CMakeLists.txt

cmake_minimum_required(VERSION 3.16)
cmake_policy(SET CMP0060 OLD) #causes link errors on Linux otherwise
cmake_policy(SET CMP0065 OLD) #we need binaries compiled with -rdynamic for BARb to work (cause unknown https://github.com/beyond-all-reason/spring/issues/405)

set(CMAKE_MODULES_SPRING "${CMAKE_CURRENT_SOURCE_DIR}/rts/build/cmake")
list(APPEND CMAKE_MODULE_PATH "${CMAKE_MODULES_SPRING}")

# enable flag overrides for compilers
set(CMAKE_USER_MAKE_RULES_OVERRIDE "${CMAKE_MODULES_SPRING}/OverrideFlags.cmake")

project(Spring)

add_definitions(-DFMT_HEADER_ONLY) #for fmt lib

option(INSTALL_PORTABLE "Make a portable installation (instead of regular system installation)" FALSE)
option(WITH_MAPCOMPILER "Include map compiler" TRUE)

# dummy so that qtcreator shows all files (even those of windows)
if(CMAKE_VERSION VERSION_GREATER 3.1.2)
	add_library(platform_sources EXCLUDE_FROM_ALL "")
endif()

# includes rts/build/cmake/Util.cmake & rts/build/cmake/PreferStaticLibs.cmake
include(Util)
include(PreferStaticLibs)

# check for minimal gcc version
set(MIN_GCC_VER "7.0")
if(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
	if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "${MIN_GCC_VER}")
		message(FATAL_ERROR "gcc >=${MIN_GCC_VER} required")
	else()
		message(STATUS "gcc ${CMAKE_CXX_COMPILER_VERSION} detected")
	endif()
endif()

# set some internal vars

if (NOT "${CMAKE_C_FLAGS}" STREQUAL "")
	message(WARNING "Using custom C_FLAGS: ${CMAKE_C_FLAGS} this build will very likely not sync in online mode!")
endif()

if (NOT "${CMAKE_CXX_FLAGS}" STREQUAL "")
	message(WARNING "Using custom CXX_FLAGS: ${CMAKE_CXX_FLAGS} this build will very likely not sync in online mode!")
endif()

set (CUSTOM_COMPILER_DEFINITIONS "" CACHE STRING "Custom flags can be defined here")
if    (CUSTOM_COMPILER_DEFINITIONS)
	add_definitions(${CUSTOM_COMPILER_DEFINITIONS})
endif (CUSTOM_COMPILER_DEFINITIONS)


### set the default build type
if    (NOT CMAKE_BUILD_TYPE)
	set(CMAKE_BUILD_TYPE RELWITHDEBINFO CACHE STRING
		"Choose the type of build, options are: RELWITHDEBINFO DEBUG RELEASE PROFILE"
		FORCE)
endif (NOT CMAKE_BUILD_TYPE)

string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UPPER)
if(${CMAKE_BUILD_TYPE_UPPER} MATCHES "^DEBUG")
	set(DEBUG_BUILD TRUE)
else()
	set(DEBUG_BUILD FALSE)
endif()

if(DEBUG_BUILD)
	set(JAVA_COMPILE_FLAG_CONDITIONAL "-g:lines,source,vars")
else()
	set(JAVA_COMPILE_FLAG_CONDITIONAL "-g:lines,source")
endif()


# Tell windows to pass arguments around in @response files
# (32k arg limit workaround)
if    (WIN32)
	set(CMAKE_C_USE_RESPONSE_FILE_FOR_OBJECTS 1)
	set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS 1)
endif (WIN32)


# XCode
if    (APPLE)
	option(MACOSX_BUNDLE "Compile spring to work as a Bundle.app" TRUE)
	add_definitions(${PIC_FLAG})
	if    (MACOSX_BUNDLE)
		add_definitions(-DMACOSX_BUNDLE)
	endif (MACOSX_BUNDLE)
else  (APPLE)
	set(MACOSX_BUNDLE FALSE)
endif (APPLE)

