linux-kernel - Re: [PATCH 1/2] Makefile: Remove '--gcc-toolchain' flag

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Date:   Tue, 2 Mar 2021 14:33:38 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 1/2] Makefile: Remove '--gcc-toolchain' flag

On Tue, Mar 2, 2021 at 1:07 PM Nathan Chancellor <nathan@...nel.org> wrote:
>
> This is not necessary anymore now that we specify '--prefix=', which
> tells clang exactly where to find the GNU cross tools. This has been
> verified with self compiled LLVM 10.0.1 and LLVM 13.0.0 as well as a
> distribution version of LLVM 11.1.0 without binutils in the LLVM
> toolchain locations.
>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

I see this pattern still being used in
arch/arm64/kernel/vdso32/Makefile, but that can be separate cleanups.

> ---
>  Makefile | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index f9b54da2fca0..c20f0ad8be73 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -568,10 +568,6 @@ ifneq ($(CROSS_COMPILE),)
>  CLANG_FLAGS    += --target=$(notdir $(CROSS_COMPILE:%-=%))
>  GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
>  CLANG_FLAGS    += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
> -GCC_TOOLCHAIN  := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
> -endif
> -ifneq ($(GCC_TOOLCHAIN),)
> -CLANG_FLAGS    += --gcc-toolchain=$(GCC_TOOLCHAIN)
>  endif
>  ifneq ($(LLVM_IAS),1)
>  CLANG_FLAGS    += -no-integrated-as
>
> base-commit: 7a7fd0de4a9804299793e564a555a49c1fc924cb
> --
> 2.31.0.rc0.75.gec125d1bc1
>


-- 
Thanks,
~Nick Desaulniers