Will the new GTSAM 4.3 be binary compatible with earlier versions of GTSAM 4.x? about gtsam HOT 3 CLOSED

Are you referring to the API? I believe deprecated APIs should still be available, ABI-wise I don't know.

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I was referring to ABI. If we break ABI then we'll have to bump the major version number at the package level. Here is a tool that apparently can be used to check if the ABI changes between revisions.
https://lvc.github.io/abi-compliance-checker/
At the moment GTSAM is not officially distributed with Ubuntu but through a personal package archive PPA. So we'll simply ask people to uninstall the old version and install the new version of GTSAM. Once GTSAM becomes an official Debian/Ubuntu package, this will no longer be possible: gtsam 4.3 would have to be binary compatible with gtsam 4.2.
Just wanted to bring awareness to this aspect. I will let this issue simmer for a little longer and then close it.

from gtsam.

OK, closing this issue since it is not on the radar screen until GTSAM will be released as a proper Ubuntu package.

from gtsam.