########################################################################
#
# Pass1: Determine CROSS_COMPILE only.
#   We need CROSS_COMPILE in order to validate various KBUILD_CFLAGS
#   GCC CROSS_COMILE is needed in order to validate compiler options
#   via constructs such as:
#   KBUILD_CFLAGS += $(call cc-option,-option,)
#
# Pass2: Determine LIB_INCLUDE_DIR and TOOLCHAIN_CFLAGS.
#   Knowing KBUILD_CFLAGS, we can query GCC compiler for the location
#   of the libraries corresponding to the KBUILD_CFLAGS.
#
#######################################################################

REQUIRED_SDK_VER=0.8.2

ifndef ZEPHYR_SDK_INSTALL_DIR

$(error ZEPHYR_SDK_INSTALL_DIR is not set)
else
SDK_VERSION = $(shell cat ${ZEPHYR_SDK_INSTALL_DIR}/sdk_version)
SDK_CHECK = $(shell ${ZEPHYR_BASE}/scripts/vercomp $(REQUIRED_SDK_VER) $(SDK_VERSION) || echo $$?)

ifeq ($(SDK_CHECK),1)
$(error (The SDK version you are using is old, please update your SDK. You need at least SDK version $(REQUIRED_SDK_VER)))
endif
endif

ifeq ($(HOST_OS),MINGW)
	TOOLCHAIN_HOME = ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/i686-pokysdk-mingw32
else
	TOOLCHAIN_HOME = ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/i686-pokysdk-linux
endif

ifndef MAKEFILE_TOOLCHAIN_DO_PASS2

# arm (pass1)
CROSS_COMPILE_TARGET_arm = arm-poky-eabi
SYSROOT_TARGET_arm = armv5-poky-eabi
CROSS_COMPILE_arm=$(TOOLCHAIN_HOME)/usr/bin/$(CROSS_COMPILE_TARGET_arm)/$(CROSS_COMPILE_TARGET_arm)-

# arc (pass1)
CROSS_COMPILE_TARGET_arc = arc-poky-elf
SYSROOT_TARGET_arc = arc-poky-elf
CROSS_COMPILE_arc=$(TOOLCHAIN_HOME)/usr/bin/$(CROSS_COMPILE_TARGET_arc)/$(CROSS_COMPILE_TARGET_arc)-

# iamcu (pass1)
CROSS_COMPILE_TARGET_iamcu = i586-poky-elfiamcu
SYSROOT_TARGET_iamcu = iamcu-poky-elfiamcu
CROSS_COMPILE_iamcu=$(TOOLCHAIN_HOME)/usr/bin/iamcu-poky-elfiamcu/$(CROSS_COMPILE_TARGET_iamcu)-

# x86 (pass1)
CROSS_COMPILE_TARGET_x86 = i586-poky-elf
SYSROOT_TARGET_x86 = i586-poky-elf
CROSS_COMPILE_x86=$(TOOLCHAIN_HOME)/usr/bin/$(CROSS_COMPILE_TARGET_x86)/$(CROSS_COMPILE_TARGET_x86)-

# nios2 (pass1)
CROSS_COMPILE_TARGET_nios2 = nios2-poky-elf
SYSROOT_TARGET_nios2 = nios2-poky-elf
CROSS_COMPILE_nios2=$(TOOLCHAIN_HOME)/usr/bin/$(CROSS_COMPILE_TARGET_nios2)/$(CROSS_COMPILE_TARGET_nios2)-

else

# Test CONFIG_TOOLCHAIN_VARIANT value with surrounding quotes removed (if any)
ifneq ($(CONFIG_TOOLCHAIN_VARIANT:"%"=%),)
SYSROOT := ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/${SYSROOT_TARGET_$(subst $\",,${CONFIG_TOOLCHAIN_VARIANT})}
else
SYSROOT := ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/${SYSROOT_TARGET_${ARCH}}
endif

LIBGCC_DIR = $(shell dirname `$(CROSS_COMPILE)gcc --sysroot=$(SYSROOT) $(KBUILD_CFLAGS) -print-libgcc-file-name`)
NEWLIB_DIR = $(shell $(CROSS_COMPILE)gcc --sysroot=$(SYSROOT) $(KBUILD_CFLAGS) -print-multi-directory)
TOOLCHAIN_CFLAGS = -I $(SYSROOT)/usr/include
LIB_INCLUDE_DIR += -L $(LIBGCC_DIR) -L $(SYSROOT)/usr/lib/$(NEWLIB_DIR)
endif

ifneq ($(CONFIG_TOOLCHAIN_VARIANT:"%"=%),)
CROSS_COMPILE = $(CROSS_COMPILE_$(subst $\",,$(CONFIG_TOOLCHAIN_VARIANT)))
else
CROSS_COMPILE = $(CROSS_COMPILE_$(ARCH))
endif

QEMU_BIN_PATH ?= $(TOOLCHAIN_HOME)/usr/bin
QEMU_BIOS=$(TOOLCHAIN_HOME)/usr/share/qemu

TOOLCHAIN_LIBS = gcc

OPENOCD ?= ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/i686-pokysdk-linux/usr/bin/openocd
OPENOCD_DEFAULT_PATH ?= ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/i686-pokysdk-linux/usr/share/openocd/scripts

export LIB_INCLUDE_DIR CROSS_COMPILE TOOLCHAIN_LIBS QEMU_BIN_PATH QEMU TOOLCHAIN_CFLAGS OPENOCD OPENOCD_DEFAULT_PATH

ifndef MAKEFILE_TOOLCHAIN_DO_PASS2
MAKEFILE_TOOLCHAIN_DO_PASS2=true
endif