### Compiler flags and defines based on build type
include(TestCXXFlags)

## 32bit or 64bit?
set(MARCH_FLAG ${MARCH} CACHE STRING "CPU optimization (use `generic` for generic optimization)")
if    (CMAKE_SIZEOF_VOID_P EQUAL 8)
	set(MARCH_BITS 64 CACHE INTERNAL "" FORCE)
else  (CMAKE_SIZEOF_VOID_P EQUAL 8)
	set(MARCH_BITS 32 CACHE INTERNAL "" FORCE)
endif (CMAKE_SIZEOF_VOID_P EQUAL 8)

message(STATUS "Building Spring on ${MARCH_BITS}bit environment")
set(BUILD_BITS "${MARCH_BITS}" CACHE STRING "Target arch machine type")
message(STATUS "Targetting ${BUILD_BITS}bit")


### Install paths (relative to CMAKE_INSTALL_PREFIX)
if    (UNIX AND NOT MINGW)
	set(BINDIR  "bin"                CACHE STRING "Where to install binaries")
	set(LIBDIR  "lib"                CACHE STRING "Where to install libraries")
	set(MANDIR  "share/man"          CACHE STRING "Where to install man pages")
	set(DOCDIR  "share/doc/spring-VERSION" CACHE STRING "Where to install basic project documentation (README, LICENSE, etc.)") # TODO set correct version here, and re-enable userdocs in doc/CMakeLists.txt
	set(DATADIR "share/games/spring" CACHE STRING "Where to install game content")

	set(APPLICATIONS_DIR "share/applications" CACHE STRING "Where to install desktop files")
	set(PIXMAPS_DIR      "share/pixmaps"      CACHE STRING "Where to install icons")
	set(MIME_DIR         "share/mime"         CACHE STRING "Where MIME definitions are located")
else  (UNIX AND NOT MINGW)
	set(BINDIR  "." CACHE STRING "Where to install binaries")
	set(LIBDIR  "." CACHE STRING "Where to install libraries")
	set(DOCDIR  "doc" CACHE STRING "Where to install basic project documentation (README, LICENSE, etc.)")
	set(DATADIR "." CACHE STRING "Where to install game content")

	if    (NOT MINGWLIBS)
		if(MSVC)
			if(BUILD_BITS EQUAL 32)
				set(MINGWLIBS ${CMAKE_SOURCE_DIR}/vclibs CACHE PATH "Location of the vclibs package")
			else(BUILD_BITS EQUAL 32)
				set(MINGWLIBS ${CMAKE_SOURCE_DIR}/vclibs64 CACHE PATH "Location of the vclibs package")
			endif(BUILD_BITS EQUAL 32)
		else(MSVC)
			if(BUILD_BITS EQUAL 32)
				set(MINGWLIBS ${CMAKE_SOURCE_DIR}/mingwlibs CACHE PATH "Location of the mingwlibs package")
			else(BUILD_BITS EQUAL 32)
				set(MINGWLIBS ${CMAKE_SOURCE_DIR}/mingwlibs64 CACHE PATH "Location of the mingwlibs package")
			endif(BUILD_BITS EQUAL 32)
		endif(MSVC)
	endif ()
	if    (EXISTS "${MINGWLIBS}" AND IS_DIRECTORY "${MINGWLIBS}")
		if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
			#rectifying dll search issue present in CMake >= 3.17.0, see https://discourse.cmake.org/t/findzlib-fails-starting-with-cmake-3-17/6046/4
			set(CMAKE_FIND_LIBRARY_SUFFIXES ".dll" ${CMAKE_FIND_LIBRARY_SUFFIXES})
		endif()

		# MinGW needs an additional library, mwindows
		# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows
		# (Actually on second look, I think it only needs one of the m* libraries.)
		if(NOT MSVC)
			set(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
		endif(NOT MSVC)
		set(SDL2_INCLUDE_DIR "${MINGWLIBS}/include/SDL2")
		set(CMAKE_PREFIX_PATH ${MINGWLIBS})
		include_directories(${MINGWLIBS}/include)
		set(CMAKE_LIBRARY_PATH ${MINGWLIBS}/dll ${MINGWLIBS}/lib)

