CMakeLists.txt

############################################################################
#
# Copyright (c) 2017 - 2019 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.
#
############################################################################

#=============================================================================
# CMAKE CODING STANDARD FOR PX4
#
# Structure
# ---------------------------------------------------------------------------
#
# * Common functions should be included in px_base.cmake.
#
# * OS/ board specific fucntions should be include in
#	px_impl_${PX4_PLATFORM}.cmake or px4_impl_${PX4_PLATFORM}_${PX4_BOARD}.cmake.
#
# Formatting
# ---------------------------------------------------------------------------
#
# * Use hard indents to match the px4 source code.
#
# * All function and script arguments are upper case.
#
# * All local variables are lower case.
#
# * All cmake functions are lowercase.
#
# * For else, endif, endfunction, etc, never put the name of the statement
#
# Functions/Macros
# ---------------------------------------------------------------------------
#
# * Use px4_parse_function_args to parse functions and check for required
#   arguments. Unless there is only one argument in the function and it is clear.
#
# * Never use macros. They allow overwriting global variables and this
#	makes variable declarations hard to locate.
#
# * If a target from add_custom_* is set in a function, explicitly pass it
#	as an output argument so that the target name is clear to the user.
#
# * Avoid use of global variables in functions. Functions in a nested
#	scope may use global variables, but this makes it difficult to
#	reuse functions.
#
# Included CMake Files
# ---------------------------------------------------------------------------
#
# * All variables in config files must have the prefix "config_".
#
# * Never set global variables in an included cmake file,
#	you may only define functions. This excludes config and Toolchain files.
#	This makes it clear to the user when variables are being set or targets
#	are being created.
#
# * Setting a global variable in a CMakeLists.txt file is ok, because
#	each CMakeLists.txt file has scope in the current directory and all
#	subdirectories, so it is not truly global.
#
# * All toolchain files should be included in the cmake
#	directory and named Toolchain-"name".cmake.
#
# Misc
# ---------------------------------------------------------------------------
#
# * If referencing a string variable, don't put it in quotes.
#	Don't do "${PX4_PLATFORM}" STREQUAL "posix",
#	instead type ${PX4_PLATFORM} STREQUAL "posix". This will throw an
#	error when ${PX4_PLATFORM} is not defined instead of silently
#	evaluating to false.
#
#=============================================================================

cmake_minimum_required(VERSION 3.2 FATAL_ERROR)

set(PX4_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
set(PX4_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")
# 将Firmware/cmake目录添加到该变量中，使其中的.cmake module可以被使用
list(APPEND CMAKE_MODULE_PATH ${PX4_SOURCE_DIR}/cmake)
include(px4_parse_function_args)

#=============================================================================
# git
#
include(px4_git)

# 用于显示当前固件的git版本
execute_process(
	COMMAND git describe --always --tags
	OUTPUT_VARIABLE PX4_GIT_TAG
	OUTPUT_STRIP_TRAILING_WHITESPACE
	WORKING_DIRECTORY ${PX4_SOURCE_DIR}
	)
message(STATUS "PX4 version: ${PX4_GIT_TAG}")

define_property(GLOBAL PROPERTY PX4_MODULE_LIBRARIES
                 BRIEF_DOCS "PX4 module libs"
                 FULL_DOCS "List of all PX4 module libraries"
                 )

define_property(GLOBAL PROPERTY PX4_MODULE_PATHS
                 BRIEF_DOCS "PX4 module paths"
                 FULL_DOCS "List of paths to all PX4 modules"
                 )

#=============================================================================
# configuration
#

set(CONFIG "px4_sitl_default" CACHE STRING "desired configuration")
#function(px4_add_module) 会被Firmware/src目录下的各个module目录里的CMakeLists.txt调用，用于子模块的CMake文件格式化编写
include(px4_add_module)
set(config_module_list)
set(config_df_driver_list)
#用于找到/boards/px4/sitl中的.cmake文件，并将该文件路径赋给PX4_CONFIG_FILE变量
include(px4_config)
#function(px4_add_board)被Firmware/boards/px4/sitl中的*.cmake文件调用，用于确认该targe的编译需要哪些module参与，也就是src下的那些模块。
include(px4_add_board)
include(${PX4_CONFIG_FILE})
#/home/l/Firmware/boards/px4/sitl/default.cmake
message(STATUS "PX4 config: ${PX4_CONFIG}")
#posix
message(STATUS "PX4 platform: ${PX4_PLATFORM}")

if (ENABLE_LOCKSTEP_SCHEDULER)
	add_definitions(-DENABLE_LOCKSTEP_SCHEDULER)
	message(STATUS "PX4 lockstep: enabled")
else()
	message(STATUS "PX4 lockstep: disabled")
endif()

