linux-kernel - Re: riscv: llvm-compiler: calling convention violation: temporary register $t2 is used to pass the ninth function parameter

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Date:   Fri, 13 May 2022 12:39:55 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Changbin Du <changbin.du@...wei.com>
Cc:     Craig Topper <craig.topper@...ive.com>,
        Alex Bradbury <asb@...radbury.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Steven Rostedt <rostedt@...dmis.org>, hw.huiwang@...wei.com,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        llvm@...ts.linux.dev
Subject: Re: riscv: llvm-compiler: calling convention violation: temporary
 register $t2 is used to pass the ninth function parameter

On Thu, May 12, 2022 at 8:46 PM Changbin Du <changbin.du@...wei.com> wrote:
>
> On Thu, May 12, 2022 at 07:49:41AM -0700, Craig Topper wrote:
> > Changbin, can you provide a pre-processed source and a command line? I can
> > reduce it on the llvm side.
> >
>
> hmm, clang can not build the preprocessed source by itself!

Sorry, I should have provided more info.

In order to get the preprocessed source, you generally can do:

$ ARCH=riscv make LLVM=1 -j$(nproc) defconfig lib/string.i

replace the final command line parameter with the path to the source
file you care about.

Then, to get the command line invocation, you can do:

$ ARCH=riscv make LLVM=1 -j$(nproc) lib/string.o V=1

Then you can provide the output of those two commands.
-- 
Thanks,
~Nick Desaulniers