Introduce CPP_FOR_TARGET in Makefile

Makefile.example

@@ -1,4 +1,4 @@
-TOPDIR =  $(shell pwd)
+TOPDIR :=  $(shell pwd)
 ARCH = x86
 NAME = metalsvm
 LWIPDIRS = lwip/src/arch lwip/src/api lwip/src/core lwip/src/core/ipv4 lwip/src/netif
@@ -17,6 +17,7 @@ CROSSCOMPREFIX=
 CC_FOR_TARGET = $(CROSSCOMPREFIX)gcc
 CXX_FOR_TARGET = $(CROSSCOMPREFIX)g++
 GCC_FOR_TARGET = $(CROSSCOMPREFIX)gcc
+CPP_FOR_TARGET = $(CROSSCOMPREFIX)cpp
 AR_FOR_TARGET = $(CROSSCOMPREFIX)ar
 AS_FOR_TARGET = $(CROSSCOMPREFIX)as
 LD_FOR_TARGET = $(CROSSCOMPREFIX)ld
@@ -27,19 +28,19 @@ RANLIB_FOR_TARGET=$(CROSSCOMPREFIX)ranlib
 STRIP_FOR_TARGET = $(CROSSCOMPREFIX)strip
 READELF_FOR_TARGET = $(CROSSCOMPREFIX)readelf
 
+MAKE = make
+RM = rm -rf
 NASM = nasm
 EMU = qemu
 GDB = gdb
 
-MAKE = make
 NASMFLAGS = -felf32 -g
 INCLUDE = -I$(TOPDIR)/include -I$(TOPDIR)/arch/$(ARCH)/include -I$(TOPDIR)/lwip/src/include -I$(TOPDIR)/lwip/src/include/ipv4 -I$(TOPDIR)/drivers
 # Compiler options for final code
 CFLAGS = -g -m32 -march=i586 -Wall -O2 -fno-builtin -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc $(INCLUDE) $(STACKPROT)
-# Compiler options for debuuging
+# Compiler options for debugging
 #CFLAGS = -g -O -m32 -march=i586 -Wall -fno-builtin -DWITH_FRAME_POINTER -nostdinc $(INCLUDE) $(STACKPROT)
 ARFLAGS = rsv
-RM = rm -rf
 LDFLAGS = -T link.ld -z max-page-size=4096 --defsym __BUILD_DATE=$(shell date +'%Y%m%d') --defsym __BUILD_TIME=$(shell date +'%H%M%S')
 STRIP_DEBUG = --strip-debug
 KEEP_DEBUG = --only-keep-debug
@@ -104,7 +105,7 @@ veryclean: clean
 	@echo [CC] $@
 	$Q$(CC_FOR_TARGET) -c -D__KERNEL__ $(CFLAGS) -o $@ $<
 	@echo [DEP] $*.dep
-	$Q$(CC_FOR_TARGET) -MF $*.dep -MT $*.o -MM $(CFLAGS) $<
+	$Q$(CPP_FOR_TARGET) -MF $*.dep -MT $*.o -MM $(CFLAGS) $<
 
 
 %.o : %.asm