gcc/testsuite/gcc.target/i386/mvc3.c

/* { dg-do compile } */
/* { dg-require-ifunc "" } */

__attribute__((target_clones("avx","arch=slm","arch=core-avx2")))
int foo (); /* { dg-error "'default' target was not set" } */

int
bar ()
{
  return foo();
}