blame: CMakeLists.txt

cmake_minimum_required(VERSION 3.0.0 FATAL_ERROR)

project(platform_folders VERSION 3.2.0 LANGUAGES CXX)

# Since it's off, the library will be static by default

option(BUILD_SHARED_LIBS "Build shared instead of static." OFF)

add_library(${PROJECT_NAME}

	sago/platform_folders.cpp

)

# Where to search for the header

# The BUILD/INSTALL interface expressions are for exporting

target_include_directories(${PROJECT_NAME} PRIVATE

	$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/sago>

	$<INSTALL_INTERFACE:sago>

)

# Define the header as public for installation

set_target_properties(${PROJECT_NAME} PROPERTIES

	PUBLIC_HEADER "sago/platform_folders.h"

)

# Apple requires linking to CoreServices

# Check sys name instead of "APPLE" for cross-compilation

if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")

	# Find the framework

	# ref: https://developer.apple.com/library/content/documentation/MacOSX/Conceptual/OSX_Technology_Overview/SystemFrameworks/SystemFrameworks.html

	find_library(_CoreServices_FRAMEWORK

		NAMES "CoreServices.framework" "CoreServices"

		PATH_SUFFIXES "CoreServices"

		PATHS "/System/Library/Frameworks"

	)

	# Make sure it was found

	if(NOT _CoreServices_FRAMEWORK)

		message(FATAL_ERROR "Could not find the CoreServices framework!")

	endif()

	# Link to the CoreServices framework. This also sets the correct linking options

	# "If the library file is in a Mac OSX framework, the Headers directory of the framework will also be processed as a usage requirement."

	target_link_libraries(${PROJECT_NAME} PRIVATE "${_CoreServices_FRAMEWORK}")

endif()

# Defines standardized defaults for install paths

include(GNUInstallDirs)

# For the config and configversion macros

include(CMakePackageConfigHelpers)

# Controls what dir to prefix for the lib, so <sago/platform_folders.h>

set(_PROJECT_INSTALL_PREFIX_DIR "sago")

# Controls where the exports, config, and configversion files install to

set(_PROJECT_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_FULL_LIBDIR}/cmake/${_PROJECT_INSTALL_PREFIX_DIR}")

# Gives "Make install" esque operations a location to install to...

# and creates a .cmake file to be exported

install(TARGETS ${PROJECT_NAME}

	EXPORT "${PROJECT_NAME}-targets"

	LIBRARY DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/${_PROJECT_INSTALL_PREFIX_DIR}"

	ARCHIVE DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/${_PROJECT_INSTALL_PREFIX_DIR}"

	# Tells it where to put your headers if any set by set_target_properties

	PUBLIC_HEADER DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/${_PROJECT_INSTALL_PREFIX_DIR}"

	# Tells export where your includes folder is | Note that the private include path is not needed here

	INCLUDES DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}/${_PROJECT_INSTALL_PREFIX_DIR}"

)

# "The install(TARGETS) and install(EXPORT) commands work together to install a target and a file to help import it"

# Installs a cmake file which external projects can import.

install(EXPORT "${PROJECT_NAME}-targets"

	DESTINATION "${_PROJECT_INSTALL_CMAKE_DIR}"

)

# "The export command is used to generate a file exporting targets from a project build tree"

# Creates an import file for external projects which are aware of the build tree.

# May be useful for cross-compiling

export(TARGETS ${PROJECT_NAME}

	FILE "${PROJECT_NAME}-exports.cmake"

)

configure_package_config_file("${PROJECT_NAME}Config.cmake.in"

	"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"

	# Tells the config file where it will be installed, so it can be correctly imported

	INSTALL_DESTINATION "${_PROJECT_INSTALL_CMAKE_DIR}"

	# This passes the variables to the cmake.in file, which uses them

	PATH_VARS PROJECT_NAME

)

# Creates the project's ConfigVersion.cmake file

# This allows for find_package() to use a version in the call

write_basic_package_version_file("${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"

	# This'll require versioning in the project() call

	VERSION ${CMAKE_PROJECT_VERSION}

	# Just assuming Semver is followed

	COMPATIBILITY SameMajorVersion

)

# Install the ConfigVersion file, which is located in the build dir

install(FILES

		"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"

		"${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"

	DESTINATION "${_PROJECT_INSTALL_CMAKE_DIR}"

)

# A module for testing the library

include(CTest)

# BUILD_TESTING is defined (default ON) in CTest

if(BUILD_TESTING)

	set(_PROJECT_TEST_NAME "${PROJECT_NAME}_test")

	add_executable(${_PROJECT_TEST_NAME} platform_folders.cpp)

	target_link_libraries(${_PROJECT_TEST_NAME} PRIVATE ${PROJECT_NAME})

	# Since tests aren't installed, no reason to give it an INSTALL_INTERFACE

	target_include_directories(${_PROJECT_TEST_NAME} PRIVATE

		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/sago>

	)

	# Creates the "MyTest" test that runs the test executable created above

	# This is triggered by things like "make test"

	add_test(NAME MyTest COMMAND ${_PROJECT_TEST_NAME})

endif()