https://sourceware.org/bugzilla/show_bug.cgi?id=18886
Bug ID: 18886
Summary: Unnecessary PLT entry for IFUNC function from DSO
Product: binutils
Version: 2.26 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: hjl.tools at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
[hjl@gnu-6 tmp]$ cat x.s
.text
.globl foo
.type foo, @function
foo:
jmp *strcmp@GOTPCREL(%rip)
[hjl@gnu-6 tmp]$ gcc -c x.s
[hjl@gnu-6 tmp]$ ld.gold -shared x.o
[hjl@gnu-6 tmp]$ objdump -dwr a.out
a.out: file format elf64-x86-64
Disassembly of section .text:
0000000000000220 <foo>:
220: ff 25 f2 10 00 00 jmpq *0x10f2(%rip) # 1318
<_DYNAMIC+0xf0>
[hjl@gnu-6 tmp]$ ld.gold -shared x.o -lc -L/usr/lib64
[hjl@gnu-6 tmp]$ objdump -dwr a.out
a.out: file format elf64-x86-64
Disassembly of section .plt:
00000000000002a0 <strcmp@plt-0x10>:
2a0: ff 35 f2 11 00 00 pushq 0x11f2(%rip) # 1498
<_GLOBAL_OFFSET_TABLE_+0x8>
2a6: ff 25 f4 11 00 00 jmpq *0x11f4(%rip) # 14a0
<_GLOBAL_OFFSET_TABLE_+0x10>
2ac: 90 nop
2ad: 90 nop
2ae: 90 nop
2af: 90 nop
00000000000002b0 <strcmp@plt>:
2b0: ff 25 f2 11 00 00 jmpq *0x11f2(%rip) # 14a8
<_GLOBAL_OFFSET_TABLE_+0x18>
2b6: 68 00 00 00 00 pushq $0x0
2bb: e9 e0 ff ff ff jmpq 2a0 <strcmp@plt-0x10>
Disassembly of section .text:
00000000000002c0 <foo>:
2c0: ff 25 c2 11 00 00 jmpq *0x11c2(%rip) # 1488
<_DYNAMIC+0x180>
[hjl@gnu-6 tmp]$
Gold shouldn't add strcmp to PLT because strcmp is IFUNC in libc.so.6.
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