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 (see section Using autoscan to Create `configure.in').
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
--macrodir=dir
-m dir
AC_MACRODIR
environment variable to a directory; this option overrides the
environment variable.
--version
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