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Fri, 09 Nov 2018 10:34:23 -0800 (PST) Subject: Re: [PATCH v2 2/2] kbuild: consolidate Clang compiler flags To: Nick Desaulniers , Masahiro Yamada References: <1541473495-25262-1-git-send-email-yamada.masahiro@socionext.com> <1541473495-25262-2-git-send-email-yamada.masahiro@socionext.com> From: Greg Hackmann Message-ID: <9c4868dd-82fa-aa5c-843e-e1f78ffbc7e2@google.com> Date: Fri, 9 Nov 2018 10:34:22 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Sat, 10 Nov 2018 11:12:25 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Marek , Linux Kbuild mailing list , LKML , Stefan Agner , Matthias Kaehlcke , joel@jms.id.au, Nathan Chancellor , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 11/09/2018 10:29 AM, Nick Desaulniers wrote: > On Mon, Nov 5, 2018 at 7:05 PM Masahiro Yamada > wrote: >> >> Collect basic Clang options such as --target, --prefix, --gcc-toolchain, >> -no-integrated-as into a single variable CLANG_FLAGS so that it can be >> easily reused in other parts of Makefile. >> >> Signed-off-by: Masahiro Yamada >> --- >> >> Changes in v2: >> - Use := flavor instead of = because $(CLANG_FLAGS) is expanded soon anyway >> >> Makefile | 13 ++++++------- >> 1 file changed, 6 insertions(+), 7 deletions(-) >> >> diff --git a/Makefile b/Makefile >> index da11700..e173a73 100644 >> --- a/Makefile >> +++ b/Makefile >> @@ -487,18 +487,17 @@ endif >> >> ifneq ($(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) >> 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 += -no-integrated-as >> -KBUILD_AFLAGS += -no-integrated-as >> +CLANG_FLAGS += -no-integrated-as >> +KBUILD_CFLAGS += $(CLANG_FLAGS) >> +KBUILD_AFLAGS += $(CLANG_FLAGS) >> endif >> >> RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register >> -- >> 2.7.4 >> > > Thanks for this patch, Masahiro, it's a good simplification. > Reviewed-by: Nick Desaulniers > Tested-by: Nick Desaulniers > > Would you mind waiting for a tested-by from Stefan, and maybe an ack > from Greg (added to cc)? > Acked-by: Greg Hackmann