Basic support for esp8266 platform

This includes empty stubs for most core Arduino functions.
Need to actually implement all those digital reads writes whatever.
Need to prebuild toolchains (xtensa-elf-lx106) for 3 platforms and put them on some download server.
Need to do the same with esptool.
Need to fix 0x40000 binary generation and add correct upload commands.
Maybe even implement uploads over WiFi.

platform.txt

@@ -0,0 +1,107 @@
+
+# Arduino ESP8266 platform
+# ------------------------------
+
+# For more info:
+# https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5---3rd-party-Hardware-specification
+
+name=Arduino ESP8266
+version=1.5.8
+
+compiler.tools.path={runtime.ide.path}/hardware/tools/esp8266/
+compiler.path={compiler.tools.path}/xtensa-lx106-elf/bin/
+compiler.sdk.path={compiler.tools.path}/sdk/
+
+compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH -I{compiler.sdk.path}/include
+
+compiler.c.cmd=xtensa-lx106-elf-gcc
+compiler.c.flags=-c -Os -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -MMD
+
+compiler.c.elf.ldscript={compiler.sdk.path}/ld/eagle.app.v6.ld
+compiler.c.elf.flags=-nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static -L{compiler.sdk.path}/lib -T{compiler.c.elf.ldscript}
+compiler.c.elf.cmd=xtensa-lx106-elf-gcc
+compiler.c.elf.libs=-lc -lgcc -lhal -lphy -lnet80211 -llwip -lwpa -lmain
+
+compiler.cpp.cmd=xtensa-lx106-elf-g++
+compiler.cpp.flags=-c -Os -mlongcalls -fno-exceptions -MMD
+
+compiler.ar.cmd=xtensa-lx106-elf-ar
+compiler.ar.flags=cru
+
+compiler.elf2hex.cmd=esptool
+
+compiler.elf2hex.flags=
+
+compiler.esptool.cmd=esptool
+
+# This can be overriden in boards.txt
+build.extra_flags=
+
+# These can be overridden in platform.local.txt
+compiler.c.extra_flags=
+compiler.c.elf.extra_flags=
+compiler.S.extra_flags=
+compiler.cpp.extra_flags=
+compiler.ar.extra_flags=
+compiler.objcopy.eep.extra_flags=
+compiler.elf2hex.extra_flags=
+
+## Compile c files
+recipe.c.o.pattern="{compiler.path}{compiler.c.cmd}" {compiler.cpreprocessor.flags} {compiler.c.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.c.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
+
+## Compile c++ files
+recipe.cpp.o.pattern="{compiler.path}{compiler.cpp.cmd}" {compiler.cpreprocessor.flags} {compiler.cpp.flags} -DF_CPU={build.f_cpu} -DARDUINO={runtime.ide.version} -DARDUINO_{build.board} -DARDUINO_ARCH_{build.arch} {compiler.cpp.extra_flags} {build.extra_flags} {includes} "{source_file}" -o "{object_file}"
+
+## Compile S files
+recipe.S.o.pattern=
+
+## Create archives
+recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/{archive_file}" "{object_file}"
+
+## Combine gc-sections, archives, and objects
+recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} {compiler.c.elf.extra_flags} -o "{build.path}/{build.project_name}.elf" -Wl,--start-group {object_files} "{build.path}/{archive_file}" {compiler.c.elf.libs} -Wl,--end-group "-L{build.path}" 
+
+## Create eeprom
+recipe.objcopy.eep.pattern=echo EEP
+
+## Create hex
+#recipe.objcopy.hex.pattern="{compiler.path}{compiler.elf2hex.cmd}" {compiler.elf2hex.flags} {compiler.elf2hex.extra_flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.hex"
+
+recipe.objcopy.hex.pattern={compiler.tools.path}{compiler.esptool.cmd} -eo "{build.path}/{build.project_name}.elf" -bo "{build.path}/{build.project_name}_00000.bin" -bs .text -bs .data -bs .rodata -bc -ec && {compiler.tools.path}{compiler.esptool.cmd}  -eo "{build.path}/{build.project_name}.elf" -es .irom0.text "{build.path}/{build.project_name}_40000.bin" -ec
+
+## Compute size
+#recipe.size.pattern="{compiler.path}{compiler.size.cmd}" -A "{build.path}/{build.project_name}.elf"
+recipe.size.pattern=
+recipe.size.regex=^(?:\.text|\.data|\.bootloader)\s+([0-9]+).*
+recipe.size.regex.data=^(?:\.data|\.bss|\.noinit)\s+([0-9]+).*
+recipe.size.regex.eeprom=^(?:\.eeprom)\s+([0-9]+).*
+
+
+# AVR Uploader/Programmers tools
+# ------------------------------
+
+tools.avrdude.cmd.path={runtime.ide.path}/hardware/tools/avr/bin/avrdude
+tools.avrdude.config.path={runtime.ide.path}/hardware/tools/avr/etc/avrdude.conf
+
+tools.avrdude.upload.params.verbose=-v
+tools.avrdude.upload.params.quiet=-q -q
+tools.avrdude.upload.pattern="{cmd.path}" "-C{config.path}" {upload.verbose} -p{build.mcu} -c{upload.protocol} -P{serial.port} -b{upload.speed} -D "-Uflash:w:{build.path}/{build.project_name}.hex:i"
+
+tools.avrdude.program.params.verbose=-v
+tools.avrdude.program.params.quiet=-q -q
+tools.avrdude.program.pattern="{cmd.path}" "-C{config.path}" {program.verbose} -p{build.mcu} -c{protocol} {program.extra_params} "-Uflash:w:{build.path}/{build.project_name}.hex:i"
+
+tools.avrdude.erase.params.verbose=-v
+tools.avrdude.erase.params.quiet=-q -q
+tools.avrdude.erase.pattern="{cmd.path}" "-C{config.path}" {erase.verbose} -p{build.mcu} -c{protocol} {program.extra_params} -e -Ulock:w:{bootloader.unlock_bits}:m -Uefuse:w:{bootloader.extended_fuses}:m -Uhfuse:w:{bootloader.high_fuses}:m -Ulfuse:w:{bootloader.low_fuses}:m
+
+tools.avrdude.bootloader.params.verbose=-v
+tools.avrdude.bootloader.params.quiet=-q -q
+tools.avrdude.bootloader.pattern="{cmd.path}" "-C{config.path}" {bootloader.verbose} -p{build.mcu} -c{protocol} {program.extra_params} "-Uflash:w:{runtime.platform.path}/bootloaders/{bootloader.file}:i" -Ulock:w:{bootloader.lock_bits}:m
+
+
+# USB Default Flags
+# Default blank usb manufacturer will be filled it at compile time
+# - from numeric vendor ID, set to Unknown otherwise
+build.usb_manufacturer=
+build.usb_flags=-DUSB_VID={build.vid} -DUSB_PID={build.pid} '-DUSB_MANUFACTURER={build.usb_manufacturer}' '-DUSB_PRODUCT={build.usb_product}'