		# some cross-compile fixes
		set(CMAKE_FIND_ROOT_PATH ${MINGWLIBS} ${CMAKE_FIND_ROOT_PATH})
		set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
		set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
	else()
		message(WARNING "Compiling for windows. MINGWLIBS '${MINGWLIBS}' is not a valid directory, trying system libs")
	endif ()


	add_definitions(-D_WIN32_WINNT=0x0601) ## Win7 is minimum due to cpuid processor group affinity
	add_definitions(-D__USE_MINGW_ANSI_STDIO=1) ## use __mingw_sprintf instead of __builtin_sprintf (it's used by lua in a synced way, and builtin doesn't sync)

	if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
		add_definitions(-DWIN32)
	endif()

	if(MSVC)
		set (CMAKE_VS_JUST_MY_CODE_DEBUGGING 1)
		add_definitions(-D_ENABLE_EXTENDED_ALIGNED_STORAGE)
		add_definitions(-DNOMINMAX -DWIN32_LEAN_AND_MEAN)
		set(GLEW_STATIC ON)
		#set(EXE_FLAGS WIN32)
	endif()
endif (UNIX AND NOT MINGW)

## Artificial Intelligence
# In theory, it should be possible to set this to LIBDIR instead
# (next two are relative to CMAKE_INSTALL_PREFIX)
set(AI_LIBS_DIR "${DATADIR}"     CACHE STRING "Where to install Skirmish AI libraries")
set(AI_DATA_DIR "${AI_LIBS_DIR}" CACHE STRING "Where to install Skirmish AI additional files (eg. configuration)")
set(AI_TYPES    "NATIVE"            CACHE STRING "Which AI Interfaces (and Skirmish AIs using them) to build [ALL|NATIVE|JAVA|NONE]")

## DataDirs
set(BUILTIN_DATADIRS "")
if    (NOT WIN32 AND NOT MACOSX_BUNDLE)
	set(SPRING_DATADIR CACHE STRING "Path to game content (in addition to /etc/spring/datadir)")
	set(SPRING_DATADIR_INTERNAL "")
	if    (SPRING_DATADIR)
		set(SPRING_DATADIR_INTERNAL "${SPRING_DATADIR}${PATH_DELIM_T}")
	endif (SPRING_DATADIR)
	if    (CMAKE_INSTALL_PREFIX)
		set(SPRING_DATADIR_INTERNAL "${SPRING_DATADIR_INTERNAL}${CMAKE_INSTALL_PREFIX}${PATH_SEP_T}${DATADIR}")
	endif (CMAKE_INSTALL_PREFIX)
	set(BUILTIN_DATADIRS "${SPRING_DATADIR_INTERNAL}")
endif (NOT WIN32 AND NOT MACOSX_BUNDLE)
if    (NOT "${AI_LIBS_DIR}" STREQUAL "${DATADIR}")
	# If the AI library dir is not the same as the normal data dir,
	# add it to the internal list of data dirs
	set(BUILTIN_DATADIRS "${BUILTIN_DATADIRS}${PATH_DELIM_T}${CMAKE_INSTALL_PREFIX}${PATH_SEP_T}${AI_LIBS_DIR}")
endif (NOT "${AI_LIBS_DIR}" STREQUAL "${DATADIR}")
if    (NOT "${AI_DATA_DIR}" STREQUAL "${DATADIR}" AND NOT "${AI_DATA_DIR}" STREQUAL "${AI_LIBS_DIR}")
	# If the AI data dir is not the same as the normal data dir
	# nor the AI library dir, add it to the internal list of data dirs
	set(BUILTIN_DATADIRS "${BUILTIN_DATADIRS}${PATH_DELIM_T}${CMAKE_INSTALL_PREFIX}${PATH_SEP_T}${AI_DATA_DIR}")
endif (NOT "${AI_DATA_DIR}" STREQUAL "${DATADIR}" AND NOT "${AI_DATA_DIR}" STREQUAL "${AI_LIBS_DIR}")
add_definitions(-DSPRING_DATADIR="${BUILTIN_DATADIRS}")



# Spring Related USE-Flags
set(LOG_LEVEL "DEFAULT" CACHE STRING
		"The minimum log level.
		Log messages below this level
		will not be compiled into the binary.
		Available levels:
		* DEFAULT (DEBUG on debug builds, INFO on release builds)
		* DEBUG (log everything)
		* INFO
		* WARNING (only use this if you know what you are doing!)")
if    (NOT "${LOG_LEVEL}" STREQUAL "DEFAULT")
	add_definitions(-D_LOG_LEVEL_MIN=LOG_LEVEL_${LOG_LEVEL})
endif (NOT "${LOG_LEVEL}" STREQUAL "DEFAULT")

