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[Bug ld/25236] common symbol: don't consider definitions in shared objec

From: i at maskray dot me
Subject: [Bug ld/25236] common symbol: don't consider definitions in shared objects
Date: Fri, 06 Dec 2019 09:07:16 +0000


--- Comment #3 from Fangrui Song <i at maskray dot me> ---
Maybe we should discuss on the generic ABI mailing list. It is very late here
(01:00) so I'll not do that now. If you create a thread, can you CC me?

My feeling is that a STN_COMMON (STT_COMMON) definition in a shared object
should be treated as a regular definition, not a common symbol. It is subject
to copy relocations. Only STN_COMMON (STT_COMMON) from object files are
assigned st_size comparing semantics.

If we choose the interpretation that the common definition from a shared object
wins, it will break the rule that object file definitions beat shared

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