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       cflow - analyze control flow in C source files


       cflow [option...] file...

       cflow {--help | --usage | --version | -V}


       This manual page documents briefly the cflow command.

       This manual page was written for the Debian distribution because the
       original program does not have a manual page. Instead, it has
       documentation in the GNU info(1) format.

       GNU cflow analyzes a collection of C source files and prints a graph,
       charting control flow within the program.

       GNU cflow is able to produce both direct and inverted flowgraphs for C
       sources. Optionally a cross-reference listing can be generated. Two
       output formats are implemented: POSIX and GNU (extended).

       Input files can optionally be preprocessed before analyzing.


       A summary of options is included below. For a complete description, see
       the info(1) files.

       The program follows the usual GNU command line syntax, with long
       options starting with two dashes (-). Mandatory or optional arguments
       to long options are also mandatory or optional for any corresponding
       short options.

       The effect of each option marked with an asterisk is reversed if the
       option's long name is prefixed with ‘no-’. For example, ‘--no-cpp’
       cancels ‘--cpp’.

   General options
       -d, --depth=number
           Set the depth at which the flowgraph is cut off.

       -f, --format=name
           Use given output format name. Valid names are ‘gnu’ (default) and

       -i, --include=classes
           Include specified classes of symbols (see below). Prepend classes
           with ^ or - to exclude them from the output.

           Symbols classes:

               symbols whose names begin with an underscore

               static symbols

               typedefs (for cross-references only)

               all data symbols, both external and static

       -o, --output=file
           Set output file name. Default is -, meaning standard output.

       -r, --reverse
           * Print reverse call graph.

       -x, --xref
           Produce cross-reference listing only.

   Parser control
       -a, --ansi
           * Accept only sources in ANSI C.

       -D, --define=name[=defn]
           Predefine name as a macro.

       -I, --include-dir=dir
           Add the directory dir to the list of directories to be searched for
           header files.

       -m, --main=name
           Assume main function to be called name.

       -p, --pushdown=number
           Set initial token stack size to number.

       --preprocess[=command], --cpp[=command]
           * Run the specified preprocessor command.

       -s, --symbol=symbol:type
           Register symbol with given type. Valid types are: ‘keyword’ (or
           ‘kw’), ‘modifier’, ‘identifier’, ‘type’, ‘wrapper’. Any unambiguous
           abbreviation of the above is also accepted.

       -S, --use-indentation
           * Use source file indentation as a hint.

       -U, --undefine=name
           Cancel any previous definition of name.

   Output control
       -b, --brief
           * Use brief output.

           * Additionally format output for use with GNU Emacs.

       -l, --print-level
           * Print nesting level along with the call graph.

           Use string when indenting to each new level.

       -n, --number
           * Print line numbers.

           * Do not print argument lists in function declarations.

           * Do not print symbol names in declaration strings.

       -T, --tree
           * Draw ASCII art tree.

   Informational options
           Set debugging level.

       -v, --verbose
           * Verbosely list any any errors encountered in the input files.

       -?, --help
           Display help and exit.

           Display short usage message and exit.

       -V, --version
           Display version information and exit.


       Jakub Wilk <>
           Wrote this manpage for the Debian system.


       Copyright © 1997, 2005, 2007 Sergey Poznyakoff
       Copyright © 2009 Jakub Wilk

       This manual page was written for the Debian system (and may be used by

       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU General Public License Version 3, as
       published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License
       Version 3 can be found in /usr/share/common-licenses/GPL-3.