(autoconf.info.gz) ifnames Invocation

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 Using `ifnames' to List Conditionals
 ====================================
 
    `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' ( 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.
 

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