linux-kernel - [PATCH] ARM: disable ARMv6 for Clang older than 8.0

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Message-Id: <20180930222230.24167-1-stefan@agner.ch>
Date:   Mon,  1 Oct 2018 00:22:30 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     linux@...linux.org.uk, arnd@...db.de
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH] ARM: disable ARMv6 for Clang older than 8.0

The kernel passes the ArmV6K architecture to the compiler when
using the multi platform selection and enabling ARMv6. Clang
older than version 8.0 emit assembly with an non-existing CPU,
which then makes the assembler fail. Prevent the user from
selecting ARMv6 when using Clang before 8.0.

Signed-off-by: Stefan Agner <stefan@...er.ch>
Link: https://github.com/ClangBuiltLinux/linux/issues/55
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e8cd55a5b04c..8da160757381 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -671,6 +671,7 @@ config ARCH_MULTI_V4_V5
 
 config ARCH_MULTI_V6
 	bool "ARMv6 based platforms (ARM11)"
+	depends on !CC_IS_CLANG || CLANG_VERSION>=80000
 	select ARCH_MULTI_V6_V7
 	select CPU_V6K
 
-- 
2.19.0