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/usr/share/gprconfig/cpp.xml is in gprbuild 2015-6.

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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 ".hh";
      for Body_Suffix ("C++") use ".cpp";
   end Naming;
   for Inherit_Source_Path ("C++") use ("C");
     </config>
   </configuration>

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

   package Clean is
      for Source_Artifact_Extensions ("C++") use (".gli", ".stdout", ".stderr");
      for Object_Artifact_Extensions ("C++") use (".s", "ci", ".gcno");
   end Clean;
     </config>
   </configuration>

   <configuration>
     <compilers>
        <compiler name="G++-WRS653" language="C++" />
        <compiler name="G++-WRS653-E500V2" language="C++" />
        <compiler name="G++-WRS5" language="C++" />
        <compiler name="G++-WRS6" language="C++" />
        <compiler name="G++-WRS6E500V2" language="C++" />
        <compiler name="G++-WRS6LEON" language="C++" />
        <compiler name="G++-WRS6CERT" language="C++" />
        <compiler name="G++-WRS6CERTE500V2" language="C++" />
        <compiler name="G++-WRS7ARM" language="C++" />
        <compiler name="G++-WRS7E500V2" language="C++" />
        <compiler name="G++-WRS7PPC" language="C++" />
        <compiler name="G++-WRS7X86" language="C++" />
        <compiler name="G++-WRSMILS" language="C++" />
        <compiler name="G++-WRSMILSHAE" language="C++" />
        <compiler name="G++-WRSMILS-E500V2" language="C++" />
        <compiler name="G++-WRSMILSHAE-E500V2" language="C++" />
    </compilers>
     <config>
   package Compiler is
      for Driver              ("C++") use "${PATH(c++)}c++${PREFIX(c++)}";
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
        <compiler name="G++" language="C++" />
        <compiler name="G++_Pro" language="C++" />
        <compiler name="G++-WRS653" language="C++" />
        <compiler name="G++-WRS653-E500V2" language="C++" />
        <compiler name="G++-WRSMILS" language="C++" />
        <compiler name="G++-WRSMILSHAE" language="C++" />
        <compiler name="G++-WRSMILS-E500V2" language="C++" />
        <compiler name="G++-WRSMILSHAE-E500V2" language="C++" />
        <compiler name="G++-WRS6" language="C++" />
        <compiler name="G++-WRS6E500V2" language="C++" />
        <compiler name="G++-WRS6LEON" language="C++" />
        <compiler name="G++-WRS6CERT" language="C++" />
        <compiler name="G++-WRS6CERTE500V2" language="C++" />
        <compiler name="G++-WRS7ARM" language="C++" />
        <compiler name="G++-WRS7E500V2" language="C++" />
        <compiler name="G++-WRS7PPC" language="C++" />
        <compiler name="G++-WRS7X86" language="C++" />
        <compiler name="GCC-CYGMING" language="C++" />
       <compiler name="GCC-MINGW32" language="C++" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches   ("C++") use
        ("-c", "-x", "c++") &amp;
        Compiler'Leading_Required_Switches ("C++");
      for Dependency_Switches ("C++") use ("-MMD", "-MF", "");
      for Include_Path        ("C++") use "CPATH";
   end Compiler;
     </config>
   </configuration>

   <!-- G++-WRS5 does not support -MF switch -->
   <configuration>
     <compilers>
        <compiler name="G++-WRS5" language="C++" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches   ("C++") use
        Compiler'Leading_Required_Switches ("C++") &amp;
        ("-c", "-x", "c++");
      for Dependency_Switches ("C++") use ("-Wp,-MMD,");
      for Include_Path        ("C++") use "CPATH";
   end Compiler;
     </config>
   </configuration>

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

   <configuration>
     <compilers>
       <compiler name="G++" language="C++" />
       <compiler name="G++_Pro" language="C++" />
     </compilers>
     <targets negate="true">
       <target name="^.*LynxOS.*$" />
       <target name="^.*mingw.*$" />
       <target name="^.*cygwin.*$" />
       <target name="^.*tru64.*$" />
     </targets>
     <config>
   package Compiler is
      for PIC_Option      ("C++") use ("-fPIC");
   end Compiler;
     </config>
   </configuration>

   <!-- in cygminw mode, 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>

   <!-- this compiler is not compatible with GNAT's default zcx runtime -->
   <configuration>
     <compilers><compiler name="GNAT" runtime="default" /></compilers>
     <compilers>
       <compiler name="GCC-CYGMING" language="C++" />
       <compiler name="GCC-CYGMING" language="Fortran" />
       <compiler name="GCC-MINGW32" language="C++" />
       <compiler name="GCC-MINGW32" language="Fortran" />
     </compilers>
     <config></config>
   </configuration>

   <!-- VxWorks 7.x C++ support using the WRS compilers  -->

   <configuration>
     <compilers>
       <compiler name="G++-WRS7ARM" runtime="^kernel$" />
       <compiler name="G++-WRS7PPC" runtime="^kernel$" />
       <compiler name="G++-WRS7E500V2" runtime="^kernel$" />
       <compiler name="G++-WRS7X86" runtime="^kernel$" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C++") use
        Compiler'Leading_Required_Switches ("C++")
        &amp; ("-I" &amp; VSB_Dir &amp; "/h",
               "-I" &amp; VSB_Dir &amp; "/share/h",
               "-I" &amp; VSB_Dir &amp; "/krnl/h/system",
               "-I" &amp; VSB_Dir &amp; "/krnl/h/public",
               "-D_WRS_KERNEL");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="G++-WRS7ARM" runtime="^rtp$" />
       <compiler name="G++-WRS7PPC" runtime="^rtp$" />
       <compiler name="G++-WRS7E500V2" runtime="^rtp$" />
       <compiler name="G++-WRS7X86" runtime="^rtp$" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C++") use
        Compiler'Leading_Required_Switches ("C++") &amp; ("-mrtp")
        &amp; ("-I" &amp; VSB_Dir &amp; "/h",
               "-I" &amp; VSB_Dir &amp; "/share/h",
               "-I" &amp; VSB_Dir &amp; "/usr/h/public",
               "-I" &amp; VSB_Dir &amp; "/usr/h");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="G++-WRS7ARM" />
       <compiler name="G++-WRS7E500V2" />
       <compiler name="G++-WRS7PPC" />
       <compiler name="G++-WRS7X86" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C++") use
        Compiler'Leading_Required_Switches ("C++")
        &amp; ("-DTOOL_FAMILY=gnu",
               "-DTOOL=gnu",
               "-D_VSB_CONFIG_FILE=&lt;config/vsbConfig.h&gt;");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="G++-WRS7ARM" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C++") use
        Compiler'Leading_Required_Switches ("C++")
        &amp; ("-DCPU=_VX_ARMARCH7",
               "-t7",
               "-mfpu=vfp",
               "-mfloat-abi=softfp");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="G++-WRS7E500V2" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C++") use
        Compiler'Leading_Required_Switches ("C++")
        &amp; ("-DCPU=_VX_PPCE500V2",
               "-te500v2",
               "-mhard-float",
               "-mstrict-align");
   end Compiler;
     </config>
   </configuration>

   <configuration>
     <compilers>
       <compiler name="G++-WRS7PPC" />
     </compilers>
     <config>
   package Compiler is
      for Leading_Required_Switches ("C++") use
        Compiler'Leading_Required_Switches ("C++")
        &amp; ("-DCPU=_VX_PPCE500MC",
               "-mno-powerpc-gfxopt",
               "-mno-isel");
   end Compiler;
     </config>
   </configuration>

</gprconfig>