Linker error: multiple definition of `typeinfo name for g2o::BaseVertex<7, g2o::Sim3>';

[dkogan]

Hello. This is the inverse of #444. I just pushed g2o to Debian. On armhf there's a build error:

https://buildd.debian.org/status/fetch.php?pkg=g2o&arch=armhf&ver=0%7E20230806-1&stamp=1696268512&raw=0

Look at the end. Removing the fix for #444 makes the build complete, at least on armhf. Do you have a clear understanding of #444, and what this failure means? Should the template be explicitly instantiated, or not?

Thanks

[wangzheqie]

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[RainerKuemmerle]

@dkogan Do you know if removing this line would work on other architectures?

Back then I thought it passes in general but avoids an issue on MSVC. But MSVC is somewhat not so clear to me and we already have a few #ifdef MSC_VER in the code.

[dkogan]

I currently have a distro-patch to remove that line, and here's what the build results are: https://buildd.debian.org/status/package.php?p=g2o

The i386 and arch=all failures are unrelated. So I would say that as far as Debian is concerned, removing that line is the right thing to do.