Commit fb8722735f50 ("arm64: support __int128 on gcc 5+") added support
for arm64 __int128 with gcc with a version-conditional, but neglected to
enable this for clang, which in fact appears to support aarch64 __int128.
This commit therefore enables it if the compiler is clang, using the
same type of makefile conditional used elsewhere in the tree.

Signed-off-by: Jason A. Donenfeld <ja...@zx2c4.com>
---
 arch/arm64/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index b481b4a7c011..16c2e8b58546 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -57,7 +57,11 @@ KBUILD_AFLAGS        += $(lseinstr) $(brokengasinst)
 KBUILD_CFLAGS  += $(call cc-option,-mabi=lp64)
 KBUILD_AFLAGS  += $(call cc-option,-mabi=lp64)
 
+ifeq ($(cc-name),clang)
+KBUILD_CFLAGS  += -DCONFIG_ARCH_SUPPORTS_INT128
+else
 KBUILD_CFLAGS  += $(call cc-ifversion, -ge, 0500, 
-DCONFIG_ARCH_SUPPORTS_INT128)
+endif
 
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 KBUILD_CPPFLAGS        += -mbig-endian
-- 
2.15.1

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