# external modules
set(EXTERNAL_MODULES_LOCATION "" CACHE STRING "External modules source location")

if (NOT EXTERNAL_MODULES_LOCATION STREQUAL "")
	get_filename_component(EXTERNAL_MODULES_LOCATION "${EXTERNAL_MODULES_LOCATION}" ABSOLUTE)
endif()

set_property(GLOBAL PROPERTY PX4_MODULE_CONFIG_FILES)

include(platforms/${PX4_PLATFORM}/cmake/px4_impl_os.cmake)
list(APPEND CMAKE_MODULE_PATH ${PX4_SOURCE_DIR}/platforms/${PX4_PLATFORM}/cmake)

if(EXISTS "${PX4_SOURCE_DIR}/platforms/${PX4_PLATFORM}/cmake/init.cmake")
	include(init)
endif()

# CMake build type (Debug Release RelWithDebInfo MinSizeRel Coverage)
if (NOT CMAKE_BUILD_TYPE)
	if (${PX4_PLATFORM} STREQUAL "nuttx")
		set(PX4_BUILD_TYPE "MinSizeRel")
	else()
		set(PX4_BUILD_TYPE "RelWithDebInfo")
	endif()

	set(CMAKE_BUILD_TYPE ${PX4_BUILD_TYPE} CACHE STRING "Build type" FORCE)
endif()

set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug;Release;RelWithDebInfo;MinSizeRel;Coverage;AddressSanitizer;UndefinedBehaviorSanitizer")
message(STATUS "cmake build type: ${CMAKE_BUILD_TYPE}")

#=============================================================================
# project definition
#
project(px4 CXX C ASM)

set(package-contact "px4users@googlegroups.com")

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# For the catkin build process, unset build of dynamically-linked binaries
# and do not change CMAKE_RUNTIME_OUTPUT_DIRECTORY
if (NOT CATKIN_DEVEL_PREFIX)
	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PX4_BINARY_DIR})
	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${PX4_BINARY_DIR})
	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${PX4_BINARY_DIR})
else()
	SET(BUILD_SHARED_LIBS OFF)
endif()

#=============================================================================

# gold linker - use if available
include(CMakeDependentOption)
CMAKE_DEPENDENT_OPTION(USE_LD_GOLD
                      "Use GNU gold linker" ON
                      "NOT WIN32;NOT APPLE" OFF
)

if(USE_LD_GOLD)
	execute_process(COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
	if("${LD_VERSION}" MATCHES "GNU gold")
		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=gold")
		set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fuse-ld=gold")
	else()
		set(USE_LD_GOLD OFF)
	endif()
endif()

#=============================================================================

# Setup install paths
if (${PX4_PLATFORM} STREQUAL "posix")

	# This makes it possible to dynamically load code which depends on symbols
	# inside the px4 executable.
	set(CMAKE_POSITION_INDEPENDENT_CODE ON)
	set(CMAKE_ENABLE_EXPORTS ON)
	# 用于确认posix环境下target安装的路径
	include(coverage)
	include(sanitizers)

	# Define GNU standard installation directories
	include(GNUInstallDirs)

	if (NOT CMAKE_INSTALL_PREFIX)
		set(CMAKE_INSTALL_PREFIX "/usr" CACHE PATH "Install path prefix" FORCE)
	endif()
endif()

include(ccache)

#=============================================================================
# find programs and packages
#

# see if catkin was invoked to build this
if (CATKIN_DEVEL_PREFIX)
	message(STATUS "catkin ENABLED")
	find_package(catkin REQUIRED)
	if (catkin_FOUND)
		catkin_package()
	else()
		message(FATAL_ERROR "catkin not found")
	endif()
endif()

# python
include(px4_find_python_module)
find_package(PythonInterp REQUIRED)

option(PYTHON_COVERAGE "Python code coverage" OFF)
if(PYTHON_COVERAGE)
	message(STATUS "python coverage enabled")
	set(PYTHON_EXECUTABLE coverage run -p)
else()
	# run normally (broken under coveragepy)
	px4_find_python_module(jinja2 REQUIRED)
endif()

#=============================================================================
# get chip and chip manufacturer
#
px4_os_determine_build_chip()
if(NOT PX4_CHIP_MANUFACTURER)
	message(FATAL_ERROR "px4_os_determine_build_chip() needs to set PX4_CHIP_MANUFACTURER")
endif()
if(NOT PX4_CHIP)
	message(FATAL_ERROR "px4_os_determine_build_chip() needs to set PX4_CHIP")
endif()

#=============================================================================
# build flags
#
include(px4_add_common_flags)
px4_add_common_flags()
px4_os_add_flags()

#=============================================================================
# message, and airframe generation
#
include(px4_metadata)

add_subdirectory(msg EXCLUDE_FROM_ALL)

px4_generate_airframes_xml(BOARD ${PX4_BOARD})

#=============================================================================
# DriverFramework
#
px4_add_git_submodule(TARGET git_driverframework PATH "src/lib/DriverFramework")
set(OS ${PX4_PLATFORM})
add_subdirectory(src/lib/DriverFramework/framework)

# List the DriverFramework drivers
if (DEFINED config_df_driver_list)
	message("DF Drivers: ${config_df_driver_list}")
endif()

set(df_driver_libs)
foreach(driver ${config_df_driver_list})
	add_subdirectory(src/lib/DriverFramework/drivers/${driver})
	list(APPEND df_driver_libs df_${driver})
	message("Adding DF driver: ${driver}")
endforeach()

