Bug#911022: flann breaks hugin autopkgtest: undefined symbol: LZ4_resetStreamHC

[Jochen Sprickerhof]

* Andreas Metzler <ametzler at bebt.de> [2018-10-15 17:23]:
>I guess flann not only exposes lz4 in its header but also flann-using
>packages directly call lz4-functions when using flann functions. Which
>would explain why transitive linking to lz4 via fall is not enough.
>(Hugin FTBFS).

Yes, plus Hugin set's -as-needed and as it doesn't use any symbols from 
flann_cpp, it strips it, loosing the lz4 symbols as well.

>Anyway, this change seems to be a ABI break for flann, I guess it will
>need to add a
>Breaks: hugin (<< fixed-version~)

I don't think that's needed, flann_cpp links lz4 (as-needed tricked me 
as well, -6 should be fine), so the Hugin binaries in unstable still 
work.

Cheers Jochen
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