option(SYNCCHECK "Check sync during gameplay (Required for online play!)" TRUE)
if    (SYNCCHECK)
	add_definitions(-DSYNCCHECK)
endif (SYNCCHECK)

option(NO_CREG "Disable creg support" FALSE)
if    (NO_CREG)
	add_definitions(-DNOT_USING_CREG)
endif (NO_CREG)

option(NO_SOUND "No sound output support" FALSE)

if    (WIN32)
	## internal AVI recorder (w/o sound atm)
	option(NO_AVI "Disable in-game video recording" FALSE)
	if    (NOT NO_AVI)
		add_definitions(-DAVI_CAPTURING)
	endif (NOT NO_AVI)

	if   (NOT MSVC)
		## stdout console
		option(WINDOWS_CONSOLE "Show a visible cmd.exe with stdout when spring runs" FALSE)
		if    (NOT WINDOWS_CONSOLE)
			set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -mwindows")
		endif (NOT WINDOWS_CONSOLE)
	endif(NOT MSVC)
endif (WIN32)

option(USE_ASAN "Build/link with address sanitizer enabled (for DEBUG builds only)" FALSE)
if    (USE_ASAN)
	if (UNIX AND NOT MINGW)
		add_compile_options("$<$<CONFIG:DEBUG>:-fsanitize=address>")
		add_link_options("$<$<CONFIG:DEBUG>:-fsanitize=address>")
	endif (UNIX AND NOT MINGW)
	if (MSVC)
		add_compile_options("$<$<CONFIG:DEBUG>:/fsanitize=address>")
	endif (MSVC)
endif (USE_ASAN)

### Tracy related stuff
option(RECOIL_DETAILED_TRACY_ZONING "Enable additional detailed tracy zones (only enable this for testing/debugging)" FALSE)
if    (RECOIL_DETAILED_TRACY_ZONING)
	add_definitions(-DRECOIL_DETAILED_TRACY_ZONING)
else  (RECOIL_DETAILED_TRACY_ZONING)
	remove_definitions(-DRECOIL_DETAILED_TRACY_ZONING)
endif (RECOIL_DETAILED_TRACY_ZONING)

# Note the missing REQUIRED, as headless & dedi may not depend on those.
#  So req. checks are done in the build target's CMakeLists.txt.
find_package(SDL2)

find_package_static(DevIL)
if    (PREFER_STATIC_LIBS)
	# dependencies of DevIL
	find_package_static(JPEG REQUIRED)
	find_package_static(PNG REQUIRED)
	find_package_static(TIFF REQUIRED)
	find_package_static(GIF REQUIRED)
endif (PREFER_STATIC_LIBS)

if    (WIN32)
	find_package(Windres REQUIRED)
	set(CMAKE_RC_COMPILER ${WINDRES_BIN})
	find_package(Win32Libs REQUIRED)
endif (WIN32)

if     (WIN32)
	set(CMAKE_SHARED_LIBRARY_PREFIX "")
	set(CMAKE_SHARED_MODULE_PREFIX "")
elseif (UNIX)
	# unix specifics
else   (UNIX)
	# mac
	find_library(COREFOUNDATION_LIBRARY CoreFoundation)
	include_directories("${COREFOUNDATION_LIBRARY}/Headers")
endif  (WIN32)

find_package(Valgrind)
if    (VALGRIND_FOUND)
	add_definitions(-DUSE_VALGRIND)
endif (VALGRIND_FOUND)

include (CheckSymbolExists)
check_symbol_exists(strnlen string.h HAVE_STRNLEN)
if (NOT HAVE_STRNLEN)
	message(FATAL_ERROR "this compiler/environment isn't supported, the function strnlen is missing!")
endif()

### Add Link-Time-Optimization flags, if supported (GCC >= 4.5) and enabled
option(LTO "Link Time Optimizations (LTO)" FALSE)
if    (LTO)
	if    (NOT LTO_FLAGS)
		message(WARNING "Tried to enable LTO, but compiler doesn't support it!")
	endif (NOT LTO_FLAGS)
	set(CMAKE_CXX_FLAGS           "${CMAKE_CXX_FLAGS}           ${LTO_FLAGS}")
	set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    ${LTO_FLAGS}")
	set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${LTO_FLAGS}")
endif (LTO)


