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Date: Wed, 31 Aug 2011 16:01:49 +0200
From: Rodolfo kix Garcia <kix@kix.es>
To: <9fans@9fans.net>
In-Reply-To: <3ad045e675c92ccadaa4dcb0e5f36a38@quintile.net>
References: <3ad045e675c92ccadaa4dcb0e5f36a38@quintile.net>
Message-ID: <f9ff261d9f323a62a39bec78297219b9@kix.es>
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Subject: Re: [9fans] c code differencing
Topicbox-Message-UUID: 178b7e0e-ead7-11e9-9d60-3106f5b1d025

On Wed, 31 Aug 2011 14:01:34 +0100, Steve Simon wrote:
> Anyone have any pointers to a diff for C code.
>
> I have two libraries, A and B.
>
> B is and expanded and modified version of A and I have been
> asked to extract A from B to build two libraries one
> built on top of the other.
>
> What I think I need is a program which parses C and will
> do diffs at the level of functions, globals , #defines and enums.
>
> it would ideally have two input files and generate two outputs
> one output being the common code, one with the extensions on the
> common.
>
> I don't expect this to be fully automated, there is going to be a
> load
> of hand edition before I am done, but is there somthing which can do
> the easy stuff for me?
>
> -Steve

Why don't use a C preprocessor to do that?
You can have one file with ifdefs, and print the two files using an
argument

Example:

#ifdef LIBA
#include <windows.h>
#else
#include <unistd.h>
#endif

and run

"cpp -DLIBA ..." and
"cpp -ULIBA ..." or "cpp ..."


--
||// //\\// Rodolfo "kix" Garcia
||\\// //\\ http://www.kix.es/