> Providing a definition in config-host.mak involves duplicating the > value, which can't be right.
Huh? No it doesn't. config-host.mak contains CPPFLAGS= then Makefile.target contains CPPFLAGS+=whatever > If there's no other way to do it then > there should be a reference to USER_CPPFLAGS or some such but frankly > that's a pain and overkill. Why don't you just put your custom flags in CFLAGS, not CPPFLAGS? The former is deliberately left for the user to override. Paul