llvm dev - Apr 2021 - lld suspect behavior .group/rela/text input sections

Hi
Can you help me to understand if I’m doing anything wrong or the problem is with
lld?
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.

Some of the modules that I build are very big and also have .group sections on
rela.text.<mangledname> and .text.<mangledname>

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)

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.

Linker-script:
https://github.com/freebsd/freebsd-src/blob/098dbd7ff7f3da9dda03802cdb2d8755f816eada/sys/conf/ldscript.amd64
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On Wed, Apr 28, 2021 at 11:02 AM Moshtaghi, Alireza via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Hi
>
> Can you help me to understand if I’m doing anything wrong or the problem is
with lld?
>
> 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.
>
>
>
> Some of the modules that I build are very big and also have .group sections
on rela.text.<mangledname> and .text.<mangledname>
>
>
>
> 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)
>
>
>
> 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 ;-)
>
>
> Linker-script:
>
>
https://github.com/freebsd/freebsd-src/blob/098dbd7ff7f3da9dda03802cdb2d8755f816eada/sys/conf/ldscript.amd64