Added ccache support and removed grub from defconfig due to brokenness at the moment.

.defconfig

@@ -628,8 +628,8 @@ BR2_GAMES=y
 #
 # bootloader for target device
 #
-BR2_TARGET_GRUB=y
-BR2_TARGET_GRUB_SPLASH=y
+# BR2_TARGET_GRUB is not set
+# BR2_TARGET_GRUB_SPLASH is not set
 # BR2_TARGET_GRUB_DISKLESS is not set
 # BR2_TARGET_GRUB_3c595 is not set
 # BR2_TARGET_GRUB_3c90x is not set

Makefile

@@ -78,6 +78,11 @@ CONFIG_SHELL:=$(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 
 export CONFIG_SHELL quiet Q KBUILD_VERBOSE VERBOSE
 
+HOSTCCACHE:=$(shell $(CONFIG_SHELL) -c "which ccache")
+ifneq ($(HOSTCCACHE),)
+BR2_HAVE_HOST_CCACHE=y
+endif
+
 ifndef HOSTAR
 HOSTAR:=ar
 endif
@@ -124,6 +129,12 @@ endif
 ifndef FCFLAGS_FOR_BUILD
 FCFLAGS_FOR_BUILD:=-g -O2
 endif
+
+ifeq ($(BR2_HAVE_HOST_CCACHE),y)
+HOSTCC:=$(HOSTCCACHE) $(HOSTCC)
+HOSTCXX:=$(HOSTCCACHE) $(HOSTCXX)
+endif
+
 export HOSTAR HOSTAS HOSTCC HOSTCXX HOSTFC HOSTLD