Re: [PATCH] RISC-V: Add generic tune as default.

[Kito Cheng]

> @@ -78,6 +79,7 @@ RISCV_CORE("sifive-e31",      "rv32imac",   
> "sifive-3-series")
>  RISCV_CORE("sifive-e34",      "rv32imafc",  "sifive-3-series")
>  RISCV_CORE("sifive-e76",      "rv32imafc",  "sifive-7-series")
>
> +RISCV_CORE("generic",         "rv64gc",    "generic")

^^^ Drop this and add -mtune=generic only since I guess we don't have
consensus for what arch string for the -mcpu=generic yet