# Top-level Makefile

# Current development directory path

-include Makefile.opts

ifeq ($(MCU),)
$(error Must set 'MCU' in Makefile.opts; see 'BUILD' file)
endif

# Toolchain - Don't change this unless you are sure what you're doing!
TOOLCHAIN_CONFIG=toolchain-$(MCU_CORE).config
TOOLCHAIN_SRC_DIR=crosstool-ng
CROSS_DIR ?= ${HOME}/x-tools/arm-$(MCU_CORE)_v3a-eabi
CROSS_COMPILE ?= ${CROSS_DIR}/bin/arm-$(MCU_CORE)_v3a-eabi-
CC=$(CROSS_COMPILE)gcc
CXX=$(CROSS_COMPILE)g++
CPP=$(CROSS_COMPILE)cpp
LD=$(CROSS_COMPILE)gcc
OBJCOPY=$(CROSS_COMPILE)objcopy
AR=$(CROSS_COMPILE)gcc-ar
RANLIB=$(CROSS_COMPILE)gcc-ranlib
AS=$(CROSS_COMPILE)as
GDB=$(CROSS_COMPILE)gdb
SIZE=$(CROSS_COMPILE)size
NM=$(CROSS_COMPILE)nm
RM=rm
ECHO=echo
HOSTCC ?= gcc
MAKE ?= make

# How many processor cores we can use for builds
JLEVEL:=${shell cat /proc/cpuinfo |grep processor |wc -l}

# Libraries
LIBDIR=libs

# Generic CMSIS include:
MCU_INCLUDE += -I$(LIBDIR)/CMSIS/Include

# Compiler flags
CFLAGS += -pipe -Wall -Wextra -g -Os -std=c99 $(MCU_CFLAGS) $(TARGET_CFLAGS)
CXXFLAGS += -pipe -Wall -Wextra -g -Os -std=c++03 $(MCU_CXXFLAGS) $(TARGET_CXXFLAGS)
CPPFLAGS += $(MCU_INCLUDE) $(INCLUDE) $(MCU_CPPFLAGS) $(TARGET_CPPFLAGS)
LDCPPFLAGS += -DMCU=$(MCU) -DMCU_SUBTYPE=$(MCU_SUBTYPE) $(TARGET_LDCPPFLAGS)

# Linker Flags
LDFLAGS +=  -nostartfiles -fno-exceptions -ffunction-sections -fdata-sections -specs=nosys.specs

# Use LTO?
ifneq ($(USE_LTO),)
CFLAGS += -flto # -ffat-lto-objects
CXXFLAGS += -flto # -ffat-lto-objects
LDFLAGS += -fuse-linker-plugin -flto=$(JLEVEL) $(CFLAGS)
else
CFLAGS += -ffunction-sections
CXXFLAGS += -ffunction-sections
LDFLAGS += -fwhole-program
endif

# Try and pretty things up a bit.
Q=@
E=echo
ifeq ($(V), 1)
Q=
E=true
endif

# Now for the image definition
IMAGE = $(MCU)-main

# Initial Makefile targets
all: .toolchain version $(IMAGE).bin

.PHONY: clean libclean distclean version dep

.PRECIOUS: %.elf %.ld %.a

# Include library targets
include $(LIBDIR)/$(MCU).mk
include $(LIBDIR)/math.mk
include $(LIBDIR)/freertos.mk
# Include application targets
include src/build.mk

# Bookeeping
VERSION_H = inc/version.h
VERSION = `./git-version-gen /dev/null`

# Set up the libraries we need
LIBRARIES += $(LIBDIR)/lib$(MCU).a
LIBS_OBJS += $(MCU_LIBS_OBJS)

$(LIBDIR)/lib$(MCU).a: $(MCU_LIBS_OBJS)
	@$(E) "  AR " $@
	$(Q)$(AR) cr $@ $^

# Generic compilation rules
%.ld: libs/$(MCU).ld.in inc/$(MCU)_hw.h
	@$(E) "  GENERATE " $@
	$(Q)$(CPP) $(LDCPPFLAGS) -include inc/$(MCU)_hw.h libs/$(MCU).ld.in -P -o $@

%.bin: %.elf
	@$(E) "  OBJCOPY  " $@
	$(Q)$(OBJCOPY) -O binary $< --remove-section .note.gnu.build-id $@

