#install dependencies brew tap homebrew/dupes brew install binutils coreutils automake wget gawk libtool gperf gnu-sed --with-default-names grep export PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"

#prepare case-sensitive disk sudo hdiutil create ~/Documents/case-sensitive.dmg -volname "case-sensitive" -size 10g -fs "Case-sensitive HFS+" sudo hdiutil mount ~/Documents/case-sensitive.dmg

#create symbolic link to /esp8266 sudo ln -s /Volumes/case-sensitive /esp8266 cd /esp8266

#install esp-open-sdk git clone --recursive https://github.com/pfalcon/esp-open-sdk.git --verbose make sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-blocking.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-clast-to-gimple.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-dependences.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-interchange.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-optimize-isl.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-poly.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-scop-detection.c sed -i '1s/^/#include <stddef.h>\n/' crosstool-NG/.build/src/gcc-4.8.2/gcc/graphite-sese-to-poly.c

sample Makefile

FW_FILE_1:=0x00000.bin
FW_FILE_2:=0x40000.bin
TARGET_OUT:=image.elf
all : $(TARGET_OUT) $(FW_FILE_1) $(FW_FILE_2)


SRCS:=driver/uart.c \
    common/http.c \
    common/mystuff.c \
    common/flash_rewriter.c \
    common/commonservices.c \
    common/http_custom.c \
    common/mdns.c \
    common/mfs.c \
    user/custom_commands.c \
    user/ntsc_broadcast.c \
    user/user_main.c \
    user/3d.c \
    tablemaker/broadcast_tables.c \
    tablemaker/CbTable.c

GCC_FOLDER:=/esp8266/esp-open-sdk/xtensa-lx106-elf
ESPTOOL_PY:=/esp8266/esp-open-sdk/esptool/esptool.py
FW_TOOL:=/esp8266/esp-open-sdk/other/esptool/esptool
SDK:=/esp8266/esp-open-sdk/esp_iot_sdk_v1.5.0
PORT:=/dev/ttyUSB0
#PORT:=/dev/ttyACM0

XTLIB:=$(SDK)/lib
XTGCCLIB:=$(GCC_FOLDER)/lib/gcc/xtensa-lx106-elf/4.8.2/libgcc.a
FOLDERPREFIX:=$(GCC_FOLDER)/bin
PREFIX:=$(FOLDERPREFIX)/xtensa-lx106-elf-
CC:=$(PREFIX)gcc

CFLAGS:=-mlongcalls -I$(SDK)/include -Imyclib -Iinclude -Iuser -Os -I$(SDK)/include/ -Icommon -DICACHE_FLASH

#   -Wl,--gc-sections \
#   -Wl,--relax  \
#   -flto \

LDFLAGS_CORE:=\
    -nostdlib \
    -L$(XTLIB) \
    -L$(XTGCCLIB) \
    -g \
    $(SDK)/lib/libmain.a \
    $(SDK)/lib/libpp.a \
    $(SDK)/lib/libnet80211.a \
    $(SDK)/lib/libwpa.a \
    $(SDK)/lib/liblwip.a \
    $(SDK)/lib/libssl.a \
    $(SDK)/lib/libupgrade.a \
    $(SDK)/lib/libnet80211.a \
    $(SDK)/lib/liblwip.a \
    $(SDK)/lib/libphy.a \
    $(SDK)/lib/libcrypto.a \
    $(XTGCCLIB) \
    -T $(SDK)/ld/eagle.app.v6.ld

LINKFLAGS:= \
    $(LDFLAGS_CORE) \
    -B$(XTLIB)

#image.elf : $(OBJS)
#   $(PREFIX)ld $^ $(LDFLAGS) -o $@

$(TARGET_OUT) : $(SRCS)
    $(PREFIX)gcc $(CFLAGS) $^  $(LINKFLAGS) -o $@
    xtensa-lx106-elf-nm -S -n $(TARGET_OUT) > image.map
    $(PREFIX)objdump -S $@ > image.lst

$(FW_FILE_1): $(TARGET_OUT)
    @echo "FW $@"
    $(FW_TOOL) -eo $(TARGET_OUT) -bo $@ -bs .text -bs .data -bs .rodata -bc -ec

$(FW_FILE_2): $(TARGET_OUT)
    @echo "FW $@"
    $(FW_TOOL) -eo $(TARGET_OUT) -es .irom0.text $@ -ec

burn : $(FW_FILE_1) $(FW_FILE_2)
    ($(ESPTOOL_PY) --port $(PORT) write_flash 0x00000 0x00000.bin 0x40000 0x40000.bin)||(true)

#If you have space, MFS should live at 0x100000, if you don't it can also live at
#0x10000.  But, then it is limited to 180kB.  You might need to do this if you have a 512kB 
#ESP variant.

burnweb : web/page.mpfs
    ($(ESPTOOL_PY) --port $(PORT) write_flash 0x10000 web/page.mpfs)||(true)


IP?=192.168.4.1

netburn : image.elf $(FW_FILE_1) $(FW_FILE_2)
    web/execute_reflash $(IP) 0x00000.bin 0x40000.bin

clean :
    rm -rf user/*.o driver/*.o $(TARGET_OUT) $(FW_FILE_1) $(FW_FILE_2)