gcc/testsuite/gcc.target/riscv/arch-9.c

/* { dg-do compile } */
/* { dg-options "-O2 -march=rv32g2 -mabi=ilp32" } */
int foo()
{
}
/* { dg-warning "version of `g` will be omitted, please specify version for individual extension." "" { target *-*-* } 0 } */