[Bug gold/18886] Unnecessary PLT entry for IFUNC function from DSO

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18886

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Gold generates 2 relocations against strcmp and ld generates one:

address@hidden pr18886]$ cat foo.S
        .text
        .globl foo      
        .type   foo, @function
foo:
        jmp     address@hidden(%rip)
address@hidden pr18886]$ make
gcc -B./ -g -Wall -c -o foo.o foo.S
ld.gold  -shared -o libfoo.so foo.o -lc -L/usr/lib64
readelf -r libfoo.so

Relocation section '.rela.dyn' at offset 0x270 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000001488  000200000006 R_X86_64_GLOB_DAT 0000000000000000
address@hidden + 0

Relocation section '.rela.plt' at offset 0x288 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
0000000014a8  000200000007 R_X86_64_JUMP_SLO 0000000000000000
address@hidden + 0
address@hidden pr18886]$ ld.bfd  -shared -o libfoo.so foo.o -lc -L/usr/lib64
address@hidden pr18886]$ readelf -r libfoo.so

Relocation section '.rela.dyn' at offset 0x228 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000200368  000300000006 R_X86_64_GLOB_DAT 0000000000000000
address@hidden + 0
address@hidden pr18886]$

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