(autoconf.info)Canonicalizing

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8.2 Getting the Canonical System Type
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The following macros make the system type available to 'configure'
scripts.  They run the shell script 'config.guess' to determine any
values for the host, target, and build types that they need and the user
did not specify on the command line.  They run 'config.sub' to
canonicalize any aliases the user gave.  If you use these macros, you
must distribute those two shell scripts along with your source code.
Note: Output, for information about the 'AC_CONFIG_AUX_DIR' macro
which you can use to control which directory 'configure' looks for those
scripts in.  If you do not use either of these macros, 'configure'
ignores any '--host', '--target', and '--build' options given to it.

 -- Macro: AC_CANONICAL_SYSTEM
     Determine the system type and set output variables to the names of
     the canonical system types.  Note: System Type Variables, for
     details about the variables this macro sets.

 -- Macro: AC_CANONICAL_HOST
     Perform only the subset of 'AC_CANONICAL_SYSTEM' relevant to the
     host type.  This is all that is needed for programs that are not
     part of a compiler toolchain.

 -- Macro: AC_VALIDATE_CACHED_SYSTEM_TUPLE (CMD)
     If the cache file is inconsistent with the current host, target and
     build system types, execute CMD or print a default error message.