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/usr/share/gprconfig/c.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 package provides the default standard options for a gcc
         C compiler -->

   <configuration>
     <compilers>
       <compiler language="C" />
     </compilers>
     <config>
   package Naming is
      for Spec_Suffix ("C") use ".h";
      for Body_Suffix ("C") use ".c";
   end Naming;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="GCC" language="C" />
       <compiler name="GCC-28" language="C" />
       <compiler name="GCC-CYGMING" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Driver              ("C") use "${PATH(c)}${PREFIX(c)}gcc-4.6";
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
        <compiler name="GCC-MINGW32" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Driver              ("C") use "${PATH(c)}gcc${PREFIX(c)}";
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="GCC-WRS5" language="C" />
       <compiler name="GCC-WRS6" language="C" />
       <compiler name="GCC-WRS6CERT" language="C" />
       <compiler name="GCC-WRS6E500V2" language="C" />
       <compiler name="GCC-WRS653" language="C" />
       <compiler name="GCC-WRSMILS" language="C" />
       <compiler name="GCC-WRSMILSHAE" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Driver              ("C") use "${PATH(c)}cc${PREFIX(c)}";
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="DIABC-PPC" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Driver              ("C") use "${PATH(c)}dcc";
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="GCC" language="C" />
       <compiler name="GCC-28" language="C" />
       <compiler name="GCC-CYGMING" language="C" />
       <compiler name="GCC-MINGW32" language="C" />
       <compiler name="GCC-WRS5" language="C" />
       <compiler name="GCC-WRS6" language="C" />
       <compiler name="GCC-WRS6E500V2" language="C" />
       <compiler name="GCC-WRS6CERT" language="C" />
       <compiler name="GCC-WRS653" language="C" />
       <compiler name="GCC-WRSMILS" language="C" />
       <compiler name="GCC-WRSMILSHAE" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches   ("C") use
         Compiler'Leading_Required_Switches ("C") &amp; ("-c", "-x", "c");
      for Include_Path        ("C") use "CPATH";
   end Compiler;
     </config>
   </configuration>

  <!--     GCC 2.8.1 & VxWorks 5
   Switch -MMD is not supported on GCC 2.8.1. So, we use an undocumented
   switch. -MF is not supported by the VxWorks 5 gcc
   -->
   <configuration>
     <compilers>
       <compiler name="GCC-28" language="C" />
       <compiler name="GCC-WRS5" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Dependency_Switches ("C") use ("-Wp,-MMD,");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="GCC" language="C" />
       <compiler name="GCC-CYGMING" language="C" />
       <compiler name="GCC-MINGW32" language="C" />
       <compiler name="GCC-WRS6" language="C" />
       <compiler name="GCC-WRS6E500V2" language="C" />
       <compiler name="GCC-WRS6CERT" language="C" />
       <compiler name="GCC-WRS653" language="C" />
       <compiler name="GCC-WRSMILS" language="C" />
       <compiler name="GCC-WRSMILSHAE" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Dependency_Switches ("C") use ("-MMD", "-MF", "");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="DIABC-PPC" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches   ("C") use
         Compiler'Leading_Required_Switches ("C") &amp; ("-tPPC750EH:cross", "-c");
      for Dependency_Switches ("C") use
         ("-Xmake-dependency=6", "-Xmake-dependency-savefile=");
      for Include_Path        ("C") use "CPATH";
   end Compiler;
     </config>
   </configuration>

   <!--  Additional switches needed on some platforms -->

   <configuration>
     <compilers>
       <compiler name="GCC" language="C" />
       <compiler name="GCC-28" language="C" />
     </compilers>
     <targets negate="true">
       <target name="^.*LynxOS.*$" />
       <target name="^.*mingw.*$" />
       <target name="^.*cygwin.*$" />
       <target name="^.*dec-osf.*$" />
       <target name="^.*wrs-vxworks.*$" />
     </targets>
     <config>
   package Compiler is
      for PIC_Option ("C") use ("-fPIC");
   end Compiler;
     </config>
   </configuration>

  <!-- for cygming we make sure that the option -mno-cygwin is used -->
   <configuration>
     <compilers>
       <compiler name="GCC-CYGMING" language="C" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C") use
        Compiler'Leading_Required_Switches ("C") &amp; ("-mno-cygwin");
   end Compiler;
     </config>
   </configuration>
</gprconfig>