GNU cflow is a flow graph generator

Call graph

A call graph is a directed graph that represents calling relationships between subroutines in a computer program. Specifically, each node represents a procedure and each edge indicates that procedure f calls procedure g...

 that is part of the GNU Project

GNU Project

The GNU Project is a free software, mass collaboration project, announced on September 27, 1983, by Richard Stallman at MIT. It initiated GNU operating system development in January, 1984...

. It reads a collection of C

C (programming language)

C is a general-purpose computer programming language developed between 1969 and 1973 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system....

 source files and generate a C flow graph of external references. It uses only sources and doesn't need running the program.

History

It was initially an implementation of the cflow UNIX

Unix

Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...

 utility.

cflow (UNIX utility)

cflow is a unix utility generating a C-language flowgraph.

Besides GNU, there are other implementations of cflow, like the one for Tru64 Unix

Tru64 UNIX

Tru64 UNIX is a 64-bit UNIX operating system for the Alpha instruction set architecture , currently owned by Hewlett-Packard . Previously, Tru64 UNIX was a product of Compaq, and before that, Digital Equipment Corporation , where it was known as Digital UNIX .As its original name suggests, Tru64...

.

External links

• Source code on the GNU Savannah
  GNU Savannah
  GNU Savannah is a project of the Free Software Foundation initiated by Loïc Dachary, which serves as a collaborative software development management system for Free Software projects. Savannah currently offers CVS, GNU arch, Subversion, Git, Mercurial, Bazaar, mailing list, web hosting, file...
  
   platform.
• GNU cflow on the Free Software Directory
  Free Software Directory
  The Free Software Directory is a project of the Free Software Foundation . It catalogs free software that runs under free operating systems - particularly GNU and Linux. The project was formerly co-run by UNESCO....
  
  .