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Fangrui Song
6fcac4f990
[MC] Set sh_link to 0 if the associated symbol is undefined
Part of https://bugs.llvm.org/show_bug.cgi?id=41734 LTO can drop externally available definitions. Such AssociatedSymbol is not associated with a symbol. ELFWriter::writeSection() will assert. Allow a SHF_LINK_ORDER section to have sh_link=0. We need to give sh_link a syntax, a literal zero in the linked-to symbol position, e.g. `.section name,"ao",@progbits,0` Reviewed By: pcc Differential Revision: https://reviews.llvm.org/D72899
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