# Hey Emacs, this is a -*- makefile -*-

# Set up a default target in case the user didn't already have one.
# "all" means to build .bin for all defined targets for the currently-defined board
all: $(addsuffix _$(BOARD).bin, $(TARGETS) $(TARGETS_WITH_ROM_VARS))
.PHONY: all

# Pretty print output.  Use "make Q=" to see full commands
Q ?= @
define pretty
  @printf "%8s %s\n" "$1" "$2"
endef

# Don't delete intermediate targets
.SECONDARY:

#####
# Tools and flags

# Set up cross compiler and toolchain definitions.
CROSS_COMPILE ?= arm-linux-
AS	= $(CROSS_COMPILE)as
LD	= $(CROSS_COMPILE)ld
CC	= $(CROSS_COMPILE)gcc
CPP	= $(CC) -E
AR	= $(CROSS_COMPILE)ar
NM	= $(CROSS_COMPILE)nm
STRIP	= $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
RANLIB	= $(CROSS_COMPILE)ranlib

# Build CFLAGS and prepend it to user-supplied CFLAGS
CFLAGS_PLAT  ?= -march=armv4t -mtune=arm7tdmi-s -mlong-calls -msoft-float \
		-mthumb-interwork -fno-strict-aliasing -fno-common -ffixed-r8 \
		-ffunction-sections -ffreestanding -fno-builtin
CFLAGS_WARN  ?= -Wcast-align -Wall -Wstrict-prototypes -Wextra 
CFLAGS_OPT   ?= -Os
CFLAGS_DEBUG ?= -g -DDEBUG -Werror
CFLAGS_MISC  ?= -pipe
CFLAGS := $(CFLAGS_PLAT) $(CFLAGS_WARN) $(CFLAGS_OPT) $(CFLAGS_DEBUG) $(CFLAGS_MISC) $(CFLAGS)

# Thumb flags, used for building most objects
CFLAGS_THUMB ?= -mthumb -mcallee-super-interworking

# Linker flags
LINKERSCRIPT ?= $(MC1322X)/mc1322x.lds
LDFLAGS      ?= -T $(LINKERSCRIPT) -nostartfiles -static -export-dynamic -u_start -Wl,-Map=$(@:.elf=.map)

# Assembler flags
AFLAGS       ?= -Wa,-gstabs $(CFLAGS)

# Misc tool options
OBJCOPYFLAGS ?= --gap-fill=0xff
ARFLAGS      = cr

#####

include $(MC1322X)/board/Makefile.board
include $(MC1322X)/lib/Makefile.lib
include $(MC1322X)/src/Makefile.src

#####
# Rule for building ELF files.  We use both a wildcard rule that links
# $(SRCLIB) as well as target-specific rules that link $(SRCLIB_ROMVARS)

# Normal targets (wildcard rule):
%_$(BOARD).elf: $(OBJDIR)/%.o $(TARGET_OBJ) $(SRCLIB)
	$(call pretty,LINK,$@)
	$Q$(CC) $(LDFLAGS) -o $@ -Wl,--start-group $^ -lm -Wl,--end-group

# Targets that need space for rom variables:
define build_elf_rule
$(1)_$$(BOARD).elf: $$(OBJDIR)/$(1).o $$(TARGET_OBJ) $$(SRCLIB_ROMVARS)
	$$(call pretty,LINK (romvars),$$@)
	$$Q$$(CC) $$(LDFLAGS) -o $$@ -Wl,--start-group $$^ -lm -Wl,--end-group
endef
$(foreach t, $(TARGETS_WITH_ROM_VARS), $(eval $(call build_elf_rule,$(t))))


# Generic rules
%.srec: %.elf
	$(call pretty,OBJCOPY,$@)
	$Q$(OBJCOPY) $(OBJCOPYFLAGS) -O srec $< $@

%.ihex: %.elf
	$(call pretty,OBJCOPY,$@)
	$Q$(OBJCOPY) $(OBJCOPYFLAGS) -O ihex $< $@

%.bin: %.elf
	$(call pretty,OBJCOPY,$@)
	$Q$(OBJCOPY) $(OBJCOPYFLAGS) -O binary $< $@

%.dis: %.elf
	$(call pretty,OBJDUMP,$@)
	$Q$(OBJDUMP) -Sd $< > $@ || rm -f $@

%.dis: %.o
	$(call pretty,OBJDUMP,$@)
	$Q$(OBJDUMP) -d $< > $@ || rm -f $@

%.o: %.c $(FORCE_C_DEPENDS)
	$(call pretty,CC,$@)
	$Q$(CC) $(CFLAGS) $(CFLAGS_THUMB) -MMD -c -o $@ $<
	@$(FINALIZE_DEPENDENCY)

%.o: %.S
	$(call pretty,AS,$@)
	$Q$(CC) $(AFLAGS) -MMD -c -o $@ $<
	@$(FINALIZE_DEPENDENCY)

(%): %
	$(call pretty,AR,$@($<))
	@$(AR) $(ARFLAGS) $@ $<

# Fix the dependencies generated for a particular target .o
# See http://make.paulandlesley.org/autodep.html#advanced
define FINALIZE_DEPENDENCY
  cp $(@:.o=.d) $(@:.o=.$$$$); \
  sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
      -e '/^$$/ d' -e 's/$$/ :/' < $(@:.o=.$$$$) >> $(@:.o=.d); \
  rm -f $(@:.o=.$$$$)
endef

clean::
	rm -f *.{o,d,a,bin,elf,ihex,srec,dis,map,bak} *~

.PHONY: clean

##############################

# If no single board was specified, invoke make recursively for each
# board in $(BOARDS), or $(ALL_BOARDS) if that wasn't specified either.
# This is at the end so that it can override all other targets.
ifndef BOARD
ifneq ($(MAKECMDGOALS),clean)
.DEFAULT_GOAL=mc1322x-default
BOARDS ?= $(ALL_BOARDS)
define build_board
	@echo "Building for board: $(1)"
	@$(MAKE) --no-print-directory BOARD=$(1) $(2)

endef
$(MAKECMDGOALS):
	$(foreach b, $(BOARDS), $(call build_board,$(b),$@))
mc1322x-default:
	$(foreach b, $(BOARDS), $(call build_board,$(b),))
endif
endif