From 3acf4be235280f14d838581a750532219d67facc Mon Sep 17 00:00:00 2001 From: Vincenzo Frascino Date: Wed, 26 Jun 2019 12:36:32 +0100 Subject: [PATCH] arm64: vdso: Fix compilation with clang older than 8 clang versions older than 8 do not support -mcmodel=tiny. Add a check to the vDSO Makefile for arm64 to remove the flag when these versions of the compiler are detected. Reported-by: Qian Cai Signed-off-by: Vincenzo Frascino Signed-off-by: Thomas Gleixner Tested-by: Qian Cai Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mips@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Cc: catalin.marinas@arm.com Cc: will.deacon@arm.com Cc: arnd@arndb.de Cc: linux@armlinux.org.uk Cc: ralf@linux-mips.org Cc: paul.burton@mips.com Cc: daniel.lezcano@linaro.org Cc: salyzyn@android.com Cc: pcc@google.com Cc: shuah@kernel.org Cc: 0x7f454c46@gmail.com Cc: linux@rasmusvillemoes.dk Cc: huw@codeweavers.com Cc: sthotton@marvell.com Cc: andre.przywara@arm.com Cc: luto@kernel.org Link: https://lkml.kernel.org/r/20190626113632.9295-1-vincenzo.frascino@arm.com --- arch/arm64/kernel/vdso/Makefile | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index ec81d28aeb5d..4ab863045188 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -38,6 +38,13 @@ else CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -include $(c-gettimeofday-y) endif +# Clang versions less than 8 do not support -mcmodel=tiny +ifeq ($(CONFIG_CC_IS_CLANG), y) + ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0) + CFLAGS_REMOVE_vgettimeofday.o += -mcmodel=tiny + endif +endif + # Disable gcov profiling for VDSO code GCOV_PROFILE := n -- 2.30.2