[PATCH v2 20/20] arm64: vdso32: Enable Clang Compilation

[Vincenzo Frascino]

Enable Clang Compilation for the vdso32 library.

Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
---
 arch/arm64/kernel/vdso32/Makefile | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index 04df57b43cb1..650cfc5757eb 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -10,7 +10,18 @@ include $(srctree)/lib/vdso/Makefile
 
 # Same as cc-*option, but using CC_COMPAT instead of CC
 ifeq ($(CONFIG_CC_IS_CLANG), y)
-CC_COMPAT ?= $(CC)
+COMPAT_GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE_COMPAT)elfedit))
+COMPAT_GCC_TOOLCHAIN := $(realpath $(COMPAT_GCC_TOOLCHAIN_DIR)/..)
+
+CLANG_CC_COMPAT := $(CC)
+CLANG_CC_COMPAT += --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
+CLANG_CC_COMPAT += --prefix=$(COMPAT_GCC_TOOLCHAIN_DIR)
+CLANG_CC_COMPAT += -no-integrated-as -Qunused-arguments
+ifneq ($(COMPAT_GCC_TOOLCHAIN),)
+CLANG_CC_COMPAT += --gcc-toolchain=$(COMPAT_GCC_TOOLCHAIN)
+endif
+
+CC_COMPAT ?= $(CLANG_CC_COMPAT)
 else
 CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc
 endif
-- 
2.25.1