Index: kernel/Makefile
===================================================================
--- kernel/Makefile	(revision 6c5fc8e64e6f490c80d5b81a11bd62778227d0c9)
+++ kernel/Makefile	(revision 26bcc6588909e81e11452976f8e06707b843cb49)
@@ -100,10 +100,12 @@
 	-Werror-implicit-function-declaration -wd170
 
+# clang does not support following options but I am not sure whether
+# something won't break because of that:
+# -fexec-charset=UTF-8 -fwide-exec-charset=UTF-32$(ENDIANESS) -finput-charset=UTF-8
 CLANG_CFLAGS = $(INCLUDES_FLAGS) -O$(OPTIMIZATION) -imacros $(CONFIG_HEADER) \
-	-fexec-charset=UTF-8 -fwide-exec-charset=UTF-32$(ENDIANESS) \
-	-finput-charset=UTF-8 -ffreestanding -fno-builtin -nostdlib -nostdinc \
+	-ffreestanding -fno-builtin -nostdlib -nostdinc \
 	-Wall -Wextra -Wno-unused-parameter -Wmissing-prototypes \
 	-Werror-implicit-function-declaration -Wwrite-strings \
-	-pipe -arch $(CLANG_ARCH)
+	-pipe -target $(CLANG_TARGET)
 
 ifeq ($(CONFIG_DEBUG),y)
@@ -387,5 +389,5 @@
 
 $(LINK): $(LINK).in $(DEPEND)
-	$(GCC) $(DEFS) $(GCC_CFLAGS) -D__ASM__ -D__LINKER__ -E -x c $< | grep -v "^\#" > $@
+	$(CC) $(DEFS) $(CFLAGS) -D__ASM__ -D__LINKER__ -E -x c $< | grep -v "^\#" > $@
 
 %.o: %.S $(DEPEND)