Deprecated declarations

[Antonio]

Hello.

xpra/codecs/dec_avcodec2/decoder.c is not compiled for a "deprecated declaration" error:

building 'xpra.codecs.dec_avcodec2.decoder' extension
creating build/temp.linux-x86_64-2.7/xpra/codecs/dec_avcodec2
gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -mcet -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -mcet -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -mcet -fcf-protection -fPIC -I/usr/include/ffmpeg -I/usr/include/python2.7 -c xpra/codecs/dec_avcodec2/decoder.c -o build/temp.linux-x86_64-2.7/xpra/codecs/dec_avcodec2/decoder.o -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -Wall -Werror -fPIC
xpra/codecs/dec_avcodec2/decoder.c: In function '__pyx_pf_4xpra_6codecs_12dec_avcodec2_7decoder_7Decoder_init_context':
xpra/codecs/dec_avcodec2/decoder.c:5218:3: error: 'avcodec_register_all' is deprecated [-Werror=deprecated-declarations]
   avcodec_register_all();
   ^~~~~~~~~~~~~~~~~~~~
In file included from xpra/codecs/dec_avcodec2/decoder.c:579:
/usr/include/ffmpeg/libavcodec/avcodec.h:4044:6: note: declared here
 void avcodec_register_all(void);
      ^~~~~~~~~~~~~~~~~~~~
xpra/codecs/dec_avcodec2/decoder.c: In function 'initdecoder':
xpra/codecs/dec_avcodec2/decoder.c:13996:3: error: 'avcodec_register_all' is deprecated [-Werror=deprecated-declarations]
   avcodec_register_all();
   ^~~~~~~~~~~~~~~~~~~~
In file included from xpra/codecs/dec_avcodec2/decoder.c:579:
/usr/include/ffmpeg/libavcodec/avcodec.h:4044:6: note: declared here
 void avcodec_register_all(void);
      ^~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
error: command 'gcc' failed with exit status 1

xpra-2.2.4
ffmpeg-3.5
gcc-8.0.1

[Antoine Martin]

As far as I can tell, there is no replacement for this function.
We'll deal with it when ffmpeg 4.0 comes out, hopefully they will have fixed their own code and provided an alternative by then.
Until then, you can silence the warnings with --without-strict.

[Antoine Martin]

Fixes:

• r19035 + r19040: "avcodec2" decoder fixed - the function should no longer be called
• r19036: "ffmpeg" encoder now requires ffmpeg 4+ - not backported, this encoder should not be used anyway (blocked by #1463)

For platform packaging of ffmpeg 4, see r19039 and #1751