Re: libupb.a needed by anything using protobuf .cmake files

"Xi Ruoyao" ([email protected] via blfs-dev Mailing List) <[email protected]>
Newsgroups gmane.linux.lfs.beyond.devel
Message-ID <[email protected]>
On Fri, 2025-05-23 at 23:20 +0200, Pierre Labastie wrote:
> /usr/lib/cmake/protobuf/protobuf-targets.cmake contains:
> -----
> add_library(protobuf::libupb STATIC IMPORTED)
> -----
> So if we remove libupb.a as done in protobuf instructions (since
> protobuf-31), any CMakeLists.txt using this file will fail with:
> ----------
> CMake Error at /usr/lib/cmake/protobuf/protobuf-targets.cmake:132
> (message):
>   The imported target "protobuf::libupb" references the file
> 
>      "/usr/lib/libupb.a"
> 
>   but this file does not exist.  Possible reasons include:
> 
>   * The file was deleted, renamed, or moved to another location.
> 
>   * An install or uninstall procedure did not complete successfully.
> 
>   * The installation package was faulty and contained
> 
>      "/usr/lib/cmake/protobuf/protobuf-targets.cmake"
> 
>   but not all the files it references.
> -----------
> So I think we should remove the line "rm /usr/lib/libupb.a" when
> installing protobuf. libupb.a is about 520KB in size...

The problem here is not to save space.  It's just it shouldn't be
installed even per upstream documentation
(https://github.com/protocolbuffers/protobuf/blob/main/upb/README.md):

   While upb offers a C API, the C API & ABI are not stable. For this
   reason, upb is not generally offered as a C library for direct
   consumption, and there are no releases.

I'll try to figure out a way to prevent it from being installed.

-- 
Xi Ruoyao <[email protected]>
School of Aerospace Science and Technology, Xidian University

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