[PATCH] Drop -freg-struct-return argument (unsupported by Clang)

lll-project (llvm-linux with clang)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 637f61a..613c0a3 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -25,7 +25,8 @@ ifeq ($(CONFIG_X86_32),y)
                 LDFLAGS_vmlinux := --emit-relocs
         endif

-        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
+        # Drop -freg-struct-return argument (unsupported by Clang)
+       KBUILD_CFLAGS += -msoft-float -mregparm=3

         # prevent gcc from keeping the stack 16 byte aligned
         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)