(autoconf.info)System Type Variables

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8.3 System Type Variables
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After calling 'AC_CANONICAL_SYSTEM', the following output variables
contain the system type information.  After 'AC_CANONICAL_HOST', only
the 'host' variables below are set.

'build, host, target'
     the canonical system names;

'build_alias, host_alias, target_alias'
     the names the user specified, or the canonical names if
     'config.guess' was used;

'build_cpu, build_vendor, build_os'
'host_cpu, host_vendor, host_os'
'target_cpu, target_vendor, target_os'
     the individual parts of the canonical names (for convenience).