ffmpeg and mmap

Andriy Gapon avg at freebsd.org
Sun Dec 12 21:08:59 UTC 2010

on 12/12/2010 22:52 Andriy Gapon said the following:
> on 12/12/2010 22:45 Kostik Belousov said the following:
>> On Sun, Dec 12, 2010 at 10:40:12PM +0200, Andriy Gapon wrote:
>>> To get around that issue _on Linux_, ffmpeg folks have put explicit
>>> _SVID_SOURCE definition right into the libswscale/utils.c file:
>>> #define _SVID_SOURCE //needed for MAP_ANONYMOUS
>>> For much the same reason we need to add the following for FreeBSD (as
>>> hackish as it is): #define __BSD_VISIBLE 1
>>> With that addition the code buffer is allocated properly and the code
>>> in it can be executed.
>> Applications should never define the symbols from reserved namespace,
>> in this case __BSD_VISIBLE. Right solution is to not define _POSIX_SOURCE.
> i agree with you, but I don't know why the ffmpeg folks decided to use
> _POSIX_C_SOURCE=200112 in the first place and what could break without it.

Actually the port seems to compile and work without any problems if I remove
_POSIX_C_SOURCE definition in two places in configure.

Andriy Gapon

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