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

[Moshtaghi, Alireza via llvm-dev]

I can't send the exact objects, but I'll try to reproduce.

Thanks
A

On 11/16/20, 9:48 AM, "Fāng-ruì Sòng" <maskray at google.com> wrote:

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    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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