TOP=$(PWD)
TOOLCHAIN=$(TOP)/xtensa-lx106-elf
VENDOR_SDK = 0.9.3

VENDOR_SDK_ZIP = $(VENDOR_SDK_ZIP_$(VENDOR_SDK))
VENDOR_SDK_DIR = $(VENDOR_SDK_DIR_$(VENDOR_SDK))

VENDOR_SDK_ZIP_0.9.3=esp_iot_sdk_v0.9.3_14_11_21.zip
VENDOR_SDK_DIR_0.9.3=esp_iot_sdk_v0.9.3
VENDOR_SDK_ZIP_0.9.2=esp_iot_sdk_v0.9.2_14_10_24.zip
VENDOR_SDK_DIR_0.9.2=esp_iot_sdk_v0.9.2
STANDALONE=y

.PHONY: crosstool-NG toolchain libhal libcirom sdk

all: esptool libcirom standalone sdk sdk_patch $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/lib/libhal.a $(TOOLCHAIN)/bin/xtensa-lx106-elf-gcc
	@echo
	@echo "Xtensa toolchain is built, to use it:"
	@echo
	@echo 'export PATH=$(TOOLCHAIN)/bin:$$PATH'
	@echo
ifneq ($(STANDALONE),y)
	@echo "Espressif ESP8266 SDK is installed. Toolchain contains only Open Source components"
	@echo "To link external proprietary libraries add:"
	@echo
	@echo "xtensa-lx106-elf-gcc -I$(TOP)/sdk/include -L$(TOP)/sdk/lib"
	@echo
else
	@echo "Espressif ESP8266 SDK is installed, its libraries and headers are merged with the toolchain"
	@echo
endif

esptool: toolchain
	cp esptool/esptool.py $(TOOLCHAIN)/bin/

$(TOOLCHAIN)/xtensa-lx106-elf/sysroot/lib/libcirom.a: $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/lib/libc.a toolchain
	@echo "Creating irom version of libc..."
	$(TOOLCHAIN)/bin/xtensa-lx106-elf-objcopy --rename-section .text=.irom0.text \
		--rename-section .literal=.irom0.literal $(<) $(@);

libcirom: $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/lib/libcirom.a

sdk_patch: .sdk_patch_$(VENDOR_SDK)

.sdk_patch_0.9.3: esp_iot_sdk_v0.9.3_14_11_21_patch1.zip esp_iot_sdk_v0.9.3/.dir
	unzip -o $<
	@touch $@

.sdk_patch_0.9.2: FRM_ERR_PATCH.rar esp_iot_sdk_v0.9.2/.dir 
	unrar x -o+ $<
	cp FRM_ERR_PATCH/*.a $(VENDOR_SDK_DIR)/lib/
	@touch $@

standalone: sdk sdk_patch toolchain
ifeq ($(STANDALONE),y)
	@echo "Installing vendor SDK headers into toolchain sysroot"
	@cp -Rf sdk/include/* $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/include/
	@echo "Installing vendor SDK libs into toolchain sysroot"
	@cp -Rf sdk/lib/* $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/lib/
	@echo "Installing vendor SDK linker scripts into toolchain sysroot"
	@sed -e 's/\r//' sdk/ld/eagle.app.v6.ld | sed -e s@../ld/@@ >$(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/lib/eagle.app.v6.ld
	@sed -e 's/\r//' sdk/ld/eagle.rom.addr.v6.ld >$(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/lib/eagle.rom.addr.v6.ld
endif

FRM_ERR_PATCH.rar:
	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=10"
esp_iot_sdk_v0.9.3_14_11_21_patch1.zip:
	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=73"

sdk: $(VENDOR_SDK_DIR)/.dir
	ln -snf $(VENDOR_SDK_DIR) sdk

$(VENDOR_SDK_DIR)/.dir: $(VENDOR_SDK_ZIP)
	unzip -o $^
	touch $@

esp_iot_sdk_v0.9.3_14_11_21.zip:
	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=72"

esp_iot_sdk_v0.9.2_14_10_24.zip:
	wget --content-disposition "http://bbs.espressif.com/download/file.php?id=9"

libhal: $(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/lib/libhal.a

$(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr/lib/libhal.a: $(TOOLCHAIN)/bin/xtensa-lx106-elf-gcc
	make -C lx106-hal -f ../Makefile _libhal

_libhal:
	autoreconf -i
	PATH=$(TOOLCHAIN)/bin:$(PATH) ./configure --host=xtensa-lx106-elf --prefix=$(TOOLCHAIN)/xtensa-lx106-elf/sysroot/usr
	PATH=$(TOOLCHAIN)/bin:$(PATH) make
	PATH=$(TOOLCHAIN)/bin:$(PATH) make install


toolchain: $(TOOLCHAIN)/bin/xtensa-lx106-elf-gcc

$(TOOLCHAIN)/bin/xtensa-lx106-elf-gcc: crosstool-NG/ct-ng
	make -C crosstool-NG -f ../Makefile _toolchain

_toolchain:
	./ct-ng xtensa-lx106-elf
	sed -r -i.org s%CT_PREFIX_DIR=.*%CT_PREFIX_DIR="$(TOOLCHAIN)"% .config
	sed -r -i s%CT_INSTALL_DIR_RO=y%"#"CT_INSTALL_DIR_RO=y% .config
	cat ../crosstool-config-overrides >> .config
	./ct-ng build


crosstool-NG: crosstool-NG/ct-ng

crosstool-NG/ct-ng: crosstool-NG/bootstrap
	make -C crosstool-NG -f ../Makefile _ct-ng

_ct-ng:
	./bootstrap
	./configure --prefix=`pwd`
	make MAKELEVEL=0
	make install MAKELEVEL=0

crosstool-NG/bootstrap:
	@echo "You cloned without --recursive, fetching submodules for you."
	git submodule update --init --recursive


clean:
	make -C crosstool-NG clean MAKELEVEL=0
	-rm -rf $(TOOLCHAIN)
	-rm -rf $(shell readlink sdk)
	-rm -f sdk