linux-kernel - Re: [PATCH] sparc/build: Make all compiler flags also clang-compatible

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Message-ID: <ee12bbe782e44a96f4894dfd9ab0550233014c19.camel@physik.fu-berlin.de>
Date: Sat, 22 Jun 2024 09:29:05 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Nathan Chancellor <nathan@...nel.org>, koachan@...tonmail.com
Cc: "David S. Miller" <davem@...emloft.net>, Andreas Larsson
 <andreas@...sler.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Bill
 Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 sparclinux@...r.kernel.org,  linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev
Subject: Re: [PATCH] sparc/build: Make all compiler flags also
 clang-compatible

Hi Nathan,

On Fri, 2024-06-21 at 11:53 -0700, Nathan Chancellor wrote:
> I think a good amount of the reasoning below the '---' could probably
> make it into the commit message as well but I don't have much of a
> vision there, maybe one of the SPARC folks will.
> 
> I saw through the LLVM issue above that one other patch is necessary to
> fix an issue in the vDSO [1], which I applied in testing this one. I
> noticed in applying that change that you appear to be working on 6.1,
> which is fine for now, but you'll need another diff once you get to a
> newer version, as we stopped using CROSS_COMPILE to set clang's
> '--target=' value:
> 
> diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
> index 6c23c6af797f..2435efae67f5 100644
> --- a/scripts/Makefile.clang
> +++ b/scripts/Makefile.clang
> @@ -10,6 +10,7 @@ CLANG_TARGET_FLAGS_mips		:= mipsel-linux-gnu
>  CLANG_TARGET_FLAGS_powerpc	:= powerpc64le-linux-gnu
>  CLANG_TARGET_FLAGS_riscv	:= riscv64-linux-gnu
>  CLANG_TARGET_FLAGS_s390		:= s390x-linux-gnu
> +CLANG_TARGET_FLAGS_sparc	:= sparc64-linux-gnu
>  CLANG_TARGET_FLAGS_x86		:= x86_64-linux-gnu
>  CLANG_TARGET_FLAGS_um		:= $(CLANG_TARGET_FLAGS_$(SUBARCH))
>  CLANG_TARGET_FLAGS		:= $(CLANG_TARGET_FLAGS_$(SRCARCH))
> 
> With those, I can successfully build a kernel with clang that boots in
> QEMU :)
> 
>   $ make -skj"$(nproc)" \
>          ARCH=sparc64 \
>          CC=clang \
>          CROSS_COMPILE=sparc64-linux-gnu- \
>          LLVM_IAS=0 \
>          mrproper defconfig all
> 
>   $ qemu-system-sparc64 \
>         -serial mon:stdio \
>         -display none \
>         -no-reboot \
>         -M sun4u \
>         -cpu 'TI UltraSparc IIi' \
>         -m 512 \
>         -append console=ttyS0 \
>         -initrd sparc64-rootfs.cpio \
>         -kernel arch/sparc/boot/image
>   ...
>   [    1.788544] Run /init as init process
>   ...
>   Linux version 6.10.0-rc4+ (nathan@...lio-3990X) (ClangBuiltLinux clang version 19.0.0git (https://github.com/llvm/llvm-project a083e50f53f0f9eb9ad0c5b65f3c627cf97043e6), GNU ld (GNU Binutils) 2.42) #1 SMP Fri Jun 21 11:36:18 MST 2024
>   ...

Wow, this is really great progress. Kudos to everyone who helped to make this happen!

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913