Is there a good description of ELF shared library symbol versioning best
practices somewhere?
In particular, under what conditions do you need to create a new section in
the versioning file given to the linker's --version-script option when new
symbols are added?
And what do you do if you've done it wrong?
For example, in libkeyutils, I added a couple of symbols to KEYUTILS_1.4 when
I should perhaps have created KEYUTILS_1.5 and added them there:
http://git.kernel.org/cgit/linux/kernel/git/dhowells/keyutils.git/commit/?id=49249ce7d84a967fcdc06fbe6bf1d0cf89ac5215
I have been given a patch to move these symbols to KEYUTILS_1.5, but checking
the keyctl program with "readelf -s", I see:
47: 0000000000000000 0 FUNC GLOBAL DEFAULT UND
recursive_session_key_sca@KEYUTILS_1.4 (7)
so I would guess applying this patch would break anything that uses this.
I assumed that adding them to KEYUTILS_1.4 would be okay because nothing
would've tried to use them previously because they didn't exist in any
version.
David
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