#
# VirtualBox Guest Additions Module Makefile.
#
# (For 2.6.x this file must be 'Makefile'!)
#
# Copyright (C) 2006-2010 Oracle Corporation
#
# Use only with permission
#

#
MODULE = vboxadd_test
OBJS   = test.o

ifneq ($(MAKECMDGOALS),clean)

# kernel base directory
ifndef KERN_DIR
 KERN_DIR := /lib/modules/$(shell uname -r)/build
 ifneq ($(shell if test -d $(KERN_DIR); then echo yes; fi),yes)
  KERN_DIR := /usr/src/linux
  ifneq ($(shell if test -d $(KERN_DIR); then echo yes; fi),yes)
   $(error Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again.)
  endif
  $(warning Warning: using /usr/src/linux as the source directory of your Linux kernel. If this is not correct, specify KERN_DIR=<directory> and run Make again.)
 endif
else
 ifneq ($(shell if test -d $(KERN_DIR); then echo yes; fi),yes)
  $(error Error: KERN_DIR does not point to a directory.)
 endif
endif

# includes
ifndef KERN_INCL
 KERN_INCL = $(KERN_DIR)/include
endif
ifneq ($(shell if test -d $(KERN_INCL); then echo yes; fi),yes)
 $(error Error: unable to find the include directory for your current Linux kernel. Specify KERN_INCL=<directory> and run Make again.)
endif

# guess kernel version (24 or 26)
ifeq ($(shell if grep '"2.4.' $(KERN_INCL)/linux/version.h > /dev/null; then echo yes; fi),yes)
KERN_VERSION := 24
else
KERN_VERSION := 26
endif
# KERN_VERSION := $(if $(wildcard $(KERN_DIR)/Rules.make),24,26)

# debug - show guesses.
ifdef DEBUG
$(warning dbg: KERN_DIR     = $(KERN_DIR))
$(warning dbg: KERN_INCL    = $(KERN_INCL))
$(warning dbg: MODULE_DIR   = $(MODULE_DIR))
$(warning dbg: KERN_VERSION = $(KERN_VERSION))
endif


#
# Compiler options
#
ifndef INCL
 INCL    := -I$(KERN_INCL) $(addprefix -I, $(EXTRA_INCL))
 ifndef KBUILD_EXTMOD
  KBUILD_EXTMOD := $(shell pwd)
 endif
 INCL    += $(addprefix -I$(KBUILD_EXTMOD),/ /include /r0drv/linux)
 export INCL
endif
KFLAGS   := -D__KERNEL__ -DMODULE -DRT_OS_LINUX -DIN_RING0 -D_X86_ -DIN_RT_R0 -DIN_SUP_R0 \
	    -DVBGL_VBOXGUEST -DVBGL_HGCM -DVBOX_WITH_HGCM
ifeq ($(BUILD_TYPE),debug)
KFLAGS   += -DDEBUG
endif

ifeq ($(KERN_VERSION), 24)
#
# 2.4
#

CFLAGS := -DVBOX_LINUX_2_4 $(INCL) $(KFLAGS) $(KDEBUG)
MODULE_EXT := o

# 2.4 Module linking
$(MODULE).o: $(OBJS)
	$(LD) -o $@ -r $(OBJS)

.PHONY: $(MODULE)
all: $(MODULE)
$(MODULE): $(MODULE).o

else
#
# 2.6 and later
#

MODULE_EXT := ko

$(MODULE)-y  := $(OBJS)

# build defs
EXTRA_CFLAGS += $(INCL) $(KFLAGS) $(KDEBUG)

all: $(MODULE)

obj-m += $(MODULE).o

$(MODULE):
	$(MAKE) KBUILD_VERBOSE=1 -C $(KERN_DIR) SUBDIRS=$(CURDIR) SRCROOT=$(CURDIR) modules

endif

endif # eq($(MAKECMDGOALS),clean)

clean:
	for f in . linux r0drv r0drv/linux; do rm -f $$f/*.o $$f/.*.cmd $$f/.*.flags; done
	rm -rf .vboxdrv* .tmp_ver* vboxdrv.* Module.symvers Modules.symvers