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(autoconf.info)ifnames Invocation

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Using `ifnames' to List Conditionals
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   `ifnames' can help you write `configure.ac' for a software package.
It prints the identifiers that the package already uses in C
preprocessor conditionals.  If a package has already been set up to have
some portability, `ifnames' can thus help you figure out what its
`configure' needs to check for.  It may help fill in some gaps in a
`configure.ac' generated by `autoscan' (Note: autoscan Invocation).

   `ifnames' scans all of the C source files named on the command line
(or the standard input, if none are given) and writes to the standard
output a sorted list of all the identifiers that appear in those files
in `#if', `#elif', `#ifdef', or `#ifndef' directives.  It prints each
identifier on a line, followed by a space-separated list of the files
in which that identifier occurs.

`ifnames' accepts the following options:

`--help'
`-h'
     Print a summary of the command line options and exit.

`--version'
`-V'
     Print the version number of Autoconf and exit.