linux-kernel - Re: [PATCH] kbuild: consolidate Clang compiler flags

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Date:   Mon, 05 Nov 2018 10:09:11 +0100
From:   Stefan Agner <stefan@...er.ch>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Chris Fries <cfries@...gle.com>, Joel Stanley <joel@....id.au>,
        Daniel Axtens <dja@...ens.net>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: consolidate Clang compiler flags

On 05.11.2018 03:48, Masahiro Yamada wrote:
> Add basic options for Clang such as --target, --prefix, --gcc-toolchain,
> -no-integrated-as to a single variable CLANG_FLAGS.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
>  Makefile | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 93315eb..58c838a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -487,18 +487,17 @@ endif
>  
>  ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
>  ifneq ($(CROSS_COMPILE),)
> -CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
> +CLANG_FLAGS	= --target=$(notdir $(CROSS_COMPILE:%-=%))
>  GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
> -CLANG_PREFIX	:= --prefix=$(GCC_TOOLCHAIN_DIR)
> +CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)

So this will expand later now, is this ok?

--
Stefan

>  GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
>  endif
>  ifneq ($(GCC_TOOLCHAIN),)
> -CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
> +CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
>  endif
> -KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
> -KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
> -KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
> -KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
> +CLANG_FLAGS	+= $(call cc-option, -no-integrated-as)
> +KBUILD_CFLAGS	+= $(CLANG_FLAGS)
> +KBUILD_AFLAGS	+= $(CLANG_FLAGS)
>  endif
>  
>  RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern
> -mindirect-branch-register