blame: CMakeLists.txt

# For target_compile_features

cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)

project(platform_folders VERSION 4.0.0 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(platform_folders

	sago/platform_folders.cpp

)

# Creates an alias so that people building in-tree (instead of using find_package)...

# can still link against the same target

add_library(sago::platform_folders ALIAS platform_folders)

# Defines standardized defaults for install paths

include(GNUInstallDirs)

# Where to search for the header while building

target_include_directories(platform_folders PUBLIC

	$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/sago>

	# Controls where #include <sago/platform_folders.h> starts to look from

	# So /usr/include/<sago/platform_folders.h>

	# or C:\Program Files\platform_folders\include\<sago/platform_folders.h>

	$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>

)

# Define the header as public for installation

set_target_properties(platform_folders PROPERTIES

	PUBLIC_HEADER "sago/platform_folders.h"

)

# cxx_std_11 requires v3.8

if(CMAKE_VERSION VERSION_LESS "3.8.0")

	# Use old method of forcing C++11

	set(CMAKE_CXX_STANDARD 11)

	set(CMAKE_CXX_STANDARD_REQUIRED true)

else()

	# Require (minimum) C++11 when using header

	# PRIVATE means only at compile time

	target_compile_features(platform_folders PUBLIC cxx_std_11)

endif()

# cxx_nullptr exists in v3.1

target_compile_features(platform_folders PRIVATE cxx_nullptr)

# Cmake's find_package search path is different based on the system

# See https://cmake.org/cmake/help/latest/command/find_package.html for the list

if(CMAKE_SYSTEM_NAME STREQUAL "Windows")

	# You can pass these when calling Cmake, so don't override if the user does

	if(NOT _WIN32_WINNT AND NOT WINVER)

		target_compile_definitions(platform_folders PRIVATE

			_WIN32_WINNT=0x0601

			WINVER=0x0601

		)

	endif()

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

	set(_PROJECT_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_PREFIX}/cmake")

else()

	# When calling find_package(<name>)

	# it looks for /usr/lib/cmake/<name>/<name>Config.cmake

	set(_PROJECT_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/platform_folders")

endif()

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

# and creates a .cmake file to be exported

install(TARGETS platform_folders

	EXPORT "platform_foldersConfig"

	LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"

	ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"

	# Tells it where to put the header files

	PUBLIC_HEADER DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/sago"

)

# "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 "platform_foldersConfig"

	NAMESPACE sago::

	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 platform_folders

	FILE "platform_folders-exports.cmake"

)

# For the config and configversion macros

include(CMakePackageConfigHelpers)

# 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}/platform_foldersConfigVersion.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}/platform_foldersConfigVersion.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)

	add_subdirectory(test)

	add_executable(platform_folders_sample platform_folders.cpp)

	target_link_libraries(platform_folders_sample PRIVATE platform_folders)

endif()