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

[Conor Dooley]

On Sun, Sep 14, 2025 at 03:16:40PM +0800, Asuna Yang wrote:
> +config TOOLCHAIN_MATCHES_ZICSR_ZIFENCEI
> +	def_bool y
> +	# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
> +	depends on TOOLCHAIN_NEEDS_OLD_ISA_SPEC || !TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI || RUST_BINDGEN_LIBCLANG_VERSION >= 170000
> +	help
> +	  LLVM/Clang >= 17.0.0 starts recognizing Zicsr/Zifencei in -march, passing
> +	  them to -march doesn't generate an error anymore, and passing them or not
> +	  doesn't have any real difference, it still follows ISA before version
> +	  20190608 - Zicsr/Zifencei are included in base ISA.
> +
> +	  The current latest version of LLVM/Clang still does not require explicit
> +	  Zicsr/Zifencei to enable these two extensions, Clang just accepts them in
> +	  -march and then silently ignores them.

I still don't really like the name of this option, but I don't really
have any good suggestions for what to call this.
Reviewed-by: Conor Dooley <conor.dooley at microchip.com>

Cheers,
Conor.
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