Re: [PATCH v2] RISC-V: Change -march parsing.

[Kito Cheng <kito dot cheng at gmail dot com>]

Hi Maxim:

LGTM, just need Palmer or Jim to approve :)

Hi Palmer:

>> +static bfd_boolean
>> +riscv_ext_x_valid_p (const char *arg)
>> +{
>> +  if (!strcasecmp (arg, "x"))
>> +    return FALSE;
>> +
>> +  return TRUE;
>
> This allows any X extension through but then goes ahead to not provide any
> support for those extensions.  I can understand providing some scaffolding to
> users to turn on their custom extensions, but we should fail quickly on any
> extensions that aren't supported.

We bypass any X extension now, and one concern is we can't testing any
X parsing/combine logic if we reject that.