ARM: 8875/1: Kconfig: default to AEABI w/ Clang

BugLink: https://bugs.launchpad.net/bugs/1848047
[ 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@arndb.de>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 24360211534abe47a053dbc575c6e46c49e3c734..5e2c68e9dd6e24b5421ef5ee1df297ddc28384ec 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1572,8 +1572,9 @@ 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