cflow察看工程函数调用关系

http://savannah.gnu.org/projects/cflow

http://ftp.gnu.org/gnu/cflow/

https://github.com/tinyclub

http://www.tinylab.org/callgraph-draw-the-calltree-of-c-functions/

1.cflow版本:   //Calltree 不更新了，CFLOW还在更新中./configuremakemake install

Version 1.5 available
     posted by gray, Mon 16 May 2016 09:39:12 PM UTC - 0 replies

GNU cflow version 1.5 is available for download.

Changes in this release:

    Correctly handle functions returning struct/union (fixes bug #31792)
    Gracefully handle invalid inputs (fixes bug #44113)
    Debugging output goes to stderr
    Add a manpage
    Consistent use of exit codes

Version 1.4 released
     posted by gray, Tue 11 Oct 2011 09:08:54 PM UTC - 0 replies

GNU cflow version 1.4 is available for download.

The most important changes in this version are:

    Symbol aliases
    New syntactic class: qualifiers
    Speed up recursive call detection.
    Fix parsing of typedefs after struct.
    Fix the output of branch marks in tree mode.
    Fix processing of static inline functions (RH bug 650716).

 2.yum install graphviz    //得到dot 3.yum install gawk 4.tree2dotx (脚本,和gprof2dot.py一样）转换 .DOT图形格式   wget -c https://github.com/tinyclub/linux-0.11-lab/raw/master/tools/tree2dotx

callgraph = cflow + tree2dotx + dot  （callgraph自动化这个三个工具)

1.cflow：拿到函数调用关系  (calltree可以互换cflow)

1. cflow -b -m start_kernel init/main.c > start_kernel.txt

2.tree2dotx: 把函数调用树转换成 dot 格式

1. cat start_kernel.txt | tree2dotx > start_kernel.dot

3.用 dot 工具生成可以渲染的图片格式

这里仅以 svg 格式为例：

1. $ cat start_kernel.dot | dot -Tsvg -o start_kernel.svg