# Path to base directory for installed Xtensa SDK. This should be
# the parent directory of all the individual toolchain versions.
ifndef XTENSA_SDK
XTENSA_SDK := /opt/xtensa
endif
ifeq ($(wildcard $(XTENSA_SDK)),)
$(error Please set XTENSA_SDK to correct location of SDK path, not found in $(XTENSA_SDK))
endif

# List of paths to base directories for xtensa builds.  Can have multiple paths
# here; for example the base path for the installed xtensa SDK plus paths to
# vendor-supplied builds.  It's expected that each of these paths is a base
# directory with children of the form <toolchain version>/<build name>/ where
# the build name corresponds to CONFIG_SOC.  By default, we append all the
# builds included in the SDK
XTENSA_BUILD_PATHS += $(XTENSA_SDK)/XtDevTools/install/builds

# Legacy; make sure this is un-set. The compiler actually uses this value
# if set to find command line tools, and we would rather it automatically
# derive this.
ifneq ($(XTENSA_TOOLS_PATH),)
$(error Please leave XTENSA_TOOLS_PATH unset)
endif

ifeq (${CONFIG_XTENSA},y)

# Every Zephyr Xtensa SOC configuration should have CONFIG_SOC match the name
# of the build, and have CONFIG_TOOLCHAIN_VARIANT match the intended
# toolchain release.
TOOLCHAIN_VER = $(call unquote,$(CONFIG_TOOLCHAIN_VARIANT))
BUILD_NAME = $(call unquote,$(CONFIG_SOC))

# Attempt to find the canonical build directory using $(wildcard ..) to filter
# out potential build directories that don't exist
XCC_BUILD := $(strip $(foreach builddir,$(XTENSA_BUILD_PATHS),$(wildcard $(builddir)/$(TOOLCHAIN_VER)/$(BUILD_NAME))))

ifeq ($(XCC_BUILD),)
$(error Unable to find build $(BUILD_NAME) for $(TOOLCHAIN_VER) in $(XTENSA_BUILD_PATHS), you may need to set XTENSA_BUILD_PATHS)
endif

ifneq ($(words $(XCC_BUILD)),1)
$(error Multiple build matches for $(BUILD_NAME) on $(TOOLCHAIN_VER) in $(XCC_BUILD))
endif

# Strip quotes from cross compiler anme prefix
CROSS_COMPILE_xtensa = $(call unquote,$(CONFIG_CROSS_COMPILE))

ifeq (${CROSS_COMPILE_xtensa},)
    # Use default name prefix if no cross compiler name prefix is set
    CROSS_COMPILE_xtensa=xt-
endif


XCC_TOOLS := $(XTENSA_SDK)/XtDevTools/install/tools/$(TOOLCHAIN_VER)/XtensaTools
CROSS_COMPILE = ${XCC_TOOLS}/bin/$(CROSS_COMPILE_$(ARCH))

ifeq ($(KBUILD_VERBOSE),1)
$(info Using Xtensa tools located in $(XCC_TOOLS))
$(info Using Xtensa core build in $(XCC_BUILD))
endif

XCC_FLAGS := --xtensa-core=$(CONFIG_SOC)

ifeq ($(USE_CCACHE),1)
    CC = $(CCACHE) ${CROSS_COMPILE}xcc $(XCC_FLAGS)
    CXX = $(CCACHE) ${CROSS_COMPILE}xc++ $(XCC_FLAGS)
else
    CC = ${CROSS_COMPILE}xcc $(XCC_FLAGS)
    CXX = ${CROSS_COMPILE}xc++ $(XCC_FLAGS)
endif
AS = ${CROSS_COMPILE}as $(XCC_FLAGS)
LD = ${CROSS_COMPILE}ld $(XCC_FLAGS)
CROSS_COMPILE_TARGET = ${CROSS_COMPILE_TARGET_${ARCH}}

# Can either pass --xtensa-system to every single tool in the toolchain (and
# force redefinition of OBJCOPY, READELF, etc) or just export to environment
# (simpler)
XTENSA_SYSTEM := $(XCC_BUILD)/config

XTSC_INC = $(realpath $(call unquote,${CONFIG_XTENSA_XTSC_INC}))
ifeq (${XTSC_INC},)
XTSC_INC = $(realpath ../$(call unquote,${CONFIG_XTENSA_XTSC_INC}))
endif
XTSC_WORK_DIR = $(dir ${XTSC_INC})
XTSC_INC_FILE = $(notdir ${XTSC_INC})

# Include XCC standard libraries so that users used to Xplorer IDE can port
# their code easily
TOOLCHAIN_LIBS += gcc hal
LIB_INCLUDE_DIR += -L${XCC_BUILD}/xtensa-elf/lib/xcc \
                   -L${XCC_BUILD}/xtensa-elf/lib \
                   -L${XCC_BUILD}/xtensa-elf/arch/lib

KBUILD_CPPFLAGS += -I$(XCC_TOOLS)/lib/xcc/include \
                   -I$(XCC_TOOLS)/xtensa-elf/include \
                   -I${XCC_BUILD}/xtensa-elf/arch/include \
                   -I${XCC_BUILD}/xtensa-elf/include \
                   -D'__builtin_unreachable()=while(1);'

# xt-xcc does not support -Og, replace with -O0
KBUILD_CFLAGS_OPTIMIZE:=$(patsubst -Og,-O0,${KBUILD_CFLAGS_OPTIMIZE})
KBUILD_CXXFLAGS:=$(filter-out \
			-std=c++11 \
			-fno-reorder-functions \
			-fno-asynchronous-unwind-tables \
			-fno-defer-pop \
			-Wno-unused-but-set-variable \
			-fno-omit-frame-pointer \
			,${KBUILD_CXXFLAGS})

# Support for Xtensa simulator from Cadence Design Systems, Inc.
XTRUN = ${CROSS_COMPILE}run
XTRUN_FLAGS += --turbo --cc_none

export CROSS_COMPILE XTENSA_SYSTEM LIB_INCLUDE_DIR XCC_TOOLS
endif # CONFIG_XTENSA