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/usr/share/gprconfig/linker.xml is in gprbuild 2011-4.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" ?>
<gprconfig>

  <!--  This configuration shows how to link a multi language
        application with GNAT and either GCC or toolchains
        derived from gcc -->


  <!--  Archiver.  -->
  <configuration>
    <targets>
      <target name="^powerpc-elf$" />
    </targets>
    <config>
   for Archive_Builder  use ("powerpc-elf-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("powerpc-elf-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^powerpc-elf-lynxos$" />
    </targets>
    <config>
   for Archive_Builder  use ("ar", "crs");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^powerpc-eabispe$" />
    </targets>
    <config>
   for Archive_Builder  use ("powerpc-eabispe-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("powerpc-eabispe-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^i686-elinos-linux$" />
    </targets>
    <config>
   for Archive_Builder  use ("i686-elinos-linux-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("i686-elinos-linux-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^i686-pc-mingw32$" />
    </targets>
    <hosts negate="true">
      <host name="^i686-pc-mingw32$" />
    </hosts>
    <config>
   for Archive_Builder  use ("i686-pc-mingw32-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("i686-pc-mingw32-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^i686-pc-mingw32$" />
    </targets>
    <hosts>
      <host name="^i686-pc-mingw32$" />
    </hosts>
    <config>
   for Archive_Builder  use ("ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^x86_64-pc-mingw32$" />
    </targets>
    <hosts negate="true">
      <host name="^x86_64-pc-mingw32$" />
    </hosts>
    <config>
   for Archive_Builder  use ("x86_64-pc-mingw32-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("x86_64-pc-mingw32-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^x86_64-pc-mingw32$" />
    </targets>
    <hosts>
      <host name="^x86_64-pc-mingw32$" />
    </hosts>
    <config>
   for Archive_Builder  use ("ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^powerpc-elinos-linux$" />
    </targets>
    <config>
   for Archive_Builder  use ("powerpc-elinos-linux-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("powerpc-elinos-linux-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^erc32-elf$" />
    </targets>
    <config>
   for Archive_Builder  use ("erc32-elf-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("erc32-elf-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^leon-elf$" />
    </targets>
    <config>
   for Archive_Builder  use ("leon-elf-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("leon-elf-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^leon3-elf$" />
    </targets>
    <config>
   for Archive_Builder  use ("leon3-elf-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("leon3-elf-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^avr$" />
    </targets>
    <config>
   for Archive_Builder  use ("avr-ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("avr-ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <!-- Do not run ranlib on AIX -->
  <configuration>
    <targets>
      <target name="^.*aix.*$" />
    </targets>
    <config>
   for Archive_Builder  use ("ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Suffix   use ".a";

   package Linker is
      for Max_Command_Line_Length use "15000";
      for Response_File_Format    use "object_list";
      for Response_File_Switches  use ("-Wl,-f,");
      for Map_File_Option         use "-Wl,-b,map:";
   end Linker;
    </config>
  </configuration>

  <!-- Do not run ranlib on IA64 HPUX -->
  <configuration>
    <targets>
      <target name=".*ia64.*hpux.*" />
    </targets>
    <config>
   for Archive_Builder  use ("ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <configuration>
    <targets negate="true">
      <target name="^.*-wrs-vxworks.*$" />
      <target name="^powerpc-elf$"/>
      <target name="^powerpc-elf-lynxos$" />
      <target name="^powerpc-eabispe$"/>
      <target name="^avr$"/>
      <target name="^erc32-elf$"/>
      <target name="^leon-elf$"/>
      <target name="^leon3-elf$"/>
      <target name="^.*aix.*$" />
      <target name="^.*ia64.*hpux.*$" />
      <target name="^.*pc-mingw32$" />
    </targets>
    <config>
   for Archive_Builder  use ("ar", "cr");
   for Archive_Builder_Append_Option use ("q");
   for Archive_Indexer  use ("ranlib");
   for Archive_Suffix   use ".a";
    </config>
  </configuration>

  <!--  Systems with no support for shared libraries, but with static libraries -->
  <configuration>
    <targets>
       <target name="^.*aix.*$" />
       <target name="^.*lynxos.*$" />
       <target name="^powerpc-elf$" />
       <target name="^powerpc-eabispe$" />
       <target name="^erc32-elf$" />
       <target name="^leon-elf$" />
       <target name="^leon3-elf$" />
       <target name="^.*wrs-vxworks.*$" />
       <target name="^avr$" />
    </targets>
    <config>
   for Library_Support  use "static_only";
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
    </config>
  </configuration>

  <!-- GNAAMP -->
  <configuration>
    <targets>
       <target name="aamp" />
    </targets>
    <config>
   for Library_Support use "none";

   package Linker is
      for Driver use "aa_link";
   end Linker;
    </config>
  </configuration>