#=============================================================================
# external projects
#
set(ep_base ${PX4_BINARY_DIR}/external)
set_property(DIRECTORY PROPERTY EP_BASE ${ep_base})

# add external project install folders to build
link_directories(${ep_base}/Install/lib)
include_directories(${ep_base}/Install/include)
# add the directories so cmake won't warn
execute_process(COMMAND cmake -E make_directory ${ep_base}/Install/lib)
execute_process(COMMAND cmake -E make_directory ${ep_base}/Install/include)

#=============================================================================
# external modules
#
set(external_module_paths)
if (NOT EXTERNAL_MODULES_LOCATION STREQUAL "")
	message(STATUS "External modules: ${EXTERNAL_MODULES_LOCATION}")
	add_subdirectory("${EXTERNAL_MODULES_LOCATION}/src" external_modules)

	foreach(external_module ${config_module_list_external})
		add_subdirectory(${EXTERNAL_MODULES_LOCATION}/src/${external_module} external_modules/${external_module})
		list(APPEND external_module_paths ${EXTERNAL_MODULES_LOCATION}/src/${external_module})
	endforeach()
endif()

#=============================================================================
# Testing - Automatic unit and integration testing with CTest
#

# optionally enable cmake testing (supported only on posix)
option(CMAKE_TESTING "Configure test targets" OFF)
if (${PX4_CONFIG} STREQUAL "px4_sitl_test")
	set(CMAKE_TESTING ON)
endif()
if(CMAKE_TESTING)
	include(CTest) # sets BUILD_TESTING variable
endif()

# enable test filtering to run only specific tests with the ctest -R regex functionality
set(TESTFILTER "" CACHE STRING "Filter string for ctest to selectively only run specific tests (ctest -R)")

# if testing is enabled download and configure gtest
list(APPEND CMAKE_MODULE_PATH ${PX4_SOURCE_DIR}/cmake/gtest/)
include(px4_add_gtest)
if(BUILD_TESTING)
	include(gtest)
endif()

add_custom_target(test_results
		COMMAND GTEST_COLOR=1 ${CMAKE_CTEST_COMMAND} --output-on-failure -T Test -R ${TESTFILTER} USES_TERMINAL
		DEPENDS
			px4
			examples__dyn_hello
			test_mixer_multirotor
		USES_TERMINAL
		COMMENT "Running tests"
		WORKING_DIRECTORY ${PX4_BINARY_DIR})
set_target_properties(test_results PROPERTIES EXCLUDE_FROM_ALL TRUE)

#=============================================================================
# subdirectories
#
add_library(parameters_interface INTERFACE)

include(px4_add_library)
add_subdirectory(src/lib EXCLUDE_FROM_ALL)
# 用于知道chip信息
add_subdirectory(platforms/${PX4_PLATFORM}/src/px4)
# EXCLUDE_FROM_ALL用于排除发行版不想包含进去的源代码，在只使用cmake命令时不会包含进去。
add_subdirectory(platforms EXCLUDE_FROM_ALL)
add_subdirectory(src/modules/uORB EXCLUDE_FROM_ALL) # TODO: platform layer
add_subdirectory(src/drivers/boards EXCLUDE_FROM_ALL)

if(EXISTS "${PX4_BOARD_DIR}/CMakeLists.txt")
	add_subdirectory(${PX4_BOARD_DIR})
endif()
#将config_module_list中的每一个module目录使用add_subdirectory进行识别包含
foreach(module ${config_module_list})
	add_subdirectory(src/${module})
endforeach()

# must be the last module before firmware
add_subdirectory(src/lib/parameters EXCLUDE_FROM_ALL)
target_link_libraries(parameters_interface INTERFACE parameters)

# firmware added last to generate the builtin for included modules
add_subdirectory(platforms/${PX4_PLATFORM})

#=============================================================================
# uORB graph generation: add a custom target 'uorb_graph'
#
set(uorb_graph_config ${PX4_BOARD})

set(graph_module_list "")
foreach(module ${config_module_list})
	set(graph_module_list "${graph_module_list}" "--src-path" "src/${module}")
endforeach()

add_custom_command(OUTPUT ${uorb_graph_config}
	COMMAND ${PYTHON_EXECUTABLE} ${PX4_SOURCE_DIR}/Tools/uorb_graph/create.py
		${module_list}
		--exclude-path src/examples
		--file ${PX4_SOURCE_DIR}/Tools/uorb_graph/graph_${uorb_graph_config}
	WORKING_DIRECTORY ${PX4_SOURCE_DIR}
	COMMENT "Generating uORB graph"
)
add_custom_target(uorb_graph DEPENDS ${uorb_graph_config})


include(doxygen)
include(metadata)
include(package)

# print size
add_custom_target(size
	COMMAND size $<TARGET_FILE:px4>
	DEPENDS px4
	WORKING_DIRECTORY ${PX4_BINARY_DIR}
	USES_TERMINAL
	)