Re: [9fans] c code differencing

[Rodolfo kix Garcia <kix@kix.es>]

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 ..."


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