### Memory Access Protection (BoundsChecking)
option(DEBUG_BOUNDSCHECK "Array/Pointer BoundsChecking a.k.a. buffer overflow protection (debug)" FALSE)
if    (DEBUG_BOUNDSCHECK)
	if    (NOT MPX_FLAGS)
		message(WARNING "Tried to enable BoundsCheck, but compiler doesn't support it!")
	endif (NOT MPX_FLAGS)
	set(CMAKE_CXX_FLAGS           "${CMAKE_CXX_FLAGS}           ${MPX_FLAGS}")
	set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    ${MPX_FLAGS}")
	set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${MPX_FLAGS}")
endif (DEBUG_BOUNDSCHECK)


### ld.gold
option(COMPRESS_DEBUG_SYMBOLS "Compresses the DebugSymbols (needs ld.gold, beware: slow)" FALSE)
if    (LDGOLD_FOUND)
	message(STATUS "Found ld.gold")
	if    (COMPRESS_DEBUG_SYMBOLS)
		message(STATUS "Compressing debug symbols")
		set(LDGOLD_LINKER_FLAGS " -Wl,--compress-debug-sections=zlib ${LDGOLD_LINKER_FLAGS}")
	endif (COMPRESS_DEBUG_SYMBOLS)

	set(CMAKE_LINKER LD_GOLD)
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LDGOLD_CXX_FLAGS}")
	set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${LDGOLD_LINKER_FLAGS}")
else  (LDGOLD_FOUND)
	message(WARNING "You are using ld.bfd, it's much slower than ld.gold.")
endif (LDGOLD_FOUND)

message(STATUS "Compiling with C++20")
if(MSVC)
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++20 /permissive- /Zc:__cplusplus")
else (MSVC)
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
endif(MSVC)

add_definitions(-D_GLIBCXX_USE_NANOSLEEP) # issue in std::chrono with gentoo and few other distros


### our custom OpenMP replacement
option(THREADPOOL "Enable ThreadPools" TRUE)
if (THREADPOOL)
	add_definitions(-DTHREADPOOL)
endif(THREADPOOL)


### warnings
if(NOT MSVC)
	### SigNan
	option(DEBUG_SIGNAL_NANS "Enable NaN-Signaling" ${DEBUG_BUILD})
	if (DEBUG_SIGNAL_NANS AND CMAKE_COMPILER_IS_GNUCXX)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsignaling-nans")
	endif()


	### CompileTime Warnings
	set(COMMON_WARNINGS "${COMMON_WARNINGS} -Wformat -Wformat-security")

	option(DEBUG_MAX_WARNINGS "Enable verbose compile" ${DEBUG_BUILD})
	if    (DEBUG_MAX_WARNINGS)
		# This would produce the maximum on warnings
		set(DEBUG_WARNINGS "-Wall -Wconversion ${COMMON_WARNINGS}")
	else  (DEBUG_MAX_WARNINGS)
		# This should produce a sane amount of warnings
		set(DEBUG_WARNINGS "-Wall -Wno-sign-compare ${COMMON_WARNINGS}")
	endif (DEBUG_MAX_WARNINGS)
endif(NOT MSVC)


if(DEBUG_BUILD)
        set(DEBUG_LUANAN_DEFAULT TRUE)
else()
        set(DEBUG_LUANAN_DEFAULT FALSE)
endif()

option(DEBUG_LUANAN "check for nans in lua" ${DEBUG_LUANAN_DEFAULT})
if(DEBUG_LUANAN)
        add_definitions(-DDEBUG_LUANAN)
endif()



### streflop
option(ENABLE_STREFLOP "build Spring with streflop support (REQUIRED FOR MULTIPLAYER)" TRUE)

if (ENABLE_STREFLOP)
## note: is removed in ./AI/CMakeLists.txt since it would break AI compilation
add_definitions(-DSTREFLOP_SSE)
else ()
add_definitions(-DNOT_USING_STREFLOP)
endif ()

### Asio
add_definitions(-DASIO_STANDALONE)

### compiler specific flags
set(CXX_FLAGS_DEBUG_ADDITIONAL "")
if (CMAKE_COMPILER_IS_GNUCXX)
	if    (UNIX)
		check_and_add_flags(CMAKE_CXX_FLAGS "-fdiagnostics-color=auto")
	endif (UNIX)

	if (NOT MARCH_FLAG)
		set(MARCH_FLAG "generic")
	endif (NOT MARCH_FLAG)

	if (MARCH_FLAG STREQUAL "")
		set(MARCH_FLAG "generic")
	endif (MARCH_FLAG STREQUAL "")

	if (NOT MARCH_FLAG STREQUAL "generic")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=${MARCH_FLAG} -mtune=${MARCH_FLAG}") #march/mtune define SSE flags
	else (NOT MARCH_FLAG STREQUAL "generic")
		set(FALLBACK_SSE_FLAGS "-msse")
		#set(FALLBACK_SSE_FLAGS "${FALLBACK_SSE_FLAGS} -mmmx")

