linux-kernel - [PATCH AUTOSEL 5.3 46/89] arm64: Default to building compat vDSO with clang when CONFIG_CC_IS

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Message-Id: <20191018220324.8165-46-sashal@kernel.org>
Date:   Fri, 18 Oct 2019 18:02:41 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.3 46/89] arm64: Default to building compat vDSO with clang when CONFIG_CC_IS_CLANG

From: Will Deacon <will@...nel.org>

[ Upstream commit 24ee01a927bfe56c66429ec4b1df6955a814adc8 ]

Rather than force the use of GCC for the compat cross-compiler, instead
extract the target from CROSS_COMPILE_COMPAT and pass it to clang if the
main compiler is clang.

Acked-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm64/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 9743b50bdee7d..5858d6e449268 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -47,7 +47,11 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable)
   endif
 endif
 
+ifeq ($(CONFIG_CC_IS_CLANG), y)
+COMPATCC ?= $(CC) --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
+else
 COMPATCC ?= $(CROSS_COMPILE_COMPAT)gcc
+endif
 export COMPATCC
 
 ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
-- 
2.20.1