[FFmpeg-devel] [PATCH 3/4] avutil/eval: check av_expr_parse_and_eval error code in the test build

[Ganesh Ajjanagadde]

On Sun, Nov 1, 2015 at 12:52 PM, Michael Niedermayer
<michael at niedermayer.cc> wrote:
> On Sat, Oct 31, 2015 at 10:47:56AM -0400, Ganesh Ajjanagadde wrote:
>> This returns the error code from main in the test, in this case ENOMEM.
>> This should not matter, and will ensure that no warnings are triggered
>> when av_warn_unused_result is added to avutil/eval.h.
>>
>> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>
>> ---
>>  libavutil/eval.c | 22 +++++++++++++---------
>>  1 file changed, 13 insertions(+), 9 deletions(-)
>
> breaks fate
>
> TEST    eval
> --- ./tests/ref/fate/eval       2015-10-30 03:22:52.209691909 +0100
> +++ tests/data/fate/eval        2015-11-01 18:48:37.730502524 +0100
> @@ -1,281 +1 @@
>  Evaluating ''
> -'' -> nan
> -
> -Evaluating '1;2'
> -'1;2' -> 2.000000
> -
> -Evaluating '-20'
> -'-20' -> -20.000000
> -
> -Evaluating '-PI'
> -'-PI' -> -3.141593
> -
> [...]
> -12.700000 == 12.7
> -0.931323 == 0.931322575
> Test eval failed. Look at tests/data/fate/eval.err for details.
> make: *** [fate-eval] Error 234
> make: *** Waiting for unfinished jobs....
>
> cat tests/data/fate/eval.err
> [Eval @ 0x7ffe40285770] Undefined constant or missing '(' in ''

So I know why this occurs: it is the first condition with the nan
stuff, which returns an error code < 0. There are various methods I
can think of:
1. Let the fate build be slightly noisy, with one -Warn-unused-result for this.
2. Simply do a ret = av_expr_parse_and_eval(...) for the first one.
This kills the warning, and is quite readable.
3. in addition to the above, do a check for ENOMEM. I find this quite
silly, since it is a test build.

Let me know what you prefer, and sorry for not being thorough with this.

>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
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>
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