[Debian-med-packaging] Bug#978471: waybar fails to launch

[Shengjing Zhu]

Hi,

On Tue, Dec 29, 2020 at 07:10:23PM +0100, Sebastian Ramacher wrote:
> On 2020-12-29 22:01:15, Andrey Rahmatullin wrote:
> > Control: reassign -1 libspdlog1/1:1.8.1+ds-2+b1
> > Control: affects -1 waybar
> > Control: severity -1 serious
> > Control: retitle -1 libspdlog1 breaks ABI on rebuilds with different libfmt
> > 
> > On Sun, Dec 27, 2020 at 09:26:09PM +0100, Michele Cane wrote:
> > > waybar: symbol lookup error: waybar: undefined symbol: _ZN6spdlog7details7log_msgC1ENS_10source_locEN3fmt2v617basic_string_viewIcEENS_5level10level_enumES6_
> > This is because libspdlog1 was rebuilt with newer libfmt and this caused
> > symbol renames.
> > 
> > #977454 says "The code is actually working with the new version, only the
> > symbols file is wrong here. spdlog uses fmtlib internal API and exposes it
> > through the symbols files. This looks wrong to me, as every new fmtlib
> > will cause spdlog ftbfs due to the symbols file.". If it's about the same
> > problem then it looks like it failed to mention that symbol changes cause
> > much worse problems than just needing to update the symbols file.
> 
> The situtation is somewhat similar to liboost-regex and libicu.
> libboost-regex exports symbols that depend on libicu's ABI and change
> whenever liboost-regex is rebuilt against a version of libicu with a
> different ABI.
> 
> For spdlog this can be solved in the same way as for boost.
> liboost-regexX.Y provides libboost-regexX.Y-icuZ when built against
> libicuZ. Reverse dependencies then depend on libboost-regexX.Y-icuZ. See
> 
> https://salsa.debian.org/debian/boost/-/blob/master/debian/rules#L53
> https://salsa.debian.org/debian/boost/-/blob/master/debian/rules#L289
> https://salsa.debian.org/debian/boost/-/blob/master/debian/rules#L338
> 
> Cheers
> -- 
> Sebastian Ramacher

Follow Sebastian's advice, please see the following patch.
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