linux-kernel - Re: [PATCH v2 1/3] rust: make mutually exclusive with CFI

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Message-ID: <20240227-unwind-canteen-3da9b07af10c@wendy>
Date: Tue, 27 Feb 2024 13:02:11 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
CC: Nathan Chancellor <nathan@...nel.org>, Conor Dooley <conor@...nel.org>,
	Matthew Maurer <mmaurer@...gle.com>, <linux-riscv@...ts.infradead.org>,
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson
 Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary
 Guo <gary@...yguo.net>, Björn Roy Baron
	<bjorn3_gh@...tonmail.com>, Jonathan Corbet <corbet@....net>, Paul Walmsley
	<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Nick
 Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
	<rust-for-linux@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>,
	<stable@...r.kernel.org>, Sami Tolvanen <samitolvanen@...gle.com>, Ramon de C
 Valle <rcvalle@...gle.com>
Subject: Re: [PATCH v2 1/3] rust: make mutually exclusive with CFI_CLANG

On Tue, Feb 27, 2024 at 01:34:14PM +0100, Miguel Ojeda wrote:
> On Tue, Feb 27, 2024 at 11:54 AM Conor Dooley
> <conor.dooley@...rochip.com> wrote:
> >
> > I did try to test it but I ran into too many toolchain issues - my
> > older copies of LLVM (pre 17) are not multiarch as I built them by hand
> > with PGO for x86 and RISC-V. My LLVM 17 is from kernel.org and has no
> > libclang. And then the copy of LLVM 18 on kernel.org apparently does not
> > support kcfi at all. I gave up there, but I don't see how this would not
> 
> I asked Nathan to add libclang a few days ago, and he very quickly did
> it for LLVM 18 -- though I don't know the plan for the others. I just
> pinged in that thread.

I had actually said it to him on IRC already (although he is CCed here)
but I just noticed that this was my fault - I symlinked incorrectly
after downloading the toolchain. kcfi is detected fine with llvm18.
I'll give testing another try.

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