[Gluster-devel] Proposal: Using LLVM clang-analyzer in gluster development

[Prasanna Kalever]

Hi gluster team, 

Proposal:

Using Clang static analyzer tool for gluster project


About Clang:

>From a very high level view, Clang has two features

1. Clang as a compiler
2. Clang as a code analyzer

The Idea hear is to use second point i.e Clang as code analyzer and still gcc
will be our default compiler.

The Clang Static Analyzer is a source code analysis tool that finds bugs in C,
C++, and Objective-C programs. Given the exact same code base, clang-analyzer
reported ~70 potential issues. clang is an awesome and free tool.

The reports from clang-analyzer are in HTML and there's a single file for each
issue and it generates a nice looking source code with embedded comments about
which flow that was followed all the way down to the problem.


Why Clang-Analyzer: (Advantages)

 1. Since its is an open source tool:
       
  * Available to all the developers
  * Easy Access, we can run the tool while we compile the code (say $ scan-build make)
  * No restrictions on Number of Runs per week/day/hour/min ..
  * Defects are Identified before submitting a patch, thus very less chance of
    defect injection into project

 2. The Html view of clang is very impressive with all the source code including
    comments of clang-analyzer, which lead to defect line number directly .



I have attached a sample clang results for geo-replication module run on latest
3.7+ glusterfs code, please find them above.


Thanks for your time.


Best Regards, 
Prasanna Kumar K. 

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