gcc-4.9/gcc/testsuite/gcc.dg/noncompile/920507-1.c


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/* { dg-options "-ffat-lto-objects" } */
int *
x(void)
{
 register int *a asm("unknown_register");  /* { dg-error "invalid register" } */
 int *v[1] = {a};
 return v[0];
}