[Bug gold/18780] New: Gold does not support long PLT on ARM

[eugeni.stepanov at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18780

            Bug ID: 18780
           Summary: Gold does not support long PLT on ARM
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: eugeni.stepanov at gmail dot com
                CC: ian at airs dot com
  Target Milestone: ---

The BFD linker has a -long-plt option to generate 16-byte PLT entries that are
capable of addressing GOT at arbitrary offset. Gold only knows how to emit
12-byte PLT entries which limits the linked binary to 0xFFFFFFF (256MB) offset
between PLT and GOT.

Linking a larger binary results in the following error (at HEAD):
ld.gold: internal error in do_fill_plt_entry, at arm.cc:7799

In case the code moves later, this refers to the following lines in
do_fill_plt_entry:

  int32_t offset = ((got_address + got_offset)
                    - (plt_address + plt_offset + 8));

  gold_assert(offset >= 0 && offset < 0x0fffffff);

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