In this testcase, .got.plt section isn't needed:
[...@gnu-6 gotplt-1]$ cat foo.c
static int bar ()
{
return 0x1234;
}
void *
foo ()
{
return &bar;
}
[...@gnu-6 gotplt-1]$ cat main.c
extern void * foo ();
extern void abort ();
int
main ()
{
int (*bar) () = foo ();
if (bar () != 0x1234)
abort ();
return 0;
}
[...@gnu-6 gotplt-1]$ make LD=ld
gcc -m32 -O2 -fPIC -c -o foo.o foo.c
ld -shared -m elf_i386 -o foo.so foo.o
gcc -m32 -O2 -c -o main.o main.c
gcc -m32 -o foo foo.so main.o -Wl,-rpath,.
./foo
[...@gnu-6 gotplt-1]$ readelf -r foo.o
Relocation section '.rel.text' at offset 0x3f4 contains 3 entries:
Offset Info Type Sym.Value Sym. Name
00000011 00000b02 R_386_PC32 00000000 __i686.get_pc_thunk.cx
00000017 00000c0a R_386_GOTPC 00000000 _GLOBAL_OFFSET_TABLE_
00000021 00000209 R_386_GOTOFF 00000000 .text
[...@gnu-6 gotplt-1]$ readelf -S foo.so
There are 11 section headers, starting at offset 0x260:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .hash HASH 000000b4 0000b4 000028 04 A 2 0 4
[ 2] .dynsym DYNSYM 000000dc 0000dc 000050 10 A 3 1 4
[ 3] .dynstr STRTAB 0000012c 00012c 00001d 00 A 0 0 1
[ 4] .text PROGBITS 00000150 000150 00002a 00 AX 0 0 16
[ 5] .dynamic DYNAMIC 0000117c 00017c 000058 08 WA 3 0 4
[ 6] .got.plt PROGBITS 000011d4 0001d4 00000c 04 WA 0 0 4
[ 7] .comment PROGBITS 00000000 0001e0 00002d 01 MS 0 0 1
[ 8] .shstrtab STRTAB 00000000 00020d 000052 00 0 0 1
[ 9] .symtab SYMTAB 00000000 000418 000110 10 10 13 4
[10] .strtab STRTAB 00000000 000528 00005d 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
[...@gnu-6 gotplt-1]$
--
Summary: Unused .got.plt section generated by linker
Product: binutils
Version: 2.21 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: hjl dot tools at gmail dot com
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=11812
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