  <!-- DOTNET -->
  <configuration>
    <targets>
       <target name="dotnet" />
    </targets>
    <config>
   for Library_Support use "none";

   package Linker is
      for Driver use "dotnet-ld";
   end Linker;
    </config>
  </configuration>

  <!--  Darwin -->
  <configuration>
    <targets>
       <target name="^.*darwin.*$" />
    </targets>
    <config>
   for Library_Builder use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support use "full";
   for Shared_Library_Prefix use "lib";
   for Symbolic_Link_Supported use "true";
   for Library_Major_Minor_Id_Supported use "true";

   for Run_Path_Option  use ();
   for Separate_Run_Path_Options use "true";
   for Run_Path_Origin use "@executable_path";
   for Library_Install_Name_Option use "-Wl,-install_name,@rpath";

   for Shared_Library_Suffix use ".dylib";
   for Library_Auto_Init_Supported use "true";
   for Archive_Indexer use project'Archive_Indexer &amp; ("-c");
   for Shared_Library_Minimum_Switches use
         ("-dynamiclib", "-Wl,-flat_namespace", "-shared-libgcc");

   package Linker is
      for Map_File_Option         use "-Wl,-map,";
   end Linker;
    </config>
  </configuration>

  <!--  HPUX -->
  <configuration>
    <targets>
       <target name="^.*hpux.*$" />
    </targets>
    <config>
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support  use "full";
   for Shared_Library_Prefix use "lib";
   for Symbolic_Link_Supported use "true";
   for Library_Major_Minor_Id_Supported use "true";
   for Shared_Library_Minimum_Switches use ("-shared", "-fPIC");
   for Library_Version_Switches use ("-Wl,-soname,");

   for Shared_Library_Suffix use ".sl";
   for Library_Auto_Init_Supported use "true";
   for Run_Path_Option  use ("-Wl,+b,");
   for Library_Partial_Linker use ("gcc", "-nostdlib", "-Wl,-r", "-o");

   package Linker is
      for Max_Command_Line_Length use "5000";
      for Response_File_Format    use "object_list";
      for Response_File_Switches  use ("-Wl,-c,");
   end Linker;
    </config>
  </configuration>

  <!-- On IA64 HPUX, the shared library suffix is .so -->
   <configuration>
    <targets>
       <target name=".*ia64.*hpux.*" />
    </targets>
    <config>
   for Shared_Library_Suffix use ".so";
    </config>
  </configuration>

  <!-- linux, freebsd, Hurd and Irix-->
  <configuration>
    <targets>
       <target name="^.*linux.*$" />
       <target name="^.*freebsd.*$" />
       <target name="^.*irix.*$" />
       <target name="^.*gnu.*$" />
    </targets>
    <config>
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support  use "full";
   for Shared_Library_Prefix use "lib";
   for Symbolic_Link_Supported use "true";
   for Library_Major_Minor_Id_Supported use "true";
   for Shared_Library_Minimum_Switches use ("-shared");
   for Library_Version_Switches use ("-Wl,-soname,");

   for Shared_Library_Suffix use ".so";
   for Library_Auto_Init_Supported use "true";
    </config>
  </configuration>

  <!-- linux -->
  <configuration>
    <targets>
       <target name="^.*linux.*$" />
    </targets>
    <config>
   for Library_Partial_Linker use ("${PATH(ada)}${PREFIX(ada)}gcc", "-nostdlib", "-Wl,-r", "-o");
   for Run_Path_Option  use ("-Wl,-z,origin,-rpath,");
   for Run_Path_Origin use "$$ORIGIN";

   package Linker is
      for Map_File_Option         use "-Wl,-Map,";
   end Linker;
    </config>
  </configuration>

  <!-- freebsd -->
  <configuration>
    <targets>
       <target name="^.*freebsd.*$" />
    </targets>
    <config>
   for Run_Path_Option  use ("-Wl,-z,origin,-rpath,");
   for Run_Path_Origin use "$$ORIGIN";
    </config>
  </configuration>

  <!-- irix -->
  <configuration>
    <targets>
       <target name="^.*irix.*$" />
    </targets>
    <config>
   for Run_Path_Option  use ("-Wl,-rpath,");

   package Linker is
      for Max_Command_Line_Length use "5000";
      for Response_File_Format    use "object_list";
      for Response_File_Switches  use ("-Wl,-objectlist,");
   end Linker;
    </config>
  </configuration>

