https://sourceware.org/bugzilla/show_bug.cgi?id=33260
--- Comment #5 from Thiago Macieira <thiago at kde dot org> ---
With the patch, without the -z option:
$ objdump -R a.so
a.so: file format elf64-x86-64
DYNAMIC RELOCATION RECORDS
OFFSET TYPE VALUE
0000000000003de8 R_X86_64_RELATIVE *ABS*+0x0000000000001120
0000000000003df0 R_X86_64_RELATIVE *ABS*+0x00000000000010e0
0000000000004010 R_X86_64_RELATIVE *ABS*+0x0000000000004010
0000000000004020 R_X86_64_RELATIVE *ABS*+0x0000000000001140
0000000000003fc8 R_X86_64_GLOB_DAT _ITM_deregisterTMCloneTable@Base
0000000000003fd0 R_X86_64_GLOB_DAT __gmon_start__@Base
0000000000003fd8 R_X86_64_GLOB_DAT _ITM_registerTMCloneTable@Base
0000000000003fe0 R_X86_64_GLOB_DAT __cxa_finalize@GLIBC_2.2.5
0000000000004028 R_X86_64_64 my_func_overridable@@Base
0000000000004000 R_X86_64_JUMP_SLOT my_func_overridable@@Base
$ objdump -d a.so | sed -n '/<f>/,/^$/p'
0000000000001150 <f>:
1150: 48 83 ec 08 sub $0x8,%rsp
1154: e8 e7 ff ff ff call 1140 <my_func>
1159: e8 d2 fe ff ff call 1030 <my_func_overridable@plt>
115e: 48 8d 05 bb 2e 00 00 lea 0x2ebb(%rip),%rax # 4020
<vtable>
1165: 48 83 c4 08 add $0x8,%rsp
1169: c3 ret
$ readelf -j .data a.so
Hex dump of section '.data':
0x00004010 10400000 00000000 00000000 00000000 .@..............
0x00004020 40110000 00000000 00000000 00000000 @...............
$ readelf -n a.so
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000030 NT_GNU_PROPERTY_TYPE_0
Properties: 1_needed: indirect external access
x86 feature used: x86
x86 ISA used: x86-64-baseline
Everything looks fine:
* the call to <my_func> is PC-relative, no relocation
* the call to <my_func_overridable> (added to b.c) goes through the PLT
* the vtable[] array has two relocations:
* an R_X86_64_RELATIVE for 0x0000000000001140 (<my_func>)
* an R_X86_64_64 for <my_func_overridable>
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