[llvm-dev] lld suspect behavior .group/rela/text input sections

[Fāng-ruì Sòng via llvm-dev]

On Wed, Apr 28, 2021 at 11:02 AM Moshtaghi, Alireza via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
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> Hi
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> Can you help me to understand if I’m doing anything wrong or the problem is with lld?
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> I need to use linker-script (below link) for linking freebsd kernel modules and pass -r to ld.lld (version 10) to make these modules relocatable.
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> Some of the modules that I build are very big and also have .group sections on rela.text.<mangledname> and .text.<mangledname>
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> Per ELF specification these sections should be treated as one and either all merged or none. But I think lld is not respecting that spec and merges all .text.<mangledname> sections while leaving the .group and .rela.text.<mangledname> sections in the output, which results in broken elf (when I try to load it into gdb, I get Bad Value error)
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> Alternatively, when I link with ld.bfd, the .text.<manglenames> remain in the output and I’m able to load the object into gdb without error.

Hi, do you have a minimal reproducible example
(https://stackoverflow.com/help/minimal-reproducible-example)?

Freebsd is not build-friendly when the user is not using FreeBSD ;-)

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> Linker-script:
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> https://github.com/freebsd/freebsd-src/blob/098dbd7ff7f3da9dda03802cdb2d8755f816eada/sys/conf/ldscript.amd64