Implementing symbol versioning in shared libraries

[jforissier]

During the review of #5688 the question came up of implementing symbol versioning in user space shared libraries (especially libutee). I am opening this issue for reference only, to share a quick investigation I've done: https://docs.google.com/document/d/1qvN4WIIcmk3MGWdpdB3-hpg3oOErI7tgYbfGx9VR6FA.

In case anyone feels like doing the ldelf part, feel free 😉

[jenswi-linaro]

Thanks for the investigation. Sounds like a fun little project if you can afford the time.

[etienne-lms]

thanks @jforissier for the details.

[jforissier]

Closing because #5833 has all the information and some code.