############################################################################
#
# Copyright (c) 2015 PX4 Development Team. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name PX4 nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################

#=============================================================================
#
#	Defined functions in this file
#
# 	OS Specific Functions
#
#		* px4_posix_add_firmware
#		* px4_posix_generate_builtin_commands
#		* px4_posix_add_export
#		* px4_posix_generate_romfs
#
# 	Required OS Interface Functions
#
# 		* px4_os_add_flags
#		* px4_os_prebuild_targets
#

include(common/px4_base)
list(APPEND CMAKE_MODULE_PATH ${PX4_SOURCE_DIR}/cmake/posix)

#=============================================================================
#
#	px4_posix_generate_builtin_commands
#
#	This function generates the builtin_commands.c src for posix
#
#	Usage:
#		px4_posix_generate_builtin_commands(
#			MODULE_LIST <in-list>
#			OUT <file>)
#
#	Input:
#		MODULE_LIST	: list of modules
#
#	Output:
#		OUT	: stem of generated apps.cpp/apps.h ("apps")
#
#	Example:
#		px4_posix_generate_builtin_commands(
#			OUT <generated-src> MODULE_LIST px4_simple_app)
#
function(px4_posix_generate_builtin_commands)
	px4_parse_function_args(
		NAME px4_posix_generate_builtin_commands
		ONE_VALUE OUT
		MULTI_VALUE MODULE_LIST
		REQUIRED MODULE_LIST OUT
		ARGN ${ARGN})
	set(builtin_apps_string)
	set(builtin_apps_decl_string)
	set(command_count 0)
	foreach(module ${MODULE_LIST})
		# default
		set(MAIN_DEFAULT MAIN-NOTFOUND)
		set(STACK_DEFAULT 1024)
		set(PRIORITY_DEFAULT SCHED_PRIORITY_DEFAULT)
		foreach(property MAIN STACK PRIORITY)
			get_target_property(${property} ${module} ${property})
			if(NOT ${property})
				set(${property} ${${property}_DEFAULT})
			endif()
		endforeach()
		if (MAIN)
			set(builtin_apps_string
				"${builtin_apps_string}\tapps[\"${MAIN}\"] = ${MAIN}_main;\n")
			set(builtin_apps_decl_string
				"${builtin_apps_decl_string}int ${MAIN}_main(int argc, char *argv[]);\n")
			math(EXPR command_count "${command_count}+1")
		endif()
	endforeach()
	configure_file(${PX4_SOURCE_DIR}/src/platforms/apps.cpp.in
		${OUT}.cpp)
	configure_file(${PX4_SOURCE_DIR}/src/platforms/apps.h.in
		${OUT}.h)
endfunction()

#=============================================================================
#
#	px4_os_add_flags
#
#	Set the posix build flags.
#
#	Usage:
#		px4_os_add_flags(
#			C_FLAGS <inout-variable>
#			CXX_FLAGS <inout-variable>
#			OPTIMIZATION_FLAGS <inout-variable>
#			EXE_LINKER_FLAGS <inout-variable>
#			INCLUDE_DIRS <inout-variable>
#			LINK_DIRS <inout-variable>
#			DEFINITIONS <inout-variable>)
#
#	Input:
#		BOARD					: flags depend on board/posix config
#
#	Input/Output: (appends to existing variable)
#		C_FLAGS					: c compile flags variable
#		CXX_FLAGS				: c++ compile flags variable
#		OPTIMIZATION_FLAGS			: optimization compile flags variable
#		EXE_LINKER_FLAGS			: executable linker flags variable
#		INCLUDE_DIRS				: include directories
#		LINK_DIRS				: link directories
#		DEFINITIONS				: definitions
#
#	Note that EXE_LINKER_FLAGS is not suitable for adding libraries because
#	these flags are added before any of the object files and static libraries.
#	Add libraries in src/firmware/posix/CMakeLists.txt.
#
#	Example:
#		px4_os_add_flags(
#			C_FLAGS CMAKE_C_FLAGS
#			CXX_FLAGS CMAKE_CXX_FLAGS
#			OPTIMIZATION_FLAGS optimization_flags
#			EXE_LINKER_FLAG CMAKE_EXE_LINKER_FLAGS
#			INCLUDES <list>)
#
function(px4_os_add_flags)

