configure uses some other scripts to help in its work:
config.guessfiles, kept in the top level directory, are used. FIXME: when is the
config.guessfile in the
gccdirectory (that just calls the top level one) used?
config.gccis used to handle configuration specific to the particular build, host or target machine. (In general, this should only be used for features that cannot reasonably be tested in Autoconf feature tests.) See The
config.gccFile, for details of the contents of this file.
/config-lang.inthat is used for front-end-specific configuration. See The Front End
config-lang.inFile, for details of this file.
configure.fragis used as part of creating the output of