##
## Copyright (C) 2008 Advanced Micro Devices, Inc.
## Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de>
## Copyright 2012 Google Inc.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; version 2 of the License.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
##

.SECONDEXPANSION:

src = $(DC_SRC)
obj = $(DC_OBJ)

# Make is silent per default, but 'make V=1' will show all compiler calls.
ifneq ($(V),1)
Q:=@
.SILENT:
endif

$(if $(wildcard $(obj)/.xcompile),,$(eval $(shell $(src)/util/xcompile/xcompile $(XGCCPATH) > $(obj)/.xcompile)))

include $(obj)/.xcompile

# The default target placeholder. Default targets that do something should be
# made dependencies of this.
all:
.PHONY: all

include $(obj)/.config

export CC = $(firstword $(CC_$(TC_ARCH)))
OBJCOPY ?= $(OBJCOPY_$(TC_ARCH))
STRIP ?= $(STRIP_$(TC_ARCH))
LIBGCC ?= $(shell $(CC) -print-libgcc-file-name)
LZMA ?= lzma

tryccoption = \
	$(shell $(CC) $(1) -S -xc /dev/null -o /dev/null &> /dev/null; echo $$?)
tryldoption = \
	$(shell $(CC) $(1) -static -nostdlib -fuse-ld=bfd -xc /dev/null -o /dev/null &> /dev/null; echo $$?)

# There are no include dirs to start with, these will be filled in by included
# Makefiles. The double quotes around config options are removed by passing
# them through the shell one extra time.
INCLUDE_DIRS =
ABI_FLAGS = $(ARCH_ABI_FLAGS) -ffreestanding -fno-builtin \
	-fno-stack-protector -fomit-frame-pointer
LINK_FLAGS = $(ARCH_LINK_FLAGS) $(ABI_FLAGS) -fuse-ld=bfd -nostdlib \
	-Wl,--gc-sections -Wl,-Map=$@.map -static -Wl,--build-id=none \
	$(shell echo $(CONFIG_EXTRA_LINK_FLAGS))
CFLAGS = $(ARCH_CFLAGS) -Wall -Werror $(INCLUDE_DIRS) -include $(obj)/config.h \
	-std=gnu99 $(ABI_FLAGS) -ffunction-sections -fdata-sections \
	-ggdb3 -nostdinc -nostdlib -fno-stack-protector -fno-common \
	-MT $(@) -MMD -MP -MF $(@:.o=.Td) \
	$(shell echo $(CONFIG_EXTRA_CFLAGS))
POSTCOMPILE = mv -f $(@:.o=.Td) $(@:.o=.d)

ifneq ($(SOURCE_DEBUG),)
CFLAGS += -O0 -g
else
CFLAGS += -Os
endif


strip_quotes = $(subst ",,$(subst \",,$(1)))

# Add a new class of source/object files to the build system
add-class= \
	$(eval $(1)-srcs:=) \
	$(eval $(1)-objs:=) \
	$(eval classes+=$(1))

# Special classes are managed types with special behaviour
# On parse time, for each entry in variable $(1)-y
# a handler $(1)-handler is executed with the arguments:
# * $(1): directory the parser is in
# * $(2): current entry
add-special-class= \
	$(eval $(1):=) \
	$(eval special-classes+=$(1))

# Clean -y variables, include Makefile.inc
# Add paths to files in X-y to X-srcs
# Add subdirs-y to subdirs
includemakefiles= \
	$(foreach class,classes subdirs $(classes) $(special-classes), $(eval $(class)-y:=)) \
	$(eval -include $(1)) \
	$(foreach special,$(special-classes), \
		$(foreach item,$($(special)-y), \
			$(call $(special)-handler,$(dir $(1)),$(item)))) \
	$(foreach class,$(filter-out $(classes),$(classes-y)), \
		$(call add-class,$(class))) \
	$(foreach class,$(classes), \
		$(eval $(class)-srcs+= \
			$$(subst $(src)/,, \
			$$(abspath $$(subst $(dir $(1))/,/,$$(addprefix $(dir $(1)),$$($(class)-y))))))) \
	$(eval subdirs+=$$(subst $(CURDIR)/,,$$(abspath $$(addprefix $(dir $(1)),$$(subdirs-y)))))

# For each path in $(subdirs) call includemakefiles
# Repeat until subdirs is empty
evaluate_subdirs= \
	$(eval cursubdirs:=$(subdirs)) \
	$(eval subdirs:=) \
	$(foreach dir,$(cursubdirs), \
		$(eval cursrcdir:=$(dir)) \
		$(eval curobjdir:=$(patsubst src/%,$(obj)/%,$(dir))) \
		$(eval $(call includemakefiles,$(dir)/Makefile.inc)) \
	) \
	$(if $(subdirs),$(eval $(call evaluate_subdirs)))

# collect all object files eligible for building
subdirs:=$(src)
$(eval $(call evaluate_subdirs))

# Eliminate duplicate mentions of source files in a class
$(foreach class,$(classes),$(eval $(class)-srcs:=$(sort $($(class)-srcs))))

src-to-obj=$(addsuffix .$(1).o, $(basename $(patsubst src/%, $(obj)/%, $($(1)-srcs))))
$(foreach class,$(classes),$(eval $(class)-objs:=$(call src-to-obj,$(class))))

allsrcs:=$(foreach var, $(addsuffix -srcs,$(classes)), $($(var)))
allobjs:=$(foreach var, $(addsuffix -objs,$(classes)), $($(var)))
alldirs:=$(sort $(abspath $(dir $(allobjs))))

printall:
	@$(foreach class,$(classes),echo $(class)-objs:=$($(class)-objs); )
	@echo alldirs:=$(alldirs)
	@echo allsrcs=$(allsrcs)
	@echo DEPENDENCIES=$(DEPENDENCIES)
	@echo LIBGCC_FILE_NAME=$(LIBGCC_FILE_NAME)
	@$(foreach class,$(special-classes),echo $(class):='$($(class))'; )

ifndef NOMKDIR
$(shell mkdir -p $(obj) $(alldirs))
endif

# macro to define template macros that are used by use_template macro
define create_cc_template
# $1 obj class
# $2 source suffix (c, S)
# $3 additional compiler flags
# $4 additional dependencies
ifn$(EMPTY)def $(1)-objs_$(2)_template
de$(EMPTY)fine $(1)-objs_$(2)_template
$(obj)/$$(1).$(1).o: src/$$(1).$(2) $(KCONFIG_AUTOHEADER) $(4)
	@printf "    CC         $$$$(subst $$$$(obj)/,,$$$$(@))\n"
	$(Q)$(CC) $(3) -MMD $$$$(CFLAGS) -c -o $$$$@ $$$$<
	$$$$(POSTCOMPILE)
en$(EMPTY)def
end$(EMPTY)if
endef

filetypes-of-class=$(subst .,,$(sort $(suffix $($(1)-srcs))))
$(foreach class,$(classes), \
	$(foreach type,$(call filetypes-of-class,$(class)), \
		$(eval $(call create_cc_template,$(class),$(type),$($(class)-$(type)-ccopts),$($(class)-$(type)-deps)))))

foreach-src=$(foreach file,$($(1)-srcs),$(eval $(call $(1)-objs_$(subst .,,$(suffix $(file)))_template,$(subst src/,,$(basename $(file))))))
$(eval $(foreach class,$(classes),$(call foreach-src,$(class))))

DEPENDENCIES = $(allobjs:.o=.d)
-include $(DEPENDENCIES)