errno in dragonflybsd

gistfile1.txt

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

% gcc -c -Wall  -Wextra -pedantic t.c
t.c:2: warning: return type defaults to 'int'
% objdump -h t.o                     

t.o:     file format elf64-x86-64

Sections:
Idx Name          Size      VMA               LMA               File off  Algn
  0 .text         00000027  0000000000000000  0000000000000000  00000040  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000000  0000000000000000  0000000000000000  00000068  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00000000  0000000000000000  0000000000000000  00000068  2**2
                  ALLOC
  3 .comment      00000023  0000000000000000  0000000000000000  00000068  2**0
                  CONTENTS, READONLY
  4 .eh_frame     00000050  0000000000000000  0000000000000000  00000090  2**3
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
% 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