dragonflybsd v.s. linux - errno access.

gistfile1.txt

aycan: ~$ uname -sm
Linux x86_64

aycan: ~$ cat t.c
#include <errno.h>
f() { return errno; }

aycan: ~$ gcc -c t.c -o t.o

aycan: ~$ objdump -r t.o

t.o:     file format elf64-x86-64

RELOCATION RECORDS FOR [.text]:
OFFSET           TYPE              VALUE 
0000000000000005 R_X86_64_PC32     __errno_location-0x0000000000000004


RELOCATION RECORDS FOR [.eh_frame]:
OFFSET           TYPE              VALUE 
0000000000000020 R_X86_64_PC32     .text



***************************

% uname -sm
DragonFly x86_64

% cat t.c            
#include <errno.h>
f() { return errno; }

% gcc -c t.c -o t.o

% objdump -r t.o   

t.o:     file format elf64-x86-64

RELOCATION RECORDS FOR [.text]:
OFFSET           TYPE              VALUE 
0000000000000010 R_X86_64_GOTTPOFF  errno+0xfffffffffffffffc


RELOCATION RECORDS FOR [.eh_frame]:
OFFSET           TYPE              VALUE 
0000000000000020 R_X86_64_PC32     .text
000000000000003c R_X86_64_PC32     .text+0x000000000000001a