https://twitter.com/ytomino/status/562954219431661569 の実験

extinl.c

extern inline int extinl (int x) {return x;}
       inline int norinl (int x) {return x;}
static inline int stainl (int x) {return x;}

extern void dummy(int x);

void test(void)
{
  dummy(extinl(1));
  dummy(norinl(1));
  dummy(stainl(1));
}

/* ==== gcc 4.9 ====

% gcc -c extinl.c && nm extinl.o
0000000000000058 s EH_frame1
                 U _dummy
                 U _extinl
0000000000000000 T _norinl
000000000000000c t _stainl
0000000000000018 T _test

% gcc -c -std=c99 extinl.c && nm extinl.o
0000000000000058 s EH_frame1
                 U _dummy
0000000000000000 T _extinl
                 U _norinl
000000000000000c t _stainl
0000000000000018 T _test

% gcc -c -O extinl.c && nm extinl.o
0000000000000030 s EH_frame1
                 U _dummy
0000000000000000 T _norinl
0000000000000003 T _test

% gcc -c -O -std=gnu99 extinl.c && nm extinl.o
0000000000000030 s EH_frame1
                 U _dummy
0000000000000000 T _extinl
0000000000000003 T _test
*/

/* ==== gcc 4.2 ====

% gcc -c extinl.c && nm extinl.o               
0000000000000058 s EH_frame1
                 U _dummy
                 U _extinl
0000000000000000 T _norinl
0000000000000070 S _norinl.eh
0000000000000045 t _stainl
00000000000000d0 s _stainl.eh
000000000000000c T _test
00000000000000a0 S _test.eh

% gcc -c -std=c99 extinl.c && nm extinl.o   
0000000000000058 s EH_frame1
                 U _dummy
0000000000000000 T _extinl
0000000000000070 S _extinl.eh
                 U _norinl
0000000000000045 t _stainl
00000000000000d0 s _stainl.eh
000000000000000c T _test
00000000000000a0 S _test.eh

% gcc -c -O extinl.c && nm extinl.o
0000000000000030 s EH_frame1
                 U _dummy
0000000000000000 T _norinl
0000000000000048 S _norinl.eh
0000000000000008 T _test
0000000000000078 S _test.eh

% gcc -c -O -std=c99 extinl.c && nm extinl.o
0000000000000030 s EH_frame1
                 U _dummy
0000000000000000 T _extinl
0000000000000048 S _extinl.eh
0000000000000008 T _test
0000000000000078 S _test.eh

*/