On Sat,  3 Oct 2015 07:41:00 -0500
Ganesh Ajjanagadde <gajjanaga...@gmail.com> wrote:

> Glibc 2.20 onwards generates a deprecation warning for usage of _BSD_SOURCE 
> and _SVID_SOURCE.
> The solution from man feature_test_macros is to define both _DEFAULT_SOURCE 
> and the old macros.
> This solution is on the lines of the one in commit 
> af1818276ef271af98e2e2bbabb4dc875b4fa7d8.
> 
> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
> ---
>  libavformat/img2dec.c | 1 +
>  libavformat/udp.c     | 1 +
>  libswscale/utils.c    | 1 +
>  3 files changed, 3 insertions(+)
> 
> diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
> index 1697579..0cbcf4a 100644
> --- a/libavformat/img2dec.c
> +++ b/libavformat/img2dec.c
> @@ -20,6 +20,7 @@
>   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 
> USA
>   */
>  
> +#define _DEFAULT_SOURCE
>  #define _BSD_SOURCE
>  #include <sys/stat.h>
>  #include "libavutil/avstring.h"
> diff --git a/libavformat/udp.c b/libavformat/udp.c
> index d40ea97..1bda5af 100644
> --- a/libavformat/udp.c
> +++ b/libavformat/udp.c
> @@ -24,6 +24,7 @@
>   * UDP protocol
>   */
>  
> +#define _DEFAULT_SOURCE
>  #define _BSD_SOURCE     /* Needed for using struct ip_mreq with recent glibc 
> */
>  
>  #include "avformat.h"
> diff --git a/libswscale/utils.c b/libswscale/utils.c
> index eb1c940..651b07a 100644
> --- a/libswscale/utils.c
> +++ b/libswscale/utils.c
> @@ -20,6 +20,7 @@
>  
>  #include "config.h"
>  
> +#define _DEFAULT_SOURCE
>  #define _SVID_SOURCE // needed for MAP_ANONYMOUS
>  #define _DARWIN_C_SOURCE // needed for MAP_ANON
>  #include <inttypes.h>

IMHO much better than the previous attempts, and likely minimize the
potential for regressions.

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