CPPFLAGS += -DCC_VERSION='"$(cc_version)"'
CPPFLAGS += -Werror-implicit-function-declaration
CPPFLAGS += -Wmissing-format-attribute
+CPPFLAGS += -Wmissing-noreturn
CPPFLAGS += -Wunused-macros
CPPFLAGS += -Wbad-function-cast
CPPFLAGS += -DMAIN_INPUT_FILE_IS_$(*F)