	set(inout_vars
		C_FLAGS CXX_FLAGS OPTIMIZATION_FLAGS EXE_LINKER_FLAGS INCLUDE_DIRS LINK_DIRS DEFINITIONS)

	px4_parse_function_args(
		NAME px4_os_add_flags
		ONE_VALUE ${inout_vars} BOARD
		REQUIRED ${inout_vars} BOARD
		ARGN ${ARGN})

	px4_add_common_flags(
		BOARD ${BOARD}
		C_FLAGS ${C_FLAGS}
		CXX_FLAGS ${CXX_FLAGS}
		OPTIMIZATION_FLAGS ${OPTIMIZATION_FLAGS}
		EXE_LINKER_FLAGS ${EXE_LINKER_FLAGS}
		INCLUDE_DIRS ${INCLUDE_DIRS}
		LINK_DIRS ${LINK_DIRS}
		DEFINITIONS ${DEFINITIONS})

        set(PX4_BASE )
        set(added_include_dirs
		src/modules/systemlib
                src/platforms/posix/include
                mavlink/include/mavlink
                )

# This block sets added_definitions and added_cxx_flags.
if(UNIX AND APPLE)
        set(added_definitions
		-D__PX4_POSIX
		-D__PX4_DARWIN
		-D__DF_DARWIN
		-Dnoreturn_function=__attribute__\(\(noreturn\)\)
                )

	set(added_cxx_flags)

	if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
		message(FATAL_ERROR "PX4 Firmware requires XCode 8 or newer on Mac OS. Version installed on this system: ${CMAKE_CXX_COMPILER_VERSION}")
	endif()

	EXEC_PROGRAM(uname ARGS -v  OUTPUT_VARIABLE DARWIN_VERSION)
	STRING(REGEX MATCH "[0-9]+" DARWIN_VERSION ${DARWIN_VERSION})
	# message(STATUS "PX4 Darwin Version: ${DARWIN_VERSION}")
	if (DARWIN_VERSION LESS 16)
		list(APPEND added_definitions
			-DCLOCK_MONOTONIC=1
			-DCLOCK_REALTIME=0
			-D__PX4_APPLE_LEGACY
			)
	endif()

else()

        set(added_definitions
		-D__PX4_POSIX
		-D__PX4_LINUX
		-D__DF_LINUX
		-Dnoreturn_function=__attribute__\(\(noreturn\)\)
                )

	# Use -pthread For linux/g++.
	set(added_cxx_flags
		-pthread
		)

endif()

set(added_exe_linker_flags)

# This block sets added_c_flags (appends to others).
if ("${BOARD}" STREQUAL "eagle")

	if ("$ENV{HEXAGON_ARM_SYSROOT}" STREQUAL "")
		message(FATAL_ERROR "HEXAGON_ARM_SYSROOT not set")
	else()
		set(HEXAGON_ARM_SYSROOT $ENV{HEXAGON_ARM_SYSROOT})
	endif()

	# Add the toolchain specific flags
        set(added_cflags ${POSIX_CMAKE_C_FLAGS} --sysroot=${HEXAGON_ARM_SYSROOT})

	list(APPEND added_cxx_flags
		${POSIX_CMAKE_CXX_FLAGS}
		--sysroot=${HEXAGON_ARM_SYSROOT}
		)

	list(APPEND added_exe_linker_flags
		-Wl,-rpath-link,${HEXAGON_ARM_SYSROOT}/usr/lib
		-Wl,-rpath-link,${HEXAGON_ARM_SYSROOT}/lib
		--sysroot=${HEXAGON_ARM_SYSROOT}
		)
# This block sets added_c_flags (appends to others).
elseif ("${BOARD}" STREQUAL "excelsior")

	if ("$ENV{HEXAGON_ARM_SYSROOT}" STREQUAL "")
		message(FATAL_ERROR "HEXAGON_ARM_SYSROOT not set")
	else()
		set(HEXAGON_ARM_SYSROOT $ENV{HEXAGON_ARM_SYSROOT})
	endif()

