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Steps of Cross-Compilation
--------------------------

   To compile and run a program using a cross-compiler involves several
steps:

   * Run the cross-compiler on the host machine to produce assembler
     files for the target machine.  This requires header files for the
     target machine.

   * Assemble the files produced by the cross-compiler.  You can do this
     either with an assembler on the target machine, or with a
     cross-assembler on the host machine.

   * Link those files to make an executable.  You can do this either
     with a linker on the target machine, or with a cross-linker on the
     host machine.  Whichever machine you use, you need libraries and
     certain startup files (typically `crt....o') for the target
     machine.

   It is most convenient to do all of these steps on the same host
machine, since then you can do it all with a single invocation of GNU
CC.  This requires a suitable cross-assembler and cross-linker.  For
some targets, the GNU assembler and linker are available.