[PATCH v6 4/4] RISC-V: handle extension configs for bindgen, re-enable gcc + rust builds

[Charalampos Mitrodimas]

Asuna Yang <xinrui.riscv at isrc.iscas.ac.cn> writes:

> On 1/29/26 21:49, Charalampos Mitrodimas wrote:
>
>> I'm under the impression that the `!RUST ||` guard here doesn't
>> actually prevent the `$(bindgen-backend-option,...)` call from being
>> executed. `$(...)` shell expansions should happen during the textual
>> substitution phase, before symbol dependency evaluation occurs, check
>> documentation at kconfig-macro-language.rst lines 228-229.
>
> I suppose this is unavoidable if we decide to probe options rather
> than rely on version numbers.
>
> Similar issue also occurs in `cc-option`, for example:
>
> 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv)
> 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv)
>
> For 64-bit builds, `-march=rv32imv` will still be probed; for 32-bit
> builds, `-march=rv64imv` will still be probed.
>
> I agree with Nathan that this trivial waste is worth it for the sake
> of simplicity.

Understood. Seems not worth it at all.

>
> Best regards,
> Asuna