		# worth to test if sync
		#set(FALLBACK_SSE_FLAGS "${FALLBACK_SSE_FLAGS} -mpopcnt -mlzcnt -mabm")

		# disable rest
		#set(FALLBACK_SSE_FLAGS "${FALLBACK_SSE_FLAGS} -mno-3dnow") tests showed it might sync
		set(FALLBACK_SSE_FLAGS "${FALLBACK_SSE_FLAGS} -mno-sse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -mno-sse4 -mno-sse4a")
		set(FALLBACK_SSE_FLAGS "${FALLBACK_SSE_FLAGS} -mno-avx -mno-fma -mno-fma4 -mno-xop -mno-lwp")
		set(FALLBACK_SSE_FLAGS "${FALLBACK_SSE_FLAGS} -mno-avx2")

		if (MARCH_BITS EQUAL 64)
			set(FALLBACK_MARCH "x86-64")
		else (MARCH_BITS EQUAL 64)
			set(FALLBACK_MARCH "i686")
		endif (MARCH_BITS EQUAL 64)

		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=${FALLBACK_MARCH} -mtune=generic ${FALLBACK_SSE_FLAGS}")
	endif (NOT MARCH_FLAG STREQUAL "generic")

	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SSE_FLAGS} -mfpmath=sse") #SSE_FLAGS are now user input only
elseif (MSVC)
	set(MSVC_CXX_FLAGS "/arch:SSE2") #default, but still set explicitly
	# silence warnings
	add_definitions(-D_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS)
else   (MSVC)
	message(WARNING "unknown compiler")
endif (CMAKE_COMPILER_IS_GNUCXX)

set(CXX_DEBUG_DEFINES          "-DDEBUG -D_DEBUG -DNO_CATCH_EXCEPTIONS")
set(CXX_RELWITHDEBINFO_DEFINES "-DNDEBUG")
set(CXX_RELEASE_DEFINES        "-DNDEBUG")
set(CXX_PROFILE_DEFINES        "-DNDEBUG -DPROFILE")

#### build types
if    (MSVC)
	set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LARGEADDRESSAWARE")
	set(MSVC_CXX_FLAGS "${MSVC_CXX_FLAGS} /wd4146 /wd4711")

	set(CMAKE_CXX_FLAGS_DEBUG           "${CMAKE_CXX_FLAGS_DEBUG}                       /MP ${MSVC_CXX_FLAGS} ${CXX_DEBUG_DEFINES}")
	set(CMAKE_CXX_FLAGS_RELWITHDEBINFO  "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /O2 /Ob2 /GL /MP ${MSVC_CXX_FLAGS} ${CXX_RELWITHDEBINFO_DEFINES}")
	set(CMAKE_CXX_FLAGS_RELEASE         "${CMAKE_CXX_FLAGS_RELEASE}        /O2 /Ob2 /GL /MP ${MSVC_CXX_FLAGS} ${CXX_RELEASE_DEFINES}")
	set(CMAKE_CXX_FLAGS_PROFILE         "${CMAKE_CXX_FLAGS_PROFILE}        /O2 /Ob2 /GL /MP ${MSVC_CXX_FLAGS} ${CXX_PROFILE_DEFINES}")

	set(CMAKE_EXE_LINKER_FLAGS_RELEASE        "${CMAKE_EXE_LINKER_FLAGS_RELEASE}        /LTCG")
	set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /LTCG")
	set(CMAKE_CXX_FLAGS_PROFILE               "${CMAKE_CXX_FLAGS_PROFILE} /LTCG")
else  (MSVC)
	if (CMAKE_COMPILER_IS_GNUCXX)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsingle-precision-constant -frounding-math")
	endif(CMAKE_COMPILER_IS_GNUCXX)
	# Experiment with frame pointers to see whether it improves the quality of the stack unwinds.
	# We're having trouble getting meaningful information form crash reports. Trying this before
	# moving onto more performance-impacting methods.
	# set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer")
	# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-omit-frame-pointer")

