[PATCH v3] RISC-V: re-enable gcc + rust builds

[Asuna]

Hi everyone. Sorry I was inactive on this patch for a while. I'm getting 
back into this work.

On 9/19/25 1:20 PM, Vivian Wang wrote:
> I think instead of testing libclang version, it would make more sense to
> feature test if bindgen the binary supports these flags, like what we
> already do with $(cc-option,...).
>
> Same for all the other version tests.

Conor, since you've reviewed the v3 patch, do you think Vivian's 
suggestion is a better solution? If so, I can start trying to make a v4 
patch towards that path in the next few days.


On 9/19/25 1:20 PM, Vivian Wang wrote:
>> [...]
>>   
>> +config TOOLCHAIN_MATCHES_ZICSR_ZIFENCEI
> TOOLCHAIN_ACCEPTS_ZICSR_ZIFENCEI?

The word "accepts" is not very clear to me, as this option may also be 
YES when the toolchain does not recognize Zicsr/Zifencei in 
-march. Zicsr/Zifencei are always enabled, this option actually detects 
if the same flags related to Zicsr/Zifencei (-march=_zicsr_zifencei or 
-misa-spec=2.2) can be recognized in multiple toolchains at the same 
time without causing any errors.