SqMod/CMakeLists.txt

cmake_minimum_required(VERSION 3.7)
project(SqMod)

# Tell CMake where to find our scripts
set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/vendor/POCO/cmake)

# Several plugin options
option(ENABLE_API21 "Build for 2.1 API." OFF)
option(FORCE_32BIT_BIN "Create a 32-bit executable binary if the compiler defaults to 64-bit." OFF)
# This option should only be available in certain conditions
if(WIN32 AND MINGW)
	option(COPY_DEPENDENCIES "Copy deppendent DLLs into the deps folder." OFF)
endif()

include(CheckCXXCompilerFlag)
# C++ standard availability check
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
	check_cxx_compiler_flag(-std=c++20 HAVE_FLAG_STD_CXX20)
	check_cxx_compiler_flag(-std=c++2a HAVE_FLAG_STD_CXX2A)
	if(HAVE_FLAG_STD_CXX20 OR HAVE_FLAG_STD_CXX2A)
		# We can use C++20
	    set(CPP_STD_NUMBER 20)
	    # Specific flags
	    if (HAVE_FLAG_STD_CXX2A AND NOT HAVE_FLAG_STD_CXX20)
		    set(CPP_STD_COMPILER_FLAG "-std=c++20")
	    else()
		    set(CPP_STD_COMPILER_FLAG "-std=c++2a")
	    endif()
		# Need these workarounds for older CMake
		if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
			if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0)
				set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std=c++20")
				set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++20")
			elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
				set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std=c++2a")
				set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
			endif()
		endif()
	else()
		check_cxx_compiler_flag(-std=c++17 HAVE_FLAG_STD_CXX17)
		check_cxx_compiler_flag(-std=c++1z HAVE_FLAG_STD_CXX1Z)
	    if(HAVE_FLAG_STD_CXX17 OR HAVE_FLAG_STD_CXX1Z)
			# We can use C++17
			set(CPP_STD_NUMBER 17)
		    # Specific flags
		    if (HAVE_FLAG_STD_CXX17 AND NOT HAVE_FLAG_STD_CXX1Z)
			    set(CPP_STD_COMPILER_FLAG "-std=c++17")
		    else()
			    set(CPP_STD_COMPILER_FLAG "-std=c++1z")
		    endif()
			# Need these workarounds for older CMake
			if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
				if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
					set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std=c++17")
					set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
				elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
					set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std=c++1z")
					set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
				endif()
			endif()
	    else()
			# C++14 is mandatory
			set(CPP_STD_NUMBER 14)
		    # Specific flags
			set(CPP_STD_COMPILER_FLAG "-std=c++14")
	    endif()
	endif()
else()
	# C++14 is mandatory
	set(CPP_STD_NUMBER 14)
endif()

message(STATUS "SqMod: Using C++${CPP_STD_NUMBER} standard.")

# Default to the identified standard
if(CMAKE_VERSION VERSION_LESS "3.1")
	if(${CMAKE_CXX_COMPILER_ID} MATCHES "(GNU)+")
		set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CPP_STD_COMPILER_FLAG}")
	endif()
else()
	# Apparently the above does not work with cmake from on debian 8
	if(${CMAKE_CXX_COMPILER_ID} MATCHES "(GNU)+")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CPP_STD_COMPILER_FLAG}")
	endif()
	# F* you too Debian. What can I say.
	if(CMAKE_VERSION VERSION_LESS "3.8.0" AND CPP_STD_NUMBER LESS 17)
		# Try the standard method as well
		set(CMAKE_CXX_STANDARD ${CPP_STD_NUMBER})
		set(CMAKE_CXX_STANDARD_REQUIRED ON)
	endif()
endif()

# Determine if build mode
if(${CMAKE_BUILD_TYPE} MATCHES "(Debug)+")
	add_compile_options(-g)
endif()

# Enable position independent code
if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
	set(CMAKE_POSITION_INDEPENDENT_CODE ON)
endif()

# Include vendor libraries
add_subdirectory(vendor)
# Include Module library
add_subdirectory(module)