[FFmpeg-devel] [PATCH] configure: check if NAN can be used as a constant initializer

[James Almer]

On 9/13/2017 2:23 PM, Carl Eugen Hoyos wrote:
> 2017-09-13 19:10 GMT+02:00 James Almer <jamrial at gmail.com>:
>> Some targets, like NetBSD and DJGPP, don't seem to support it.
>>
>> Signed-off-by: James Almer <jamrial at gmail.com>
>> ---
>>  configure | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/configure b/configure
>> index ab1550d39b..4855ca54c9 100755
>> --- a/configure
>> +++ b/configure
>> @@ -3222,6 +3222,7 @@ pixfmts_super2xsai_test_deps="super2xsai_filter"
>>  tinterlace_filter_deps="gpl"
>>  tinterlace_merge_test_deps="tinterlace_filter"
>>  tinterlace_pad_test_deps="tinterlace_filter"
>> +tonemap_filter_deps="const_nan"
> 
> No objections but what was wrong with using another
> default to avoid the additional check?

DBL_MIN and DBL_MAX are both valid values for the option. Turning one of
them into "auto" does not seem like a good idea to me.

If someone else has a better solution than a simple check for broken
toolchains at configure time then I'll drop this patch.