[llvm-dev] lld error: output file too large <some large number>

[Fāng-ruì Sòng via llvm-dev]

On Mon, Nov 16, 2020 at 9:05 AM Moshtaghi, Alireza
<Alireza.Moshtaghi at netapp.com> wrote:
>
> My target requires that text section be at 0x0 so "-Ttext 0x0" is passed to the linker.
> When I link with gold, it goes through; but lld fails.
> Instead of always returning the same calculation, when I change the calculation to the following, it links:
>   return first->offset + (os->addr > first->addr ?
>                           os->addr - first->addr :
>                           os->addr);
>
> There are other things in the build that I need to fix so I can't tell if the result is correct yet though. Do you think this is correct?

It is wrong. Can you upload a reproduce file somewhere?
(LLD_REPRODUCE=/tmp/rep.tar ld.lld ....   or ld.lld
--reproduce=/tmp/rep.tar)

> Thanks
> A
>
> On 11/15/20, 11:19 PM, "Fāng-ruì Sòng" <maskray at google.com> wrote:
>
>     NetApp Security WARNING: This is an external email. Do not click links or open attachments unless you recognize the sender and know the content is safe.
>
>
>
>
>     Hi Alireza, getFileAlignment was renamed in Oct 2018. It seems that
>     you may have sectionA and sectionB in one PT_LOAD while sectionB has a
>     lower address. This is invalid.
>
>     Can you provide more information about how you have a sectionB with a
>     lower address? Note that LLD has an error "unable to move location
>     counter backward for: ".
>
>     On Sun, Nov 15, 2020 at 12:20 AM Moshtaghi, Alireza via llvm-dev
>     <llvm-dev at lists.llvm.org> wrote:
>     >
>     > Hi
>     >
>     > I’m having a trouble linking a special program with lld and the above error is generated.
>     >
>     > I narrowed it down to lld/Writer.cpp:getFileAlignment ().
>     >
>     > (Well, my local repository is from a while back (version 10) and for me it is lld/Writer.cpp:computeFileOffset ())
>     >
>     > Either way, where it is calculating the file offset when two sections share same PT_LOAD, the formula used is off2 = off1 + (VA2 – VA1) but the subtraction is causing a negative number, causing out of bound value…
>     >
>     >
>     >
>     > Should this be abs(VA2 – VA1) ?
>     >
>     > Or
>     >
>     > Should it be cast to a signed integer so we subtract the difference rather than adding the large value?
>     >
>     >
>     >
>     > Thanks
>     >
>     > A.
>     >
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>
>
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