gcc-4.9/gcc/testsuite/gcc.target/i386/ret-thunk-5.c

/* { dg-do compile } */
/* { dg-options "-O2 -mfunction-return=keep" } */

extern void foo (void) __attribute__ ((function_return("thunk")));

void
foo (void)
{
}

/* { dg-final { scan-assembler "jmp\[ \t\]*__x86.return_thunk" } } */
/* { dg-final { scan-assembler "jmp\[ \t\]*\.LIND" } } */
/* { dg-final { scan-assembler "call\[ \t\]*\.LIND" } } */
/* { dg-final { scan-assembler {\tlfence} } } */