Supress more warnings.

Makefile.config

@@ -61,8 +61,12 @@ HOSTCFLAGS += $(call cc-option, -Wno-unused)            \
               $(call cc-option, -Wno-unused-parameter)  \
               $(call cc-option, -Wno-unused-variable)
 
-# don't warn about about missing field initializers
-HOSTCFLAGS += $(call cc-option, -Wno-missing-field-initializers)
+# ignore initializer warnings
+HOSTCFLAGS += $(call cc-option, -Wno-missing-field-initializers)  \
+              $(call cc-option, -Wno-initializer-overrides)
+
+# ignore shift overflow warnings (they are copious with Clang)
+HOSTCFLAGS += $(call cc-option, -Wno-shift-overflow)
 
 # warn when a global function is defined without a prototype declaration
 HOSTCFLAGS += $(call cc-option, -Wmissing-prototypes)
@@ -102,8 +106,12 @@ KBUILD_CFLAGS += $(call cc-option, -Wstrict-prototypes)
 # make Clang produce errors when it encounters an option it doesn't support 
 KBUILD_CFLAGS += $(call cc-option, -Werror-unused-arguments)
 
-# don't warn about about missing field initializers
-KBUILD_CFLAGS += $(call cc-option, -Wno-missing-field-initializers)
+# ignore initializer warnings
+KBUILD_CFLAGS += $(call cc-option, -Wno-missing-field-initializers)  \
+                 $(call cc-option, -Wno-initializer-overrides)
+
+# ignore shift overflow warnings (they are copious with Clang)
+KBUILD_CFLAGS += $(call cc-option, -Wno-shift-overflow)
 
 # suppress unused warnings
 KBUILD_CFLAGS += $(call cc-option, -Wno-unused)           \
@@ -158,7 +166,7 @@ KBUILD_CPPFLAGS := -D__KERNEL__
 # macros
 KBUILD_AFLAGS := -D__ASSEMBLY__
 
-# don't use Clang's integrated assembler
+# don't use Clang's integrated assembler for assembly source files (for now)
 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
 
 # kernel-specific flags