gcc/testsuite/gcc.target/riscv/arch-10.c

/* { dg-do compile } */
/* { dg-options "-O2 -march=rv32gf2 -mabi=ilp32" } */
int foo()
{
}
/* { dg-error "Extension `f' appear more than one time." "" { target *-*-* } 0 } */