	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${IEEE_FP_FLAG} -pipe -fno-strict-aliasing ${VISIBILITY_HIDDEN} ${VISIBILITY_INLINES_HIDDEN}")
	if (UNIX)
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
	endif (UNIX)
	if    (MINGW)
		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -mthreads")
	endif (MINGW)

	#set(CMAKE_CXX_FLAGS_DEBUG           "${CXX_FLAGS_DEBUG_ADDITIONAL} -O0     ${DEBUG_WARNINGS}  ${CXX_DEBUG_DEFINES}")
	#set(CMAKE_CXX_FLAGS_RELWITHDEBINFO  "${CXX_FLAGS_DEBUG_ADDITIONAL} -O2     ${COMMON_WARNINGS} ${CXX_RELWITHDEBINFO_DEFINES}")
	#set(CMAKE_CXX_FLAGS_RELEASE         "                              -O2     ${COMMON_WARNINGS} ${CXX_RELEASE_DEFINES}")
	#set(CMAKE_CXX_FLAGS_PROFILE         "                              -O2 -pg ${DEBUG_WARNINGS}  ${CXX_PROFILE_DEFINES}")

	#rely on cmake defaults
	set(CMAKE_CXX_FLAGS_DEBUG           "${CMAKE_CXX_FLAGS_DEBUG} ${DEBUG_WARNINGS}  ${CXX_DEBUG_DEFINES}")
	set(CMAKE_CXX_FLAGS_RELWITHDEBINFO  "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} ${COMMON_WARNINGS} ${CXX_RELWITHDEBINFO_DEFINES}")
	set(CMAKE_CXX_FLAGS_RELEASE         "${CMAKE_CXX_FLAGS_RELEASE} ${COMMON_WARNINGS} ${CXX_RELEASE_DEFINES}")
	set(CMAKE_CXX_FLAGS_PROFILE         "${CMAKE_CXX_FLAGS_PROFILE} ${DEBUG_WARNINGS}  ${CXX_PROFILE_DEFINES}")


	set(CMAKE_MODULE_LINKER_FLAGS_PROFILE "-pg")
	set(CMAKE_SHARED_LINKER_FLAGS_PROFILE "-pg")

	#set(CMAKE_CXX_FLAGS_DEBUG          "${CMAKE_CXX_FLAGS_DEBUG} -ggdb3") #cmake has -g it by default
	#set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -ggdb3") #cmake has -g it by default

	if (MARCH_BITS EQUAL 64 AND BUILD_BITS EQUAL 32)
		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
	endif (MARCH_BITS EQUAL 64 AND BUILD_BITS EQUAL 32)

	if     (MINGW)
		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static -static-libgcc -static-libstdc++ -Wl,--enable-auto-import")
		set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -static -static-libgcc -static-libstdc++ -Wl,--enable-auto-import")
		if    (BUILD_BITS EQUAL 32)
			# Increase memory limit from 2GB to 3GB on 32bit Windows and 2GB->4GB on 64bit Windows (assuming spring.exe is 32bit)
			# http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778(v=vs.85).aspx
			message(STATUS "Enable IMAGE_FILE_LARGE_ADDRESS_AWARE (>2GB memory limit)")
			set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--large-address-aware")
		else (BUILD_BITS EQUAL 32)
			message(WARNING "The 64bit version of spring on windows is experimental and may not sync with regular builds")
		endif (BUILD_BITS EQUAL 32)
	endif  (MINGW)
endif (MSVC)

message(STATUS "Using CMAKE_CXX_FLAGS:${CMAKE_CXX_FLAGS}")

if (CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")
	message (STATUS "Using CMAKE_CXX_FLAGS_RELWITHDEBINFO:${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
elseif (CMAKE_BUILD_TYPE STREQUAL "DEBUG")
	message (STATUS "Using CMAKE_CXX_FLAGS_DEBUG:${CMAKE_CXX_FLAGS_DEBUG}")
elseif (CMAKE_BUILD_TYPE STREQUAL "RELEASE")
	message (STATUS "Using CMAKE_CXX_FLAGS_RELEASE:${CMAKE_CXX_FLAGS_RELEASE}")
elseif (CMAKE_BUILD_TYPE STREQUAL "PROFILE")
	message (STATUS "Using CMAKE_CXX_FLAGS_PROFILE:${CMAKE_CXX_FLAGS_PROFILE}")
endif (CMAKE_BUILD_TYPE STREQUAL "RELWITHDEBINFO")


