move cflags default setting to target makefiles

SVN-Revision: 14866

rules.mk

@@ -29,6 +29,7 @@ confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
 strip_last=$(patsubst %.$(lastword $(subst .,$(space),$(1))),%,$(1))
 
 _SINGLE=export MAKEFLAGS=$(space);
+CFLAGS:=
 ARCH:=$(subst i486,i386,$(subst i586,i386,$(subst i686,i386,$(call qstrip,$(CONFIG_ARCH)))))
 BOARD:=$(call qstrip,$(CONFIG_TARGET_BOARD))
 TARGET_OPTIMIZATION:=$(call qstrip,$(CONFIG_TARGET_OPTIMIZATION))