  <!--  Solaris -->
  <configuration>
    <targets>
       <target name="^.*sunos.*$" />
       <target name="^.*solaris.*$"/>
    </targets>
    <config>
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support  use "full";
   for Shared_Library_Prefix use "lib";
   for Symbolic_Link_Supported use "true";
   for Library_Major_Minor_Id_Supported use "true";
   for Shared_Library_Minimum_Switches use ("-shared");

   for Library_Version_Switches use ("-Wl,-h,");

   for Shared_Library_Suffix use ".so";
   for Library_Auto_Init_Supported use "true";
   for Run_Path_Option  use ("-Wl,-z,origin,-R,");
   for Run_Path_Origin use "$$ORIGIN";
   for Library_Partial_Linker use ("gcc", "-nostdlib", "-Wl,-r", "-o");
    </config>
  </configuration>

  <!--  Windows -->
  <configuration>
    <targets>
      <target name="^.*mingw.*$" />
    </targets>
    <config>
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support  use "full";
   for Shared_Library_Prefix use "lib";
   for Symbolic_Link_Supported use "false";
   for Library_Major_Minor_Id_Supported use "false";
   for Shared_Library_Minimum_Switches use ("-shared", "-shared-libgcc");
   for Library_Version_Switches use ("-Wl,-soname,");
   for Shared_Library_Suffix use ".dll";
   for Library_Auto_Init_Supported use "true";
   for Library_Partial_Linker use ("gcc", "-nostdlib", "-Wl,-r", "-o");

   package Linker is
      for Map_File_Option         use "-Wl,-Map,";
   end Linker;
    </config>
  </configuration>

  <!-- Tru64-->
  <configuration>
    <targets>
       <target name="^.*osf.*$" />
    </targets>
    <config>
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support  use "full";
   for Shared_Library_Prefix use "lib";
   for Symbolic_Link_Supported use "true";
   for Library_Major_Minor_Id_Supported use "true";
   for Shared_Library_Minimum_Switches use
      ("-shared", "-Wl,-expect_unresolved,*");
   for Library_Version_Switches use ("-Wl,-soname,");

   for Shared_Library_Suffix use ".so";
   for Library_Auto_Init_Supported use "true";
   for Run_Path_Option  use ("-Wl,-rpath,");

   package Linker is
      for Max_Command_Line_Length use "10000";
      for Response_File_Format    use "object_list";
      for Response_File_Switches  use ("-Wl,-input,");
   end Linker;
    </config>
  </configuration>

  <!--  VMS -->
  <configuration>
    <targets>
      <target name="^.*vms.*$" />
    </targets>
    <compilers><compiler name="GNAT" /></compilers>
    <config>
   for Library_Builder  use "${GPRCONFIG_PREFIX}lib/gprlib";
   for Library_Support  use "full";
   for Shared_Library_Prefix use "lib";
   for Shared_Library_Suffix use ".exe";
   for Symbolic_Link_Supported use "false";
   for Library_Major_Minor_Id_Supported use "false";
   for Shared_Library_Minimum_Switches use ("-shared", "-shared-libgcc");
   for Library_Auto_Init_Supported use "true";
    </config>
  </configuration>

  <!--  Cygming -->
  <configuration>
    <compilers><compiler name="GCC-CYGMING"/></compilers>
    <config>
   package Linker is
       for Required_Switches use ("-mno-cygwin");
   end Linker;
    </config>
  </configuration>

  <!--  use C++, Fortran, Ada or C driver to link in this order      -->

  <configuration>
    <compilers>
       <compiler language="C++" />
    </compilers>
    <config>
   package Linker is
      for Driver use Compiler'Driver ("C++");
   end Linker;
    </config>
  </configuration>

  <configuration>
    <targets>
      <target name="^.*linux.*$" />
      <target name="^.*sunos.*$" />
      <target name="^.*solaris.*$" />
      <target name="^.*mingw.*$" />
    </targets>
    <compilers>
       <compiler language="C++" />
    </compilers>
    <config>
     package Linker is
        for Required_Switches use Linker'Required_Switches &amp; ("-shared-libgcc");
     end Linker;
    </config>
  </configuration>

  <configuration>
    <compilers negate="true">
       <compiler language="C++" />
    </compilers>
    <compilers>
       <compiler language="Fortran" />
    </compilers>
    <config>
   package Linker is
      for Driver use Compiler'Driver ("Fortran");
   end Linker;
    </config>
  </configuration>

  <configuration>
    <targets negate="true">
       <target name="aamp" />
       <target name="dotnet" />
    </targets>
    <compilers negate="true">
       <compiler language="C++" />
       <compiler language="Fortran" />
    </compilers>
    <compilers>
       <compiler language="Ada" /></compilers>
    <config>
   package Linker is
      for Driver use Compiler'Driver ("Ada");
   end Linker;
    </config>
  </configuration>

  <!--  Define the right response file mechanism for linking
        when possible use both the GCC @response file (available starting with
        GNAT Pro 6) and the GNU linker mechanism. The latter can be used with
        all cross since they rely and on GNU ld and some of the major natives.
        Max_Command_Line could be made different for different hosts but we
        use the smallest value of all the hosts instead for uniformity.
  -->