#######################################
# Source Files
#

# Sub-parts of the build system may add dependencies to this target
add_custom_target(generateSources)

# Make sure git is found if git is used
if   (EXISTS "${CMAKE_SOURCE_DIR}/.git")
	find_package(Git REQUIRED)
endif(EXISTS "${CMAKE_SOURCE_DIR}/.git")

# Generate the version files
set(VERSION_GENERATE_DIR "${CMAKE_BINARY_DIR}")

set(VERSION_GENERATE_SOURCES
		"${VERSION_GENERATE_DIR}/src-generated/engine/System/VersionGenerated.h"
		"${VERSION_GENERATE_DIR}/VERSION"
	)

set_source_files_properties(
	${VERSION_GENERATE_SOURCES}
	PROPERTIES GENERATED TRUE
)

# This is always executed (on every run of "make"),
# but the actual version files are only written in case of a change
# in the version info they use, or in the template file content.
if (MSVC)
	add_custom_command(
		OUTPUT ${VERSION_GENERATE_SOURCES}
		COMMAND "${CMAKE_COMMAND}"
			"-DSOURCE_ROOT=${CMAKE_SOURCE_DIR}"
			"-DCMAKE_MODULES_SPRING=${CMAKE_MODULES_SPRING}"
			"-DGENERATE_DIR=${VERSION_GENERATE_DIR}"
			"-DVERSION_ADDITIONAL=${VERSION_ADDITIONAL}"
			-P "${CMAKE_MODULES_SPRING}/ConfigureVersion.cmake"
			"${VERSION_GENERATE_DIR}"
		COMMENT
			"  Configuring Version files ..." VERBATIM
		)
	add_custom_target(generateVersionFiles DEPENDS ${VERSION_GENERATE_SOURCES})
else (MSVC)
	# This is always executed (on every run of "make"),
	# but the actual version files are only written in case of a change
	# in the version info they use, or in the template file content.
	add_custom_target(generateVersionFiles)
	add_custom_command(TARGET generateVersionFiles
		COMMAND "${CMAKE_COMMAND}"
			"-DSOURCE_ROOT=${CMAKE_SOURCE_DIR}"
			"-DCMAKE_MODULES_SPRING=${CMAKE_MODULES_SPRING}"
			"-DGENERATE_DIR=${VERSION_GENERATE_DIR}"
			"-DVERSION_ADDITIONAL=${VERSION_ADDITIONAL}"
			-P "${CMAKE_MODULES_SPRING}/ConfigureVersion.cmake"
			"${VERSION_GENERATE_DIR}"
		COMMENT
			"  Configuring Version files ..." VERBATIM
	)

endif (MSVC)

add_dependencies(generateSources generateVersionFiles)


### Where the other CMakeLists.txt are

# As the libs are required by all the other sub-projects, we add them first
add_subdirectory(rts/lib)

if    (NOT "${AI_TYPES}" STREQUAL "NONE")
	add_subdirectory(AI)
endif (NOT "${AI_TYPES}" STREQUAL "NONE")

# As tools/unitsync/ depends on sources from here, we add this one first
add_subdirectory(rts/System)

# additional tools
add_subdirectory(tools)

# user-docs
add_subdirectory(doc)

### Handle game content
### - Pack base-files
### - Install base-files
### - Install freedesktop stuff
### - Install mingw DLLs
add_subdirectory(cont)

# As rts/builds/* depends on most other stuff, we add this one as last
add_subdirectory(rts)

# Unit tests
# this has to be in root CMakeLists.txt
enable_testing()
add_subdirectory(test)

if (INSTALL_PORTABLE)
	install(DIRECTORY DESTINATION games)
	install(DIRECTORY DESTINATION maps)
	file(TOUCH ${CMAKE_CURRENT_BINARY_DIR}/springsettings_portable.cfg)  # empty settings file for portable install
	install(FILES ${CMAKE_CURRENT_BINARY_DIR}/springsettings_portable.cfg DESTINATION . RENAME springsettings.cfg)
endif (INSTALL_PORTABLE)