17.3 Using autoupdate to Modernize configure.ac
The autoupdate program updates a configure.ac file that
calls Autoconf macros by their old names to use the current macro names.
In version 2 of Autoconf, most of the macros were renamed to use a more
uniform and descriptive naming scheme. See Macro Names, for a
description of the new scheme. Although the old names still work
(see Obsolete Macros, for a list of the old macros and the corresponding
new names), you can make your configure.ac files more readable
and make it easier to use the current Autoconf documentation if you
update them to use the new macro names.
If given no arguments, autoupdate updates configure.ac,
backing up the original version with the suffix ~ (or the value
of the environment variable
SIMPLE_BACKUP_SUFFIX, if that is
set). If you give autoupdate an argument, it reads that file
instead of configure.ac and writes the updated file to the
autoupdate accepts the following options:
- Print a summary of the command line options and exit.
- Print the version number of Autoconf and exit.
- Report processing steps.
- Don't remove the temporary files.
- Force the update even if the file has not changed. Disregard the cache.
- -I dir
- Also look for input files in dir. Multiple invocations accumulate.
Directories are browsed from last to first.