# Dependency tracking
-include $(SRC_OBJS:.o=.d)
-include $(LIBS_OBJS:.o=.d)

%.o: %.c Makefile.opts $(VERSION_H)  # These last two are ... special
	@$(E) "  CC " $<
	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) -MM $< > $(@:.o=.dt)
	$(Q)sed -e 's|.*:|$*.o:|' < $*.dt > $*.d
	$(Q)sed -e 's/.*://' -e 's/\\$$//' < $*.dt | fmt -1 | sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
	@$(RM) -f $*.dt
	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@

%.o: %.cpp Makefile.opts $(VERSION_H)  # These last two are ... special
	@$(E) "  CX " $<
	$(Q)$(CXX) $(CXXFLAGS) $(CPPFLAGS) -MM $< > $(@:.o=.dt)
	$(Q)sed -e 's|.*:|$*.o:|' < $*.dt > $*.d
	$(Q)sed -e 's/.*://' -e 's/\\$$//' < $*.dt | fmt -1 | sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
	@$(RM) -f $*.dt
	$(Q)$(CC) $(CXXFLAGS) $(CPPFLAGS) -c $< -o $@

%.elf: %.ld $(LIBRARIES) $(PROGRAM_LIBS)
	@$(E) "  LINK     " $@
	$(Q)$(CC) -o $@ $(LDFLAGS) \
		-Wl,--gc-sections \
		-Wl,-T$(@:.elf=.ld) \
		-Wl,--no-whole-archive \
		$(PROGRAM_LIBS) $(LIBRARIES) \
		-Wl,--build-id=none \
		-Wl,-Map=$(@:.elf=.map)
	$(Q)$(SIZE) $@

cppcheck:
	cppcheck --std=c99 -q -v --enable=all $(CPPFLAGS) $(SRC_OBJS:.o=.c) $(LIBS_OBJS:.o=.c)

# Cleanup
clean:
	@$(E) "  CLEAN    "
	$(Q)$(RM) -f $(SRC_OBJS) src/*.a $(IMAGE).{bin,elf,ld,map}

libclean:
	@$(E) "  LIBCLEAN "
	$(Q)$(RM) -f $(LIBS_OBJS) $(LIBRARIES)

distclean: clean libclean
	@$(E) "  DISTCLEAN"
	$(Q)$(RM) -f $(DEPFILE) $(VERSION_H)
	$(Q)$(RM) -Rf $(TOOLCHAIN_SRC_DIR)/.build
	$(Q)if [ -r $(TOOLCHAIN_SRC_DIR)/Makefile ] ; then \
		cd $(TOOLCHAIN_SRC_DIR) ; \
		MAKELEVEL='' $(MAKE) clean ; \
		MAKELEVEL='' $(MAKE) distclean ; \
	fi
	@$(RM) -f .toolchain-$(MCU_CORE)
	$(Q)$(RM) -f tags TAGS

# Toolchain
.toolchain: .toolchain-$(MCU_CORE)

.toolchain-$(MCU_CORE):
	$(Q)if [ ! -x $(CROSS_COMPILE)gcc ] ; then  \
		( unset AS LD LDD CC CPP AR NM STRIP STRIPTOOL OBJCOPY OBJDUMP RANLIB LD_LIBRARY_PATH MAKELEVEL ; \
		if [ -r $(TOOLCHAIN_SRC_DIR)/$(TOOLCHAIN_CONFIG) ] ; then \
			cp $(TOOLCHAIN_SRC_DIR)/$(TOOLCHAIN_CONFIG) $(TOOLCHAIN_SRC_DIR)/.config ; \
		else \
			$(ECHO) "$(TOOLCHAIN_CONFIG) missing!  Exiting." ; \
			exit 1 ;\
		fi ; \
		$(RM) -Rf $(TOOLCHAIN_SRC_DIR)/.build ; \
		cd $(TOOLCHAIN_SRC_DIR) ; \
		./configure --enable-local && \
		$(MAKE) && \
		./ct-ng build ; \
		cd - ) ; \
	fi
	@if [ ! -x $(CROSS_COMPILE)gcc ] ; then \
		$(ECHO) "Toolchain Build failed!" ; \
		exit 1 ;\
	fi
	@touch .toolchain-$(MCU_CORE)

toolclean:
	$(Q)if [ -d $(CROSS_DIR) ] ; then \
		chmod -R +w $(CROSS_DIR) ; \
		$(RM) -fr $(CROSS_DIR) ; \
	fi
	@$(RM) -f .toolchain-$(MCU_CORE)

# For saner developers
tags:
	find . 	-path '*crosstool*' -prune \
		-o -name '*.[CHch]' -type f -print \
		| etags -

# Automagic version strings
version:
#	@$(E) " VERSION " $(VERSION_H)
	$(Q)./git-version-gen $(VERSION_H) $(APP) > /dev/null