
-               GNU_Footer : aliased constant String := ")";
-
-            begin
-               Status := Write (Tname_FD, GNU_Footer'Address,
-                 GNU_Footer'Length);
-            end;
-         end if;
-
          Close (Tname_FD, Closing_Status);
 
          --  Add the special objects list file option together with the name
@@ -1047,7 +1041,7 @@
          --  file table.
 
          Linker_Objects.Table (Objs_Begin) :=
-           new String'(Value (Object_File_Option_Ptr) &
+           new String'(Object_File_Option &
                        Tname (Tname'First .. Tname'Last - 1));
 
          --  The slots containing these object file names are then removed
@@ -2213,14 +2207,15 @@
 
             System.OS_Lib.Spawn (Linker_Path.all, Args, Success);
 
-            --  Delete the temporary file used in conjunction with linking if
-            --  one was created. See Process_Bind_File for details.
+            if Success then
+               --  Delete the temporary file used in conjunction with linking
+               --  if one was created. See Process_Bind_File for details.
 
-            if Tname_FD /= Invalid_FD then
-               Delete (Tname);
-            end if;
+               if Tname_FD /= Invalid_FD then
+                  Delete (Tname);
+               end if;
 
-            if not Success then
+            else
                Error_Msg ("error when calling " & Linker_Path.all);
                Exit_Program (E_Fatal);
             end if;
Index: ada/link.c
===================================================================
--- ada/link.c	(revision 187660)
+++ ada/link.c	(working copy)
@@ -72,38 +72,22 @@
 /*  shared_libgcc_default gives the system dependent link method that       */
 /*  be used by default for linking libgcc (shared or static)                */
 
-/*  using_gnu_linker is set to 1 when the GNU linker is used under this     */
-/*  target.                                                                 */
-
 /*  separate_run_path_options is set to 1 when separate "rpath" arguments   */
 /*  must be passed to the linker for each directory in the rpath.           */
 
 /*  default_libgcc_subdir is the subdirectory name (from the installation   */
 /*  root) where we may find a shared libgcc to use by default.              */
 
-/*  RESPONSE FILE & GNU LINKER                                              */
-/*  --------------------------                                              */
-/*  objlist_file_supported and using_gnu_link used together tell gnatlink   */
-/*  to generate a GNU style response file. Note that object_file_option     */
-/*  must be set to "" in this case, since no option is required for a       */
-/*  response file to be passed to GNU ld. With a GNU linker we use the      */
-/*  linker script to implement the response file feature. Any file passed   */
-/*  in the GNU ld command line with an unknown extension is supposed to be  */
-/*  a linker script. Each linker script augment the current configuration.  */
-/*  The format of such response file is as follow :                         */
-/*  INPUT (obj1.p obj2.o ...)                                               */
-
 #define SHARED 'H'
 #define STATIC 'T'
 
 #if defined (__WIN32)
-const char *__gnat_object_file_option = "";
+const char *__gnat_object_file_option = "-Wl,@";
 const char *__gnat_run_path_option = "";
 int __gnat_link_max = 30000;
 unsigned char __gnat_objlist_file_supported = 1;
 char __gnat_shared_libgnat_default = STATIC;
 char __gnat_shared_libgcc_default = STATIC;
-unsigned char __gnat_using_gnu_linker = 1;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
@@ -115,19 +99,17 @@
 unsigned char __gnat_objlist_file_supported = 1;
 char __gnat_shared_libgnat_default = STATIC;
 char __gnat_shared_libgcc_default = STATIC;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
 
 #elif defined (__FreeBSD__)
-const char *__gnat_object_file_option = "";
+const char *__gnat_object_file_option = "-Wl,@";
 const char *__gnat_run_path_option = "-Wl,-rpath,";
 char __gnat_shared_libgnat_default = STATIC;
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 8192;
 unsigned char __gnat_objlist_file_supported = 1;
-unsigned char __gnat_using_gnu_linker = 1;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
@@ -139,19 +121,17 @@
 char __gnat_shared_libgcc_default = SHARED;
 int __gnat_link_max = 262144;
 unsigned char __gnat_objlist_file_supported = 1;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 1;
 const char *__gnat_default_libgcc_subdir = "lib";
 
 #elif defined (linux) || defined(__GLIBC__)
-const char *__gnat_object_file_option = "";
+const char *__gnat_object_file_option = "-Wl,@";
 const char *__gnat_run_path_option = "-Wl,-rpath,";
 char __gnat_shared_libgnat_default = STATIC;
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 8192;
 unsigned char __gnat_objlist_file_supported = 1;
-unsigned char __gnat_using_gnu_linker = 1;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 #if defined (__x86_64)
@@ -174,7 +154,6 @@
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 15000;
 const unsigned char __gnat_objlist_file_supported = 1;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
@@ -183,13 +162,12 @@
 /*  These are the settings for all systems that use gnu ld. GNU style response
     file is supported, the shared library default is STATIC.  */
 
-const char *__gnat_object_file_option = "";
+const char *__gnat_object_file_option = "-Wl,@";
 const char *__gnat_run_path_option = "";
 char __gnat_shared_libgnat_default = STATIC;
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 8192;
 unsigned char __gnat_objlist_file_supported = 1;
-unsigned char __gnat_using_gnu_linker = 1;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
@@ -201,7 +179,6 @@
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 2147483647;
 unsigned char __gnat_objlist_file_supported = 0;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".olb";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
@@ -213,7 +190,6 @@
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 2147483647;
 unsigned char __gnat_objlist_file_supported = 0;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 #if defined (__sparc_v9__) || defined (__sparcv9)
@@ -231,7 +207,6 @@
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 2147483647;
 unsigned char __gnat_objlist_file_supported = 0;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
@@ -246,7 +221,6 @@
 char __gnat_shared_libgcc_default = STATIC;
 int __gnat_link_max = 2147483647;
 unsigned char __gnat_objlist_file_supported = 0;
-unsigned char __gnat_using_gnu_linker = 0;
 const char *__gnat_object_library_extension = ".a";
 unsigned char __gnat_separate_run_path_options = 0;
 const char *__gnat_default_libgcc_subdir = "lib";
Index: testsuite/gnat.dg/lto12.adb
===================================================================
--- testsuite/gnat.dg/lto13.adb	(revision 0)
+++ testsuite/gnat.dg/lto13.adb	(revision 0)
@@ -0,0 +1,7 @@
+-- { dg-do link }
+-- { dg-options "-largs -f -margs -flto" { target lto } }
+
+procedure Lto13 is
+begin
+  null;
+end;