   <configuration>
     <targets>
       <target name="^.*-wrs-vxworks.*$" />
       <target name="^.*-elf-lynx.*$" />
       <target name="^powerpc-elf$" />
       <target name="^powerpc-eabispe$" />
       <target name="^erc32-elf$" />
       <target name="^leon-elf$" />
       <target name="^leon3-elf$" />
       <target name="^arm-elf$" />
       <target name="^avr$" />
       <target name="^.*wrs-vxworks.*$" />
       <target name="^.*-elinos-linux$" />
       <target name="^.*mingw.*$" />
       <target name="^.*linux.*$" />
       <target name="^.*freebsd.*$" />
     </targets>
    <compilers negate="true">
       <compiler language="C++" />
       <compiler language="Fortran" />
    </compilers>
    <compilers>
       <compiler language="Ada" />
    </compilers>
    <compilers negate="true">
      <compiler version="3.16" />
      <compiler version="5.00" />
      <compiler version="5.01" />
      <compiler version="5.02" />
      <compiler version="5.03" />
      <compiler version="5.04" />
    </compilers>
    <config>
   package Linker is
      for Response_File_Format use "GCC_GNU";
      for Max_Command_Line_Length use "8192";
   end Linker;
    </config>
  </configuration>

   <configuration>
     <targets>
       <target name="^.*-wrs-vxworks.*$" />
       <target name="^.*-elf-lynx.*$" />
       <target name="^powerpc-elf$" />
       <target name="^powerpc-eabispe$" />
       <target name="^erc32-elf$" />
       <target name="^leon-elf$" />
       <target name="^leon3-elf$" />
       <target name="^arm-elf$" />
       <target name="^avr$" />
       <target name="^.*wrs-vxworks.*$" />
       <target name="^.*-elinos-linux$" />
       <target name="^.*mingw.*$" />
       <target name="^.*linux.*$" />
       <target name="^.*freebsd.*$" />
     </targets>
    <compilers negate="true">
       <compiler language="C++" />
       <compiler language="Fortran" />
    </compilers>
    <compilers>
       <compiler language="Ada" />
    </compilers>
    <compilers>
      <compiler version="3.16" />
      <compiler version="5.00" />
      <compiler version="5.01" />
      <compiler version="5.02" />
      <compiler version="5.03" />
      <compiler version="5.04" />
    </compilers>
    <config>
   package Linker is
      for Response_File_Format use "GNU";
      for Max_Command_Line_Length use "8192";
   end Linker;
    </config>
  </configuration>



  <configuration>
    <targets>
      <target name="^.*aix.*$" />
      <target name="^.*hpux.*$" />
      <target name="^.*irix.*$" />
      <target name="^.*osf.*$" />
    </targets>
    <compilers negate="true">
       <compiler language="C++" />
       <compiler language="Fortran" />
    </compilers>
    <compilers>
       <compiler language="Ada" />
    </compilers>
    <compilers negate="true">
      <compiler version="3.16" />
      <compiler version="5.00" />
      <compiler version="5.01" />
      <compiler version="5.02" />
      <compiler version="5.03" />
      <compiler version="5.04" />
    </compilers>
    <config>
   package Linker is
      for Response_File_Format use "GCC_Object_List";
   end Linker;
    </config>
  </configuration>


  <configuration>
    <compilers negate="true">
       <compiler language="C++" />
       <compiler language="Fortran" />
       <compiler language="Ada" />
    </compilers>
    <compilers>
       <compiler language="C" />
    </compilers>
    <config>
   package Linker is
      for Driver use Compiler'Driver ("C");
   end Linker;
    </config>
  </configuration>

 <!-- Default language is Ada, C, Fortran, C++ in that order -->

  <configuration>
    <compilers>
       <compiler language="Ada" />
    </compilers>
    <config>
   for Default_Language use "Ada";
    </config>
  </configuration>

  <configuration>
    <compilers negate="true">
       <compiler language="Ada" />
    </compilers>
    <compilers>
       <compiler language="C" />
    </compilers>
    <config>
   for Default_Language use "C";
    </config>
  </configuration>

  <configuration>
    <compilers negate="true">
       <compiler language="C" />
       <compiler language="Ada" />
    </compilers>
    <compilers>
       <compiler language="Fortran" /></compilers>
    <config>
   for Default_Language use "Fortran";
    </config>
  </configuration>

  <configuration>
    <compilers negate="true">
       <compiler language="C" />
       <compiler language="Fortran" />
       <compiler language="Ada" />
    </compilers>
    <compilers>
       <compiler language="C++" />
    </compilers>
    <config>
   for Default_Language use "C++";
    </config>
  </configuration>

</gprconfig>