[Bug gas/27169] New: i386: Emit R_386_PLT32 instead of R_386_PC32 for `call/jmp foo`

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=27169

            Bug ID: 27169
           Summary: i386: Emit R_386_PLT32 instead of R_386_PC32 for
                    `call/jmp foo`
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

gcc i386 -fno-pic emits `call/jmp foo`, which produces an R_386_PC32
relocation, which is indistinguishable from an address taken operation. If the
symbol turns out to be external, the linker has to employ a tricky called
"canonical PLT entry" (st_shndx=0, st_value!=0), which is similar to a copy
relocation.

If a shared object is linked with -Bsymbolic or --dynamic-list and defines a
function symbol which needs to be interposed by a canonical PLT entry, the
linker could error (the address of the symbol may be different in the shared
object and in the executable).

i386 needs a change similar to
https://sourceware.org/bugzilla/show_bug.cgi?id=22791

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