From: WANG Rui <wangrui@loongson.cn>
To: Huacai Chen <chenhuacai@loongson.cn>
Cc: Huacai Chen <chenhuacai@kernel.org>,
loongarch@lists.linux.dev, Xuefeng Li <lixuefeng@loongson.cn>,
Guo Ren <guoren@kernel.org>, Xuerui Wang <kernel@xen0n.name>,
Jiaxun Yang <jiaxun.yang@flygoat.com>,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>
Subject: Re: [PATCH] LoongArch: Specify -m32/-m64 explicitly for 32BIT/64BIT
Date: Tue, 28 Apr 2026 15:35:24 +0800 [thread overview]
Message-ID: <CAHirt9gdabrd=PY6aWJQmhueeea7NeeZijP_rP_egnQ+-LKnoQ@mail.gmail.com> (raw)
In-Reply-To: <20260428070658.1740856-1-chenhuacai@loongson.cn>
On Tue, Apr 28, 2026 at 3:07 PM Huacai Chen <chenhuacai@loongson.cn> wrote:
>
> Clang/LLVM build needs -m32/-m64 to switch triple variants (i.e. the
> --target=xxx parameter). Otherwise we get build errors for CONFIG_32BIT.
>
> GCC doesn't support -m32/-m64 now, but maybe support in future, so use
> cc-option to specify them.
>
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202604232041.ESJDwVG4-lkp@intel.com/
> Suggested-by: Nathan Chancellor <nathan@kernel.org
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Tested-by: WANG Rui <wangrui@loongson.cn>
Both Clang 18 building loongarch64 and Clang 22 building loongarch32
work as expected.
Cheers,
Rui
> ---
> arch/loongarch/Makefile | 2 ++
> arch/loongarch/vdso/Makefile | 2 ++
> 2 files changed, 4 insertions(+)
>
> diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
> index 47516aeea9d2..54fcfa1eac1f 100644
> --- a/arch/loongarch/Makefile
> +++ b/arch/loongarch/Makefile
> @@ -55,9 +55,11 @@ endif
> ifdef CONFIG_32BIT
> tool-archpref = $(32bit-tool-archpref)
> UTS_MACHINE := loongarch32
> +cflags-y += $(call cc-option,-m32)
> else
> tool-archpref = $(64bit-tool-archpref)
> UTS_MACHINE := loongarch64
> +cflags-y += $(call cc-option,-m64)
> endif
>
> ifneq ($(SUBARCH),$(ARCH))
> diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile
> index 42aa96249828..9c9181bb4071 100644
> --- a/arch/loongarch/vdso/Makefile
> +++ b/arch/loongarch/vdso/Makefile
> @@ -12,6 +12,8 @@ obj-vdso-$(CONFIG_GENERIC_GETTIMEOFDAY) += vgettimeofday.o
> ccflags-vdso := \
> $(filter -I%,$(KBUILD_CFLAGS)) \
> $(filter -E%,$(KBUILD_CFLAGS)) \
> + $(filter -m32,$(KBUILD_CFLAGS)) \
> + $(filter -m64,$(KBUILD_CFLAGS)) \
> $(filter -march=%,$(KBUILD_CFLAGS)) \
> $(filter -m%-float,$(KBUILD_CFLAGS)) \
> $(CLANG_FLAGS) \
> --
> 2.52.0
>
>
prev parent reply other threads:[~2026-04-28 7:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-28 7:06 [PATCH] LoongArch: Specify -m32/-m64 explicitly for 32BIT/64BIT Huacai Chen
2026-04-28 7:35 ` WANG Rui [this message]
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