[FFmpeg-devel] duplicate symbol '_dec_init' in: fftools/ffmpeg_dec.o

[Christopher Degawa]

On Sat, Mar 16, 2024 at 09:08 Gnattu OC via ffmpeg-devel <
ffmpeg-devel at ffmpeg.org> wrote:

> If you are using Xcode >= 15 then you will need to add `-Wl,-ld_classic`
> to LDFLAGS.  During configure you will also need to set
> `--host-ldflags='-Wl,-ld_classic’`.
>
> > On Mar 16, 2024, at 09:04, Helmut K. C. Tessarek <tessarek at evermeet.cx>
> wrote:
> >
> > Hello,
> >
> > It's me again - the dude who compiles ffmpeg for macOS... ;-)
> >
> > I haven't updated the referenced libbluray, but only compiled ffmpeg the
> way I always do. The last time was about 3 days ago and all was good.
> >
> > This is the git hash of ffmpeg I tried to compile: b47abd5737
> >
> > duplicate symbol '_dec_init' in:
> >    fftools/ffmpeg_dec.o
> >    /Users/Shared/ffmpeg/sw/lib/libbluray.a(libbluray_la-dec.o)
> > ld: 1 duplicate symbol for architecture x86_64
> > clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> >
> > The only code that changed was ffmpeg and libx265, thus I suspect it was
> a change to ffmpeg. I can't really do a git bisect, because this error only
> happens after ffmpeg is compiled at the linker stage, so that would take me
> forever....
> >
> > However, the dev who did a change related to this would probably know
> right away.
> >
> > Cheers,
> >  K. C.
> >
> >
> > --
> > regards Helmut K. C. Tessarek              KeyID 0x172380A011EF4944
> > Key fingerprint = 8A55 70C1 BD85 D34E ADBC 386C 1723 80A0 11EF 4944
> >
> > /*
> >   Thou shalt not follow the NULL pointer for chaos and madness
> >   await thee at its end.
> > */
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> >
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Seems the conflict comes from
https://code.videolan.org/videolan/libbluray/-/blob/master/src/libbluray/disc/dec.c?ref_type=heads#L287
 and
https://github.com/FFmpeg/FFmpeg/commit/c4de5778bceab3c15f1239f1f16816749a7fd3b6

Perhaps you could also try asking libbluray if they could use an internal
prefix. Otherwise you might need to do a rename of that function on
ffmpeg's side.