llvm/clang/test/Sema/attr-target-mv-bad-target.c

// RUN: %clang_cc1 -triple arm-none-eabi  -fsyntax-only -verify %s

int __attribute__((target("sse4.2"))) redecl1(void) { return 1; }
//expected-error@+2 {{function multiversioning is not supported on the current target}}
//expected-note@-2 {{previous declaration is here}}
int __attribute__((target("avx")))  redecl1(void) { return 2; }

//expected-error@+1 {{function multiversioning is not supported on the current target}}
int __attribute__((target("default"))) with_def(void) { return 1;}