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TARGET OPTIONS
       By  default, GNU CC compiles code for the same type of ma-
       chine that you are using.  However, it  can  also  be  in-
       stalled  as  a  cross-compiler,  to compile for some other
       type of machine.  In fact,  several  different  configura-
       tions of GNU CC, for different target machines, can be in-
       stalled side by side.  Then you specify which one  to  use
       with the `-b' option.

       In addition, older and newer versions of GNU CC can be in-
       stalled side by side.  One of them (probably  the  newest)
       will be the default, but you may sometimes wish to use an-
       other.

       -b machine
              The argument machine specifies the  target  machine
              for  compilation.  This is useful when you have in-
              stalled GNU CC as a cross-compiler.

              The value to use for machine is  the  same  as  was
              specified  as the machine type when configuring GNU
              CC as a cross-compiler.  For example, if  a  cross-
              compiler  was  configured  with  `configure i386v',
              meaning to compile for an 80386 running  System  V,
              then you would specify `-b i386v' to run that cross
              compiler.

              When you do not specify `-b', it normally means  to
              compile  for  the same type of machine that you are
              using.

       -V version
              The argument version specifies which version of GNU
              CC  to  run.  This is useful when multiple versions
              are  installed.   For  example,  version  might  be
              `2.0', meaning to run GNU CC version 2.0.

              The  default version, when you do not specify `-V',
              is controlled by the way GNU CC is installed.  Nor-
              mally, it will be a version that is recommended for
              general use.