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

[Asuna Yang]

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.

Best regards,
Asuna