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Bug 829691

Summary: sys-apps/portage: soname dependency resolution does not distinguish bundled libraries from real providers ( should not be provided by nvidia-cuda-toolkit)
Product: Portage Development Reporter: Zac Medico <zmedico>
Component: Core - DependenciesAssignee: Portage team <dev-portage>
Status: CONFIRMED ---    
Severity: normal CC: ionen, sam
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: All   
Package list:
Runtime testing required: ---
Bug Depends on:    
Bug Blocks: 694246    

Description Zac Medico gentoo-dev 2021-12-20 01:20:06 UTC
(In reply to Ionen Wolkens from bug 829623 comment #4)
> Personally ran into the following when I wanted to depclean
> nvidia-cuda-toolkit
> $ emerge -pvc nvidia-cuda-toolkit
> Calculating dependencies... done!
>   dev-util/nvidia-cuda-toolkit-11.5.1-r1 pulled in by:
>     app-emulation/wine-staging-6.23 requires x86_64:
>     dev-util/clinfo- requires x86_64:
>     media-video/ffmpeg-4.4.1-r1 requires x86_64:
> libOpenCL is used from opencl-icd-loader, not nvidia-cuda-toolkit which just
> happens to have the same library in /opt
> $ emerge -pvc --ignore-soname-deps=y nvidia-cuda-toolkit
> Calculating dependencies... done!
> >>> Calculating removal order...
> >>> These are the packages that would be unmerged:
>  dev-util/nvidia-cuda-toolkit
>     selected: 11.5.1-r1 
>    protected: none 
>      omitted: none
Comment 1 Ionen Wolkens gentoo-dev 2021-12-20 01:51:00 UTC
To distinguish this in iwdevtools' qa-vdb[1] (used to check missing dependencies by analyzing /var/db/pkg among other things), I've limited to libraries found through /etc/ paths to allow it to give the mostly-right suggestions, i.e. if linking against libOpenCL it'll say to add opencl-icd-loader rather than nvidia-cuda-toolkit

Although being 100% correct and have it fit all setups may be difficult (may also have rpath using a different library with the same name and such)

Comment 2 Ionen Wolkens gentoo-dev 2021-12-20 02:26:48 UTC
(In reply to Ionen Wolkens from comment #1)
> also have rpath using a different library with the same name and such
i.e. could imagine a scenario where path was gotten from pkg-config or something, and it's actually using libOpenCL provided by nvidia-cuda-toolkit and opencl-icd-loader could be depcleaned if nothing else uses it.