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

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Message-ID: <20250916-getaway-grew-46e4fb956a78@spud>
Date: Tue, 16 Sep 2025 18:21:35 +0100
From: Conor Dooley <conor@...nel.org>
To: Asuna Yang <spriteovo@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Han Gao <rabenda.cn@...il.com>,
	Jason Montleon <jmontleo@...hat.com>,
	rust-for-linux@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-kbuild@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v3] RISC-V: re-enable gcc + rust builds

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@...rochip.com>

Cheers,
Conor.

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