Hi, On Thu, Sep 17, 2015 at 7:51 AM, Michael Niedermayer <michae...@gmx.at> wrote:
> On Thu, Sep 17, 2015 at 06:54:37AM -0400, Ganesh Ajjanagadde wrote: > > On Thu, Sep 17, 2015 at 6:17 AM, Michael Niedermayer <michae...@gmx.at> > wrote: > > > On Wed, Sep 16, 2015 at 10:22:27PM -0400, Ganesh Ajjanagadde wrote: > > >> When compiled with --disable-pthreads, e.g > > >> > http://fate.ffmpeg.org/report.cgi?time=20150917015044&slot=alpha-debian-qemu-gcc-4.7 > , > > >> a bunch of -Wunused-functions are reported due to missing header > guards > > >> around threading related functions. > > >> This patch should silence such warnings. > > >> > > >> Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com> > > >> --- > > >> libavcodec/alac.c | 2 ++ > > >> libavcodec/exr.c | 2 ++ > > >> libavcodec/ffv1dec.c | 4 ++++ > > >> libavcodec/flacdec.c | 2 ++ > > >> libavcodec/h264.c | 2 ++ > > >> libavcodec/huffyuvdec.c | 2 ++ > > >> libavcodec/mdec.c | 2 ++ > > >> libavcodec/mimic.c | 4 ++++ > > >> libavcodec/mpeg12dec.c | 2 ++ > > >> libavcodec/mpeg4videodec.c | 2 ++ > > >> libavcodec/pngdec.c | 2 ++ > > >> libavcodec/takdec.c | 2 ++ > > >> libavcodec/tta.c | 2 ++ > > >> libavcodec/vp3.c | 4 ++++ > > >> libavcodec/vp8.c | 2 ++ > > >> libavcodec/vp9.c | 2 ++ > > >> libavcodec/wavpack.c | 2 ++ > > >> 17 files changed, 40 insertions(+) > > > > > > av_unused might be simpler to silence these warnings than #if > > > > I do not think this is consistent at the moment across the codebase; > > sometimes we use header guards and sometimes we use av_unused. Please > > tell me if what the rationale is for either of them; I am fine either > > way. Any half decent compiler should anyway remove unused functions > > when compiled with optimizations. > > #ifs will be more work to maintain as they can break build if a new > function call or function is added. av_unused cannot break build > #ifs also make the code harder to read, especially if there are > already some #ifs there before > > #ifs make sense for non static symbols as they cannot be removed by > the compiler or linker generally > > #ifs could also be used to structure code in a file if for some > reason its unwanted to split it in several files > #ifs also gurantee that code is removed and this makes sense in > performance critical code > #ifs can be used for any group of lines not just functions/variables > as for av_unused Michael, how strong is your objection here? Me and wm4 seem to have a slight preference for #if over av_unused, since av_unused runs the risk of rotting with code over time. (Other devs should also voice opinions if they care.) Ronald _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
