Re: [PATCH] Fix g++ warning about void* used in arithmetic

[Daniel Gollub <daniel.gollub@t-online.de>]

Hi Jens,

On Wed, 12 Feb 2014 21:11:21 -0700, Jens Axboe wrote:
> On 2014-02-12 11:25, Daniel Gollub wrote:
> > ../parse.h: In function ‘void* td_var(thread_options*, fio_option*,
> > unsigned int)’: ../parse.h:110:10: warning: pointer of type ‘void
> > *’ used in arithmetic [-Wpointer-arith] ../parse.h:112:9: warning:
> > pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]
> 
> I bet there are a lot of these, or other similar code that would
> prevent compiling with g++. I'm dubious of the value add here. Fio is
> written in C, after all.
> 

I should have mentioned this in the commit message: this is required to
compile an external ionengine written in C++. I do not try to compile
entire fio with g++. If I include fio.h in the external ioengine,
parse.h gets included by fio.h or so and causes this g++ warning.

This was the last warning (which just got introduced 2 days
ago) when fio.h gets included by an external engine build with g++.

So the value here is to build external ioengines against libraries/APIs
which are only available in C++. In my case against an internal library
of CEPH.


-- 
Daniel Gollub