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(autoconf.info)Cache Checkpointing

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Cache Checkpointing
-------------------

   If your configure script, or a macro called from configure.ac,
happens to abort the configure process, it may be useful to checkpoint
the cache a few times at key points using `AC_CACHE_SAVE'.  Doing so
will reduce the amount of time it takes to re-run the configure script
with (hopefully) the error that caused the previous abort corrected.

 - Macro: AC_CACHE_LOAD
     Loads values from existing cache file, or creates a new cache file
     if a cache file is not found.  Called automatically from `AC_INIT'.

 - Macro: AC_CACHE_SAVE
     Flushes all cached values to the cache file.  Called automatically
     from `AC_OUTPUT', but it can be quite useful to call
     `AC_CACHE_SAVE' at key points in configure.ac.

   For instance:

      ... AC_INIT, etc. ...
     # Checks for programs.
     AC_PROG_CC
     AC_PROG_GCC_TRADITIONAL
      ... more program checks ...
     AC_CACHE_SAVE
     
     # Checks for libraries.
     AC_CHECK_LIB(nsl, gethostbyname)
     AC_CHECK_LIB(socket, connect)
      ... more lib checks ...
     AC_CACHE_SAVE
     
     # Might abort...
     AM_PATH_GTK(1.0.2,, [AC_MSG_ERROR([GTK not in path])])
     AM_PATH_GTKMM(0.9.5,, [AC_MSG_ERROR([GTK not in path])])
      ... AC_OUTPUT, etc. ...