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Message-ID: <a55e4534ef759585088a037e4cfd8468@agner.ch>
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
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