[FFmpeg-devel] [PATCH] avutil/attributes: add av_warn_unused_result

[Michael Niedermayer]

On Mon, Oct 05, 2015 at 01:45:12AM -0400, Ganesh Ajjanagadde wrote:
> GCC 3.4 introduced an attribute warn_unused_result to warn when a programmer
> discards the return value. Applying this judiciously across the codebase can help
> in fixing a lot of problems. At a high level, functions which return error codes
> should always be checked. More concretely, consider the functions ff_add_format
> and the like in avfilter/formats.h. A quick examination shows that a large portion
> of libavfilter fails to handle the associated errors, usually AVERROR(ENOMEM).
> The above example was where I observed the utility of this, but it should be
> useful in many places across the code base.
> 
> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
> ---
>  libavutil/attributes.h | 6 ++++++
>  1 file changed, 6 insertions(+)

applied

thanks

[...]

--
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Awnsering whenever a program halts or runs forever is
On a turing machine, in general impossible (turings halting problem).
On any real computer, always possible as a real computer has a finite number
of states N, and will either halt in less than N cycles or never halt.
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