linux-kernel - [PATCH 4.19 057/106] ARM: 8875/1: Kconfig: default to AEABI w/ Clang

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Message-Id: <20191006171147.869327445@linuxfoundation.org>
Date:   Sun,  6 Oct 2019 19:21:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 057/106] ARM: 8875/1: Kconfig: default to AEABI w/ Clang

From: Nick Desaulniers <ndesaulniers@...gle.com>

[ Upstream commit a05b9608456e0d4464c6f7ca8572324ace57a3f4 ]

Clang produces references to __aeabi_uidivmod and __aeabi_idivmod for
arm-linux-gnueabi and arm-linux-gnueabihf targets incorrectly when AEABI
is not selected (such as when OABI_COMPAT is selected).

While this means that OABI userspaces wont be able to upgraded to
kernels built with Clang, it means that boards that don't enable AEABI
like s3c2410_defconfig will stop failing to link in KernelCI when built
with Clang.

Link: https://github.com/ClangBuiltLinux/linux/issues/482
Link: https://groups.google.com/forum/#!msg/clang-built-linux/yydsAAux5hk/GxjqJSW-AQAJ

Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/Kconfig | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 51794c7fa6d5b..185e552f14610 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1586,8 +1586,9 @@ config ARM_PATCH_IDIV
 	  code to do integer division.
 
 config AEABI
-	bool "Use the ARM EABI to compile the kernel" if !CPU_V7 && !CPU_V7M && !CPU_V6 && !CPU_V6K
-	default CPU_V7 || CPU_V7M || CPU_V6 || CPU_V6K
+	bool "Use the ARM EABI to compile the kernel" if !CPU_V7 && \
+		!CPU_V7M && !CPU_V6 && !CPU_V6K && !CC_IS_CLANG
+	default CPU_V7 || CPU_V7M || CPU_V6 || CPU_V6K || CC_IS_CLANG
 	help
 	  This option allows for the kernel to be compiled using the latest
 	  ARM ABI (aka EABI).  This is only useful if you are using a user
-- 
2.20.1