(autocf21.info.gz) Invoking ifnames

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 2.3 Using `ifnames' to List Conditionals
 ========================================
 
 `ifnames' can help when writing a `configure.in' 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, this program can help you figure out what its
 `configure' needs to check for.  It may help fill in some gaps in a
 `configure.in' generated by `autoscan' ( Invoking autoscan).
 
    `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.
 
 `--macrodir=DIR'
 `-m DIR'
      Look for the Autoconf macro files in directory DIR instead of the
      default installation directory.  Only used to get the version
      number.  You can also set the `AC_MACRODIR' environment variable
      to a directory; this option overrides the environment variable.
 
 `--version'
      Print the version number of Autoconf and exit.
 

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