[PATCH] arm64: vdso: Fix compilation with clang < 8

[Vincenzo Frascino]

clang versions previous to 8 do not support -mcmodel=tiny.

Add a check to the vDSO Makefile for arm64 to remove the flag when these
versions of the compiler are detected.

Reported-by: Qian Cai <cai@xxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
---
 arch/arm64/kernel/vdso/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index ec81d28aeb5d..c11cbf71073f 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -38,6 +38,11 @@ else
 CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -include $(c-gettimeofday-y)
 endif
 
+# Clang versions less than 8 do not support -mcmodel=tiny
+ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0)
+CFLAGS_REMOVE_vgettimeofday.o = -mcmodel=tiny
+endif
+
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n
 
-- 
2.22.0


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