On Wed, Feb 23, 2022 at 04:29:43PM +0200, Martin Storsjö wrote:
> This avoids including version.h in all source files, avoiding
> unnecessary rebuilds when the version number is bumped. Only
> version_major.h is included by the main header, which defines
> availability of e.g. FF_API_* macros, and which is bumped much
> less often.
> ---
>  fftools/cmdutils.c             |  1 +
>  fftools/ffmpeg.c               |  1 +
>  fftools/ffprobe.c              |  1 +
>  libavcodec/Makefile            |  1 +
>  libavcodec/aacenc.c            |  1 +
>  libavcodec/avcodec.c           |  1 +
>  libavcodec/avcodec.h           |  2 +-
>  libavcodec/codec.h             |  2 +-
>  libavcodec/dpxenc.c            |  1 +
>  libavcodec/j2kenc.c            |  1 +
>  libavcodec/libvorbisenc.c      |  1 +
>  libavcodec/mjpegenc_common.c   |  1 +
>  libavcodec/mpeg4videoenc.c     |  1 +
>  libavcodec/options_table.h     |  2 +-
>  libavcodec/packet.h            |  2 +-
>  libavcodec/pthread_frame.c     |  2 +-
>  libavcodec/tiffenc.c           |  1 +
>  libavcodec/vaapi_encode_h264.c |  1 +
>  libavcodec/version.h           | 28 ++---------------
>  libavcodec/version_major.h     | 55 ++++++++++++++++++++++++++++++++++
>  libavformat/movenc.c           |  1 +
>  21 files changed, 76 insertions(+), 31 deletions(-)
>  create mode 100644 libavcodec/version_major.h

not sure i missed some patch but this seems not to build

CC	libavcodec/vc2enc.o
libavcodec/vc2enc.c: In function ‘vc2_encode_frame’:
libavcodec/vc2enc.c:957:48: error: ‘LIBAVCODEC_IDENT’ undeclared (first use in this function); did you mean ‘LIBAVUTIL_IDENT’?
     const char *aux_data = bitexact ? "Lavc" : LIBAVCODEC_IDENT;
                                                ^~~~~~~~~~~~~~~~
                                                LIBAVUTIL_IDENT
libavcodec/vc2enc.c:957:48: note: each undeclared identifier is reported only once for each function it appears in
ffbuild/common.mak:78: recipe for target 'libavcodec/vc2enc.o' failed
make: *** [libavcodec/vc2enc.o] Error 1
make: Target 'all' not remade because of errors.

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The misfortune of the wise is better than the prosperity of the fool.
-- Epicurus