[llvm-dev] LLD: question about debug_info relocs with emit-relocs + gc-sections.

[Fāng-ruì Sòng via llvm-dev]

Thanks for the report! The bug can be generalized to all non-SHF_ALLOC
SHT_REL[A] (due to --emit-relocs) and SHF_LINK_ORDER.

https://reviews.llvm.org/D89841 will fix it.

On Tue, Oct 20, 2020 at 5:35 PM David Blaikie <dblaikie at gmail.com> wrote:
>
> +Fangrui Song
>
> Yeah, that sounds like a bug to me.
>
> On Tue, Oct 20, 2020 at 5:25 PM Alexander Yermolovich via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>
>> Hello.
>>
>> I have been looking in to what relocs are emitted when --emit-relcos and --gc-sections flags are set.
>> Seems like relocs sections for .debug_* are not emitted.
>> Looking into it the debug sections are marked live in MarkLive.cpp:MarkLive on first pass through all the inputSections, but their dependendSections are not marked as live.
>> It then goes to rest of the algorithm that handles some special sections, but mainly deals with sections based on defined symbols in symtab.
>>
>> As the result when -gc-sections flag is set relocations for debug_* would not be in output. Is that intentional, or oversight?
>>
>> Thank You
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