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From:   Stefan Agner <stefan@agner.ch>
To:     linux@armlinux.org.uk, ard.biesheuvel@linaro.org, arnd@arndb.de
Cc:     robin.murphy@arm.com, nicolas.pitre@linaro.org,
        marc.zyngier@arm.com, behanw@converseincode.com,
        keescook@chromium.org, Bernhard.Rosenkranzer@linaro.org,
        mka@chromium.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, Stefan Agner <stefan@agner.ch>
Subject: [PATCH v2 5/6] ARM: add support for building ARM kernel with clang
Date:   Sun, 25 Mar 2018 20:09:58 +0200
Message-Id: <20180325180959.28008-6-stefan@agner.ch>
In-Reply-To: <20180325180959.28008-1-stefan@agner.ch>
References: <20180325180959.28008-1-stefan@agner.ch>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Use cc-options call for compiler options which are not available
in clang. With this patch an ARMv7 multi platform kernel can be
successfully build using clang (tested with version 5.0.1).

Based-on-patches-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
---
Changes in v2:
- Drop cc-options in CONFIG_FRAME_POINTER=y case

 arch/arm/boot/compressed/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 45a6b9b7af2a..6a5c4ac97703 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -113,7 +113,7 @@ CFLAGS_fdt_ro.o := $(nossp_flags)
 CFLAGS_fdt_rw.o := $(nossp_flags)
 CFLAGS_fdt_wip.o := $(nossp_flags)
 
-ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
+ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin -I$(obj)
 asflags-y := -DZIMAGE
 
 # Supply kernel BSS size to the decompressor via a linker symbol.
-- 
2.16.2