	# Add the toolchain specific flags

        set(added_cflags ${POSIX_CMAKE_C_FLAGS} --sysroot=${HEXAGON_ARM_SYSROOT}/lib32-apq8096  -mfloat-abi=softfp -mfpu=neon -mthumb-interwork)

	list(APPEND added_cxx_flags
		${POSIX_CMAKE_CXX_FLAGS}
		--sysroot=${HEXAGON_ARM_SYSROOT}/lib32-apq8096  -mfloat-abi=softfp -mfpu=neon -mthumb-interwork

		)

	list(APPEND added_exe_linker_flags
		-Wl,-rpath-link,${HEXAGON_ARM_SYSROOT}/lib32-apq8096/usr/lib
		-Wl,-rpath-link,${HEXAGON_ARM_SYSROOT}/lib32-apq8096/lib

		--sysroot=${HEXAGON_ARM_SYSROOT}/lib32-apq8096  -mfloat-abi=softfp -mfpu=neon -mthumb-interwork

		)
elseif ("${BOARD}" STREQUAL "rpi")
	SET(RPI_COMPILE_FLAGS
		-mcpu=cortex-a53
		-mfpu=neon
		-mfloat-abi=hard
	)
	LIST(APPEND added_c_flags ${RPI_COMPILE_FLAGS})
	LIST(APPEND added_cxx_flags ${RPI_COMPILE_FLAGS})

	FIND_PROGRAM(CXX_COMPILER_PATH ${CMAKE_CXX_COMPILER})

	GET_FILENAME_COMPONENT(CXX_COMPILER_PATH ${CXX_COMPILER_PATH} DIRECTORY)
	GET_FILENAME_COMPONENT(CXX_COMPILER_PATH "${CXX_COMPILER_PATH}/../" ABSOLUTE)

	IF ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
		set(CLANG_COMPILE_FLAGS
			--target=arm-pc-linux-gnueabihf
			-ccc-gcc-name arm-linux-gnueabihf-gcc
			--sysroot=${CXX_COMPILER_PATH}/arm-linux-gnueabihf/libc
			-I${CXX_COMPILER_PATH}/arm-linux-gnueabihf/libc/usr/include/
		)

		set(added_c_flags ${POSIX_CMAKE_C_FLAGS} ${CLANG_COMPILE_FLAGS})
		list(APPEND added_cxx_flags ${POSIX_CMAKE_CXX_FLAGS} ${CLANG_COMPILE_FLAGS})
		list(APPEND added_exe_linker_flags ${POSIX_CMAKE_EXE_LINKER_FLAGS} ${CLANG_COMPILE_FLAGS}
			-B${CXX_COMPILER_PATH}/arm-linux-gnueabihf/libc/usr/lib
			-L${CXX_COMPILER_PATH}/arm-linux-gnueabihf/libc/usr/lib
		)
	ENDIF()
else()
endif()

	# output
	foreach(var ${inout_vars})
		string(TOLOWER ${var} lower_var)
		#message(STATUS "posix: set(${${var}} ${${${var}}} ${added_${lower_var}} PARENT_SCOPE)")
		set(${${var}} ${${${var}}} ${added_${lower_var}} PARENT_SCOPE)
	endforeach()

endfunction()

#=============================================================================
#
#	px4_os_prebuild_targets
#
#	This function generates os dependent targets
#
#	Usage:
#		px4_os_prebuild_targets(
#			OUT <out-list_of_targets>
#			BOARD <in-string>
#			)
#
#	Input:
#		BOARD 		: board
#		THREADS 	: number of threads for building
#
#	Output:
#		OUT	: the target list
#
#	Example:
#		px4_os_prebuild_targets(OUT target_list BOARD px4fmu-v2)
#
function(px4_os_prebuild_targets)
	px4_parse_function_args(
			NAME px4_os_prebuild_targets
			ONE_VALUE OUT BOARD THREADS
			REQUIRED OUT BOARD
			ARGN ${ARGN})
	add_custom_target(${OUT})
endfunction()