# pkg-linuxmodule.mk -- build tools for Click
# Eddie Kohler
#
# Copyright (c) 2006 Regents of the University of California
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, subject to the conditions
# listed in the Click LICENSE file. These conditions include: you must
# preserve this copyright notice, and you cannot mention the copyright
# holders in advertising related to the Software without their permission.
# The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
# notice is a summary of the Click LICENSE file; the license in that file is
# legally binding.

CLICKBUILD = linuxmodule

CC ?= $(CLICKKERNEL_CC)
CPP ?= $(CLICKCPP)
CXX ?= $(CLICKKERNEL_CXX)
CXXCPP ?= $(CLICKCXXCPP)
AR_CREATE ?= $(CLICKAR_CREATE)
RANLIB ?= $(CLICKRANLIB)
STRIP ?= $(CLICKSTRIP)

CPPFLAGS ?= $(CLICKCPPFLAGS) -DCLICK_LINUXMODULE
CFLAGS ?= $(CLICKCFLAGS_NDEBUG)
CXXFLAGS ?= $(CLICKCXXFLAGS_NDEBUG)
DEPCFLAGS ?= $(CLICKDEPCFLAGS)

DEFS ?= $(CLICKDEFS)
INCLUDES ?=  -I$(clickincludedir) -I$(clicksrcdir) -I$(clicklinuxdir)/include
LDFLAGS ?= $(CLICKLDFLAGS)

packagesrcdir ?= $(srcdir)
PACKAGE_OBJS ?= kpackage.ko

CLICK_BUILDTOOL ?= $(clickbindir)/click-buildtool
CLICK_ELEM2PACKAGE ?= $(CLICK_BUILDTOOL) elem2package $(ELEM2PACKAGE_INCLUDES)

ifneq ($(CLICK_LINUXMODULE_2_6),1)

CXXCOMPILE = $(CXX) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CXXFLAGS) $(DEPCFLAGS)
CXXLD = $(CXX)
CXXLINK = $(CXXLD) $(CXXFLAGS) $(LDFLAGS) -o $@
COMPILE = $(CC) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $(DEPCFLAGS)
CCLD = $(CC)
LINK = $(CCLD) $(CFLAGS) $(LDFLAGS) -o $@
FIXDEP = @-sed 's/\.o:/\.ko:/' < $*.d > $*.kd; /bin/rm -f $*.d

ifeq ($(V),1)
ccompile = $(COMPILE) $(1)
cxxcompile = $(CXXCOMPILE) $(1)
else
ccompile = @/bin/echo ' ' $(2) $< && $(COMPILE) $(1)
cxxcompile = @/bin/echo ' ' $(2) $< && $(CXXCOMPILE) $(1)
endif

.SUFFIXES:
.SUFFIXES: .c .cc .ko .kii

.c.ko:
	$(call ccompile,-c $< -o $@,CC)
	$(FIXDEP)
.cc.ko:
	$(call cxxcompile,-c $< -o $@,CXX)
	$(FIXDEP)
.cc.kii:
	$(call cxxcompile,-E $< > $@,CXXCPP)

ifneq ($(MAKECMDGOALS),clean)
-include kelements.mk
endif

OBJS = $(ELEMENT_OBJS) $(PACKAGE_OBJS) kversion.ko

endif

ifeq ($(CLICK_LINUXMODULE_2_6),1)
# Jump through hoops to avoid missing symbol warnings
$(package).ko: Makefile Kbuild always
	{ ( $(MAKE) -C $(clicklinuxdir) M=$(shell pwd) CLICK_PACKAGE_MAKING=linuxmodule-26 modules 2>&1 1>&3; echo $$? > .$(package).ko.status ) | grep -v '^\*\*\* Warning:.*undefined' 1>&2; } 3>&1; v=`cat .$(package).ko.status`; rm .$(package).ko.status; exit $$v
Kbuild: $(CLICK_BUILDTOOL)
	echo 'include $$(obj)/Makefile' > Kbuild
	$(CLICK_BUILDTOOL) kbuild >> Kbuild
else
$(package).ko: $(clickdatadir)/pkg-linuxmodule.mk $(OBJS)
	$(LD) -r -o $(package).ko $(OBJS)
	$(STRIP) -g $(package).ko
endif

elemlist kelements.conf: $(CLICK_BUILDTOOL)
	echo $(packagesrcdir) | $(CLICK_BUILDTOOL) findelem -r linuxmodule -r $(package) -P $(CLICKFINDELEMFLAGS) > kelements.conf
kelements.mk: kelements.conf $(CLICK_BUILDTOOL)
	$(CLICK_BUILDTOOL) elem2make -t linuxmodule < kelements.conf > kelements.mk
kpackage.cc: kelements.conf $(CLICK_BUILDTOOL)
	$(CLICK_ELEM2PACKAGE) $(package) < kelements.conf > kpackage.cc
	@rm -f kpackage.kd
kversion.c: $(CLICK_BUILDTOOL)
	$(CLICK_BUILDTOOL) kversion $(KVERSIONFLAGS) > kversion.c

DEPFILES := $(wildcard *.kd)
ifneq ($(DEPFILES),)
include $(DEPFILES)
endif

always:
	@:
clean:
	-rm -f $(package).ko .$(package).ko.status
	-rm -f *.kd *.ko kelements.conf kelements.mk kpackage.cc kversion.c Kbuild
	-rm -f .*.o.cmd .*.ko.cmd $(package).mod.c $(package).mod.o $(package).o
	-rm -rf .tmp_versions

.PHONY: clean elemlist always