[Libav-user] Build of ffmpeg library with libx264 support for QNX

[Pavel Vazharov]

Hi Ramu,

I'm pretty sure that the symbols aren't present in the static libraries.
objdump and nm tools shows them as undefined:

# nm libavcodec/libavcodec.a | grep ff_h264dsp_init
         U ff_h264dsp_init
# objdump -t libavcodec/libavcodec.a | grep ff_h264dsp_init
00000000         *UND*  00000000 ff_h264dsp_init

# objdump -t libavcodec/libavcodec.a | grep ff_golomb_vlc_len
00000000         *UND*  00000000 ff_golomb_vlc_len
00000000         *UND*  00000000 ff_golomb_vlc_len
00000000         *UND*  00000000 ff_golomb_vlc_len
00000000         *UND*  00000000 ff_golomb_vlc_len
00000000         *UND*  00000000 ff_golomb_vlc_len
00000000         *UND*  00000000 ff_golomb_vlc_len
# nm libavcodec/libavcodec.a | grep ff_golomb_vlc_len
         U ff_golomb_vlc_len
         U ff_golomb_vlc_len
         U ff_golomb_vlc_len
         U ff_golomb_vlc_len
         U ff_golomb_vlc_len
         U ff_golomb_vlc_len

Besides, for exampe ff_h264dsp_init is defined in h264dsp.c, but I never
saw it to be build to .o file.
The above is true for all undefined symbols. Their files aren't built in
the process and I can see the symbols as undefined in the libavcodec
library.

Regards,
Pavel.



On Thu, Jul 4, 2013 at 2:20 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Pavel Vazharov <pvazharov at ...> writes:
>
> > ./configure
>
> A few unrelated comments (your explanations may
> help improving the configure script):
>
> > --arch=x86
> > --target-os=qnx
>
> Is this really needed?
>
> > --enable-static
> > --disable-shared
>
> This is the default (unneeded).
>
> > --disable-everything
> > --disable-programs
> > --disable-postproc
> > --disable-vdpau
>
> You may want to use --disable-all
>
> > --disable-ffplay
> > --disable-ffprobe
> > --disable-ffserver
>
> Does --disable-programs not work?
>
> > --disable-protocols
>
> Does --disable-everything not work?
>
> > --disable-dxva2
> > --disable-mipsfpu
> > --disable-altivec
> > --disable-vda
>
> These look useless.
>
> > --disable-yasm
> > --disable-mmxext
> > --disable-inline-asm
>
> Since you also used --disable-debug I
> have to ask if you try to produce a
> useless library (no debug information,
> but no optimizations either)?
> If you have a good reason, --disable-asm
> is probably simpler.
>
> > The library builds fine but the problem is that when
> > I try to link again libavcodec.a in my application I
> > get undefined references for symbols
>
> What does git log say about the version you are testing?
>
> Carl Eugen
>
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