I am having two libs A and B. there having the same function same_func, I don't want to modify A's code to remove same_func in A but override the symbol when linking. is there any way to indicate the
function in B lib having a higher priority to be chosen first if symbol conflicted.
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JustWe
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1If proper namespaces were used, the odds of this being an issue are reduced dramatically. – sweenish Mar 12 '21 at 06:22
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"I don't want to..." You should want less to create more hacks than cleaning up messy code. – HAL9000 Mar 12 '21 at 15:36
2 Answers
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The order of the libraries on the command line commonly decides. Put library "B" before library "A".
If your application has a reference to same_func() and you set library "B" as the first one, the linker will resolve it to B's same_func(). Since the reference is resolved now, linking with library "A" will only resolve the references not yet resolved.
the busybee
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A safer solution could be to make all or relevant symbols in libA as 'weak'. You can do this with objcopy using option --weaken. This would make sure that linker chooses definitions from libB if it's available in both A and B. Another solution would be to make use of linker script to include or exclude specific sections from particular objects.
techgreed
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